EF Johnson 2422001 User Manual

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VIKING® VX VHF LTR 25W-110W Repeater

Part No. 242-20X1-213

First Printing August 2000

PRELIMINARY

1-1

October 1995

Part No. 001-2008-202

October 1995 Part No. 001-2008-202

1-2

VIKING® VX

VHF LTR REPEATER

PART NO. 242-20X1-213

The E.F. Johnson Company designs and manufactures two-way radio equipment to serve a wide variety of communications needs. Johnson produces equipment for the mobile telephone and land mobile radio services which include business, industrial, government, public safety, and personal users.

LAND MOBILE PRODUCT WARRANTY

The manufacturer’s warranty statement for this product is available from your product supplier or from the E.F. Johnson Company, 299 Johnson Avenue, Box 1249, Waseca, MN 56093-0514. Phone (507) 835-6222.

WARNING

This device complies with Part 15 of the FCC rules. Operation is subject to the condition that this device does not cause harmful interference. In addition, changes or modification to this equipment not expressly approved by E. F. Johnson could void the user’s authority to operate this equipment (FCC rules, 47CFR Part 15.19).

DO NOT allow the antenna to touch or come in very close proximity with the eyes, face, or any exposed body parts while the radio is transmitting.

To comply with FCC RF exposure limits, DO NOT operate the transmitter of a stationary radio (base station or marine radio) when a person is within four (4) meters of the antenna.

DO NOT operate the radio in explosive or flammable atmospheres. The transmitted radio energy could trigger blasting caps or cause an explosion.

DO NOT operate the radio without the proper antenna installed.

DO NOT allow children to operate transmitter equipped radio equipment.

NOTE: The above warning list is not intended to include all hazards that may be encountered when using this radio.

SAFETY INFORMATION

The FCC has adopted a safety standard for human exposure to RF energy. Proper operation of this radio under normal conditions results in user exposure to RF energy below the Occupational Safety and Health Act and Federal Communi cat ion Commission limits.

The information in this document is subject to change without notice.

E.F. Johnson Company will not be liable for any misunderstanding due to misinformation or errors found in this document.

L TR, LTR-Net, Multi-Net, Viking Head/EFJohnson Logo, Call Guard and SUMMIT are registered trademarks of E.F . Johnson Company All other company and/or product names used in this manual are trademarks and/or registered trademarks of their respective manufacturer.

October 1995

1-3

Part No. 001-2008-202

FCC EXPOSURE LIMITS

This fixed station radio transceiver was tested by the manufacturer with an appropriate antenna in order to verify compliance with Maximum Permissible Exposure (MPE) limits set under Section 2.1091 of the FCC Rules and Regulations. The guidelines used in the evaluation are derived from T able 1 (B) titled “Limits For General Population/Uncontrolled Exposure” which is from FCC report OET bulletin #65.

Table 1 (B)

FCC Limits for Maximum Permissible Exposure (MPE)

(B) Limits For General Population/Uncontrolled Exposure

Frequency Range (MHz)

0.3 - 1.34 614 1.63 (100)*

1.34 - 30 824/f 2.19/f (180/f 30 - 300 27.5 0.073 0.2 300 - 1500 -- -- f/1500 1500 - 100,000 -- -- 1.0 f = Frequency in MHz *Plane-wave equivalent power density.

Table 2 lists the antennas recommended for use in the VHF frequency range. Each model of this radio was tested with the appropriate antenna listed. The antenna shall be mounted to a tower and be a minimum of 10 meters above the ground at the lowest point on the antenna. The radio manufacturer has determined that the user and service personnel should remain four (4) meters in distance away from the antenna when transmitting. By maintaining this distance, these individuals are not exposed to radio frequency energy or magnetic fields in excess of the guidelines set forth in Table 1 (B).

NOTE: Other antennas or installation configurations that have not been tested may not comply with FCC RF exposure limits and therefore are not recommended.

Electric Field Strength

(E) (V/m)

Magnetic Field Strength

(H) (A/m)

Power Density

(S) (mW/cm

)

Table 2

Recommended Antennas

(Antenna Manufacturer - Decibel Products)

October 1995 Part No. 001-2008-202

Frequency Antenna Model No.

132-144 MHz DB205E 144-178 MHz DB205F

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TABLE OF CONTENTS

1 INTRODUCTION AND OPERATION

1.1 SCOPE OF MANUAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.2 REPEATER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.3 REPEATER IDENTIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.4 MODEL NUMBER BREAKDOWN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.5 ACCESSORIES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-1

1.6 PRODUCT WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.7 FACTORY CUSTOMER SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.8 FACTORY RETURNS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-2

1.9 REPLACEMENT PARTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.10 SOFTWARE UPDATES/REVISIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

1.11 REPEATER OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-3

MAIN PROCESSOR CARD (MPC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

MAIN AUDIO CARD (MAC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

INTERFACE ALARM CARD (IAC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6

POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

1.12 REPEATER INFORMATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

HOME REPEATERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

INTER-REPEATER DATA COMMUNICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

MOBILE TRANSCEIVERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

1.13 REPEATER DATA BUS SIGNALING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-7

GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7

MOBILE DATA MESSAGE ORDER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

ID VALIDATOR OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8

2 INSTALLATION

2.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

SITE PREPARATION AND ANTENNA INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

2.2 ENVIRONMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.3 VENTILATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-1

2.4 AC POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.5 BATTERY BACKUP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

2.6 800W POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-2

AC INPUT REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2.7 GROUNDING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-4

PROTECTION GUIDELINES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2.8 UNPACKING AND INSPECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-5

2.9 REPEATER DATA BUS INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-6

MPC DATA BUS SWITCH SETTINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

MPC DATA BUS JUMPER SETTINGS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

2.10 CONNECTING RECEIVE AND TRANSMIT ANTENNAS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .2-7

3 SOFTWARE

3.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1

HOW TO USE THIS MANUAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

GETTING STARTED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

COMPUTER DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

EEPROM DATA STORAGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1

COMMAND LINE OPTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

COLOR OR MONOCHROME OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

TABLE OF CONTENTS (CONT.)

3.2 REPEATER PROGRAM SOFTWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

INSTALLING THE SOFTWARE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

MINIMUM FREE MEMORY REQUIRED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3.3 REPEATER PROGRAMMER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

PROGRAM FILES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3.4 ALIGNMENT SOFTWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3.5 HELP F1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

4 PULL DOWN MENUS

4.1 MENU DISPLAYS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.2 FILE MENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

LOAD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

SAVE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

SAVE AS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

NEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

PRINT REPEATER CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

DOS SHELL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

QUIT (ALT X) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4.3 EDIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

SETUP PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

SELECT REPEATER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

ALARM CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

REPEATER TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

DELETE REPEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

TELEPHONE PARAMETERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4.4 TRANSFER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

WRITE SETUP PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

READ SETUP PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4.5 HARDWARE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

HSDB MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

RECEIVE/TRANSMIT DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

RF DATA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

REVISION/VERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

MODE SELECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

4.6 TEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

POWER AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

RECEIVER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

EXCITER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

FULL REPEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4.7 UTILITIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

COM PORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

DISPLAY MODE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

USER LEVEL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

5 REPEATER PROGRAMMING

5.1 CREATING A NEW FILE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

SELECT REPEATER TO EDIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2 ADDING A REPEATER TO A FILE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

TABLE OF CONTENTS (CONT.)

6 CIRCUIT DESCRIPTION

6.1 RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

REGULATED VOLTAGE SUPPLIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

HELICAL FILTERS, RF AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

12.5 kHz IF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

25 kHz IF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

ACTIVE FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-4

BUFFER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

BUFFER AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

LOCK DETECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

CHARGE PUMP, LOOP FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

VOLTAGE MULTIPLIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

BUFFER AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

FIRST AND SECOND INJECTION AMPLIFIERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

6.2 EXCITER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-8

VCO (A007). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

VCO BUFFER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

VCO/TCXO FREQUENCY MODULATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-8

SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

BUFFER AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

LOCK DETECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-10

CHARGE PUMP, LOOP FILTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

BUFFER AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

RF AMPLIFIERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

6.3 110W POWER AMPLIFIER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-11

AMPLIFIER/PREDRIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

DRIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-11

FINAL AMPLIFIERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

POWER DETECTORS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

THERMAL SENSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

FORWARD/REVERSE POWER DETECT, CIRCULATOR, LOW-PASS FILTER . . . . . . . . . . . . . . . . . . . . . . . 6-12

6.4 RF INTERFACE BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-13

POWER CONNECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

SIGNAL CONNECTOR (J101). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-13

FAN CONNECTOR (J104) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

POWER AMPLIFIER CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-15

EXCITER CONNECTOR (J102). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-16

RECEIVER CONNECTOR (J103) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-17

6.5 800W POWER SUPPLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-20

FILTER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20

POWER FACTOR CORRECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20

MAIN PULSE WIDTH MODULATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-20

SYNCHRONIZING CIRCUITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22

FAN AND THERMAL SHUTDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-22

+15V CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

+5V CONVERTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

-5V CONVERTER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

POWER SUPPLY REPAIR AND ALIGNMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-23

TABLE OF CONTENTS (CONT.)

6.6 BATTERY BACK-UP MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24

OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24

CHARGER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-24

REVERSE BATTERY PROTECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

ENGAGING THE RELAY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

OVER/UNDERVOLTAGE SHUTDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

BBM FAN CONTROL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26

6.7 CARD RACK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26

6.9 EXTERNAL CONNECTOR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27

6.10 MAIN PROCESSOR CARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

MAIN CONTROLLER MICROPROCESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29

HIGH SPEED DATA BUS MICROPROCESSOR (U13). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-29

CHIP SELECT DECODERS (U15/U4). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30

P1 SIGNAL CONNECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-30

J1 COMPUTER CONNECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

J2 MEMORY SELECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

J3 BAUD RATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

S2/S3 HSDB SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

J4 EPROM MEMORY LOADING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

J5 HSDB SPEED . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

J6 WATCHDOG. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-31

6.11 MAIN AUDIO CARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

AUDIO/DATA MICROPROCESSOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

RECEIVE AUDIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-32

RECEIVE SQUELCH CIRCUITRY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33

RECEIVE DATA CIRCUITRY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33

RECEIVE AUDIO PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-33

VOTER AUDIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34

COMPANDOR OPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34

TRANSMIT AUDIO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34

TRANSMIT AUDIO PROCESSING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-34

TRANSMIT DATA AND CWID PROCESSING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35

P101 SIGNALING CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-35

P100 EXTERNAL OUTPUTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-36

J100 A D LEVEL TEST POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

J101 SPEAKER/MICROPHONE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

J102 LOCAL MICROPHONE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

J103 GROUND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

J104 EXTERNAL SPEAKER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

J105 WATCH DOG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

J106 TX DATA PATH. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

A301 COMPANDOR CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-37

6.12 INTERFACE ALARM CARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

RELAY OUTPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

ISOLATED INPUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

ALARM INDICATORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-39

ALARM FUNCTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-39

P500 SIGNALING CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-40

P501 EXTERNAL OUTPUTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-41

J500 A D LEVEL TEST POINT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43

J501 GROUND. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43

J502 +15V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43

POWER SWITCH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43

J505 SQUELCH ENABLE OUTPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-43

TABLE OF CONTENTS (CONT.)

7 ALIGNMENT AND TEST PROCEDURES

7.1 RECEIVER ALIGNMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-1

PRETEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

VOLTAGE MEASUREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

PROGRAM TUNE-UP CHANNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

RECEIVER FREQUENCY ADJUST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

VCO TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

FRONT END ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

AUDIO DISTORTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-3

7.2 EXCITER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-4

PRETEST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

VOLTAGE MEASUREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

PROGRAM TUNE-UP CHANNEL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

VCO TEST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

TCXO FREQUENCY ADJUST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

TRANSMIT MODULATION ADJUST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-5

7.3 110W POWER AMPLIFIER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-6

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

DRIVER TUNING AND LIMIT ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

POWER AMPLIFIER TUNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-6

7.4 FULL REPEATER ALIGNMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7-11

PERFORMANCE TEST PROGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

REPEATER SETUP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

TRANSMITTER TEST/ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

RECEIVER TESTS/ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-11

TRANSMIT AUDIO/DATA LEVEL ADJUSTMENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-13

VOTER AUDIO LEVEL ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15

AUDIO/DATA LEVEL ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15

REPEATER OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

8 SERVICING

8.1 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1

PERIODIC CHECKS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

SURFACE-MOUNTED COMPONENTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

SCHEMATIC DIAGRAMS AND COMPONENT LAYOUTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

REPLACEMENT PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

TCXO MODULES NOT SERVICEABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8.2 SYNTHESIZER SERVICING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-1

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-1

TCXO MODULE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

VOLTAGE CONTROLLED OSCILLATOR (VCO) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

INTERNAL PRESCALER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

CALCULATING "N " AND "A " COUNTER DIVIDE NUMBERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-3

8.3 RECEIVER SERVICING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3

8.4 TRANSMITTER SERVICING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3

8.5 POWER SUPPLY SERVICING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-3

VOLTAGE CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

8.6 CHIP COMPONENT IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5

CERAMIC CHIP CAPACITORS (510-36xx-xxx) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

TANTALUM CHIP CAPACITORS (510-26xx-xxx). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

CHIP INDUCTORS (542-9000-xxx). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

CHIP RESISTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-5

CHIP TRANSISTORS AND DIODES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-7

8.7 GRAFOIL REPLACEMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-7

TABLE OF CONTENTS (CONT.)

9 PARTS LIST

VIKING VX VHF LTR REPEATER. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

110W VHF LTR REPEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

REPEATER ENCLOSURE ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

TRANSCEIVER MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2

CONTROLLER BACKPLANE CARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-2

EXTERNAL CONNECTOR BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

POWER SUPPLY FILTER BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

RF INTERFACE BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-3

REPEATER RX./EX MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-5

RECEIVER VCO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6

12.5/25 kHz RECEIVER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-6

TRANSMIT VCO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-10

EXCITER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-11

110W POWER AMPLIFIER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-13

LOW-PASS FILTER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-15

FORWARD/REVERSE POWER DETECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-15

POWER AMPLIFIER MECHANICAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-15

800W POWER SUPPLY MAIN BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-16

AC FILTER BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-21

BATTERY BACK-UP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-22

THERMAL SENSOR BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-23

MAIN PROCESSOR CARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-23

MAIN AUDIO CARD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-25

INTERFACE ALARM CARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-30

10 SCHEMATICS AND COMPONENT LAYOUTS

10-1 RF MODULE INTERFACE CONNECTOR. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2

10-2 BACKPLANE CABLE CONNECTIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-2

10-3 REPEATER CABINET EXPLODED VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3

10-4 REPEATER REAR VIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3

10-5 REPEATER FRONT VIEW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-3

10-6 INPUT/OUTPUT ALARM INTERCONNECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4

10-7 RF INTERCONNECT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-4

10-8 BACKPLANE INTERCONNECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-5

10-9 RF INTERFACE BOARD COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-6

10-10 RF INTERFACE BOARD SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-7

10-11 RECEIVER COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-8

10-12 RECEIVER VCO COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10

10-13 RECEIVE VCO SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-10

10-14 RECEIVER SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-11

10-15 EXCITER COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-12

10-16 TRANSMIT VCO COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14

10-17 TRANSMIT VCO SCHEMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-14

10-18 EXCITER SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-15

10-19 110W POWER AMPLIFIER COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-16

10-20 110W POWER AMPLIFIER SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-17

10-21 FORWARD POWER COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18

10-22 REVERSE POWER COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-18

10-23 FORWARD/REVERSE POWER SCHEMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-19

10-24 MAIN PROCESSOR CARD COMPONENT LAYOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-20

10-25 MAIN PROCESSOR CARD SCHEMATIC (1 OF 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-21

TABLE OF CONTENTS (CONT.)

10-26 MAIN PROCESSOR CARD SCHEMATIC (2 OF 2). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-22

10-27 MAIN AUDIO CARD COMPONENT LAYOUT (COMPONENT SIDE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-23

10-28 MAIN AUDIO CARD COMPONENT LAYOUT (OPPOSITE COMPONENT SIDE) . . . . . . . . . . . . . . . . . . . . 10-24

10-29 MAIN AUDIO CARD SCHEMATIC (1 OF 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-25

10-30 MAIN AUDIO CARD SCHEMATIC (2 OF 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-26

10-31 MAIN AUDIO CARD SCHEMATIC (3 OF 3). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-27

10-32 INTERFACE ALARM CARD COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-28

10-33 INTERFACE ALARM CARD SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-29

10-34 BACKPLANE COMPONENT LAYOUT (CARD SIDE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-30

10-35 BACKPLANE COMPONENT LAYOUT (OPPOSITE CARD SIDE) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-31

10-36 BACKPLANE SCHEMATIC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-32

10-37 POWER SUPPLY FILTER BOARD COMPONENT LAYOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-33

10-38 POWER SUPPLY FILTER BOARD SCHEMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-33

10-39 POWER CABLE CONNECTOR AND SCHEMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10-34

LIST OF FIGURES

1-1 REPEATER IDENTIFICATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1-2 PART NUMBER BREAKDOWN. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1-3 REPEATER CARDS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4

2-1 BATTERY BACKUP CONNECTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2-2 TEMPERATURE SENSOR CABLE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2

2-3 POWER CABLE CONNECTOR AND SCHEMATIC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3

2-4 RACK MOUNTED REPEATERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5

2-5 5-CHANNEL COMBINING SYSTEM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6

2-6 RJ-11 TO BNC MPC JUMPERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-7 RJ-11 TO RJ-11 MPC JUMPERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-8 ANTENNA CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-9 RJ-11 TO BNC ADAPTER MODULE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7

2-10 SINGLE REPEATER INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2-11 TWO REPEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8

2-12 THREE OR MORE REPEATERS INSTALLATION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-9

2-13 MIXED VIKING VX AND CR1100 REPEATER INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10

3-1 REPEATER TEST MENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3

3-2 PROGRAMMING FLOWCHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4

4-1 FILE MENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-2 LOAD FILE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-3 SAVE FILE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4-4 EDIT PROGRAMMING FLOWCHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

4-5 EDIT MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4-6 REPEATER LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4-7 ALARM CONFIGURATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4-8 INPUT ALARMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

4-9 OUTPUT ALARMS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4-10 ALARM CROSS REFERENCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4-11 REPEATER TYPE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4-12 DELETE REPEATER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

4-13 TRANSFER MENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4-14 WRITE SETUP PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4-15 PROGRAM WRITE SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4-16 READ SETUP PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4-17 READING SETUP. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

4-18 HARDWARE PROGRAMMING FLOWCHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6

TABLE OF CONTENTS (CONT.)

4-19 HARDWARE MENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

4-20 HSDB MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

4-21 MOBILE TRAFFIC MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7

4-22 RF LINE MONITOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

4-23 REVISION/VERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

4-24 REVISION/VERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8

4-25 TEST PROGRAMMING FLOWCHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

4-26 TEST MENU . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9

4-27 UTILITIES MENU. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4-28 COM PORT SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4-29 LAPTOP INTERCONNECT CABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

4-30 COLOR MODE SELECTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10

5-1 SETUP PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-2

6-1 12.5 kHz IF RECEIVER BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

6-2 U201/U203 BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

6-3 25 kHz IF RECEIVER BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-3

6-4 SYNTHESIZER BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-5

6-5 EXCITER BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9

6-6 110W POWER AMPLIFIER BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12

6-7 RF INTERFACE BOARD BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-19

6-8 BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-21

6-9 NO LOAD CHARGE VOLTAGE vs. TEMPERATURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-25

6-10 BACKPLANE CONNECTORS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-26

6-11 EXTERNAL CONNECTOR BOARD. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-27

6-12 U27 BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-28

6-13 4 I/O J1 ALARM OUTPUTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

6-14 4 I/O J2 ALARM OUTPUTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-38

6-15 S500-S503. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-39

6-16 ALARM EXAMPLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-39

6-17 MAIN PROCESSOR CARD BLOCK DIAGRAM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-45

6-18 MAIN AUDIO CARD LOGIC BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-46

6-19 MAIN AUDIO CARD AUDIO BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-47

6-20 INTERFACE ALARM CARD BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-48

7-1 RECEIVER ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-2

7-2 EXCITER ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4

7-3 110W POWER AMPLIFIER ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7-4 RF INTERFACE BOARD ALIGNMENT POINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7-5 POWER EXTENDER CABLES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7

7-6 RECEIVER TEST SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-8

7-7 EXCITER TEST SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-9

7-8 110W POWER AMPLIFIER TEST SETUP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-10

7-9 S100 SETTING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-15

7-10 NEW HSDB SWITCH SETTINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

7-11 J2 TERMINAL BLOCK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-16

7-12 MAC ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-17

7-13 MAIN PROCESSOR CARD ALIGNMENT POINTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-18

7-14 INTERFACE ALARM CARD ALIGNMENT POINTS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-19

8-1 LOCK DETECT WAVEFORM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

8-2 MODULUS CONTROL WAVEFORM. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

8-3 POWER SUPPLY REAR VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

8-4 POWER SUPPLY FRONT VIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-4

8-5 3-DIGIT RESISTOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-6

TABLE OF CONTENTS (CONT.)

1-1 REPEATER ACCESSORIES 1-2 1-2 ACTIVE REPEATER ALARMS 1-5 2-1 OUTPUT VOLTAGES 2-3 2-2 OVER VOLTAGE 2-3 5-1 REPEATER SETUP PARAMETERS 5-2 8-1 CERAMIC CHIP CAP IDENTIFICATION 8-6 8-2 CHIP INDUCTOR IDENTIFICATION 8-7

LIST OF TABLES

TABLE OF CONTENTS (CONT.)

INTRODUCTION AND OPERATION

SECTION 1 INTRODUCTION AND OPERATION

1.1 SCOPE OF MANUAL

This service manual provides installation, operation, programming, service, and alignment information for the VIKING



VX LTR Repeater, Part No.

242-20X1-213.

1.2 REPEATER DESCRIPTION

The VIKING VX repeater is designed for operation in a Johnson LTR system. It operates on the VHF channels from 132-178 MHz. Channel spacing is

12.5/25 kHz and RF power output is adjustable from 25 to 125 watts.

This repeater is modular in design for ease of service. There are separate assemblies for the logic cards, receiver

, exciter, power amp lifier and power

supply sections.

This repeater is progr ammed wit h a l apt op or per sonal computer using the 2000 Series Programmer software, Part No. 023-9998-390.

1.4 MODEL NUMBER BREAKDOWN

The following breakdown shows the part num-

ber scheme used for the Viking VX.

3242- 2 0 X 1 -

1 = 132-150 MHz 3 = 150-174 MHz

VHF

25-110W

12.5/25 kHz

LTR

Figure 1-2 PART NUMBER BREAKDOWN

1.5 ACCESSORIES

The accessories available for the Viking VX LTR repeater are listed in Table 1-1. A brief description of some of these accessories follows.

2-Wire Telephone Interconnect Card (TIC) - This card provides an interface between the Repeater and a phone line to permit telephone calls to be placed to and from mobile transceivers.

The VIKING VX repeater i nte rf ace s wit h a MPC (Main Processor Card) and MAC (Main Audio Card) to provide LTR operation. All signal ports used to interface to the Repeater are on J2 located at the back of the cabinet.

1.3 REPEATER IDENTIFICATION

The repeater identi ficati on number is pri nted on a label that is affixed to the inside of the repeater cabinet. The following infor mation is contained in that number:

Repeater

20X4X

Revision

Letter

Manufacture

Date

Week Year A= Waseca

WarrantyPlant

Number

12345A324A

Figure 1-1 REPEATER IDENTIFICATION

LTR System ID Validator - If an invalid ID is detected on the repeater data bus, the audio of the mobile receiving the ca ll is disabled.

2000 Series Service Kit - This kit contains an alarm wire harness, extender power cable, programming kit, extender card, ex tender harne ss, and a TIC bi as cab le. These items are used when tuning the repeater and while troubleshooting.

Battery Backup and Cable Option - This option can be factory or field installed (refer to installation instructions 004-2000-830). It includes the battery backup module that resides in the power supply and the necessary interconnect cabling to connect the repeater to the batterie s (see Section 2.5).

RJ-11 to 6-BNC Adapter - This adapter box provides connections for the high speed data bus at the rear of the repeater and the data bus from the logic drawers in existing repeater syste m s.

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Table 1-1 REPEATER ACCESSORIES

Accessory Part No.

2-Wire Telephone Interconnect Card 023-2000-370 LTR System ID Validator 023-4408-500 2000 Series Service Kit Battery Backup option and cable 023-2000-835 RJ-11 to 6-BNC Adapter 3’ RG-58 coax w/male BNC for HSDB 023-4406-5 05 6’ RG-58 coax w/male BNC for HSDB 597-3001-2 14 Custom Frequency Prog rammin g & Set up 023-2000-100 PC programmer PGMR 2000 software 023-9998-390 Service Microphonee 589-0015-011 50 ohm Termination HSDB 023-4406-504 Programming cable kit Extender Card 023-2000-230 Extender cable kit, 7 ft. 250-2000-010

Includes: extender card, extender cables, TIC bias cable

and programming cable kit (PN 023-2000-195).

Required when using Viking Networking products, one per station. 3 Included in 2000 Series Service Kit (PN250-2000-230).

250-2000-230

023-2000-194

023-2000-195

1.7 FACTORY CUSTOMER SERVICE

The Custom er Service Department of the E.F. Johnson Company provides customer assistance on technical problems and the availability of local and factory repair facilities. Customer Service hours are 7:30 a.m. - 4:30 p.m. Central Time, Monday - Friday. There is also a 24-hour emergency technical support telephone number. From within the continental United States , the Customer Service Department can be reached toll-free at:

1-800-328-3911

When your call is answered at the E.F. Johnson Company, you will hear a brief messa ge informing you of numbers that can be entered to reach various departments. This number may be entered during or after the message using a tone-type telephone. If you have a pulse-type telephone, wait until the message is finished and an operator will come on the li ne t o assist you. When you enter a first number of "1" or "2", another num ber is requested to further categorize the type of information. You may also enter the 4-digit extension number of the per son th at you want to reach.

PC Programmer PGMR Software - 3.5" programming disk used to program the repeater.

Programming Cable Ki t - This kit connects the MPC and a computer during programming and for monitoring repeater activity at the site.

Extender Card - Used to exte nd the cards plugged into the backplane beyond the card rack enclosure when tuning the repeater and while troubleshooting.

Extender Cable Kit - These are seven foot extension cables for the RF T ransceiver power and data, when the transceiver is removed from the cabinet.

1.6 PRODUCT WARRANTY

The warranty statement is available from your product supplier or from the Warranty Department, E.F. Johnson Company, 299 Johnson Avenue, Box 1249, Waseca, MN 56093- 0514. This information may also be requested by phone from the Warranty Department. The Warranty Department may also be contacted for Warranty Service Reports, claim forms, or any questions with warranties or warranty service by dialing (507) 835-6970.

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FAX Machine - Sales (507) 835-6485 FAX Machine - Cust Serv (507) 835-6969

If you are calling from outside the continental United States, the Customer Service telephone numbers are as follows:

Customer Service Department - (507) 835-6911 Customer Service FAX Machine - (507) 835-6969

You may also contact the Customer Service Department by mail. Please include all information that may be helpful in solving your problem. The mailing address is as follows:

E.F. Johnson Company Customer Service Department 299 Johnson Avenue P.O. Box 1249 Waseca, MN 56093-0514

1.8 FACTORY RETURNS

Repair service is normal ly availab le through local authorized E.F. Johnson Land Mobile Radio Service Centers. If local service is not avail able, the equipment

1-2

INTRODUCTION AND OPERATION

can be returned to the factory for repair. However, it is recommended that you contact the Field Service Department before retu rning equip ment. A servic e representative may be able to suggest a solution to the problem so that return of the equipment would not be necessary.

Be sure to fill out a Factor y Repair Req uest For m #271 for each unit to be repaired, whether it is in or out of warr anty. These forms are available free of charge by calling the r epa ir lab ( see Sect ion 1.7) or by requesting them when you send a unit in for repair. Clearly describe the difficulty experienced in the space provided and also note any prior physical damage to the equipment. Then include a form in the shipping container with each u nit . Your phone number and contact name are very important because there are times when the technicians have specific questions that need to b e answered in order to completely identify and repair a problem.

When returning equipment for repair, it is also a good idea to use a PO number or some other re fe rence number on your paperwork in case you need to call the repair lab about your unit. These numbers are referenced on the repair order and it makes it easier and faster to locate your unit.

Return Authorization (RA) numbers are not necessary unless you have been given one by the Field Service Department. They require RA numbers for exchange units or if they want to be aware of a specific problem. If you have been given an RA number, reference this number on the Factory Repair Request Form sent with the unit. The repair lab will then contact the Field Service Department when the unit arrives.

You may also send your order by mail or FAX. The mailing address is as follows and the FAX number is shown in Section 1.7.

E.F. Johnson Company Service Parts Department 299 Johnson Avenue P.O. Box 1249 Waseca, MN 56093-0514

1.10 SOFTW ARE UPDATES/REVISIONS

All inquiries concerning updated software, its installation and revisions should be directed to the Customer Service Department (see Section 1.7).

1.1 1 REPEATER OPERATION

1.11.1 MAIN PROCESSOR CARD (MPC)

Refer to Figure 1-3.

Programming Jack

J1 provides input connection from the computer and the "flash memory" in the MPC. The programming information in an IBM



PC programs the MPC directly from the serial card through an interconnect cable to the COM1 or COM2 port.

Reset

S1 provides a manual res et of the Mai n Pro cessor Card (MPC). A manual reset causes a complete power-up restart.

Display and LEDs

1.9 REPLACEMENT P ARTS

E.F. Johnson replacement parts can be ordered directly from the Service Parts Department. To order parts by phone, dial the toll-free number and then enter "1" as described in Section 1.7. When ordering, please supply the part number and quantity of each part ordered. E.F. Johnson dealers also need to give their account number.

If there is uncertainty about the part number, include the designator (C112, for example) and the model number of the equipment the part is from (refer to Section 1.4).

Each combination of DS1 display read-out and CR4/CR5 indication refers to an active alarm. See Ta ble 1-2 for alarms and definitions. LED indications: CR1 is blinking; MPC is operational, CR2 on; 380-470 MHz, off is 475-520 MHz and CR5 on; indicates an LTR Repeater.

RF Thermal Sense Alarm Condition Exists

NOTE: Safety measures are disabled

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Alarms

When the Repeater is in Test mode the safety measures are disabled. Therefore, if the Repeater is keyed for an extended period and the power amplifier temperature increa se, thermal shutdown will not occur . There are pop-up windows that appear in the Test mode screens to alert the user that there is an alarm and action should be taken. Refer to Figure 1-3 for an example of this type of alarm.

RF INTERFACE

BOARD

PROG JACK

RESET

DS1

GND

GRN

CR1

YEL

CR2

YEL

CR5

RED

CR4

RED

CR3

J103

J100

A D

LEVEL

LOCAL

ON/OFF/VOL

R236

MIC

J102

SPKR

J101 J104

EXT SPKR

+15V

+15V ACC

-5V

+5V

CWID HANG SWITCH MOBILE XMIT

J500

J501

GND

J502

+15V

S508

IACMACMPC

EXCITER/RECEIVER

Figure 1-3 REPEATER CARDS

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INTRODUCTION AND OPERATION

Table 1-2 ACTIVE REPEATER ALARMS

Alarm No. DS1 CR3 CR4 Definition

Test Mode IAC input 1 Active IAC input 2 Active IAC input 3 Active IAC input 4 Active MAC Processor Alarm HSDB Processor/Cable Alarm IRDB Cable Alarm Switch (RNT)/CIM Channel Problem Alarm TIC Processor Alarm MMC Processor Alarm VNC Alarm AC Power Failure Battery Power Failure Power supply thermal sense Fan 1 current out of specification Fan 2 current out of specification IAC mismatch RF shutdown RF Half Power Mode Thermal sense in RF portion RF Finals 1-2 power out fai lure RF Finals 3-4 power out fai lure RF VSWR Failure Normal Synthesizer Tx Lock failure Normal Synthesizer Rx Lock failure HS Synthesi zer Tx Lock failure HS Synthesizer Rx Lock failure RF Quarter Power Alarm

10 11 12 13 14 15 16 17 18 19 20 21 32 33 34 35 36 37 38 39 40 41 42

0 1 2 3 4 9

0 1 2 3 4

9 A B C D E

9 A

Off Off Off Off Off Off Off Off Off Off Off Off

On On On On On On On On On On On On On On On On On

On On On On On On On On On On On

On Off Off Off Off Off Off

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1.11.2 MAIN AUDIO CARD (MAC)

Refer to Figure 1-3.

External Speaker Jack

J104 provides repeater audio output to an exter nal speaker. The local volume control adjusts the volume level of this speaker.

Speaker/Microphone Jacks

J102 provides audio input from a microphone. J101 provides the receive audio to the microphone.

Local On/Off/Volume Control

R236 provides control o f the rec eive a udio ou tput to J101 and J104. Turning this control clockwise past the detent applies voltage to the local audio amplifier.

A D Level Test Point

J100 provides audio/data level output for test level checks.

Power Supply On/Off Switch

S508 turns the power supply DC voltages on and

off from the IAC in the front of the repeater.

Power Indicator

CR501 indicates the +5V supply is at normal level and applied to the IAC. CR524 indicates -5V supply is at normal level and applied to the IAC. CR523 indicates the +15V accessory supply is at normal level. CR525 indicates that the +15V supply is at normal level and applied to the IAC.

CWID Indicator

Indicates that the CW Identification is being transmitted on the lowest-frequency repeater. The CWID is a continuous-wave (CW) transmission of the station call letters in Morse Code to satisfy the station identification re quirement. The CWID is programmed into the repeater memory. This indicator also is used when an alarm is transmitted with Mor se code.

Hang Indicator

Ground

J103 is connected to ground for test equipment

when monitoring test point J100.

1.11.3 INTERFACE ALARM CARD (IAC)

Refer to Figure 1-3.

Voltage Test Output

J502 provides a +15V test point on the IAC.

Ground

J501 is connected to ground for test equipment

when monitoring voltage test point J502.

A D Level Test Point

J500 provides a test point to monitor audio and

data levels, AC fail and the rmal sensor.

Indicates that the hang word is being transmitted by the repeater. This word is transmitted on calls in which the channel is held for the duration of the call and not just for the duration of the transmission. The hang word tells the mobiles to stay on the same channel and not re-access the system when responding to a call.

Switch Call Indicator

Not used in th e LTR repeater.

Mobile Call Indicator

Mobile-to-repeater transmission in progress is indicated by the Mobile Call Indicator.

Xmit Indicator

This indicates that the repeater transm itter is keyed by the logic.

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INTRODUCTION AND OPERATION

1.11.4 POWER SUPPLY

The power supply is sealed and the line and supply fuses are inside. If a supply fuse opens, the power supply must be removed and opened for repair (see Section 2.4 and 8.5). Refer to the power supply service manual 004-2000-810.

Standby Battery Jack

This provides a connection point for a +24V DC standby battery. Current is drawn from the battery only when the power supply output voltage is lower than the battery voltage. A trickle charge switch on the supply ensures that the battery is fully charged. Disable this switch when a separate battery charger is used (see Section 2.5).

1.12 REPEATER INFORMATION

1.12.1 INTRODUCTION

NOTE: The VIKING VX does not require a separate LTR logic drawer.

The repeater model used in an LTR system is determined by freque ncy range. 800 MHz s ystems use the VIKING VX (2008-232/-234) or LTR 8000s, UHF use 20x4-232/-234 or 1010s, and VHF use 2011/2031213 or 110 0s. Repeat ers ope rate on a singl e fre quen cy (one repeater is required for each channel). The MPC in each repeater performs all control and signaling functions on that channel. Information is exchanged between repeaters via a high-speed data bus (modular cable). No system controller is required.

it is always monitoring its Home repea ter to determine which channel is free and if it is being called by another mobile.

The Home repeater is always used to make a call unless it is busy . When the Home repeater is busy, any other repeater in the site may then be used. Up to 250 ID codes are assigned to each repeater. An ID code and Home repeater number are the "address" of the mobiles in the system. Therefore, up to 1250 separate addresses can be assigned in a 5-repeater system and up to 5000 can be assigned in a 20-repeater system. An ID code may be assigned to an individual mobile or a group of mobiles as required.

1.12.3 INTER-REPEATER DATA COMMUNICA-

TION

Data communication between VIKING VX and LTR repeaters at a site is via a high-speed data bus. This bus cable is installe d in a daisy-chain manner between repeaters. If both VIKING VX and LTR repeaters are located a t a site, 20 rep eaters can be interconnected. Refer to Section 2.8 for information on connecting the data bus.

1.12.4 MOBILE TRANSCEIVERS

The mobile and handheld transceivers used in an LTR system must be compatible with the type of signaling in use and also the frequency range.

1.13 REPEATER DATA BUS SIGNALING

1.13.1 GENERAL

Optional ac cessories, such as the Telephone Interconnect Card (TIC) can be inst alled in the repeater and the ID V alidator drawer can be installed in the repeater rack. Refer to Johnson LTR ID Validator Manual, Part No. 001-4408-501 and Johnson Telephone Interconnect Card Manual, Part No. 004-2000-3 70 for det ail ed information.

1.12.2 HOME REPEATERS

All mobiles have one of the site repeaters assigned as its "Home" repeater. This is the repeater from which it receives mo st of its contr ol information. When a mobile is not placing or receiving a call,

A single-line serial data bus interconnects the logic units of all the LTR repeaters at the site. The first repeater powered on generates the synchronization pulse that is used by all other repeaters to determine their time sl ot o n the data bus. If al l r epe aters are powered on at the same time, the lowest numbered repeater generates the synchronization pulse. There are 21 slots with 1-20 used for repeater reporting and 21 used by the ID Validator (see Section 1.13.3). The time slot used by a repeater is determined by the number assigned to that repeater by the programming in the MPC. Repeater 1 uses time slot 1, repeater 5 uses time slot 5 , and so on. The data rate on the repeater data bus is 18,750 bits per second.

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In its time slot, each repeater places information on the data bus indica ting its sta tus. If a repea ter i s not busy, only start bits appear in its slot. If a repeater is busy, it places in its slot the Home rep eater and ID code of the mobile receiving the cal l on that repeater. If a repeater number is unassigned, nothing appears in that time slot.

1.13.2 MOBILE DATA MESSAGE ORDER

Each repeater monitors all the time sl ots on the repeater data bus. If it detects its numb er in another time slot, it begins transmitting an additional data message to its mobiles. This message tells mobiles programmed to detect that ID code to go to that repeater to receive a call. This additional message continues for as long as the mobile is transmitting on the other repeater.

The sequence of data messages transmitted on a home repeater is as follows: Every third messag e is to the mobile currently receiving a call on that repeater. Then alternating b etween these mess ages are messag es to its mobiles that have been trunked to other repeaters. For example, assume that fivedifferent mobiles on

a five-repeater system are making calls. If all have Repeater 1 as their home channel (not very likely in actual practice), the data message order on Repeater 1 is as follows: 1 2 3 1 4 5 1 2 3 and so on.

1.13.3 ID VALIDATOR OPERATION

If the ID Validator is used, it is programmed wit h the status of up to all 5000 home repeater/ID code combinations possible with a 20-channel system. Each combination is programmed as either valid or invalid. Information in the twenty time slots on the repeater data bus is monitored. If an invalid home repeater/I D code combination is dete cted, the ID Validator places in time slot 21 the number of the repeater being used by the invali d mobile and al so the ID code. When a repeater detects its number in slot 21, it transmits the tur n-off code (31) to the mobile receiving the call. That mobile then squelches and resumes monitoring its home channel. This effectively disables the invalid mobile becau se it cannot ta lk to anyone. Wh en the turn-off code is sent, the repeater places "21" in the repeater po sition of its time slot to i ndicate to the ID validator that turn-off has occurred.

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1-8

SPECIFICATIONS

INTRODUCTION AND OPERATION

GENERAL (Per TIA 603)

Frequency Ranges 132-178 MHz Transmit/Receive (132-150 MHz and 150-178 MHz) Dimensions 9.125" H x 17" W x 20.9" D AC Voltage/Frequency 100-240V AC/50-60 Hz AC Current 0.38A (Standby), 1.4A (25W), 5A (110W) AC Input Power 45W (Standby), 170W (25W), 560W (110W) DC Current at 26.5V DC (Low Power) 6.3A (25W), 16.5A (110W) Number of Channels 1 (Synthesized, programmable) Channel Spacing 12.5 /15 /25 /30 kHz selectable Channel Resolution 5 / 6.25 kHz Temperature Range -30°C to +60°C (-22°F to +140°F) Duty Cycle Continuous FCC Type Acceptance ATH2422001 FCC Compliance Parts 15, 90

RECEIVER (Per TIA 603)

12 dB SINAD 0.35 µV 20 dB Quieting 0.50 µV Signal Displacement Bandwidth ±1 kHz (12.5/15 kHz), ±2.0 kHz (25/30 kHz) Adjacent Channel Rejection -85 dB (12.5/15 kHz), -90 dB (25/30 kHz) Intermodulation Rejection -85 dB Spurious & Image Rejection -100 dB Audio Squelch Sensitivity 12 dB SINAD Audio Response +1/-3 dB TIA Audio Distortion Less than 3% at 0.5W/16 ohms Local Audio Power 0.5W/16 ohms Audio Sensitivity ±0.75 kHz (12.5/15 kHz), ±1.5 kHz (25/30 kHz) Hum & Noise Ratio -50 dB Frequency Spread 2 MHz Frequency Stability ±2.5 PPM -30°C to +60°C (-22°F to +140°F) Modulation Acceptance Bandwidth ±3.5 kHz (12.5/15 kHz), ±7.0 kHz (25/30 kHz)

TRANSMITTER (Per TIA 603)

RF Power Out 132-178 MHz 110W (Default setting), 25-110W (Variable Set Point) Spurious Emissions -90 dBc Harmonic Emissions -90 dBc Audio Deviation ±1.6 kHz (12.5/15 kHz), ±3.5 kHz (25/30 kHz) LTR Data Deviation ±0.8 kHz (12.5/15 kHz), ±1 kHz (25/30 kHz) CWID Deviation ±1 kHz (12.5/15 kHz), ±2 kHz (25/30 kHz) Repeat Deviation ±0.8 kHz (12.5/15 kHz), ±1.5 kHz (25/30 kHz) Audio Response +1/-3 dB TIA Audio Distortion Less than 2% Hum & Noise (TIA) -50 dB (12.5/15 kHz), -55 dB (25/30 kHz) Frequency Spread 6 MHz Frequency Stability ±2.5 PPM -30°C to +60°C (-22°F to +140°F) Emission Designators 11K0F3E, 16K0F3E

These general specifications are intended for reference and are subject to change without notice. Contact the Systems Applications consultants for guaranteed or additional specifications.

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SECTION 2 INST ALLATION

INSTALLATION

2.1 INTRODUCTION

Information in this section tells how to set up the repeater for operat ion in an LTR system. It is assumed that the repeater has been previously aligned at the factory or as described in the alignment procedure in Section 7.

Even though each repeater is thoroughly aligned and tested at the factory, it is good practice to check performance before it is placed in service. This ensures that no damage occurred during shipment and that the repeater is otherwise operating properly. Performance testing is described in Sections 7.1, 7.2, 7.3 and 7.4.

2.1.1 SITE PREPARATION AND ANTENNA IN-

STALLATION

Site preparation and antenna installation are not within the scope of this manual. Basic installation requirements are discussed in the "Dealer Guide To Site Preparation", Part No. 004-8000-100. Factory installation is also available. Contact your Johnson representative for more information.

2.2 ENVIRONMENT

The following conditions should be considered when selecting a site for the Repeater.

Operating Temperature.

-30°C to +60°C (-22°F to +140°F).

NOTE: If the Repeater is installed in an area that exceeds these environmental conditions, the site should be equipped with air filters to remove dust and dirt that could cause the equipment to overheat.

When the repeaters are installed in an environment that contains small airborne particles, e.g. grain dust or salt fog, the repeater cabinets need to be sealed. A h eat exchanger, i.e. air conditioner, is then required to cool the cabinets. The air conditioners must be suited for the environment. Each repeater (110W) requires >2400 BTU/hr dissipation to maintain exterior cabinet temperature.

2.3 VENTILATION

The RF modules and the power supply are equipped with fans, controlled by thermostats, that force air through the equipment for cooling. The air flow is from the front to the back of the equipment. This permits the Repeaters to be stacked or rack mounted (see Figure 2-4). There are a few considerations when installing Repeaters to provide adequate air circulation.

1. The Repeaters should b e mounte d with a minimum

of 6 inches clearance between the front or back of the cabinet for air flow. The power supply requires a minimum of 18 inches at the back of th e Repeater for removal.

Humidity.

Less than 95% non-condensing rela ti ve humidity

at 50°C.

Air Quality.

For equipment operating in a controlled environ-

ment with the Repeaters rack mounted, the airborne particles must not exceed 30 µg/m

For equipment operating in an uncontrolled envi-

ronment with the Repeaters rack mounted, the airborne particles must not exceed 100 µg/m

NOTE: Repeaters should not touch. Leave a minimum of one empty screw hole (approximately 1/2") between repeaters vertically especially for bottom ventilation slots in high power repeaters.

2. Cabinet enclosures must provide air vents for ade-

quate air circulation.

3. Temperature and humidity must be considered

when several Repeaters are installed at a si te . Thi s might require air conditioning the site.

August 2000

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Part No. 001-2001-200

INSTALLATION

2.4 AC POWER

The AC power source to the Johnson VIKING VX Repeater can be 120V AC or 240V AC. Nothing need be done to the power supply for 240V AC operation. However, a 240V AC outlet requires that the 120V AC power plug be replaced. A locking AC power cord is provided for the supply.

The 120V AC cord is a standa rd 3-wi re gro unde d cord used with a standard AC wall outlet. The outlet must be capable of supplying a minimum of 560W. With the nominal 120V AC input, the source must supply 5A for each 110W repeater and should be protected by a c i rcuit breaker. It is recommended that all of the repeaters in a rack should not be on the same breaker in order to provi de one operational repeat er in the event a breaker trips. An AC surge protector is recommended for all equipment.

CHARGER

ACTIVE SWITCH

CHARGER

BATTERY

FAULT

EARTH

GROUND

LINE

REVERSE BATTERY

NEUTRAL

B- B+ TEMP

Figure 2-1 BATTERY BACKUP CONNECTOR

The temperature sensor is required to adjust the

charging voltage over temperature.

Each Repeater requires an outlet, so for a 5-channel system, a minimum of 5 outlets is required. An additional three outlets should be added for test equipment. The outlets must be within 3 feet of each Repeater cabinet. Future system expansion should be considered when electrical work is being planned for the initial system.

The VIKING VX Repeater power supply can be equipped with an optional 24V DC back-up in the event of AC p ower failure . Since the transmitter will remain on full power, if desired, the DC power source must have a current capabil ity of abo ut 20 A per 1 1 0W repeater or 100A for 5 - 110W repeaters. The multicoupler requires another 0.5A for a total system requirement at 24V DC of 100.5A for 110W repeaters.

2.5 BATTERY BACKUP

If the power supply is equipped with battery backup, screw lugs are provided on the front of the power supply for battery co nnections ( see Figure 2-1). A switch is provi ded fo r charging the battery or can be off if a separate battery charger is used. A battery temperature sensor connection is also provided. The temperature sensor cabl e is shown in Fi gure 2-2. LED indicators are provided to show Reverse Battery connection, Charger On/Off and Battery Fault.

TEMP

NEGATIVE

BATTERY

TERMINAL

WHT

BLK

GND

Figure 2-2 TEMPERATURE SENSOR CABLE

2.6 800W POWER SUPPLY

The power supply has four voltage output levels (see Table 2-1). Each voltage is set to ±1% at +25°C (+77°F). The output of this supply is capable or running any 2000 series repeater.

Each output is overload protected such that the power supply current limits and automatically resets when the overload is removed (see Table 2-1).

Each output is over voltage protected such that the power supply shuts down when an over voltage condition exists, usually when a component in the supply has failed (see Table 2-2). The power supply must be manually res et by toggling the Ena ble Li ne or removing A C power for more than 10 seconds.

August 2000 Part No. 001-2001-200

2-2

INSTALLATION

BACKPLANE

7 8

POWER HA R NESS

+26.5V

GROUND

+15V

AC FAIL IN

POWER SWITCH

THERMAL SENSOR

N/C

+15V

N/C

+5V

-5V

RFIB

REPEATER

BACKPLANE

Figure 2-3 POWER CABLE CONNECTOR AND SCHEMATIC

Table 2-1 OUTPUT VOLTAGES

Voltage Current Wattage

+26.5V 22A 583W

+15V 5A 75W

+5.2V 5A 26W

-5V 1A 5W

Table 2-2 OVER VOLTAGE

Voltage Range

+26.5V +32V to +33V

+15V +16V to +18V

+5.2V +6V to +7V

-5V -6V to -7V

2.6.1 AC INPUT REQUIREMENTS

AC Input Voltage: 100-240V AC Line Frequency: 50-60 Hz AC In-rush: 60A maximum Overall Efficiency: >70% at 100V AC

>80% at 240V AC Lightning protection: 6kV for < 1ms Power Factor: >0.97 at full load Brown Out Voltage: 80V AC Temperature -30°C - +60°C (full power)

Power factor correction per IEC555. The Power supply has the following safety agency approvals pending: UL1950, CSA22.2-950, TUV EN60950 (IEC950)

When the AC input voltage is below 90V AC, the maximum output power is decreased t o keep the input current constant. If a battery back-up is installed, the batteries take over when the AC input voltage falls below 80V AC (dependant on power output).

The AC input connector is an IEC connector equipped with a locking mechanism.

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INSTALLATION

The operating temperature range is -30°C to +60°C (-22°F to +140°F), i.e. the same as the repeater. The fan is thermostatically controlled by the internal temperature. When the internal heatsink temperature reaches +45°C (113°F) the fan turns on. When the heatsink temperature drops below +35°C (95°F) the fan turns off. If the internal heatsink temperature reaches +90°C (+194°F) the power supply turns off until the heatsink temperature drops below +85°C (+185°F). The over-temperature shutdown and restart are automatic.

2.7 GROUNDING

CAUTION

PROPER SITE GROUNDING AND LIGHTNING PROTECTION ARE VERY IMPORTANT TO PREVENT PERMANENT DAMAGE TO THE REPEATER.

As in any fixed radio installation, measures should be taken to reduce the possibility of lightning damage to the Viking VX equipment. Proper grounding eliminates shock hazard, protects against electromagnetic interference (EMI) and lightning.

Ground each piece of equipment separately. Do not ground one piece of equipment by connecting it to another grounded piece of equipment. A good DC ground must be found or created at the site. Rooftop site grounds can be researched through the building management or architects. Tower site grounds must be made with grounding rods. The many techniques for providing adequate grounds for towers and poles and for installi ng bui ldin g g round b us li nes a re be yond the scope of this manual. Refer to National Electrical Code article 250 "Grounding Techniques," article 800 "Communications Systems" and follow local codes.

The ground bus should be routed to the floor area within 5 feet of the system with a runner of 6 AW G or larger solid copper wire or 8 AWG stranded copper wire.

same wire sizes as specified for coaxial cables for any ground connections required by the secondary protectors.

An RF protector keeps any lightning strike to the antenna feed line or tower from damaging the Repeaters. Instal l this protection in-line with the combiner and antenna feed line.

RF protectors are selected by calculating the maximum instantaneous voltage at the output of the combiner. Do this by using the following equation.

= 1.414 (X) (√P(50))

where:

= Voltage at the output of the combiner.

P = repeater output in watts

X= for VSWR=

1.05 1.10 : 1

1.09 1.20 : 1

1.13 1.30 : 1

1.17 1.40 : 1

1.20 1.50 : 1

1.30 1.86 : 1

Example: Repeater power output of 60W with a VSWR of 1.3 : 1 (for this VSWR, X = 1.13):

= 1.414 (1.13) (√60(50))

VP = 1.59782 (√60(50)) VP = 1.59782 (54.772256) V

= 87.52V

Telephone Line

There are four types of pr ote ct ion suppressors for telephone lines; Gas Tube, Silicon Avalanche Diode, Metal Oxide Varistor and Hybrid.

The outer conductor of each transmission line at the point where it enters the building should be grounded using 6 AWG or larger solid copper wire or 8 AWG stranded wire.

Secondary protection (other than grounding) provides the equipment protection against line transients that result from lightning. There are two types of secondary protection, RF and Telephone Line. Use the

August 2000 Part No. 001-2001-200

The hybrid protector is ideal for E.F. Johnson equipment, and is strongly recommended. A hybrid suppressor combines several forms of protection not available in just one type of device. For example, a high-speed diode r eacts fir st, cl amping a volta ge str ike within 10 ns, a heavy duty heat coil reacts next to reduce the remainder of the current surge, and a highpowered three-element gas tube fires, grounding Tip and Ring.

2-4

2.7.1 PROTECTION GUIDELINES

Follow these guidelines for grounding and lightning protection. Each Repeater instal l ati on si te is dif ferent; all of these may not apply.

1. Ensure that ground connections make good metal-

to-metal contact (grounding rod, grounding tray, metal conduit) using #6 ga uge solid wi re or braid ed wire straps.

2. With surge protectors, ensure that ground wires go

directly to ground, and not through other equipment.

3. Run the ground wire for RF coax prote ctors directly

to ground.

4. With coax protectors, ensure maximum instanta-

neous voltage does not exceed the rated voltage.

INSTALLATION

5. Do not run ground wire s parallel t o any other wir ing

(e.g. a ground wire parallel to a telephone line), except other ground wires.

6. Double check all equipment for good ground and

that all connections are clean and secure.

2.8 UNPACKING AND INSPECTION

E.F. Johnson ships the Repeater securely crated for transportation. When the Repeater arrives, ensure the crates remain upright, especially if storing the crates tem porarily.

When unpacking the Repeater, check for any visible damage or problems caused by shipping. If there is obvious damage from shipping mishaps, file claims with the carrier. If there appears to be any damage caused before shipping , file a claim with E.F. Johnson. Contact Customer Service for assistance (see Section

1.7).

If everything appears undamaged, remove the Repeater equipment from the crate, using normal precautions for unpacking.

TX COMBINER

DUPLEXER

RX MULTICOUPLER

POWER STRIP

Figure 2-4 RACK MOUNTED REPEATERS

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August 2000

INSTALLATION

T/R ANTENNA

RECEIVER 1

RECEIVER 2

RECEIVER 3

RECEIVER 4

RECEIVER 5

RECEIVER

MULTICOUPLER

PREAMPLIFIER

Figure 2-5 5-CHANNEL COMBINING SYSTEM

NOTE: Do not discard the packing materials. If you must return an item; use the same packing materials and methods (including static protective bags for circuit cards) to repack the equipment. You are responsible for proper repacking. E.F. Johnson cannot be responsible for damage to equipment caused by negligence.

NOTE: Repeaters should not touch, leave a minimum of one empty screw hole (appr oxi m at el y 1/2 ") bet w een repeaters vertically especially for bottom ventilation slots in high power repeaters.

TRANSMITTER 1

DUPLEXER

TRANSMITTER 2

BANDPASS

FILTER

TRANSMITTER

COMBINER

TRANSMITTER 3

TRANSMITTER 4

TRANSMITTER 5

sion) that connects to a HSDB that is also servicing LTR 1010 repeaters, other VIKING VX repeaters that use VIKING VNC cards, or an ID Validator must also use the adapter module. The BNC Adapter Module is installed on the back of the VIKING VX repeater cabinet (see Figure 2-13).

Systems constructed onl y wit h LTR VIKING VX repeaters that have Version 202 or later HSDB software and do not use VNC cards can be connected directly to the HSDB from the RJ-11 jack on the back of the repeater.

NOTE: Each repeater should be grounded separately by connecting a ground bus from the g r o und lu g o n the back side of the RF module to the ground bar on the rack (see Figure 2-8).

2.9 REPEATER DATA BUS INSTALLATION

VIKING VX repeaters with Hig h Speed Dat a Bus (HSDB) sof tware Version 201 or earlier (reference U14 label) installed on the MPC board must use the optional RJ-1 1 to BNC Adapter Module (see Table 1-1 and Figure 2-9) to connect the HSDB. Any VIKING VX repeater (regardless of the HSDB software ver-

August 2000 Part No. 001-2001-200

2.9.1 MPC DA TA BUS SWITCH SETTINGS

Switch settings on the MPC for the two types of installations require S2 and S3 sections to be switched as indicated in Figures 2-10 through 2-13.

2.9.2 MPC DATA BUS JUMPER SETTINGS

Refer to Figure 2-6 for crystal selection and HSDB Code selections jumper placement. The jumper on J5, pins 2-3 select s 12 MHz crystal for LTR. The jumper on J4, pi ns 3-4 conne cts EP ROM U14, pin 27 (A14) to +5V for LTR single-ended 5V data bus.

2-6

Figure 2-6 RJ-11 TO BNC MPC JUMPERS

231J5

123

HSDB CODE SELECTION

CRYST AL SELECTION

6 5

HSDB CODE SELECTION

CRYSTAL SELECTION

INSTALLATION

GROUND

Jumper J4 must be placed with the following

guidelines (see Figure 2-6):

J4, pins 3-4 for operation with the RJ-11 to BNC adapter module and mixed systems (20x1 and 1100) with any version of HSDB software.

J4, pins 3-4 for operation with the RJ-11 to BNC adapter module with 2008 only systems with any version of HSDB software.

J4, pins 5-6 for operatio n wit h the RJ-11 to RJ-11 cable with 2008 only systems wit h Version 202 or later HSDB software.

Figure 2-8 ANTENNA CONNECTIONS

BLU

BLK

GRN

YEL

ORN

RED

PIN 5 HSDB-

PIN 1 TLA-

PIN 3

IRDB-

PIN 6

HSDB+

PIN 2 TLA+

PIN 4

IRDB+

Figure 2-7 RJ-11 TO RJ-11 MPC JUMPERS

2.10 CONNECTING RECEIVE AND TRANSMIT

tions are shown in Figure 2-8. Although each transmitter and receiver could be connected to a separate antenna, this is usually not done because of the large number of antennas required by a multiple repeater installation. Therefore, an antenna combining system is usually used. An example of a combining system for a five-channel system is shown in Figure 2-5. The amount of power loss introduced by a combiner depends on the type of combiner used. If it has a loss of 3 dB, power output to the antenna is reduced by half.

ANTENNAS

Receive and Transmit antenna connector loca-

Figure 2-9 RJ-11 TO BNC ADAPTER MOD-

ULE

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Part No. 001-2001-200

PIN 1 ORN PIN 2 BLK PIN 3 RED PIN 4 GRN PIN 5 YEL PIN 6 BLU PIN 7 GRY PIN 8 BRN

August 2000

INSTALLATION

MPC SWITCHES

ON21876543ON2143

Figure 2-10 SINGLE REPEATER INSTALLATION

MPC SWITCHES

2143

8765

August 2000 Part No. 001-2001-200

MPC SWITCHES

2143

Figure 2-11 TWO REPEATER INSTALLATION

8765

2-8

MPC SWITCHES

END REPEATER

INSTALLATION

8765

MPC SWITCHES

MIDDLE REPEATERS

143

8765

MPC SWITCHES

END REPEATER

143

876

Figure 2-12 THREE OR MORE REPEATERS INSTALLATION

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Part No. 001-2001-200

INSTALLATION

MPC SWITCHES

143

LOGIC

RECEIVER

EXCITER

876

MPC SWITCHES

143

ID VALIDATOR

OPTIONAL

765

50 OHM

TERMINATION

50 OHM TERMINATION

LOGIC

RECEIVER

MPC SWITCHES

143

Figure 2-13 MIXED VIKING VX AND CR1100 REPEATER INSTALLATION

August 2000 Part No. 001-2001-200

EXCITER

2-10

SECTION 3 SOFTWARE

SOFTWARE

3.1 INTRODUCTION

The Johnson 2000 Repeater Program on 3.5 inch disk, Part No. 023-9998-390, uses an IBM



personal computer to program the EE PROM Memory in the Main Processor Card (MPC). To lessen the chance of programming errors and simplify operation, the program uses yes/no questions or toggles through the available responses.

The computer is connected directly from the serial card to the MPC. The interconnect cables used are shown in Figure 4-29. The DB-9 t o 8-pin modular adapter is connected to the serial port of the computer and an interconnect cable connects the adapter to the MPC.

NOTE: These connections are for the IBM computer and may differ from an IBM compatible. In whic h case, consult the manuals for your computer for serial card outputs and connections.

3.1.1 HOW TO USE THIS MANUAL

This manual introduces the program and illustrates how to use the features. This m anual is organized to easily fi nd programming information wi th the Table of Contents, Index and Parameter Tables for the responses required for programming.

Graphic reproductions of the screens are shown for reference. Adjacent to the screens are tables to provide the paramete rs, availa ble respon ses and a bri ef description of the parameter. It is not the intent of th is manual to teach computer operation, but to allow the user to become familiar with the available screens and the responses without having to be at the computer.

3.1.2 GETTING STARTED

Follow the computer ins tructions for loading the disk. The MS-DOS Revision 2.0 or later operating system is needed to run the programs. The computer needs to have RS-232C capability, for example, the Serial Card in slot "COM1" or "COM2".

3.1.3 COMPUTER DESCRIPTION

The programming software is designed to run on an IBM PC or compatible computer that me et the following minimum requirements.

1. One 3.5" high density disk drive.

2. 640K of memory

3. MS-DOS version 2.0 or higher

4. One serial port

5. Monochrome or color monitor and video card

Although the program uses color to highlight certain areas on the screen, a monochrome (black and white) monitor or LCD laptop also provide satisfactory operation. Most video formats such as EGA and VGA are supported. A serial port is required to connect the Repeater to the computer. This port is standard with most computers.

The cables from the Repeater to the computer are not included. With most computers, the adapter-tocomputer cable is a standard DB-25 M-F cable, PN 023-5800-017, (the male connector plugs into the adapter). If your computer requires a male connector, a male-to-male cable is also available, PN 023-5800-

016. The cable from the adapter to the Repeater has a modular-type 8-pin connector (see Figure 4-29).

NOTE: Before starting you should a lready k now how to start MS-DOS



, format and make backup copies of disks, copy and delete files, and run programs. If you are unfamiliar with any of these actions, refer to the MS-DOS manual for your computer for more information (see Section 5-1).

3.1.4 EEPROM DATA STORAGE

The data pr ogrammed into the MPC is stored by an EEPROM Memory. Since this type of device is nonvolatile, data is stored indefinitely without the need for a constant power supply. A repeater can be

August 2000

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Part No. 001-2001-200

SOFTWARE

removed from the site or even stored indefinitel y without affecting prog ramming. Since EEPROM Memory is also reprogrammable, a new device is not nee ded if programming is changed.

3.1.5 COMMAND LINE OPTIONS

HELP

To show all options available from the command line type: /h or /?. Either ’/’ or ’-’ can be used. For example: 2004pgmr /h

The options can be entered in any order. For example: 2004pgmr /d /b /c

COM PORT

The Johnson programming software defaults to serial port COM1. However, if this port is already in use, the software ca n be re configured to use ser ia l p ort COM2. To do this, use one of the following methods:

1. When running the compiled (.EXE) version, type /

c2 on the command line after the program name. For example: 2004pgmr /c2 or -c2

2. Select COM port from Utilities heading.

BAUD RATE

The software defaults to 9600 ba ud, however this rate can be changed. To do this from the command line, type /bxxxx (xxxx = baud rate). For example: 2004pgmr /b or -b

NOTE: When the baud rate is changed on the command line, the baud rate jumpers on J3 in the MPC must also be changed to the same baud rate (see Section 6.10.8).

DEMO MODE

3.1.6 COLOR OR MONOCHROME OPERA TION

The program ming software utilizes color for a color monitor and video card. However, with LCDtype displays, this may make some in format ion hard to read because the cont rast is p oor. To improve contr ast, a monochrome mode can be selected in the display mode from Utilities heading.

3.2 REPEATER PROGR AM SOFTWARE

3.2.1 INSTALLING THE SOFTWARE

When you receive the programming software, make a backup copy and store the master in a safe place. Copy the distribution disks using DOS DISKCOPY command. For example, type:

DISKCOPY A: A: (single floppy drive)

DISKCOPY A: B: or C: (multi-drive systems).

If you have a hard disk drive, you may want to create one or more separate directories for transceiver programming and then transfer the program disk files to those directories. To create a new directory, use the MKDIR command. For example, to create directory RADIOPRG, type:

MKDIR \RADIOPRG.

Then to make the new directory the current directory, use the CHDIR command. For example, to change to the \RADIOPRG directory, type

To view the screens for Read Setup Parms and Write Setup Parms from the Transfer menu when a repeater is not conne ct ed to t he comput er thi s opti on is used. Normally these screens are not available without a repeater connected. To do this from the command line, type: /d or -d. For example: 2004pgmr /d

August 2000 Part No. 001-2001-200

CHDIR \RADIOPRG.

To copy all files from a floppy disk in drive A: to this directory, type:

COPY A:*.*

3-2

SOFTWARE

If you have a single floppy drive an d no hard di sk drive, you need to create programming disks. The reason for this is that there is not adequate space on the backup disk(s) for storing radio files. If your computer has dual floppy disk drives, the backup disk can be placed in one drive and then the radio files stored on a disk in the second drive.

T o make a pro gramming di sk, format a blank disk using FORMAT B: or FORMAT B: /S (use "/S" if it must be a bootable disk). Then copy the required program file or files to the pro gra mmi ng di sk. To do this, type COPY A:(filename .ext) B:(filename.ext). For example, to copy the file 2004pgm2.exe from drive A to drive B, type

COPY A:2004pgm2.exe B:2004pgm2.exe

This procedure works for either single or dual drive computers. Refer to your computer reference manual for more information on these DOS commands.

The programming software is shipped in a compressed format. The name of the compressed file is 2000pgm2.exe and it extr acts the fo llowing fi les so the program can be used on a PC.

VHF_PGMR.EXE 488K VHF_PGMR.HLP 46K VHF12LMN.HLP 2K VHF_PGMR.LNF 181K VHF12HMN.LNF 11K VHF12LMN.LNF 278K VHF12LUS.LMF 59K VHF25HMN.LNF 11K VHF25LMN.LNF 270K VHF25LUS.LMF 62K

The 2004PGM2.EXE file is self ex tr act i ng which means that the files extract automatically when executed. To extract these files so the program can be used, first make the current directory the destination directory for these files. For example, to make it t he \RADIOPRG directory on drive C: (if not the current directory), type C: (Retur n) and then CD \RADIOPRG as just described. To make it the disk in drive B:, simply type B:. Then insert the program disk in drive A: and type A:2004PGM2 (or B: 2004PRM2 if drive B: is being used). The program files are automatically extracted into the current directory or disk.

3.2.2 MINIMUM FREE MEMORY REQUIRED

Approximately 560K of free conventional memory is required to run this pr ogram (us e the CHKSK or MEM command to display the amount of free memory). If you have at least 640K of memory and not enough is available, there may be other programs that are also being loaded into conventional memory. Contact Customer Service for information on how these programs can be moved or disabled to make more space available.

3.3 REPEATER PROGR AMMER

When the program is loaded into the computer and executed, the menu shows the files available from the directory. The program is used to create, edit, transfer and receive the repeater and channel parameters descri bed in Sectio n 5.

IMPORTANT

The commands and displays referred to in this manual are for the IBM PC and may differ from IBM compatible. Refer to the computer’s operating system manual for command explanations.

3.3.1 PROGRAM FILES

The files in the software directory are needed to run the program.

3.4 ALIGNMENT SOFTWARE

File Edit Transfer Hardware Test Utilities

PA Receiver Exciter Full Rptr/Station RNT Interface Telephone Interface

VNC Interface

Figure 3-1 REPEATER TEST MENU

The software for the VIKING VX repeater programs the MPC to open and close the audio/data gates necessary for the ali gnment selecte d from the Test-Full

3-3

August 2000

Part No. 001-2001-200

SOFTWARE

Repeater menu. Under the menu heading Test are the alignment procedures for the PA (see Section 7.3), Receiver (see Section 7.1), Exciter (see Section 7.2) and overall Full Repeater (see Section 7.4) including the MAC card (see Figure 3-1).

Refer to Section 7 for Alignment Procedures as shown in the program, alignment points diagrams and test setup d iagrams.

HELP - F1

FILE

Load Save Save As Print Config DOS Shell About... Quit ALT X

3.5 HELP F1

Help screens are available for most parameters and options in this progr am. Whenever a pa rameter or options clarification is needed, press F1 and if a help screen is available it will pop-up on the screen. Press Escape <E SC> to exit th e pop-up scre en.

Setup Parameters F4 Select Repeater

EDIT

TRANSFER

HARDWARE

TEST

UTILITIES

Figure 3-2 PROGRAMMING FLOWCHART

Alarm Configuration Repeater Type Delete Repeater

Read Setup Parms F5 Write Setup Parms F6

RF Data Revisions

PA Receiver Exciter Full Rptr/Station

COM Port Display Mode Alarm Display User Level

August 2000 Part No. 001-2001-200

3-4

SECTION 4 PULL DOWN MENUS

PULL DOWN MENUS

4.1 MENU DISPLAYS

The menus available are listed at the top of the screen (see Figure 3-2). Move the cursor with the arrow keys to highli ght the men u name. Pres s Enter to view the menu and the arrow keys to scroll through the menu. Call up the highlighted selection by pressing Enter.

4.2 FILE MENU

This menu manipulates new or existing files into directories and saves files to be called up at another time.

Figure 4-1 FILE MENU

4.2.1 LOAD

Load reads information from a stored file. The program requests the filename to be loaded into the buffer. The filename from a disk can be entered in the highlighted area. Then move the cursor d own with the arrow key and highlight "Ok" and press Enter. To select an existing file, use the arrow keys to move down the menu list and press Enter when the highlighted file name is the file to load.

4.2.2 SAVE

This saves the edited ve rsion of an existing file loaded in the buffer under the same filename in the directory a nd deletes the old file. It loads a new file created in the Edit menu into the directory.

4.2.3 SAVE AS

This saves the edited ve rsion of an existing file loaded in the buffer under a new filename o r gives a new file created in the Edit menu a filename.

Dir c:\example\file\load File *.qx

file1.qx

Ok Cancel

Load File

..\ tmp\

Figure 4-2 LOAD FILE

4-1

Dir c:\example\file\load File *.qx

test.qx

Ok Cancel

Save File

..\ tmp\

Figure 4-3 SAVE FILE

Part No. 001-2001-200

August 2000

PULL DOWN MENUS

4.2.4 NEW

This menu selection erases all Site and Repeater information in the programmer and loads factory defaults. If the current data has been changed, selecting File -> New provides the opportunity to save the data before loading the defaults.

4.2.5 PRINT REPEATER CONFIGURATION

Select the destination for the configurations. Printer - Prints to printer connected to P C. File - Writes printable test to selected filename.

Select which repeater data will be printed.

All Repeaters - Prints the data for all valid repeaters. Single Repeater - Prints the data for th e entered repeater number.

NOTE: A list of valid repeaters can be seen under the Edit-Select Repeater menu selection.

4.2.6 DOS SHELL

DOS shell temporarily suspends the program and returns to DOS. Directories and other DOS commands can be performed. To return to the program from DOS, type EXIT and press Enter.

4.2.7 QUIT (ALT X)

Quit exits t he repeater program and returns to DOS. Save all files before exiting the repeater pro gram.

EDIT

Setup Parameters F4

Select Repeater

Alarm Configuration

Repeater Type

Delete Repeater

Repeater Number Receive Frequency Transmit Frequency Frequency Step

TELCO Network Type Area Sync Repeater

Stand Alone CWID Time CWID Message

Local Mic ID Test Mode ID

RF Power Level

Power Source Paging Data Modem

Default Repeater Number

Input Alarms Output Alarms Cross Reference

Repeater Type

Channel Bandwidth

Frequency Range

Input Type Selection Output Type Selection Alarm Cross Reference Selection

Multi-Net LTR Universal Station UHF VHF Universal Station

12.5 kHz 25 kHz

132-150 MHz 150-178 MHz 370-480 MHz 480-512 MHz

Figure 4-4 EDIT PROGRAMMING FLOWCHART

4-2

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Part No. 001-2001-200

PULL DOWN MENUS

4.3 EDIT

Figure 4-5 EDIT MENU

This menu is used to create new files and set or change the repeater operating parameters. The filename for the repeaters in th is file is shown in the lower left corner of the screen.

4.3.1 SETUP PARAMETERS

First see Section 4.3.4 to select repeater type to setup LTR Parameters. This menu programs the repeater parameters and options of each repeater at a site. Table 5-1 lists the parameters that are set by this screen (see Figure 5-1) and giv es a brief desc ription of each.

NOTE: The parameters are shown in the lower left of the pop-up screen for reference.

Repeater Number

Each repeater is programmed with a repeater number from 1-20. Make sure t hat t his nu mber agrees with the Home repeater number programmed in the mobiles assigned to this repeater.

Receive/Transmit Frequency

Each Repeater is programmed with a Transmit and Receive frequency that it is operating on.

Frequency Step

Using the space bar, select either: 5000 Hz or 6250 Hz for allowable frequency spacing.

To eliminate the chance of incorrect synthesizer settings arising from ambiguous frequ enc ies , make sure this setting is correct.

Telco Network Type

None is used for LTR system repeaters.

Area

This is the same as the area bit used when programming the mobiles. This bit is usually "0".

Sync Repeater

None is used for LTR system repeaters.

Stand Alone

Select if the repeater is not connected to additional repeaters via the high speed data bus.

ID Validator (No t applicable at this time .) CWID Time

The time interval between transmission of the repeater’s CWID message.

CWID Message

FCC regula tions require that the stat ion call letters be transmitted periodically on the lowest- frequency repeater in the system and disabled on all the others. Morse code is used to encode these letters/ numbers for continuous-wave (CW) transmission (15 characters /numbers UPPER CASE).

Local MIC ID

The local microphone connected to the MAC jack is assigned a Group ID for transmitting when the local microphone PTT is active. This allows the Repeater to operate as a base station.

Test Mode ID

This Group ID is transmitted when the Repeater is in T es t Mode. Mobi les with th e same Group ID can communicate with the Repeater in Test Mode.

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Part No. 001-2001-200

PULL DOWN MENUS

Repeater List default Rptr 1

-------

------Rptr 30

RF Power Level

This is the d efault power level. Enter the power

level for transmit power.

NOTE: This is not the actual power out level. Other factors must be considered for true power out.

Power Source

This indicates the primary power source for the Repeater (AC/DC). If AC is selected and Battery Backup is installed, the transmitter goes to half rated power (max.) when AC fails. If DC is selected and AC fails, power output is unchanged.

Select Which Alarms To Edit Input Alarms Output Alarms Cross Reference

Figure 4-7 ALARM CONFIGURATION

Input Alarms

There are four input alarms that can be activated by external devices (see Section 6.12). These inputs can be disabled, energized or de-energized. Alarms 3 and 4 can also be analog input.

Data Modem

This is selected if the Data Modem option is installed. This option is not compatible with Paging, TIC, or VNC.

4.3.2 SELECT REPEATER

Select the repeater number to be programmed or edited from the pop-up menu (see Figure 4-6). Move the cursor with the arrow keys to highlight the repeater number and press Enter.

Figure 4-6 REPEA TER LIST

If the input is disabled , the input ala rm line is inactive. When energized and current flow is detected, the alarm is activated. When de-energized and no current flow is detected, the alarm is activated. Analog inputs prov ide a det ect i on of an analog input out of limit condition. Select the Low and High Limit pair to trip an Analog Input Alarm. The High Limit must be greater in value than the Low Limit (0.0V-5.0V in 0.1V steps).

Input Alarm Configuration

Input Type Selection Description

Alarm 1 Input Type: Energized Alarm 2 Input Type: De-Energized Alarm 3 Input Type: Analog Alarm 4 Input Type: Analog Low Limit Vol tage (Input3): 1.6 Volts High Limit Voltage (Input3): 2.5 Volts Low Limit Voltage (Input4 ): 0 Volts High Limit Voltage (Input4): 1.5 Volts

Spacebar

Door 1 open Door 2 open Fuel Tank 1/2 Fuel Tank 1/4

Figure 4-8 INPUT ALARMS

4.3.3 ALARM CONFIGURATI ON

This programs the input alarm (see Figure 4-8) and output alarm (see Figure 4-9) configurations and provides a cross reference screen.

Use the arrow keys to move down the list. Use the Space bar to toggle through the parameters: Disabled, Active Low, Active High, for each alarm.

August 2000 Part No. 001-2001-200

Output T ype Selection

Select the operation of the Output Alarm. The

available types are:

Active Open - An active alarm opens (no contact) the output lines.

Active Closed - An active alarm closes (contact) the output lines.

4-4

PULL DOWN MENUS

Output Alarm Configuration

Output Type Selection Tx ID

Alarm 1 Output Type: Active Open Alarm 2 Output Type: Active Open Alarm 3 Output Type: Active Open

Alarm Tx Rate: 0

Press F2 to Accept

Spacebar

Description

DOOR OPEN FUEL 1/2 FUEL 1/4 RF HALF POWERAlarm 4 Output Type: Active Closed

120 120

Figure 4-9 OUTPUT ALARMS

Alarm Description

This is a tex t string (up to 15 characte rs) to describe the alarm. This test string is sent via Morse code if the alarm input is programmed with a Tx ID and an output is selected in the cross reference menu (see Figure 4-10).

Transmit ID

Each of the 8-alarm outputs can be assigned a Group ID from 1-225. The default setting is 0 (zero) for disabled. This Group ID and th e Repe ater number identify an alarm that is active. This ID can be programmed into a transceiver so that when the alarm is active, the alarm description is received in Morse code.

Alarm Cross Reference Selection

Select which Output Alarm is activated by each Input Alarm.

0. None

1. 1

2. 1

3. 2

4. 3

5. None

6. None

7. None

8. None 24. None 32. None 40. None

9. None

10. None

11. None

12. None

13. None

14. None

15. None

16. None

17. None

18. None

19. None

20. None

21. None

22. None

23. None

Press F2 to Accept

25. None

26. None

27. None

28. None

29. None

30. None

31. None

33. 4

34. None

35. None

36. None

37. None

38. None

39. None

41. None

42. None

43. None

44. None

45. None

46. None

47. None

Figure 4-10 ALARM CROSS REFERENC E

4.3.4 REPEATER TYPE

This screen (see Figure 4-11) selects the repeater

type (LTR signaling protocol and features):

Repeater Type VHF Channel Bandwidth 12.5/25 kHz Frequency Range 132-150/150-178 MHz

Alarm Transmit Rate

This sets the time interval for transmitting the alarm message in Morse code. If more than on e alarm is active, this is the inter-alarm time.

Cross Reference

The cross reference screen selects the output alarm that is activated by each input alarm. There are up to 48 alarms (0-47), 8 external input alarms and 40 internal alarms (s ee Table 1-2). There are eight output alarms. An alarm condition on any input can cause an output alarm. This screen configures which input alarm activates an out put alarm.

NOTE: More than one alarm condition can have the same output alarm (see Figure 4-10).

Figure 4-11 REPEATER TYPE

4.3.5 DELETE REPEATER

Select Rptr To Delete Rptr 1

Figure 4-12 DELETE REPEATER

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Part No. 001-2001-200

PULL DOWN MENUS

Program Rptr 1

Ok Cancel

4.3.6 TELEPHONE PA RAMETERS

Refer to the Telephone Interface Card manual, Part No. 004-2000-370, for information on the Telephone Access Parameters, Telephone Interface and TIC Calibration Data.

4.4 TRANSFER

File Edit Transfer Hardware Test Utilities

Read Setup Parms F5 Write Setup Parms F6 Read TIC Calibration Data Write TIC Calibration Data

Edit Option Keys

Figure 4-13 TRANSFER MENU

4.4.1 WRITE SETUP PARAMETERS

Programming Setup Par am eters

Count = 1

Figure 4-15 PROGRAM WRITE SETUP

4.4.2 READ SETUP P ARAMETERS

This command reads the contents of the EEPROM mem ory of a repeater and loads it into a buffer. The contents of the buffer is then displayed to show the programming of the repeater.

Read Setup Parms?

Ok Cancel

This command sends the contents of a file to the repeater and programs the EEPROM memory in the Main Processor Card (MPC ).

Figure 4-14 WRITE SETUP PARAMETERS

HSDB Monitor

HARDWARE

RX/TX Data

RF Data

Revisions Mode Select TTY Terminal

Figure 4-16 READ SETUP PARAMETERS

Reading Setup Parameters

Attempting access to Repeater

Figure 4-17 READING SETUP

Repeater (1-20) Home UID GoTo GID

Data Received From Radio Data Transmitted to Radio

RF Line Monitor

Normal Test

UID Home GID Pri Stat Time

August 2000 Part No. 001-2001-200

Figure 4-18 HARDWARE PROGRAMMING FLOWCHART

4-6

PULL DOWN MENUS

4.5 HARDWARE

Figure 4-19 HARDWARE MENU

4.5.1 HSDB MONITOR

High Speed Data Bus (HSDB) connects all repeaters at a site and cont inu ally sen ds update s on the status of each repeater. This information screen provides a list of all repeaters at the site (1 to 20). If a repeater is not sending data, IDLE is next to the repeater number. The data sent by the repeater is used to determine the Home, GID and UID of destination (mobile) users to receive the call placed by the originator.

The Home column refers to the Home repeater number of the originator, therefore the Repeater number and the Home number may not be the same number. The UID is the Unique ID used to identify the originator of special calls. The GID column refers to the Group ID of the talk group of the originator (236=UID Call, 237 Telco call). The GoTo column shows the repeater channel all destination users switch to so they receive the call.

Rptr Home UID GoTo GID

Figure 4-20 HSDB MONITOR

The repeater receives the destinati on’s: Unique ID, Home Repeater Number, Group ID, Priority, Status and Time Stamp. The information sent to the destination in the update message from the repeater includes: Unique ID of originator, Home Repeater Number, Group ID, GoTo Channel Number, Free Channel Nu mber and Priority of the cu rrent repeate r. The time st amp is included becaus e messages are sent continually and this provides a reference for when a data exchange took place.

UID Home GID Pri Stat Time

Figure 4-21 MOBILE TRAFFIC MONITOR

4.5.3 RF DATA

The A/D Monitor Screen shows the state of the lines (see Figure 4-22). These lines are monitored by the A to D converter in the IAC. The normal values for each line are defined as follows.

Synthesizer Lock Lines Yes or No Forward Power (LP) 25-110 Watts Reflected Power 0-6 Watts Final Out (ratio) approx equal Chassis Temp 27°C-55°C Wideband Audio Output approx 200 LO Injection approx 200 RSSI 20-150 Fan Current 100-200, 0 Fan On or Off Power Supply Temp 22°C-45°C Battery Voltage 21V-28V

4.5.2 RECEIVE/TRANSMIT DATA

This is an information screen used at the repeater site while t he computer (laptop) is connected to the MPC in the rep eater being monitored. This information is contained in the receive data stream exchanged between the repeater and the destination user (mobile) and the data content of the repeater transmit data stream. The message contains data received from the destination and data se nt to the mo bile by the r epeater.

Values with no label are the actual A to D read-

ing. To calculate the voltage on the line, divide the value by 51. Example: Value ÷ 51 = Volts. Any variation from the above values may indicate a problem in that area. Values on this screen are relative measurements only.

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PULL DOWN MENUS

RF Line Monitor

Synthesizer Lock Lines

Exciter Synthesizer: Yes Receive Synthesizer: Yes

Transmit Parameters

Forward Power: 0 Watts Reflected Power: 0 Watts Final Output 1/2: 0/ 0 ratio Final Output 3/4: 0/ 0 ratio

Receive Parameters

RSSI: 0

System Parameters

Fan 1 Current: 0 Fan 2 Current: 0 Fan On: Off Chassis Temp: 0 C

Battery Voltage: 0 Volts

Wideband Audio Output: 0 LO Injection: 0

Power Supply Temp: 0 C

(Not Calibrated)

Exciter High Stability: No Receive High Stability: No

Figure 4-22 RF LINE MONITOR

Repeater Version Display

Repeater Number: 1

HSDB: 2.1d MAC: 1.09 TIC: 0.00

MPC or TPI: 10.12 05/23/95 11 Serial Number: 1234567891234567

Figure 4-23 REVISION/VERSION

4.5.4 REVISION/VERSION

The Revision/Version is displayed for the repeater modules in this screen. The format is R.V (revision.version) for all modules. The MPC information also includes the release date of the software and the serial number of the repeater. The HSDB version in Figure 4-23

and Figure 4-24 is the version for J4, pins 3/4 connected in the MPC.

is for J4, pins 5/6 connected in the MPC

4.5.5 MODE SELECT

The Mode Select screen plac es the repea ter eith er in the Norma l mode or the Test mode. In th e Normal mode the repeater operates as a normal repeater.

In the Test mode the repeater transmits a test word. This test word is the Test Mode ID setup in the Setup Parameters (see Section 4.3.1

C A U T I O N

Repeater Version Display

Repeater Number: 1

HSDB: 50.02 MAC: 1.09 TIC: 0.00

MPC or TPI: 10.12 05/23/95 11 Serial Number: 1234567891234567

Figure 4-24 REVISION/VERSION

While in the test mode the repeater is "busy", therefore it is important to place the repeater in Normal mode when the test mode is no longer required.

August 2000 Part No. 001-2001-200

4-8

TEST

PA Receiver Exciter Full Rptr/Station RNT Interface Telephone Interface

All Test Repeater Setup Transmitter Tests Receiver Tests Transmit Audio/Data Voter Audio Adjust Audio/Data Adjust Repeater Operat ion

Select Line Type Adjust Links

PULL DOWN MENUS

Frequency Adjust Power Output Adjust

All Receive Tests TCXO Frequency Adjust Audio Distortion Hum & Noise Measurement SINAD Measurement Squelch Adjust Data Level Adjust Local Speaker/Mic Desense Check Miscellaneous Tests

All Transmit Tests Audio Deviati o n Lim i t Repeat Audio Level Data Level Adjust Audio/Data Deviation CWID Level Check Local Speaker/Mi c Tx Hum & Noise Ratio Transmit Audio Distortion LTR Mod em

All Audio/Data Tests Voice Audio From Repeater Voice Audio To Repeater FSK Data To Rptr (Separate Path) FSK Data To Rptr (Over Voice Path) FSK Data From RNT (Separate Path) FSK Data From Rptr (Over Voice Path) RS-232 Setup

All Operational Tests New HSDB Test Old HSDB Test Handshake Test Alarm Test Spurious Check

Data Over Voice (2-Wire) Separate Data (4-Wire) RS-2332

Figure 4-25 TEST PROGRAMMING FLOWCHART

4.6 TEST

Figure 4-26 TEST MENU

4.6.1 POWER AMPLIFIER

This menu selection walks through the alignment of the Power Amplifier and RF Interface Board on the computer screen. Refer to Section 7.3 for the PA and RFIB alignment in this manual and Figures 7- 3 and 7-8 for alignment points diagrams.

4.6.2 RECEIVER

This menu selection walks through the alignment of the receiver on the computer screen. Refer to Section 7.1 for the Receiver alignment i n this manua l and Figure 7-1 for an alignment points diagram and Figure 7-6 for a test setup of the Receiver.

4.6.3 EXCITER

This menu selection walks through the alignment of the Exciter on the computer screen. Refer to Section 7.2 for the Exciter alignme nt and Fi gure 7-2 for an alignment points diagram and Figure 7-7 for a test setup of the Exciter.

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PULL DOWN MENUS

4.6.4 FULL REPEATER

This menu selection walks through the alignment of the entire repeater. The Receiver and Exciter portions are performance tests and adjustments. The Audio and Data portions are level adjustments for the Main Audio Card (MAC). Refer to Figure 7-12 for an alignment points diagram for the MAC.

4.7 UTILITIES

Figure 4-27 UTILITIES MENU

4.7.1 COM PORT

This is the COM port used to send and receive data from the Repeater MPC. An interface cable connects the Repeater to the computer (see Figure 4-29). This screen also selects the data baud rate.

4.7.2 DISPLAY MODE

This screen allows the color mode to be selected for color monitors. When using a la ptop, monochrome is recommended for better resolution.

Figure 4-30 COLOR MODE SELECTION

4.7.3 USER LEVEL

There are two levels to choose from, Novice and Advanced. The Novice uses prompts in the EditParamete rs screens wh en Escape or F2 keys are pressed that ask "are you sure" before the task is executed. The Advanced selection performs the task without asking the question.

Figure 4-28 COM PORT SELECTION

TO MPC

TO LAPTOP

Figure 4-29 LAPTOP INTERCONNECT CA-

BLE

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4-10

REPEATER PROGRAMMING

SECTION 5 REPEATER PROGRAMMING

5.1 CREATING A NEW FILE

An example will be used to show the program-

ming for a new file created for Site 1.

NOTE: At any point in the programming sequence, if F1 is selected, a help screen appears to explain the menu selection highlighted at that point.

5.1.1 SELECT REPEATER TO EDIT

A repeater is selected to program. When no file exists with programmed repeaters, the default is selected and edited.

1. Highlight EDIT, press Enter.

2. Highlight SELECT REPEATER, press Enter.

3. Default is the only repeater in this list, press Enter.

4. Highlight EDIT, press Enter.

13.Type in a valid DOS filename. For this example site1.dat i s used.

14.The file consists of default and repeater one under the filename of site1.dat.

5.2 ADDING A REPEATER TO A FILE

The example used fo r Si t e 1 will again be used t o

add repeaters to the filename site1.dat.

1. Highlight EDIT, press Enter.

2. Highlight SELECT REPEATER, press Enter.

3. The repeater list shown for this file includ es defaul t and repeater one. These contain the same parameters with the exception that when selected for edit the programmed repeater can be over written and the data lost.

4. Highlight DEFAULT, press Enter.

5. Highlight SETUP PARAMETERS, press Enter.

6. The Setup Parameters sc reen ap pears (see Fi gure 5 -

1). Fill in the parameters for this repeater. A brief description of the parameters is in Table 5-1. Full descriptions are in Section 4.3.1.

7. Select parameters, press F2 to accept.

8. Highlight EDIT, press Enter.

9. Highlight ALARM CONFIGURATION and press Enter, if alarms are to be configured.

10.Program the Alarms to be configured (see Section

4.3.3), press F2 to accept.

11.Highlight FILES, press Enter.

12.Highlight SAVE, press Enter.

5. Highlight EDIT, press Enter.

6. Highlight SETUP PARAMETERS, press Enter.

7. Change the Repeater number and other parameters as required for this repea ter, press F2.

8. Highlight EDIT, press Enter.

9. Highlight ALARM CONFIGURATION and press Enter, if alarms are to be configured.

10.Program the Alarms to be configured (see Section

4.3.3), press F2 to accept.

11.Highlight FILES, press Enter.

12.Highlight SAVE, press Enter.

13.Repeater 2 is added to the Repeater List in file site1.dat.

5-1

August 2000

Part No. 001-2001-200

REPEATER PROGRAMMING

Table 5-1 REPEATER SETUP PARAMETERS

Parameter Response Description

Repeater Number 1-20 Each repeater is assigned a Home Repeater number from 1-20. Channel Frequency Rx:

Tx: Frequency Step 5 kHz or 6.25 kHz Allowable frequency spacing. Telco Network Type None

FSK

RS232

FSK Blank & Burst

TIC

VNC Area 0, 1 Same as value of the Area bit in the mobiles. Sync Repeater No Not used. Stand Alone Yes, No Select if the repeater is not connected to additional repeaters

ID Validator Yes, No Not used. CWID Time 0 = disabled

1-60 min CWID Message 15 characters/numbers

UPPER CASE Local MIC ID 0 = disabled (default)

1-250, 253 Test Mode ID 0 = disabled

1-250, 254 (default) RF Power Level 25-110 Power level in watts for transmit power. Power Source AC or DC The type of primary power source for the Repeater. Data Modem Yes, No Select if the Data Modem option is installed.

Each repeater is programmed with the transmit and receive frequency that it is operating on.

None=LTR dispatch only. Data signaling type for a Switch, FSK, RS232 or FSK B&B.

TIC is for Telephone Interface Card w/o a Switch. VNC=network telephone interconnect w/o a Switch.

(via HSDB).

Time between CWID transmissions.

Station call letters.

Group ID transmitted when the local microphone PTT is active.

Group ID transmitted when the Repeater is in the Test Mode.

Repeater Number: 1 Rcv Frequency: 158.145000 Xmit Frequency: 153.095000 Frequency Step: 5000 Hz

Sync Repeater: No Stand Alone: Yes ID Validator: N/A

Local MIC ID: 0 Test Mode ID: 254

Paging: No

Repeater Home (1-20)

August 2000 Part No. 001-2001-200

LTR Repeater Setup Parameters Edit

Telco Network Type: None Area:

CWID Time: CWID Message:

RF Power Level: Power Source:

Data Modem:

Press F2 to Accept

Figure 5-1 SETUP P ARAMETERS

5-2

REDHAWK

110 AC

SECTION 6 CIRCUIT DESCRIPTION

CIRCUIT DESCRIPTION

6.1 RECEIVER

6.1.1 INTRODUCTION

The receiver is a double conversion type with intermediate frequencies of 52.95 MHz and 450 kHz. The first injection frequency is phase locked to a temperature compensated crystal oscillator (TCXO) with a frequency stability of ±2.5 PPM from -30° to +60°C (-22° to +140°F). Two 3-pole bandpass filters in the front-end reje ct signal s outs ide the r eceive ba nd. Two 4-pole crystal filters and two 4-pole ceramic filter establish receiver selectivity (see block diagram Figure 6-1).

6.1.2 REGULATED VOLTAGE SUPPLIES

The +15V DC power source is supplied by the repeater power supply. The +15V supply enters the receiver on J201, pin 1. U302 provides the +12V DC receive voltage to the RF and IF amplifiers. U303 supplies +12V DC to the first and second injection amplifiers. U304 supplies +12V DC to the remaining RF circuits. U301 suppli es +6V DC to th e remaining circuits.

6.1.4 12.5 KHZ IF First Mixer and Crystal Filter

First mixer U101 mixes the receive frequency with the first injection frequency to produce the 52.95 MHz first IF. Since high-side injection is used, the injection frequency is 52.95 MHz above the receive frequency. Jumper J203 selects between a 12.5 kHz IF and a 25 kHz IF. Install jumper plug P203 on J203, pins 2-3 to select the 12.5 kHz IF. The output of U101 is matched to Z211 at 52.95 MHz by L211, C236 and C237.

Z211A and Z211B form a two-section, four-pole filter with a center frequency of 52.95 MHz and a

-3 dB bandwidth of 8 kHz. This filter attenuates adjacent channels and other signals close to the receive frequency. The filter sections are a matched pair and the dot on the case indicates which leads connect together. Matching with Q202 is provided by C241, L213 and C240.

6.1.3 HELICAL FILTERS, RF AMPLIFIER

The receive signal enters the receiver on coaxial connector A201. A helical filter consisting of L101, L102 and L103 is a three -pole bandpass filter tu ned to pass only a narrow band of frequencies within the 132-178 MHz band. This filter also attenuates the image and other unwanted frequenci es .

Impedance matching between the helical filter and RF amplifier U103A is provided by C102. U103A amplifies the receive signal to recover filter losses and increases receiver sensitivity. Biasing for U103A is provided by R105/R106/R107/R108 and C105, C106, C107 and C108 provide RF bypass. Additional filtering of the receive signal is provided by 3-pole helical fil ter L108- L110. C103/C104 match the output from U103A to 3-pole helical filter L108L110.

IF Amplifier, Crystal Filter

Q202 amplifies the 52.95 MHz IF signal to recover filter and mixer losses and improve receiver sensitivity. Biasing for Q202 is provided by R236/ R233/R234/R235 and C242/C243/C246 provide RF bypass. The output of Q202 is matched to crystal filter Z212 at 52.95 MHz by C245, C247 and L214.

Z212A and Z212B form a two-section, four-pole filter with a center frequency of 52.95 MHz and a

-3 dB bandwidth of 8 kHz. This filter establishes the selectivity of the receiver by further filtering the 52.95 MHz IF. The filter sections are a matche d pair and th e dot on the case indica tes which leads conne ct together . Matching with U203 is provided by C250, C251, C252, L216 and R237.

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

BANDPASS FILTER

L102/L103/L104

RF IN

A201

RF AMP

U103A

BANDPASS FILTER

L108/L109/L110

MIXER

U101

52.95 MHz 4-POLE CRYSTAL FILTER

Z211A/B

IF AMP

Q202

52.95 MHz 4-POLE CRYSTAL FILTER

Z212A/B

17.5 MHz TCXO

Y401

MULTIPLIER

VOLTAGE MULTIPLIER

Q403, Q404

Q405, CR402

VCO

A006

Q204

BUFFER/AMP

Q131

Q132

RF DATA

RF CLOCK

SYN CS RX

SYN LK RX

SYNTHESIZER

REF IN

U401

V R

F IN

BUFFER

Q401 Q402

CHARGE PUMP

Q406, Q407 Q408, Q409

BUFFER

Q410 Q411

Figure 6-1 12.5 kHz IF RECEIVER BLOCK DIAGRAM

Second Mixer/Detector

As shown in Figure 6-2, U203 contains second oscillator, second mixer, limiter, detector and RSSI circuitry. The 52.95 MHz IF signal is mixed with a

52.5 MHz signal produced by TCXO Y401 and tripler Q204. The 17.5 MHz (±2.5 PPM) output of Y401 is fed through C275 to tripler Q204. The tripler passes the third harmonic at 52.5 MHz to the oscillator input of U203.

OSC B 1

OSC E

MIXER OUT

IF IN

DECOUPLING 1

DECOUPLING 2

QUAD COIL

MIXER

OSC

WITH HYSTER ESIS

Vcc

LIMITER

AMP

SQUELCH TRIGGER

AMP

FILTER

DEMODULATOR

16 MIXER IN

GROUND

MUTE14

RSSI

SQUELCH IN

FILTER OUT

FILTER IN

AMP

AUDIO9

Figure 6-2 U201/U203 BLOCK DIAGRAM

IF DETECTOR/AMP

VCO

U203

Z213/Z214

FIRST SECOND

INJ AMP INJ AMP

Q133

Q134

U204A

AUDIO

U204B

BANDPASS

INJECTION FILTER

L140/L141

RSSI

RX WBAND

AMP

U102

INJECTION

TEST VOLTAGE

Biasing of Q204 is provided by R258, R259 and R260. RF choke L222 blocks the flow of RF through R261. An AC voltage divider formed by C280/C281 matches Q204 to the highpass filter. The third harmonic of the TCXO frequency is then used to drive the OSC B input at 52.5 MHz. L223, C282 and L224 form a high pass filter to attenuate frequencies below

52.95 MHz. C283 and C284 match the output of the filter to U2 03.

The 450 kHz second IF is then fed to ceramic filter Z213/Z214, then into the IF amplifier. The center frequency of Z213/Z214 is 450 kHz with a bandwidth of 9 kHz used to attenuate wideband noise. The limiter amplifies the 450 kHz signal 92 dB which removes any amplitude fluctuations.

From the limiter the signal is fed to the quadrature detector. An external phase-shift network connected to U203, pin 8, shifts the phase of one of the detector inputs 90° at 450 kHz (the other inputs are unshifted in phase). When modulation occurs, the frequency of the IF signal changes at an audio rate as does the phase of the shifted signal. The detector, which has no output with a 90° phase shift, converts the phase shift into an audio signal. Z215 is adjusted to provide maximum undistorted output from the detector. The audio signal is then fed out on U203, pin 9.

August 2000 Part No. 001-2001-200

6-2

CIRCUIT DESCRIPTION

RF AMP

U103A

BUFFER

Q401 Q402

CHARGE PUMP

Q406, Q407 Q408, Q409

BUFFER

Q410 Q411

BANDPASS FILTER

17.5 MHz TCXO

Y401

VOLTAGE MULTIPLIER

Q403, Q404

Q405, CR402

A006

L108/L109/L110

MULTIPLIER

Q204

VCO

BUFFER/AMP

Q131 Q132

RF IN

A201

RF DATA

RF CLOCK

SYN CS RX

SYN LK RX

BANDPASS FILTER

L102/L103/L104

SYNTHESIZER

REF IN

U401

V R

F IN

Figure 6-3 25 kHz IF RECEIVER BLOCK DIAGRAM

Wideband Audio Amplifier

U204B amplifies the detected audio and data signal. R244/R245/R246 set the gain of the amplifier and R247/R248/R249/R250/RT204 provide a DC reference level. C261 bypasses the 450 kHz IF signal and C262 bypasses other frequencies. The output signal is adjusted by R253 and fed to J205, pin 3. Install jumper plug P205 on J205, pins 2-3 to select the

12.5 kHz audio to be routed to J201, pin 9.

RSSI Amplifier

AMPLIFIER

Q203

VCO

MIXER

52.95 MHz 4-POLE

U101

CRYSTAL FILTER

FIRST SECOND

INJ AMP INJ AMP

Q133

Z201A/Z201B

IF DETECTOR/AMP

U201

Z203/Z204

Q134

IF AMP

Q201

INJECTION FILTER

U202A

AUDIO

U202B

BANDPASS

L140/L141

52.95 MHz 4-POLE CRYSTAL FILTER

Z202A/Z202B

RSSI

RX WBAND

U102

AMP

IF and a 25 kHz IF. Install jumper plug P203 on J203, pins 1-2 to select the 25 kHz IF. The output of U101 is matched to the crystal filter at 52.95 MHz by L201, C201 and C202.

Z201A/B fo rm a two-section, four-pole filter with a center frequency of 52.95 MHz and a -3 dB bandwidth of 15 kHz. This filter attenuates adjacent channels and other signals close to the receive frequency. The filter is a matched pair and the dot on the case indicates which leads connec t together. Matching with Q201 is provided by C205, L203 and C206.

INJECTION

TEST VOLTAGE

U203, pin 13 is an output from an internal RSSI (receive signal strength indicator) circuit which provides a current proportional to the strength of the 450 kHz IF signal. The RSSI output is buffered through U204A and the level is adjusted by R221. The DC output signal is then fed to J204, pin 3. Install jumper plug P204 on J204, pins 2-3 to select the 12.5 kHz RSSI to be routed to J201, pin 7.

6.1.5 25 KHZ IF

IF Amplifier, Crystal Filter

Q201 amplifies the 52.95 MHz IF signal to recover filter and mixer losses and improve receiver sensitivity. Biasing for Q201 is provided by R204/ R201/R202/R203 and C207/C209/C211 provide RF bypass. The output of Q201 is matched to crystal filter Z202A at 52.95 MHz by C210, C212 and L204.

Z202A/B fo rm a two-section, four-pole filter with a center frequency of 52.95 MHz and a -3 dB bandwidth of 15 kHz. This filter establishes the selectivity of the receiver by further filtering the

52.95 MHz IF. The filter sections are a matched pair and the dot on the case indicates which leads connect together. Matching with U201 is provided by C215, C216, C217, L206 and R205.

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

Second Mixer/Detector

As shown in Figure 6-2, U201 contains second oscillator, second mixer, limiter, detector and RSSI circuitry. The 52.95 MHz IF signal is mixed with a

52.5 MHz signal produced by TCXO Y401, tripler Q204 and amplifier Q203. The 17.5 MHz (±2.5 PPM) output of Y401 is fed through C275 to tripler Q204. The tripler passes the third harmonic at 52.5 MHz to amplifier Q203. Amplifier Q203 amplifies the 52.5 MHz signal for the oscillator input of U201.

Biasing of Q204 is provided by R258, R259 and R260. RF choke L222 blocks the flow of RF through R261. An AC voltage divider formed by C280/C281 matches Q204 to the highpass filter. L223, C282 and L224 form a high pass filter to attenuate frequencies below 52.95 MHz. C283 and C284 match the output of the filter t o U203. The thi rd ha rmonic o f the TCXO frequency is light ly coupled to amplif ier Q203 th rough C270, R262 and C265. Biasing of Q203 is provided by R254, R255, R256 and R257. The amplified 52.5 MHz output is passed to U201 OSC B input through C271.

The 450 kHz second IF is then fed to ceramic filter Z203/Z204, then into the IF amplifier. The center frequency of Z203/Z204 is 450 kHz with a bandwidth of 15 kHz used to attenuate wideband noise. The limiter amplifies the 450 kHz signal 92 dB which removes any amplitude fluctuations.

RSSI Amplifier

U201, pin 13 is an output from an internal RSSI (receive signal strength indicator) circuit which provides a current proportional to the strength of the 450 kHz IF signal. The RSSI output is buffered through U202A and the level is adjusted by R219. The DC output signal is then fed to J204, pin 1. Install jumper plug P204 on J201, pins 1-2 to select the 25 kHz RSSI to be routed to J201, pin 7.

6.1.6 VCO

The Voltage-Controlled Oscillator (VCO) is formed by Q101 circuitry and high-Q inductor L102. The VCO oscillates in a frequency range from 184231 MHz. Biasing of Q101 is provided by R102, R103, R104 and R105. AC voltage divider C104, C105 and C106 initiates and maintains oscillation and matches Q101 to the tank circ uit. The high- Q inductor is grounded at one end to provide shunt inductance to the tank circu it.

The VCO frequency is controlled in part by DC voltage across vara ctor diode D101. As voltage ac ross a reverse-biased varactor diode increases, its capacitance decreases. Therefore, VCO frequency increases as the control volta ge increa ses. The contr ol line is RF isolated from tank circ uit by ch oke L101. The amou nt of frequency change produced by D101 is controlled by series capacitor C102.

From the limiter the signal is fed to the quadrature detector. An external phase-shift network connected to U201, pin 8, shifts the phase of one of the detector inputs 90° at 450 kHz (the other inputs are unshifted in phase). When modulation occurs, the frequency of the IF signal changes at an audio rate as does the phase of the shifted signal. The detector, that has no output with a 90° phase shift, converts the phase shift into an audio signal. Z205 is adjusted to provide maximum undistorted output from the detector. The audio signal is then fed out on U201, pin 9.

Wideband Audio Amplifier

U202B amplifies the detected audio and data signal. R212/R213/R214 set th e gain of the amplifier and R215/R216/R217/R218 and RT202 provide a DC reference level. C226 bypasses the 450 kHz IF signal and C227 bypasses other frequencies. The output signal is adjusted by R220 and fed to J205, pin 1. Install jumper plug P205 on J205, pins 1-2 to select the 25 kHz audio to be routed to J201, pin 6.

Q102 and Q103 form a cascade-connected buffer circuitry. DC bias is produced by R107, R108, R109 and R112. A signal oscillated at Q101 is DC cut and adjusted by C107, and fed into the buffer. An output from RF choke L104 passes through an adjustment ci r cuit consisting of C114 and C119.

6.1.7 ACTIVE FILTER

Q801 functions as a capacitance multiplier to provide filtering of the 12V supply to Q802. R803 and R804 provide transistor bias, and C812 provides the capacitance that is effe ctive ly multiplie d by the gain of Q801. If a noise pulse or other voltage chan ge appears on the collector, the base voltage does not change because of C812. Theref ore , the base current does no t change and transistor current remains constant. R805 decouples the VCO output from AC ground. L803 is an RF choke and C810, C811, C813 and C814 provi de RF bypass.

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6-4

REF

CLOCK

DATA IN

ENABLE

CIRCUIT DESCRIPTION

DATA OUT

PORT

out

OSC OR 4-STAGE DIVIDER

SHIFT

AND

CONTROL

LOGIC

13-STAGE R COUNTER

DOUBLE-BUFFERED

STANDBY

6-STAGE

A COUNTER

R REGISTER

16 BITS

C REGISTER

8 BITS

LOGIC

A REGISTER

24 BITS

INTERNAL

CONTROL

POR

12-STAGE

N COUNTER

SELECT

LOGIC

AND CONTROL

PHASE/FREQUENCY

DETECTOR A

AND CONTROL

PHASE/FREQUENCY

DETECTOR B

AND CONTROL

OUTPUT A

2LOCK DETECT

OUTPUT B (OPEN-DRAIN OUTPUT)

PDout

OR (UP)

OV (DOWN)

INPUT AMP

64/65

PRESCALER

Figure 6-4 SYNTHESIZER BLOCK DIAGRAM

6.1.8 BUFFER

A cascode amplifier formed by Q410/Q411 provides amplification and isolation between the VCO and Synthesizer. A cascode amplifier is used because it provides high gain, high isolation and consumes only a small amount of po wer. The input signal to t his amplifier is coupled from the VCO RF output on pin 5. DC blocking and coupling to the VCO is provided by C455 and to the buf fer b y C456. Bias f or the amplifier is provided by R442, R445, R446 an d R277. Q411 is a common-emitter amplifier and Q410 is a common-base with C458 and C457 providing RF bypass. L405 provides some filtering of the cascode output. R448 lowers the Q of L405. The output of the amplifier is coupled by C442/C441 to U401, pin 11.

MODULUS CONTROL

LOGIC

TEST 2

TEST 1

6.1.9 SYNTHESIZER

The inputs/outputs of synthesizer U401 are shown in Figure 6-4. The output signal from the synthesizer loop is the receiver first injection frequency. This signal is produced by a VCO (voltage-controller oscillator). The frequency of this oscillator is controlled by a DC voltage. This DC voltage is ge nerat ed by integrating the pulses from the phase detector in synthesizer chip U401.

Frequencies are selected by programming counters in U401 to divide by a certain number. This programming is provided through J201, pins 12, 18 and 20. The frequency stability of the synthesizer is established by the ±2.5 PPM sta bility of TCXO Y4 01. The output of this oscillator is stable from

-30°C to +60°C (-22°F to +140°F).

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August 2000

Part No. 001-2001-200

CIRCUIT DESCRIPTION

The VCO frequency of A401 is controlled by a DC voltage produced by integrating the phase detector output pulses of U401. The phase detector senses the phase and frequency of the two input signals (f and f

) and causes the VCO contro l voltage t o increas e

or decrease if they are not the same. When the frequencies are the same the VCO is "locked" on frequency.

One input signal to the phase detector in U401 is the reference frequency (f

). This is the 1 7.5 MHz

TCXO frequency divided by the R (reference) counter to the channel spacing or 6.25 kHz.

The other input to the phase detector in U401 is from the VCO frequency divided down by the "N" counter and prescaler in synthesizer U401 to

6.25 kHz. The "N" counter is programmed through the synthesizer data line on J201, pin 20. U401 is programmed so that the phase detector input (f cal to the reference freque ncy (f

) (6.25 kHz) when the

) is identi-

VCO is locked on the correct frequency.

The synthesizer contains the R (reference), N, and A counters, phase and lock detectors and counter programming circuitry. Frequencies are selected by programming the three counters in U401 to divide by assigned numbers. The programming of these counters is performed by circuitry in the Third Party Interface Card (TPI), wh ich is buffered a nd latched through the Interface Alarm Card (IAC) and fed into the synthesizer on J201, pin 20 to Data input port U401, pin 19.

6.25 kHz. Since the VCO is on freq uenc y (receive frequency plus 52.95 MHz) and no mul tiplicat ion is use d, the channel frequencies change in 6.25 kHz steps and the reference frequency (f

) is 6.25 kHz for all fre-

quencies selected by th is receiver.

The f

V input is produced by dividing the VCO

frequency using the prescaler and N counter in U401. The prescaler divides by 64 or 65. The divide number of the prescaler is controlled by the N and A counters in U401.

The N and A counters function as follows: both the N and A counters begin counting down from their programmed number. When the A counter reaches zero, it halts until the N counter reaches zero. Both counters then reset an d the cycle repeats. The A counter is always programmed with a smaller number than the N counter. While the A counter is counting down, the prescaler divides by 65. Then when the A counter is halted, the prescaler divides by 64.

Example:

Assume a receive frequency of 150.025 MHz. Since the VCO is 52.95 MHz above the receive frequency it must be 202.975 MHz. To produce this frequency, the N and A counters are programmed as follows:

N = 507 A = 28

NOTE: Section 8.2.5 describes how the N and A counter numbers can be calculated for other channels.

Data is load ed into U401 serially on the Data input port U401, pin 19. Data is clocked into the shift registers a bit at a time by a low to high transition on the Clock input port U401, pin 18. The Clock pulses come from the MPC via the IAC to J201, pin 18.

As previously stated, the counter divide numbers are chosen so that when the VCO is operating on the correct frequency, the VCO-derived input to the phase detector (f derived input (f

V) is the same frequency as the TCXO-

R) which is 6.25 kHz.

The f

R input is produced by dividing the

17.5 MHz TCXO frequency by 2800. This division is done by the "R" counter in U401. The counter always divides by 2800 regardless of the channel frequency. This produces a reference frequency (f

August 2000 Part No. 001-2001-200

) of

To determine the overall divide number of the prescaler and N counter, the number of VCO output pulses required to produce one N counter output pulse can be counted. In this example, the prescaler divides by 65 for 65 x 28 or 1,820 in put pul ses. It th en d ivides by 64 for 64 x (507 - 28) or 30,656 input pulses. The overall divide number K is therefore (30,656 + 1,820) or 32,476. The VCO frequency of 202.975 MHz divided by 80,476 equals 6.25 kHz which is the f input to the phase detect or. The overall divide number K can also be determined by the following formula:

K = 64N + A

Where, N = N counter divide number and A = A counter divide number.

6-6

CIRCUIT DESCRIPTION

6.1.10 BUFFER AMPLIFIER

A cascode amplifier formed by Q401 and Q402 provides amplification and also isolation between the TCXO and Synthesizer U401. A cascode amplifier is used because it provides high reverse isolation. The input signal to this amplifier is from TCXO Y401. C405 provides DC blocking. Bias for the amplifier is provided by R404, R406, R407, R408 and R409. L401 is an RF choke. RF bypass is provided by C403, C401 and C407. The output of Q401/Q402 is co upled to U401 by C432.

6.1.11 LOCK DETECT

When the synthesizer is locked on frequency, the Lock Detect output on U401, pin 2 is a logic high voltage with very narrow negati ve-going pulses. Then when the synthesizer is unlocke d, these pulses beco me much wider, the width may vary at a rate deter mined by the frequency difference of f

and fR. The lock

detect pulses are applied to J401, pin 14 and sent to the RF Interface on J103, pin 14 for detection and sampling in the IAC.

6.1.12 CHARGE PUMP, LOOP FILTER

The charge pump circuit charges and discharges C450, C451 and C452 in the loop filter to provide the 21V VCO control voltage (see Secti on 6.1.13). Puls es which control the charge pump are fed out of U401, pins 3/4. When both phase detector inputs are in phase, these output signals are high except for a very short period when both pulse low in phase. If the frequency of the f than that of the f

R input to the phase detector is higher

V input (or if the phase of f

leads fV),

the VCO frequency is too low. The negative-going pulses on the f wider and the f If the frequency of the f

V output (pin 4) then become much

R output (pin 3) stays essentially high.

input is greater than fR

(VCO frequency too high), the opposite occurs.

Q406 and Q407 are drivers which make the 5V levels and polarity of U401 phase detector outputs compatible with the high voltage supply to Q408 and Q409. Capacitors C444 and C446 momentarily bypass R432 and R437 when negative-going pulses occur. This speeds up the turn-off time of Q406 and Q407 by minimizing the effect of the base charge.

When a negative-going pulse occurs on pin 4, Q406 turns on which turns on Q408. Q408 sources current to charge up the loop filter capacitors C450/

C451, thereby increasing the VCO control line voltage. When a negative-going pulse occurs on pin 3, Q407 turns on which turns on Q409. Q409 sinks current to discharge the loop filter capacitors C450/C451 thereby decreasing t he VCO c ont rol line voltage. The source cur rent from Q408, when it is on, equals the sink current from Q409, when it is on.

6.1.13 VOLTAGE MULTIPLIER

The 17.5 MHz from Y401 is amplified by Q401/ Q402 and passed to the reference input of synthesizer U401, pin 20. This signal is also coupled from the output of Q401/Q402 through C408 to amplifier Q403. Biasing for Q403 is provided by R410, R411 and R412. The output of Q403 is direct coupled to switching transistors Q404/Q405.

When Q405 is turned on and Q404 i f off , C409 i s grounded on the side connected to the emitter of Q405. This allows the other side of C409 to charge from the 12V supply through R414, CR402 to C409. When Q404 turns on and Q405 is off. C414 charges up to approximately 12V plus the voltage that was stored across C809 from the last cycle. The output voltage is 21V due t o voltage loss in the tr ansistor and diodes. C413 is an RF bypass and C414 charges to 21V to stabilize the voltage. The 21V output is filtered by C415/L403/C416 to remove the 17.5 MHz ripple. The 21V output is applied to the charge pump Q408/Q409 and the VCO control line.

6.1.14 BUFFER AMPLIFIER

A cascode amplifier formed by Q131 and Q132 provides amplification and also isolation between the VCO and Receiver RF stages. A cascode amplifier is used because it provides high reverse isolation. The input signal to this amplifier is coupled from VCO A401 by C131. C131 also provides DC blocking. Bias for the amplifier is provided by R134, R133, R138, R132, R131 and R136. L131 is an RF choke and R135 sets the RF output impedance of the cascode. RF bypass is provided by C143, C142, C141, C140, C139, C138, C133, C134, C135 and C136. Th e output of Q131/Q132 is matched to the Receiver RF stages by a section of microstrip, C144, signal pad R139/R140/R141, C145, C146 and L133. C145 couples the signal to the input of the first injection amplifier.

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

6.1.15 FIRST AND SECOND INJECTION AMPLIFIERS

U303 provides the +12V source for these amplifiers. First injection amplifier Q133 is biased by CR131, R143, R144, R145 and R146. C148, C151, C149 and C150 provide RF bypass from the DC line. L134 on the collector is an RF choke. Q133 is matched to the 50 ohm signal pad R147, R148 and R149 by lowpass filter C152/L135/C153, C154. C155, L136, L156, L137, C157 and a section of microstrip match Q134 to the 50 ohm signal pad.

Second injection amplifier/buffer Q134 is similar in design to Q133. The output of Q134 is matc hed to 50 ohms by L134/C162/C163 and C164 provides DC blocking. L140/L141 are tuned to the receive frequency plus 52.95 MHz and passed to Mixer U101. This injection frequ ency is als o couple d throug h C165 to the injection test voltage circuit U102A. CR133, R158, R159 provide DC input to U102A, pin 3. The output of U102A, pin 1 is connected to J201, pin 13 for a receive injection test point and to the RF Interface Board on J103, pin 13.

6.2 EXCITER

6.2.1 VCO (A007)

The Voltage-Controlled Oscillator (VCO) is formed by Q101, associated circuitry and High-Q indicator L102. The VCO oscillates in a frequency range from 132-178 MHz. Biasing of Q101 is provided by R102, R103 and R104. An AC voltage divider formed by C107 and C108 initiates and maintains oscillation. C106 couples Q101 to the High-Q inductor. RF choke L103 completes the DC bias path to ground.

The VCO frequency is controlled in part by DC voltage across varactor diode D101. As voltage across a reverse-biased varactor diode increases, its capacitance decreases. Therefore, VCO frequency increases as th e contr ol vol tage inc rease s. The c ontrol line is RF isolated from tank circuit by choke L101. The amount of frequency change produc ed by D101 is controlled by series capacitor C102.

The frequency is modulated in a similar manner. The transmit audio/data signal is applied across varactor diode D102 to var y the VCO fr equenc y at an a udio rate. C104/C105 in serie s with D102 de termine the amount of modulation produced by the audio signal.

6.2.2 VCO BUFFER

Q102/Q103 form a cascade-connected buffer circuitry. DC bias is produced by R107, R108, R109 and R1212. A signal oscillated at Q101 is DC cut and adjusted by C107 and fed into the buffer. An output from RF choke L104 passes through an adjustment circuit consisting of C114/C119.

6.2.3 VCO/TCXO FREQUENCY MODULATION

Both the VCO and TCXO a re mod ula te d i n order to achieve the required frequency response. If only the VCO was modulated, the phase detector in U403 would sense the frequency change and increase or decrease the VCO control voltage to counteract the change (at the lower audio frequencies inside the closed loop bandwidth of the synth esi zer ) . If only the TCXO frequency was modulated, the VCO would not track the higher audio frequencies (those beyond the closed loop bandwidth of the synthesizer). However, by modulating both the VCO and TCXO a flat audio response is achieved. Potentiometers R425 and R446 balance the modulating signals.

There are two 3.5V sources on the Exc it er boar d; one is a reference for the modulation amplifier to the VCO, the other is for the modulation amplifier to the TCXO.

The reference voltage on U402B, pin 5 is also on buffer U407B, pin 5 to J401, pin 9 and RFIB connector J102, pin 9. The voltage leaves the RFIB on J101, pin 14 to J2, pin 27 on the backplane, to the bottom connectors via pin 7 and finally to the MAC on P100, pin 7.

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6-8

CIRCUIT DESCRIPTION

AMP

EX MOD

LPTT

V REF EX

DATA

CLK

SYN CS EX

SYN LK EX

U407B

AMP

U404A

SYNTHESIZER

PD OUT

U403

RF IN

REF IN

Q403/Q404

Q406/Q407

Q414/Q415V Q416/Q417

CHARGE PUMP

Figure 6-5 EXCITER BLOCK DIAGRAM

With reference to the ground on the Exciter, the

3.5V reference stability is maintained by U126B/C/D on the MAC. The 3.5V DC passes through summing amplifier U129B and transmi t modulation gat e U1 18D to P100, pin 29 (Tx MOD). P100, pin 29 i s con nect ed to backplane connector J2, pin 8 and RFIB connector J101, pin 22 to J102, pin 13. The transmit modulation and 3.5V reference enter the Exciter on J401, pin 13 and are routed to U402B, pin 6. R425 sets the TCXO modulation level. The modulation signal and the 3.5V DC are applied to U402A, pin 2.

BUFFER

U402AU402B

BUFFER

U404B

VCO

BUFFER

TCXO

Y401

Q410/Q411 Q413

BUFFER

SWITCH

Q405

TO PAA007

AMP

established by the ±2.5 PPM sta bility of TCXO Y4 01. This oscillator is stable from -30°C to +60°C (-22°F to +140°F).

The VCO frequency of A007 is controlled by a DC voltage produced by the phase detector in U403. The phase detector senses the phase and frequency of the two input signals and c aus es the VCO control voltage to increase or decrease if they are not the same. When the frequencies are the same, the VCO is then "locked" on frequency.

6.2.4 SYNTHESIZER

The synthesizer inputs/outputs are shown in Figure 6-5. The synthesizer output signal is the transmit frequency. This signal is produced by a VCO (voltage-controller oscillator) that is frequency controlled by a DC voltage produced by synthesizer chip U403. This DC voltage is filtered by a loop filter made up of C805, C806 and R804 in the VCO circuitry.

Frequencies are selected by programming counters in U403 to divide by a certain number. This programming is provided through J401, pins 12, 19 and 20. The frequency stability of the synthesizer is

The synthesizer contains the R (reference), N, and A counters, phase and lock detectors and counter programming circuitry.

One input signal to the phase detector in U403 is the reference frequency (f

R). This frequency is the

17.5 MHz TCXO frequency divided by the reference counter to the frequency step or 6.25 kHz. The other input signal (f

V) is the VCO frequency divided by the

"N" counter in U403. The counters are programmed through the synthesizer data line on J401, pin 20. Each channel is programmed by a divide number so that the phase detector input is identical to the reference frequency (f

R) when the VCO is locked on the

correct frequency.

August 2000

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

Frequencies are selected by programming the three counters in U403 to divide by assig ned numbers. The programming of these counters is performed by circuitry in the Third Party Interface (TPI), buffered and latched through the In terface Alarm Card (IAC) and fed into the synthesizer on J401, pin 20 to Data input port U403, pin 19.

Data is load ed into U403 serially on the Data input port U403, pin 19 when U403, pin 17 is low. Data is cloc ked into the shift registe rs a bit at a time by a low to high transition on the Clock input port U403, pin 18. The Clock pulses come from the MPC via the IAC to J401, pin 19.

As previously stated, the counter divide numbers are chosen so that when the VCO is operating on the correct frequency, the VCO-derived inpu t to the phase detector (f derived input (f

V) is the same frequency as the TCXO-

R). The fR input is produced by divid-

ing the 17.5 MHz TCXO frequency by 2800. This produces a reference frequency (f

R) of 6.25 kHz.

Since the VCO is on frequency and no multiplication is used, the freq uencies are c hanged in 6. 25 kHz steps. The reference frequency is 6.25 kHz for all frequencies selected by this Exciter.

The f

V input is produced by dividing the VCO

frequency using the presc al er and N count er in U403 . The prescaler divi des by 64 or 65. The divid e n umber of the prescaler is controlled by the N and A counters in U403. The N and A counters function as follows:

Both the N and A counters begin counting down from their programmed number. When the A counter reaches zero, it halts until the N counter reaches zero. Both counters then reset and the cycle repeats. The A counter is always programmed with a smaller number than the N counter. While the A counter is counting down, the prescaler divides by 65. Then when the A counter is halted, the prescaler divides by 64.

Example: To illustrate t he operation of these counters, assume a transmit frequency of 150.250 MHz. Since the VCO is the channel frequency for transmit this frequency is used. To produce this frequency, the N and A counters are programmed as follows:

N = 375 A = 40

To determine the overall divide number of the prescaler and N counter, the number of VCO output pulses required to prod uce one N counter output pulse can be counted. In this example, the pres cal er divi des by 65 for 65 x 40 or 2,600 input pulses. It then divides by 64 for 64 x (375 - 40) or 21,440 input pulses. The overall divide number K is therefore (21,440 + 2,600) or 24,040. The VCO frequency of

150.250 MHz divided by 24,040 equals 6.25 kHz which is the f

R input to the phase detecto r . The ove rall

divide number K can also be determined by the following formula:

K = 64N + A

Where, N = N counter divide number and A = A counter divide number.

NOTE: Section 8.2.5 describes how the N and A counter numbers can be calculated for other channels.

6.2.5 BUFFER AMPLIFIER

A cascode amplifier formed by Q403 and Q404 provides amplification and isolation between the TCXO and Synthesizer U403. A cascode amplifier is used because it provides high gain, high reverse isolation and consumes only a small a mount of power. The input signal to this amplifier is coupled from TCXO Y401, pin 5 by C420. C420 also provides DC blocking. Bias for the amplifie r is pro vided by R430, R431, R432, R433 and R428. L402 is an RF choke. RF bypass is provided by C416, C418 and C419. The output of Q403/Q404 is coupled to U403, pin 20 by C417.

6.2.6 BUFFER AMPLIFIER

A cascode amplifier formed by Q406 and Q407 provides amplification and also isolation between the VCO and Synthesizer U403. A cascode amplifier is used because it provides high gain, high isolation and consumes only a small amount of power. The input signal to this amplifier is coupled from VCO A007, pin 6 by C433. C433 also provides DC blocking. Bias for the amplifier is provided by R450, R451, R453, R454 and R455. L403 is an RF choke. RF bypass is provided by C430, C431 and C479. The output of Q406/Q407 is coupled to U403, pin 11 by a non-polarized capacitor formed by C429/C499.

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6-10

CIRCUIT DESCRIPTION

6.2.7 LOCK DETECT

When the synthesizer is locked on frequency, the Lock Detect output on U403, pin 2 is a high voltage with narrow negative-going pulses. When the synthesizer is unlocked, the negative-going pulses are much wider, the width may vary at a rate determined by the frequency difference of f

V/fR.

The locked or unlocked condition of the synthesizer is filtered by R440/C423 and appl ied to J401, pi n 16, then sent to the RF Interface on J102, pin 16 for detection.

6.2.8 CHARGE PUMP, LOOP FILTER

The charge pump circuit charges and discharges C519, C520 and C521 in the loop filter to provide the 12V VCO control voltage (see Secti on 6.1.12). Puls es which control the charge pump are fed out of U403, pins 3/4. When both phase detector inputs are in phase, these output signals are high except for a very short period when both pulse low in phase. If the frequency of the f than that of the f

R input to the phase detector is higher

V input (or if the phase of f

leads fV),

the VCO frequency is too low. The negative-going pulses on the f wider and the f If the frequency of the f

V output (pin 4) then become much

R output (pin 3) stays essentially high.

input is greater than fR

(VCO frequency too high), the opposite occurs.

Q414 and Q415 are drivers which make the 5V levels and polarity of U403 phase detector outputs compatible with the high voltage supply to Q416 and Q417. Capacitors C523 and C517 momentarily bypass R494 and R498 when negative-going pulses occur. This speeds up the turn-off time of Q414 and Q415 by minimizing the effect of the base charge.

6.2.9 BUFFER AMPLIFIER

A cascode amplifier formed by Q410/Q411 provides amplification and also isolation between the VCO and exciter RF stages. A cascode amplifier is used because it provides high gain, high isolation and consumes only a small amount of power. The input signal to this amplifier is t appe d fr om VCO A007, pin 4 by C441. C441 also provid es DC block ing. Bias fo r the amplifier is provided by R464, R465, R466, R467 and R468. L406 is an RF choke and R483 lowers the Q of the coil. RF bypass is provided by C434, C442, C445, C443, C444 and C480. The output of Q410/ Q411 is matched to the Exciter RF stages by a section of microstrip, C446, signal pad R459/R460/R461, C498, C450 and L408.

6.2.10 RF AMPLIFIERS

RF amplifier Q413 is biased by CR403, R477, R478, R479 and R480. C508 provides RF bypass from the DC line and R479/R480 provide supply voltage isolation. L 41 1 i s an RF choke t o the suppl y line. Q413 is matched to 50 ohms by low pass filter C509/ L412/C510 and C465 provides DC blocking. The RF output of the Exciter is on coaxial connector J402 to the Power Amplifier.

6.3 1 10W POWER AMPLIFIER

6.3.1 AMPLIFIER/PREDRIVER

RF input to the PA from the Exci ter is through a coaxial cable and conn ector to WO511. C501 couples the RF to signal pad R501/R502/R503 that connects the input to 0.3W pre-driver Q501. R504, R505 and R506 provide DC bias to the gate of Q501. C506, C507 and C508 provide RF bypass from the DC supply line. L503 is an RF choke . C510 and C522 pro vide RF bypass. C511/L504/C512/C513 match Q501 output impedance to U501 input impedance. U502 provides Q501 with DC voltage regulated at 8V.

When a negative-going pulse occurs on pin 4, Q414 turns on which turns on Q416. Q416 sources current to charge up the loop filter capacitors C519/ C520, thereby increasing the VCO control line voltage. When a negative-going pulse occurs on pin 3, Q415 turns on which turns on Q417. Q417 sinks current to discharge the loop filter capacitors C519/C520 thereby decreasing t he VCO c ont rol line voltage. The source current from Q416, when it is on, equals the sink current from Q417, when it is on.

6.3.2 DRIVER

U501 is a 12W amplifier operating in the 132178 MHz range. The RF is applied to the input of the splitter and to the finals.

Power control is connected to WO505 from the RF Interface board (RFIB). RF is filtered from the control voltage line by various capacitors to U501, pin 2. This control voltage regulates the RF output of the amplifier on U501, pin 5 to approximately 10W.

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CIRCUIT DESCRIPTION

FINAL 1 CURRENT

DRIVER CURRENT

RF IN

POWER CONTROL

TEMPERATURE SENSOR

FINAL 2 CURRENT

PRE-DRIVER

Q501

U502 AMP

U509

DRIVER

U501

TEMP SENSE

U507U506A

Figure 6-6 110W POWER AMPLIFIER BLOCK DIAGRAM

6.3.3 FINAL AMPLIFIERS

Q502 and Q503 are combined 60W amplifiers. The 10W RF input from the dri ver U501 is applied to a 7 0.7 ohm Wilkinson splitter and then to the gate of each MOSFET amplifier. The 60W outputs on the drain of the amplifiers are combined using a Wilkinson combiner . Q502 has a half-wave tr ansmissionline on the input and Q503 has a half -wave on the output. These T-lines are used to dr ive the 60W amplifie rs o ut of ph ase. The output of the combiner is fed from WO513 directly to the forward/reverse power detect board.

The Wilkinson splitter and combiner provide the capability to split the drive input and combine the final outputs while maintaining isolation between the two final amplifiers. The combiner consists of two quarter-wave transmission lines and a balancing resistor. During normal op eration, a signal of relatively equal phase and amplitude is present on both ends of the balancing resis tor . Therefo re, no current fl ows and no power is dissipated in the balance resistor. If one final failed, the other final of a pair would continue to function.

6.3.4 POWER DETECTORS

The supply current is monitored through a resistor that creates a current output level indicative of the power output. The outputs of U503, U504 and U505 are monitored by the Universal Station software

U503

Q502

FINAL 1

FINAL 2

Q503

U504

U601A/B

FORWARD

POWER

LPF RF OUTPUT

RF LOAD

U651A/B

REVERSE

(REFLECTED)

POWER

through the RF Interface Board. If a final amplifier fails, the software will reduce the output power to prevent over-driving the remaining final amplifier.

6.3.5 THERMAL SENSOR

Thermal protection is provided by temperature

sensor U507. The operating range of the sensor is from -30° C to 100° C (-22° F to 212° F). Amplifier U506A sends the output of U507 through WO509 to the RF Interface Board. The RF Interface Board reduces the power amplifier to half po wer (via the MPC) if the temperature reading is too high and turns the fan on and off (not via the MPC). The fan is turned on at approximately 50°C and off again at 42°C.

6.3.6 FORWARD/REVERSE POWER DETECT, CIRCULATOR, LOW-PASS FILTER

The power amplifier output is directly coupled to the forward/reverse power detect board via a jumper. The output then enters the circulator and exits to the low-pass filter board and the antenna jack for a minimum power output of 110W at the default setting. If an antenna is not connected, the circulator connects the output power to R685.

Forward and reverse power are electromagnetically coupled from the input and reflected ports of the circulator. R663/R680 calibrate the forward and reverse sense levels. The sensed levels are coupled to the RF Interface Board a nd software .

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CIRCUIT DESCRIPTION

6.4 RF INTERFACE BOARD

The RF Interface Board (RFIB) connects the Receiver, Exciter and Power Amplifier to the backplane and power supply (see Figure 6-7).

The input and output connectors for the RF Interface Board are defined as follows.

6.4.1 POWER CONNECTOR

The power supply is connected to the RF Interface Board when the RF module is inserted into the station cabinet (see Figure 10-2). The jack portion of the connection is on the RF Interface Board, the plug portion is attached to the station cabinet.

P101/P102 +26.5V DC - Supply voltage to PA. +26V ±1%, 20A at 110W.

P103 +15V DC - Supply voltage to Exciter, Receiver and Power Control. 15V ±1%, 5.5A max.

P104/P105 GROUND - Ground return for the RF assembly.

6.4.2 SIGNAL CONNECTOR (J101)

This is the sign al inte rface con nector (36 pin) that connects the RFIB to the backplane connector J2 (34 pin) through cable assembly A8.

Pin 1 GROUND

Pins 5-6 UNUSED

Pin 7 RX WBAND

The wide band audio is from the receive audio demodulator U202 and goes to the MAC in the Controller card cage. The typical amplitude is 387 mV RMS (-6 dBm) and 2V DC with Standard TIA Test Modulation into the receiver. Little wave shaping is done on the receiver board other than a 31 kHz RC LPF which strips off the 450 kHz IF. Buffering is done with an op-amp.

Pin 8 RF DATA A

Data A (U105, pin 11) is the least significant bit (LSB) in the 3 multiplex chips located on the RFIB. This pin is a CMOS input from the Controller requiring a logic high for activation.

Pin 9 RF DATA C

Data C (U105, pin 9) is the most significant bit (MSB) in the 3 multiplex chips located on the RFIB. This pin is a CMOS input from the Controller requiring a logic high for activation.

Pin 10 RF MUX2 INH

The Multiplexer-2 Inhibit (U106, pin 6) is a CMOS input from the Controller that inhibits (disables) the output from the RF 2 Multiplexer with a logic high.

Pin 1 carries ground current between the RF

Interface board and Backplane board.

Pin 2 PC STR

Pin 2 is the power Control Strobe. This is normally low until after the power control data is shifted into the pow er control register. Then the strobe line goes high and back to low. The clock or data lines cannot be changed until after the strobe is set.

Pin 3 HS CS EX

Pin 3 is not used at this time.

Pin 4 GROUND

Pin 4 carries ground current between the RF Interface board and Backplane board.

Pin 11 RF CLK

The clock will control the synthesizer chip and power control circuit when loadi ng. This pin is a TTL input from the Controller.

Pin 12 HS CS RX

Pin 12 is not used at this time.

Pin 13 RF MUX1 INH

The Multiplexer-1 Inhibit (U105, pin 6) is a CMOS input from the Controller that inhibits (disables) the output from the RF 1 Multiplexer with a logic high.

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CIRCUIT DESCRIPTION

Pin 14 V REF EX

This is the 3.5V reference to the Exciter TCXO.

3.5V from the Exciter is passed from J102, pin 9 to this pin and the backplane. The voltage then passes through the MAC and back to the backplane to J101, pin 22 with the TX MOD. These are connected to J102, pin 13 back to the Exciter.

Pins 15-18 UNUSED

Pin 19 RF MUX3 INH

The Multiplexer-3 Inhibit (U104, pin 6) is a CMOS input from the Controller that inhibits (disables) the output from the RF 3 Multiplexer with a logic high.

Pin 20 LPTT

The Logic Push-To-Talk is an open collector from the Controller. It has a sink capability of 20 mA and a maximum voltage rating of 18V. The transmitter should produce power when this pin is a logic low.

Pin 21 SYN CS EX

This input goes low to enable the loading of data into the exciter synthesizer chip U403.

Pin 22 TX MOD

The audio from the MAC in the Controller processes a number of inputs to the station to produce the signals on this pin . This sig nal goes thr ough th e RFIB and then to the Exciter. A 707 mV RMS sine wave (2V P-P) at 1 kHz produces 60% of system deviation in the transmitter. The source impedance is low and the input impedance is less than 10k ohms.

Pin 23 GROUND

Pin 23 carries ground current between the RFIB and Chassis Backplane.

Pin 24 UNUSED

Pin 25 LOGIC CONTROL TO FANS

Pin 26 RF DATA B

The Data B (U105, pin 10) is the middle significant bit in the three multiplex chips located on the RFIB. This pin is a CMOS i nput from the Controller requiring a logic high for activation.

Pin 27 A D LEVEL

20 lines (of the possible 24) of RF functions sampled are multiplexed to the Controller through this pin using three multiplex chips.

• RF Forward Power Sense

• RF Power Sense Device 1

• RF Power Sense Device 2

• RF Power Sense Device 3

• RF Power Sense Device 4

• RF Reflected Power Sense

• PA Temperature

• Transmit Audio Modulation

• High Stability Exciter Lock Detector

• Exciter Lock Detector

• Receiver Detector Audio

• Receive Signal Strength Indicator

• Receiver Injection Level

• High Stability Receive Lock Detector

• Receiver Lock Detector

• Fan Current 1

• Fan Current 2

• Fan 1 On Sense

• Power Supply Temp

• Battery Voltage

Pin 28 RF DATA

A data pin with TTL levels from the Controller which has the dual role of loading the synthesizer chips and adjusting the power control D /A lines for proper output power. Up to four synthesizer ch ips an d a shift-register could be connected to this pin.

Pin 29 SYN CS RX

This input goes low to enable the loading of data into the receiver synthe sizer chip U401.

Pin 25 is in parallel with the temperature sensor.

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CIRCUIT DESCRIPTION

Pin 30 RSSI

This pin is the Rec eive Sign al S trengt h Indicatio n to the Controller. This RSSI is used for tune-up of the Receiver front-end during factory test mode. The dynamic range is 60 dB. It has an output from an opamp with the voltage going from 0.5V to 4.5V. The level has an adjustment in the Receiver.

Pin 31 GROUND

Pin 31 carries ground current between the RFIB and Chassis Backplane.

Pins 32-36 UNUSED

6.4.3 FAN CONNEC TOR (J104)

The outputs to the fan connectors are 4-pin plugin terminals that supply DC voltage. The plug on the fan is a 2-pin connector. The plug-in terminals are located on the back of the RFIB.

WO 116 +26.5V DC

This capacitive feedthrough pin is at +26.5V DC and carries the PA current, 25A nominal at 1 10W from P102 to the Power Amplifier board.

WO 117 +26.5V DC GROUND

This capacitive feedthrough pin carries ground current from P105 to the Power Amplifier board. It must be capable of carrying up to 25A.

W118 +15V DC

This capacitive feedthrough pin connects +15V DC P103 to t he PA, Exciter, and Forward/Reverse Power Detect boards. Maximum current handling is 6A (4A nominal at 110W).

WO 119 NOT USED

Pin 1 FAN 1 LOW

Pin 1 is the ground return for Fan 1.

Pin 2 FAN HI

Pin 2 carries the voltage to Fan 1. The current is

1/4A nominal at 20V to 30V. This pin goes high when the PA heat sensor rises above 50°C and goes low below 45°C.

Pin 3 FAN2 LO

Pin 3 is the ground return for Fan 2.

Pin 4 FAN HI

Pin 4 carries the voltage to Fan 2. The Voltage is

20V-30V at 1/4A nominal. Pin 4 goes high when the PA heat sensor rises above 50°C and goes low below 45°C.

6.4.4 POWER AMPLIFIER CONNECTIONS

WO 115 POWER SENSE

This capacitive feedt hrough pi n is at +15 V DC to

the Power Detect Board.

WO 120 CTRL OUT

This capacitive f eedthroug h pin carries t he output of the power control driv er on the RFIB to the power control pin of the power module on the Power Amplifier board. The voltage varies from 0V-15V with current as high as 0.5A.

WO 121 FWD PWR

This capacitive feedthr ough pin is the forward power sense line. It is a voltage source that is a function of the output power of the Power Amplifier. The voltage level will be between 0V-5V and drive a 10k ohm load. A typical voltage of 3V corr elate s to 110W out of the PA. This line goes through the mult iplexers and A D LEVEL line to the Controller for processing.

WO 122 RF OUT 1

This capacitive feedthrough pin is a voltage source that is a func ti on of the output power of U50 1. The voltage level will be between 0V-5V and drives a 10k ohm load. This l ine goes through t he mult iplexers and A D LEVEL line to the Controller for processing.

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

WO 123 RF OUT 2

This capacitive feedthrough pin is a voltage source that is a function of the output power of Q501. The voltage level will be between 0V-5V and drive a 10k ohm load. This l ine go es th roug h the multipl exers and A D LEVEL line to the Controller for processing.

WO 124 RF OUT 3

This capacitive feedthrough pin is a voltage source that is a function of the output power of Q502. The voltage level will be between 0V-5V and drive a 10k ohm load. This l ine go es th roug h the multipl exers and A D LEVEL line to the Controller for processing.

WO 125 RF OUT 4

This capacitive feedthrough pin is a voltage source that is a function of the output power of Q503. The voltage level will be between 0V-5V and drive a 10k ohm load. This l ine go es th roug h the multipl exers and A D LEVEL line to the Controller for processing.

WO147 RF DETECT DRIVER

This senses power out of the driver. It is used to limit the power out of the driver to 0.4 dB over 110W at room temperature.

WO143 +26V DC

This is the +26.5V DC source to the RFIB from P101.

WO144 +15V DC

This is the +15V DC source to the RFIB from P103.

WO145 GROUND

W145 carries ground current from P104 to the RFIB.

6.4.5 EXCITER CONNECTOR (J102)

WO 126 REFL PWR

This capacitive feedthrough pin is the reflected power sense line. It is a voltage indicative of the power reflected due to a mismatch. The voltage produced will typicall y be such tha t less th an a 3:1 VSWR will not trigger alarms and when VSWR = 6:1 the controller will reduce powe r. The voltage level wil l be between 0V-5V and drive a 10k ohm load. This line goes through the multipl exe rs an d A D LEVEL line to the Controller for processing. The time to sense and reduce the power takes several seconds.

WO 127 TEMP

This capacitive feedthrough pin is the temperature sense l ine of the Power Amplifier. It will be a linearly variable function of temperature ranging from 0V-5V output and 0°C to +100°C (+32°F to 212°F) input when driving a 10k ohm load. The primary functions of this line are for fan on/off and PA power reduction. The fan should be turned on at 50°C and off at 45°C. The PA should have power reduced when 90°C (194°F) is reached a nd with absolute turn-off at 95°C (203°F). This line goes through the multiplexers and A D LEVEL line to the Controller for processing.

The connector from the E xciter (J401) to the RF Interface board (J102) links the Exciter to the MPC in the Controller Backplane.

Pin 1 VCC1

The voltage on this pin is a fused +15V ±1%, nominal current of 0.5A. It provides current to the Exciter from the RFIB.

Pins 2-8 GROUND

Pin 9 +3.5V DC

Pin 9 is the +3.5V DC TCXO reference voltage from the Exciter to the MAC.

Pin 10 GROUND

Pin 11 LPTT

The Logic Push-To-Talk (LPTT) is an open collector from the Controller. It has a sink capability of 20 mA nominal and a volta ge rating of 18V maximum. The transmitter sho uld produce power when t hi s p in is a logic low.

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CIRCUIT DESCRIPTION

Pin 12 SYN CS EX

Pin 12 is the Exciter synthesizer chip select. It allows data input t o t he s ynthesizer chip when the l in e is pulled to a logic low.

Pin 13 TX MOD

The audio from the MAC in the Controller processes a number of inputs to the station per the TIA specifications to produce the signal on this pin. This signal goes through the RFIB to the Exciter. A 707 mV RMS (2V P-P) sine wave at 1 kHz provides 60% of system deviation in the transmitter. The DC voltage on the line is 3.5V ±0.1V. The source impedance should be low (output of an op-amp or analog switch < 200 ohms) and the input impedance will not be less than 10k ohms.

Pins 14-15 GROUND

These pins carry ground current between the RFIB and th e Exciter boa rd.

Pin 16 SYN LK EX

Pin 16 is the Exciter synthesizer lock detector output. Th e synthesizer is locked with a TTL l ogic high state.

Pin 17 HS LK EX

Pin 17 is not used at this time.

Pin 18 HS CS EX

This input is not used at this time.

Pin 19 RF CLK

put power. The data has TTL levels. Up to four synthesizer chips and a shift register could be connected to this pin.

6.4.6 RECEIVER CONNECTOR (J103)

The connector from the Receiver (J201) to the RF Interface board (J103) links the Receiver to the MPC in the Controller Backplane.

Pin 1 VCC1

Pin 1 is fused +15V ±1% with a nominal current of 1A provides current from the RFIB to the Receiver.

Pins 2-6 UNUSED

Pin 7 RSSI

This pin is the Receive Signal Strength Indicator (RSSI) to the Controller. The RSSI is used for tuneup of the Receiver front-end during test mode. The dynamic range is 60 dB. Output is from an op-amp with the voltage going from 0.5V to 4.5V. The level has an adjustment in the Receiv er (see Secti on 6.1.4 o r

6.1.5).

Pin 8 UNUSED

Pin 9 RX WBAND

The receive wide band audio i s fr om the demodulator and goes to the Main Audio Card (MAC) in the Controller card cage. The typical amplitude is 387 mV RMS (-6 dBm) and 2V DC with Standard TIA Test Modulation into the Receiver. Little wave shaping is done on the Receiver board other than a 31 kHz RC LPF which strips off the 450 kHz IF. Buffering is done with an op-amp which can drive a 10k ohm load.

The clock controls the Exciter synthesizer when loading. The input source in the Controller is TTL with the speed determined by the synthesizer chip. There could be as many as four synthesizers and a shift register.

Pin 20 RF DATA

Pin 20 is a data pin from the Contr oller which has the dual role of loading the synthesizer chip and adjusting the power control D/A lines for proper out-

Pin 10 UNUSED

Pin 11 GROUND

Pin 11 carries ground current between the RFIB

and the Receiver board.

Pin 12 SYN CS RX

Pin 12 is the Receiver synthesizer chip select. This chip is the same part as used in the E xciter. A low enables loading the Synthesizer.

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Part No. 001-2001-200

August 2000

CIRCUIT DESCRIPTION

Pin 13 RX INJ

This pin is the power sense for the Receiver injection. It is a linear voltage source that is a function of the injection power. The voltage level will be between 0V - 5V and be able to drive a 10k ohm load.

Pin 14 SYN LK RX

Pin 14 is the main synthesizer lock detector output for the Receiver. The synthesizer is locked with a TTL logic high state.

Pin 15 GROUND

Pin 15 carries ground current between the RFIB and the Receiver board.

Pin 16 HS CS RX

Pin 16 is not used at this time.

Pin 17 GROUND

Pin 17 carries ground current between the RFIB and the Receiver board.

Pin 18 RF CLK

The clock controls the Receiver synthesizers when loading. The input source in the Co ntroller is TTL with the speed determined by the synthesizer chip.

Pin 19 HS LK RX

Pin 19 is not used at this time.

Pin 20 RF DATA

Pin 20 is a data pin from the Controll er which has the dual role of loading the synthesizer chips and adjusting the power control D/A lines for proper output power. The data has TTL levels. Up to four synthesizer chips and a shift register could be connected to this pin.

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CIRCUIT DESCRIPTION

PC STR

RF MUX3 INH

VREF EX

LPTT

RF MUX1 INH

A D LEVEL RF DATA C RF DATA B RF DATA A

TX MOD

STN CS EX

HS CS EX

RF MUX2 INH

RSSI

RX WB AUDIO

RF DATA

RF CLK

SYN CS RX

HS CS RX

FAN HIGH

FAN 1 LOW

FAN HIGH

FAN 2 LOW

Q101

WO103

MUX/RES

STR SER CLK

E A0 A1 A2 Z

U103

MUX 3

U104

Q8 Q7 Q6 Q5 Q4 Q3 Q2 Q1

Y0 Y1 Y2 Y3 Y4 Y5 Y6

U109A

FORWARD

POWER

U102A

U112A

U112C

U109D

RF POWER CONTROL

U102B

COMPARATOR

Q108 Q111B

U112B

U112D

U109B

POWER ADJUST

Q102-Q105

+26V

+15V

P101 P102 P103 P104 P105

PWR CNTRL RF DET (PRE-DRIVER) FORWARD POWER FINAL 1 POWER FINAL 2 POWER FINAL 3 POWER FINAL 4 POWER REFLECTED POWER TEMPERATURE

EXCITER

MUX 1

13 27

22 21

7 28 11 29 12

J104

FAN 1 BUFFER

U107A

FAN 2 BUFFER

U107B

U105

A2 A1

Y2 Y1

Y7 Y6

MUX 2

Y0Z

U106

+15V

U110E

U110B

Q106Q107

5V REGULATOR

U101

U110F

U110A

U108A

+5V

LPTT

VREF EXWO135

SYN LK EX HS LK EX RF CLK RF DATA TX MOD SYN CS EX HS CS EX

RECEIVER

RX INJ HS LK RX SYN LK RX

RSSI RX WBAND RF DATA RF CLK SYN CS RX HS CS RX

Figure 6-7 RF INTERFACE BOARD BLOCK DIAGRAM

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

6.5 800W POWER SUPPLY

WARNING

This power supply cont a ins vol t age pot ential s grea ter than 400V. Considering the dangerous voltages and the complexity of the switch-mode power supply, it is strongly recommended the power supply be returned to E.F. Johnson for repair (see Section 1.7).

6.5.1 FILTER BOARD

AC power is brought into the power supply through the IEC connector in the front of the power supply (see Figure 2-8). This connector is attached to the EMI filter assembly, Part No. 023-2000-820. The filter contains common mode and differential mode filtering such that the supply complies with FCC Class-A regulations. In addition to the filter components (C1, C2, L1, C3, C4, L2, C5) R1 is used to discharge the filt er capacitors when AC is re moved. Metal-oxide varistors (RV001/RV002) are placed across the line on the input a nd outpu t of the EMI f ilter that clamp transient s on the AC li ne to prev ent damage to the power supply. The AC power i s fused with F001 after the connect or and bef ore th e filt er. Replace fuse with a 15A/250V (314015) fuse.

C111. The resistor network connected to CR104 charges up C106/C107 to +18Voff the line. This provides the bias voltage required to start the controller IC U102. Once the IC turns on current is being switched on L107. A small tap winding on L107 provides sustaining curr ent to the U102 . When AC is first connected it could ta ke several seconds for C106/C107 to charge to +14V before the u nit starts.

U102 samples the input voltage through R105/ R106/R107; the input current through T103/T104/ CR146/CR108/R113/R114; and the output voltage through the divider at R127 . U102 modulates t he du ty cycle to MOSFET Q101 such that the input current is shaped like and in phase with the input voltage. The controller has two feedback loops; a voltage loop to keep the 400V constant and a current loop to keep input current correct. Compensation for the current error amp is C120/R141/C121 on U102, pin 1. Compensation for the voltage error amp is provided by C127/C142/C126 on U102, pin 16. U102, pin 4 and associated circuitry au tomatically adjust the Power Factor Correction (PFC) for input voltage (100-240V AC), line frequency (50-60 Hz) and l o ad on the po wer factor.

NOTE: The output vol tage of the power f act or section is at 400V DC. This voltage is bled off slowly. After turning off, it can take more than 5 minutes to discharge.

At the output of the filter board is a bridge rectifier. The rectifier is heat sunk to the filter bracket through a Grafoil thermal interface pad. Filtered AC power is connected to the main board via wires W001 and W003. Filter and rectified current is brought to the main board via wires W0 04 and W005. The sa fety ground is connected from the filter board to a stud in the chassis through W002.

6.5.2 POWER FACTOR CORRECTION

The power factor switching frequency is set at

87.5 kHz, ±5 kHz. The average current mode boost converter is comprised of L107, Q101, CR145, C110, C111. Half of U102 is used for power factor correction. RT101/RT102 are negative temperature coefficient thermistors that limit the in-rush current to C110/

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6.5.3 MAIN PULSE WIDTH MODULATOR

The +26.5V output is created from a two-transistor forward converter Q116/Q118. It uses the 400V output of the power factor correction on C110/C111 for an input voltage. The same controller IC (U102) drives the +26.5V stage. This stage runs at exactly twice the power factor correction frequency and uses trailing edge modulation. The pulse width modulator uses the PFC supplied current for modulation scheme that reduces ripple current in C110/C111.

The output of the IC, U102, pin 11 is fed to a level shifting gate drive network comprised of C139, C140, T106, C136, C197, C137 and C228. Each MOSFET (Q116, Q118) of the two-transistor forward converter has a gate protection zener diode CR117, CR120 respectively. In addition, each power MOSFET has a gate turnoff network.

6-20

CIRCUIT DESCRIPTION

+15V DC OUT

U119

U116, Q126

L103

Q127

Q128

SAWTOOTH BUFFER

VREF

U112

RAMP/ISD

+15V

OUT

BUCK CONVERTER

CONTROLLER

T105

CURRENT SENSE

T108

Q122, Q123

L102

Q124, Q125

+26.5V

ISOLATION

HI/LO VOLTAGE

PROTECTION

OVER VOLTAGE

+5V TO U104

U105

+15V DC

+5V REG

U104A/B

Q110, Q111, Q112

U111

EXT IN

+26.5V DC

SYNC

L101

T106

CONTROLLER

U115

OVERVOLTAGE

SHUTDOWN

+5V DC OUT

U113

RAMP/ISD

EA OUT/INV

OUT

FAN

FAN CONTROLLER

U120

U117, Q133

PROTECTION

OVER VOLTAGE

L104

T109

Q129, Q130

Q131, Q132

BUCK CONVERTER

U122

U118, Q138

PROTECTION

UNDER VOLTAGE

-5V DC OUT

OUT

U114

VCC

BUCK BOOST CONVERTER

T103

RT101, RT102

Q114

Q115, Q116

Q117, Q118

2-TRANSISTOR

LADDER

IAC

Q108

PFC

Q101

Q107

U102

RESISTOR

I SENSE

T104

L107

CURRENT MODE

BOOST CONVERTER

DC IN

FWD CONVERTER

U110C

THERMAL

SHUTDOWN

T106PWM OUT

GATE DRIVE

LEVEL SHIFTING

U109

U108

Q104

VOLTAGE SENSE

VDC

VCC

RAMP

Q103

U107

Q105, Q106

BATT BACK-UP

ON/OFF SENSE

+6 to +18V

CR110, CR111

CR101, CR102

BRIDGE RECTIFIER

T101

AC IN

AC SENSE

BUFFER/

HYSTERESIS

AMPSENSOR

TEMP OUT

TEMP

TO REMOTE EN

U106 U101 U110A Q120, Q121U110D

+5V REGULATOR

Figure 6-8 BLOCK DIAGRAM

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CIRCUIT DESCRIPTION

In operation, the power MOSFETs Q116, Q118 are on for approximately one-third of the period providing current to the primary side of T107. During that time CR121 is forward conducting and charging L101. When the MOSFETs are switched off, the magnetizing current of T107 continues to flow through CR118, CR119. These diodes place 400V across the transformer in opposite polarity that resets the transformer core. During the off period CR128 is free wheeling and L101 is discharging. Transformer T107 provides the isolation between the low voltage and high voltage sections.

The +26.5V pulse width modulator is peak current mode controlled. This type of converter requires current and voltage sense. T105, CR112, R125, R146 and C125 provide the current sense circuit. The voltage sense circuit is U109 and the associated circuitry on the isolated side of the supply.

An opto-isolator is used to cross the boundary from high to low voltage sections. In the event of an over-voltage condition (>+32V) U115 and associated components turn the power sup ply of f . This s hutdown mechanism latches the power supply Off. The enable line must be turned Off for 10 seconds for the power supply to reset. T106 has a tap to provide current to the optional battery back-up (Part No. 023-3-2000-

830). The +26.5V is available at the high current output connector to the power supply and it also powers the +15V, +5V and -5V converters through F102.

6.5.4 SYNCHRONIZING CIRCUITS

The +15V and +5V sections run at the same frequency as the + 26.5 V pu lse wi dt h modulator. In order for a beat note not to be produced, a sync circuit is used. If two converters are not synchronized, the difference frequency may show up at an undesired location in the repeater.

Divider R151/R152 samples the output of the main pulse width modulator. When Q116 and Q118 turn on, the output on U104A, pin 3 goes high. C138, R176, CR122 along with U104B creates a very narrow pulse on U104B, pin 6. Q110, Q111 and Q112 level shift and buffer this pulse. When the narrow pulse is presented to the timing capacit or of the +15V and +5V

converters, the cycle terminates and a new one starts. This forces the +15V and +5V converters to run at the same frequency and is slightly delayed from the +26.5V converter.

6.5.5 FAN AND THERMAL SHUTDOW N

The voltage supply to the thermal measurement circuit is generated from transformer T101 and the associated bridge rectifier consisting of CR101, CR102, CR110 and CR111 and bulk storage capacitor C101. This voltage is approximately +9V when the AC voltage is at 120V AC.

NOTE: This DC voltage is depen dant on the input AC voltage.

U106 provides a very accurate +5V required for proper operation of the temperature sense circuit. A precision tempera ture sensor (U101) is mount ed to the +26.5V rectifier heatsink. The output of this sensor is 10 mV/°C with a ±1% accuracy. This voltage is amplified by U110A with precision resistors R183/ R184 setting the gain.

The output of gain stage U110A is fed to the computer interface via WO116 to monitor power supply temperature with the programmer. The output of U110A, pin 3 is also connected to the thermal shutdown circuit U110C, R135, R136, R137, R138 and R139. If the heatsink temperature reaches 92°C (198°F) the output of U110C, pin 8 goes high and saturates Q103. When Q103 is turned on U107 is turned off and the power supply turns off. The remote voltage is always present so when the heatsink temperature drops to 80°C (176°F) the power supply restarts. The high temperature cond ition woul d only ex ist i f the fan was blocked or faulty.

The output of U110A, pin 1 also connects to the fan controller. U110D with the associated resistors provides a means to turn the fan on/off. Transistors Q120/Q121 provide current gain and a voltage level shift to run the fan. The fan turns on when the heatsink reaches approximat ely 45°C (113°F) and turns off again when the temperature reaches 35°C (95°C). In normal operation the fan turns on and off.

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6-22

CIRCUIT DESCRIPTION

6.5.6 +15V CONVERTER

The input voltage to this "Buck" DC/DC converter is the main +26.5V output f use d thr ough F102. The bias voltage for the controller IC U112, pin 15 is provided by a +15V regulator U111. The basic buck converter consists of MOSFET Q125, Schottky diode CR126 and storage inductor L102. C165, C166, C167, L103, C169 and C170 filter the output voltage and attenuate the ripple at the switching frequency (160 kHz). The capacitors are an integral part of the feedback loop. The duty cycle is approximately 60%.

The +15V buck converter is peak current mode controlled. T108 samples the inductor current while MOSFET Q125 is on. The sampled current is translated to a voltage via CR127, R209 and R210.

Because the MOSFET is a high-side switch, a charge pump is required to get the gate voltage above the input voltage. The charge pump operates as follows. When the output from IC U112, pin 14 is low, capacitor C162 is charged through CR124, R198, R199, R200 and Q122/Q123 ar e o ff. When U1 12, pin 14 goes high, the capacitor stays charged and CR124 is reverse biased. Q122/Q123 are turned on forward biasing CR125 and applying a gate-to-source voltage of approximately +12V. During this time Q124 is o f f. When U112, pin 14 goes low, Q124 turns on and rapidly discharges the gate cap acitance.

Resistors R231/R208 cou pled with C164 provide snubbing for Schottky diode CR126.

Because the +15V converter operates at greater than 50% duty cycle, slope compensation is required. Capacitor C176 is the time capaci tor f or t his con verte r and R223 is the resistor that sets the charge current. A sawtooth wave is pr esent on the high side of C176 that is buffered by Q127/Q128. The resistor divider network of R315, R227, R229 and R232 provide the correct amount of compensation for stable operation and current limiting.

The output voltage is sampled by R215, R216 and R217 and sent to the inverting side of the error amplifier i nternal to the controller IC on U112, pin 1. Voltage loop compensation is set by C174, C175 and R221.

Sync pulse is added into the low side of C176 via C172 and R225. The free running frequency of the 15V converter (approximately 145 kHz) is set about 10% lower than the 26.5V convert er. This longer duty cycle allows the sync circuit to synchronize the converter.

Over voltage is sensed using U116 as a reference and amplifier, CR129 acts as a crowbar on the output. Once the crowbar is turned on, opto-isolator U119 is activated to shutdown the power supply. The enable line must be toggled or AC voltage removed for 10 seconds to reset the power supply.

6.5.7 +5V CONVERTER

Operation of the +5V "Buck" DC/DC converter is the same as the +15V, except slop compensation is not required. Some values are different to get the

5.2V DC and current limit to 6A. The duty cycle is approximately 20%.

6.5.8 -5V CONVERTER

The -5V "Buck-Boost" converter scales and inverts the voltage. This converter is free running at approximately 75 kHz. The output switch and controller are built into the 5-leg TO-220 IC U114. L105 is the storage inductor. C204, R270 and R271 close the voltage feedback loop and are set for optimum stable transient response. C208/C209 reduce output ripple. Under-volt age prot ecti on is r equire d on thi s stag e and works the same as the over-voltage protection of the +15V and +5V buck converters, but has opposite polarity.

6.5.9 POWER SUPPLY REPAIR AND ALIGN-

MENT

If a power supply fails it is typically a Power MOSFET or Power Diode. In some cases the MOSFET gate may short and cause some of the driver circuits to be damaged. When replacing heat sunk components it is advisable to replace the sil-pad thermal interface material at the same time. The mounting hardware mu st be replaced exactly as built in the factory. The mounting screws for the power semiconductors MUST BE torqued to 4-5 in/lbs. Under torque and over torque can shorten the life of the semiconductor.

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CIRCUIT DESCRIPTION

The majority of the v oltage and current li mi ts ar e set with fixed value components in the power supply. However, the +26.5V, +15V and +5.2V supplies are adjustable. When certain components are replaced, the voltages must be adj usted . The voltag es shoul d be set at light l oad (i.e. repe ater in the Receive mode).

1. The +26.5V supply can be adjus ted with R174 when

any of the following components are replaced: R173, R174, R175, U109, U108, U102, R143, R170 or R171.

2. The +15V supply can be adjusted with R216 when

any of the following components are replaced: R215, R216, R217 or U112.

3. The +5.2V supply can be a dju sted with R2 54 when

any of the following components are replaced: R253, R254, R255 or U113.

6.6 BATTERY BACK-UP MODULE

6.6.1 OPERATION

When a battery back-up module is installed in a power supply it performs the function of running a repeater in the absence of AC voltage. When AC is present it can be used to charge a pair of lead-acid batteries in series. The charger is a temperature compensated constant voltage charger. The maximum output current from the charger is 2.2A. The charger works when AC is p resent and the repeater is enabled. The charger swit ch on t he battery back-up modul e mus t b e "On". The temperature compensation thermal sensor is part of 023-2000-223 battery back-up module cable assembly.

When AC is low or not applied to the 023-2000800 power supply the battery input takes over if the voltage is within range. The input voltage to the battery back-up module acts as the 26.5V supply and the other voltages in the power supply also are present, +15, +5.2 and -5V. When AC is restored, the battery back-up module disengages automatically. The change over from battery to AC or AC to battery may cause the repeater to reset, depending on battery condition and load status.

6.6.2 CHARGER

The charger charges the batteries when the repeater is on and switch S101 is "on". A tap off of the main transformer of the power supply through wire W104 and a +26. 5V l ine vi a wire W102 are what supply the charger with the necessary voltage to charge the bat teries. The ta p off of the transformer is biased by the +26.5V and then filtered through L101, C105 and C119. Since the tap from the power supply is not a regulated voltage, bleeder resistors R136/ R137 dissipate some power when the batteries are fully charged. No load situation, the peak voltage of the tap is ap proximately 63V, is not impressed across the 50V capacitors C105/C119. During a battery charging condition the line voltage to the charger on U107, pin 2 should be about 35V.

While charging batteries, if the charge voltage is varied with respect to the temperat ure of the batteries, the lifetime of the batteries is increased dramat ically. Figure 6-9 shows the algorithm used in float charge applications for two 12V lead-acid batteries in series. Figure 6-9 shows that the charge voltage should be

27.3V DC ±0.15V at 25°C (77°F) with -55 mV/°C temperature compensation.

An LM317M linear voltage regulator (U107) is used to create the temperature compensated charge voltage. This device is capable of delivering 2.2A of continuous current to the batteries .

To create a temperature compensated voltage an op amp (U104) is used as a voltag e gain devi ce fro m a temperature probe attached to the batteries (part of 023-2000-223). This op amp wit h R148/ R149 defi nes the slope for the algorithm of Figure 6-9. The output of the temperature compensation is attached to the adjust pin of U107. R138-R140 allow the output voltage to be set properly at a given ambient temperature. F101 is a 4A resettable fuse used to prevent thermal run away in the event of U107 failure. If the output current to the batteries exceeds 4A this fuse opens. Once the current drops below 100 mA, the fuse closes automatically.

NOTE: When using a genera tor, the DC voltage must be between 23-28.5V (26.5V DC is recommended) and ripple voltage less than 1% or approximately

0.25V P-P.

August 2000 Part No. 001-2001-200

NOTE: If any of the charging components are replaced, R140 needs to be adjusted to set the output (battery back-up battery terminals) voltage to 27.3V ±0.15V when temperature sensor is at 22°C (71.6°F).

6-24

Charger Voltage

30V

27.3V

25.2V

-55mV/°C

CIRCUIT DESCRIPTION

6.6.4 ENGAGING THE RELA Y

The main purpose of the Battery Back-Up Module (BBM) is that when the power supply loses AC line voltage, a pair of series connected 12V lead acid batteries (approx imatel y 26.4V) or o ther 23-28.5V DC source will engage to the supply allowing the repeater to operate. To perform this function a voltage comparator (U101) is used to monitor the charge tap coming from the power supply.

24V

-30° 0° +30° +60°

+22°

Temp (°C)

Figure 6-9 NO LOAD CHARGE VOLTAGE vs.

TEMPERATURE

6.6.3 REVERSE BATTERY PROTECTION

To obtain reverse battery protection a number of techniques were implemented. Q108/Q110 are arranged in a Darlington configuration to isolate the output capacitors C109-C111 from conducting in the event the batteries are connected backwards. This circuit also provides a means to turn the battery charger off in case the user wants to run the repeater off of another DC source. S101 opens the base of Q105 which turns off Q104. CR111 is a green light emitting diode (LED) located on the right hand side of the battery back-up module when looking at the front of the power supply that tells t he user the cha r ger is in cha rge mode and is marked "On".

To notify the user that the batteries are connected improperly R101/CR101 are connected in series across the batteries. CR101 is a red LED that lights when the batteries are connected backwards and is located on the left hand side of the battery back-up module when looking at the front of the power supply. This LED is marked "Reverse Bat.". CR113 eliminates a path for the reverse battery current through the relay and over/under voltage protection circuitry.

NOTE: Exceeding -30V acr oss the battery back- up terminals with the power supply on will destroy Q105.

A 2.5V reference voltage is supplied to the comparator from U102. The transformer tap voltage is smoothed and divided by CR114, C118, R116, R121 and R122. The values for these components were calculated so that when the AC line voltage is dropped to 70V AC, the output of the comparator turns Q103/ Q102 on which in turn engages the relay K101. The relay is capable of 30A which delivers the battery energy to the power supply via W102 with the return line being W103.

NOTE: When AC is r estored, the relay disengages and the charger automatically begins to charge the batteries.

6.6.5 OVER/UNDERVOLTAGE SHUTDOWN

U101 is a quad comparator IC used to create the overvoltage and undervoltage shutdown circuitry. If the batteries are drained sufficiently enough such that the voltage of the batteries drops below 20.3V DC the output of the comparat or goes low a nd turns Q10 2 off . By turning Q102 off the batteries are switched out of the circuit. The ba tt er ies cannot be switched bac k into the repeater until the voltage rises to 22.6V DC. This operation is in place to protect the repe at er and the batteries. In the event the batteries are over charged, or the repeater is driven by the generator that has the voltage set too high, the relay will disengage above

30.5V DC. In order to switch the batteries back to the repeater, the voltage must drop below 29V DC.

In an overvoltage or undervoltage situation, whether AC is present or not, the red LED (CR105) lights until the problem is rectified. This light is located on the right-hand side of the battery back-up module when looking at the front of the power supply and is marked BAT-BAD.

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CIRCUIT DESCRIPTION

6.6.6 BBM FAN CONTROL

The voltage supply to the t hermal measu rement circuit is taken from the 26.5V DC li ne into the BBM. A precision temperature sensor U106 is mounted on the PC board near a screw into the BBM bracket which transfers heat to the sensor. The output of this sensor is 10 mV/°C with a ±1% accuracy. This voltage is amplified by U105 with resistors R153/R154 setting the gain.

The output of this gain stage (pin 1) is fed to another gain stage that performs as a comparator. The output (pin 7) will go high when the heatsink temperature reaches 45°C and will go low when the temperature goes below 35°C. This output is sent to the power supply through Q106 to turn the fan on and off.

6.7 CARD RACK

The card rack provides slots for up to eight logic cards; including Main Processor Card (MPC), Main Audio Card (MA C) and the Int erface Alarm Card (IAC). The IAC has a notch in the card to accommodate a pin in Slot-8 so that no other card can be plugged into this slot.

On the back of the card rack is the Backplane with plug-in connectors to the cards and cables to the RF modules, Power Supply and External Connector Board.

Refer to the component layout and schematic diagram in Section 10 for mo re information on the repeater backplane.

August 2000 Part No. 001-2001-200

Figure 6-10 BACKPLANE CONNECTORS

6-26

6.8 EXTERNAL CONNECTOR BOARD

The external connector board (A10) is the interface for the alarm outputs, connecting repeaters through the high speed data bus.

ALARMS

TO CARD RACK

P10

CIRCUIT DESCRIPTION

A10

EXTERNAL

CONNECTOR

BOARD

REPEATER I/O

TO CARD RACK

P11

HIGH SPEED

DATA BUS

A-

Figure 6-11 EXTERNAL CONNECTOR BOARD

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

P2-0 P2-1 P2-2 P2-3 P2-4 P2-5

TxD0

RxD0

P1-6 CTS0 TxD1

RxD1

CTS1

P1-0

P1-1

P1-2

P1-3

P1-4

STAGING

LATCH

PROGRAMMABLE

DMA

CONTROLLER

SERIAL

COMMUNICATION

INTERFACE

BAUD RATE

GENERATOR

PROGRAMMABLE

INTERRUPT

CONTROLLER

X1 X2

CLOCK

LC etc.

PSW

ALU

INT RAM

256 BYTES

MACRO SERVICE CHANNEL

INSTRUCTION DECODER

MICRO SEQUENCER

MICRO ROM

LATCH

INT ROM

16K BYTES

QUEUE

ADM A19-A0

PFP

INC

RESET P2-6

P2-7

P1-7 MSTB MREQ R/W IOSTB EA

BUS CONTROL LOGIC

P1-4

D7-D0

16-BIT TIMER

P1-5 REFRQ P0-7

TIME BASE CONTROLLER

P0 P1 P2 PT0-PT7

Figure 6-12 U27 BLOCK DIAGRAM

6.9 MAIN PROCESSOR CARD

6.9.1 INTRODUCTION

The Main Processor Card (MPC) connect s to the computer with repeater software to program the repeater parameters, sets and reads the alarms, handles communication between repeaters, maintains the audio gating for the MAC, handles initialization requests from cards and contains the repeater RF data for the Receiver, Exciter and CWID .

PORT

PORT WITH

COMPARATOR

Control function s for ea ch repea ter are performed by the Main Processor in the MPC installed in each repeater. The MPC contains the main software and control over the repeater via microprocessor U27 (see Figure 6-17).

Information is excha nged betwe en repeate rs via a High-Speed Data Bus (HSDB) that interconnects all the MPCs. This control technique is c alled distributive processing and it eliminates the need for a separate system controller at each site. The HSDB processor (U13) on the MPC provides these control functions. The MPC also contains:

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6-28

CIRCUIT DESCRIPTION

• Flash Memory, RAM , non-volatile EEPROM.

• I/O chip select to allow the addressing of data

latches for Input/Output.

• Read/Write sele ct ion t o be s ent a nd rec eiv ed on the

Controller Backplane.

• Clock line, data line and chip select line from the

IAC to load the Receiver and Exciter synthesizers .

• Serial communication circuitry and processes for

the High Speed Data Bus (HSDB).

• Asynchronous parallel communication to the other

cards, i.e. alarm input and output circuitry.

• AC Power Failure indication from the IAC.

• Provides an output from the IAC to the power

amplifier to control the output power.

• Exciter Logic Push-To-Talk (PTT).

• Receiver synthesizer lock, Exci ter synthesizer lock ,

thermal level from the power amplifier, VSWR level from the P A, forwar d power level, RSSI signal level, audio levels from the MAC, Receiver and Exciter from the IAC.

6.9.2 MAIN CONTROLLER MICROPROCESSOR

peripherals. Internal RAM and the SFR area are together and can be relocated anywhere in the 1Mbyte address sp ace . This maintains compatibility with existing system memory maps.

The two microprocessors and USART (U22) are reset by integrated circuit U17. Reset occurs when power is turned o n, when t he 5V su pply dr ops bel ow a threshold level or the reset switch (S1) is active.

When a microprocessor is reset, several internal registers are cleared an d the progra m is started ov er from the beginning. Low-voltage reset prevents improper operation resulting from low-voltage conditions.

When power is turned on, the RESET output U17, pin 6 is initially high and the inverted RESET output U17, pin 5 is in it ially low. Once the 5V supply stabilizes, these outp uts remain in these states for approximately 100 ms to ensure that reset occurs.

This time delay is set by capa citor C14 conn ected to U17, pin 3. If the 5V supply drops below a nominal level, the RESET outputs change states and microprocessor operation is interrupted until the 5V supply returns to normal. C3 prev ents fast transients on the 5V supply from causing reset.

Manual reset can be accomplished by pressing push-button switch S1. When U17, pin 2 goes low, U17 goes into the reset sequence described.

U27 contains the main software and control over

the repeater (see Figure 6-12).

The main controller (U27) is a VLSI (Very Large Scale Integration) CMOS 16-bit single chip computer with an 8-bit external data bus. This processor has software compatibility with the V20 (8086/8088), faster memory access, superior interrupt processing ability, and enhanced control of internal peripherals. This ROMless processor has a variety of on-chip components including 256 bytes of RAM, serial and parallel inputs/outputs, comparator port lines and timers.

Eight banks of registers are mapped into internal RAM below an additional 256-byte special function register (SFR) area that is used to control on-chip

6.9.3 HIGH SPEED DA T A BUS MICROPROCESSOR (U13)

The HSDB processor (U13) on the MPC provides the interface with the HSDB. It monitors data on this bus and al so transmits data on to this bus when necessary. Information on this bus indicates which repeaters are in use and also which mobiles are using the system. This info rmation i s used by t he repeat er to encode data messages to the mobiles that are monitoring that channel. These messages also include information on which repeater is free and current syst em priority.

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Part No. 001-2001-200

CIRCUIT DESCRIPTION

Microprocessor U13 is an 8052 tha t uses exter nal EPROM (Erasable Programmable Read Only Memory) U14, an 8-bit devic e that store s the p rogram. Th e microprocessor uses 2k x 8 EPROM and 64k x 8 RAM. The RAM (Random Access Memory) is used for temporary data sto r age. The HSD B processor is configured by the Main Processor.

The internal data bus of the microprocessor has four input/output ports. These ports have eight lines each, giving a total of 32 input/output lines. These ports are designated P0, P1, P2, P3. P0 is used as a data bus. Ports P1 and P2 are always used as general purpose inputs/outputs. P3 is used for specialized functions, i.e. a serial port (RxD/TxD) and interrupt (INT).

The operating speed of the microprocessor is set by an 11.059 MHz cl ock gene rat ed by Y2. This clock frequency is divided down by an internal divider to provide a machine cycle time of 1.08 µs. Most program instructions are executed in one machine cycle and none require more than four machine cycles.

Pins 1-10 ADDRESS BUS Pins 33-42

This provides a path between the MPC main processor and the external memory on the MPC and the other cards in the Controller. This bus retrieves information programmed into memory for the operatio n of the repeate r.

Pins 11-14 DATA BUS Pins 43-46

The data bus provides a means of transferring data to and from the CPU on the MPC, memory storage on each card and peripheral devices in and out of the MAC and IAC.

Pin 15 MREQ

MREQ is a memory request line operates in conjunction with the Read/Write lines. These provide the ability to read from or write to the main processor memory on the MPC.

The microprocessor U13 communicates with the main processor (U27) through U9 and U10. U9 is a Transmit FIFO (First In First Out) and U10 is a Receive FIFO. This combination makes up an asynchronous parallel-to-parallel interface to the Main Processor.

Microprocessor U13 al so calculates the curren t system priority for the channel. This priority is from the programming software responses and the curr ent priority is sent to the main processor. U13 also reads repeater number and channel number information in memory. U13 also determines the current free repeater and includes that information in the data sent to the Main Processor.

6.9.4 CHIP SELECT DECODERS (U15/U4)

Chip select decoders se lect the peripheral chip to read from or write to.

6.9.5 P1 SIGNAL CONNECTOR

Pin 16 MSTB

MSTB is a memory strobe line used during MPC main proces sor Read/Write operations to external memory on the MPC and other cards plugged into the backplane.

Pins 17-20 UNUSED

Pin 21 LPTT

Pins 22-23 UNUSED

Pins 24/56 HSDB+/HSDB-

This is the signal interface connector P1 (64 pin) that connects the Address and Data buses and control lines to the backplane connector.

August 2000 Part No. 001-2001-200

This interc onnects all repeaters to provide an exchange of information. This control technique is called distributive processing and eliminates a separate system controller at each site. Information on this

6-30

CIRCUIT DESCRIPTION

bus indicates which repeaters are in use and also which mobiles are using the sys tem. This informati on is used by the repeater to encode dat a messages to the mobiles that are monitoring that channel. These m essages also include information on which repeater is free and cur rent system priority.

Pins 25-26 UNUSED

Pins 27/59 -5V IN

This is the -5V input to the MPC from the power

supply via the Controller backplane.

Pins 28-29 +5V IN Pins 60-61

This is the +5V inp ut to the MPC from the power

supply via the Controller backplane.

Pins 30/62 +15V IN

This is the +15V input to the MPC from the

power supply via the Controller backplane.

Pins 31-32 GROUND Pins 63-64

This is the ground connection to the MPC from

the power supply via the Controller backplane.

6.9.7 J2 MEMORY SELECT

J2 is jumpered to select ei ther the Flas h memory or the EPROM memory. Flash memory is ultra-fast data storage. The normal setting is pin 1 to pin 2.

Pin 1 +12V Pin 2 U25, pin 1 Vpp Pin 3 +5V

6.9.8 J3 BAUD RATE

J3 is jumpered to select the baud rate from the computer to the MPC, these two baud rates must be the same (see Figure 6-17). The baud rate of the computer can be found from the command line by requesting /b, /h or /? (see Section 3.1.5). To change jumper J13: Power off the station. Move P3 to the proper rate. Power on the station.

6.9.9 S2/S3 HSDB SETTINGS

These switches configure; the HSDB for RS-485 or single-ended 5V operation, indicate if the Summit repeaters are connected to existing repeaters or only Summit repeaters, and if the repeater is an end repeater termination. Refer to Sections 2.9 and 7.4.8.

Pin 47 READ

Read is used with the MREQ line to read data

from the main processor and external memory.

Pin 48 WRITE

Write is used with the MREQ line to wri te data to

the main processor and e xternal memory.

Pins 49-55 UNUSED Pins 57-58

6.9.6 J1 COMPUTER CONNECTOR

J1 is the MPC connection to the computer or

modem.

Pin 1 Ground Pin 2 Computer Tx Pin 3 Computer Rx Pin 4 Modem DCD

6.9.10 J4 EPROM MEMORY LOADING

This jumper selects EPROM memory loading for LTR systems. The LTR setting is pin 3 to pin 4.

6.9.11 J5 HSDB SPEED

J5 is jumpered to select the data bus speed. J5, pins 2/3 select the LTR 12 MHz crystal.

6.9.12 J6 WATCHDOG

This jumper enables or disables the watchdog timer for reset. Normal operating mode is P6 jumper ing J6, pins 2/3. This jumper should not be moved or removed.

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CIRCUIT DESCRIPTION

6.10 MAIN AUDIO CARD

6.10.1 INTRODUCTION

This control card stores the information required to operate the routing of audio and data from the inputs of the repeater to the outputs. Data is received on the address bus from the MPC for the operations to perform. The Audio/Data microprocessor and the latches open and close gates to route a path for the audio or data.

Audio control functions for each repeater are performed by the Main Processor in the MPC. The MPC contains the software and maintains control over the repeater via microprocessor U27. The audio/data microprocessor passes received data to the main processor, and it is given the programmable parameters for the gates.

Information is exchanged between the cards in the Controller Backpl ane via a data bus a nd an add ress bus. The address bus provides the link between the main processor and t he chip and the addres s latc hes on the MAC. These latches control the octal latches that select the audio and data gates. The data bus is the link between the Main Processor and the Audio/Data Processor on the MAC. The Main Processor controls the data to the octal latches and opens and closes the gates required to route audio/data in and out of the repeater. The MAC also contains:

• The audio interface between the receiver and exciter

and to the external connections.

• The receive audio filtering with de-emphasis.

6.10.2 AUDIO/DATA MICROPROCESSOR

This Audio/Data microp rocessor is o n the MAC card and is used to deco de LTR data received from the mobiles. The LTR data is applied to U111, pin 8 (P1.7 input). When a word is successfully decoded the data is then sent to U161 (Tx FIFO) and transmitted on the data bus in parallel to the main processor on the MPC.

When it is time to transmit the CW Identification, the main pro cessor on the MP C sends the ide ntification to U111 via the data bus and U160 (Rx FIFO). The CWID is sent to the Tx Data Amplifier and Filter. The output of the f i lter is summed with the transmit audio and sent to the Exciter.

U111 also uses six octal latches to provide additional input and output lines. Latch U107/U108 provide outputs which allow U111 to control various audio gates. Thes e gate s cont rol t he CWI D, FSK da ta, and receive/transmit audio signals.

Latch U106 provides outputs which allow U111 to route signals to the Audio/Data Test Point by switching gates on and off. U106 also provides adjustment of the selected EEPOTs.

U155-U156 allow U111 to select the EEPOT to adjust with chip select lines. These latches also provide routing of some audio/data signals through gates.

In addition, U111 controls the receive and transmit audio gates, receiver squelch, several front-panel indicators, and oth er funct ions. U1 11 encodes the data messages transmitted to mobiles monitoring that channel, and controls transmitter keying.

• The squelch filter and detector.

• Slow decay timing circuit that controls a mute gate

on the main receive audi o.

• A filter, DC restoration and slicer circuitry for

detecting the subaudible data.

• The fast squelch and data fed to the mi cropro ces sor

that decodes the data and uses the squelch line as a data qualification signal.

• Transmit au dio filter and limit er wit h pr e- emphasis.

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6.10.3 RECEIVE AUDIO

The Receive Wide Band Audio (RX WBAND) signal from the Receiver is fed into the MAC on P100, pin 27. This audio signal includes; audio, LTR data, and noise. The audio processing circuit provides filtering and amplification of the audio signal before it is routed to the outputs on the MAC card.

A low-pass filter consisting of U121A/B atte nuates frequencies above 3 kHz. This removes high-frequency noise from the audio signal. From the filter the signal is fed to amplifier U122A to increase the level before the high-pass filter to preserve adequate hum and noise ratio.

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CIRCUIT DESCRIPTION

From the audio amplifier the signal is fed to a high-pass filter consisting of U122B/C/D. This filter attenuates frequencies below 300 Hz which removes data present in the wide band audio signal. These filters are configured to act like large inductors. The signal is then fed to U163A which provides 6 dB per octave de-emphasis.

Audio gates U113B/C/D permit noise squelch circuit, control logic, and audio switch to control gating of the audio signal. The control signal from the noise squelch circuit is applied to U113B through U113D. When a carrier is detected, this input is high and U113B passes the signal. Programming determines the gating of audio. When audio is passed by U113B/ C and U114A, the audio can be routed through other gates to various outputs (see Section 6.10.6).

6.10.4 RECEIVE SQUELCH CIRCUITRY

The receive wide band audio inclu des audio, data and noise. The squelch circuit detects this noise to determine receive signal strength. When no carrier or a weak carrier is received, there is a large amount of noise present. Conversely, when a strong carrier is present, there is very little noise present.

U135A is a high-pass filter which attenuates frequencies below approximately 30 kHz so that only high-frequency noise is passed. This noise is amplified by U135B and U123A. A level control adjusts the gain of amplifier U135B. The gain of U123A is partially set by a thermistor to compensate for circuit gain and noise level changes caused by temperature variations.

The amplified noise is then applied to a bridge rectifier. The difference between bridge rectifier outputs is applied to the inputs of U123B. The output of U123B is positive-going pulses. These pulses are applied to U123C which is a Schmitt trigger. When the input signal rises above the reference the output goes low and causes the reference voltage to decrease slightly ad ding hysteresis to the tri ggering level. This hysteresis prevents intermittent sque lching when th e receive signal strength is near the threshold level.

The output of U123C is applied to U123D and Logic Squelch to Audio/Data Gate U159B and audio/ data processor U111. Gate U159B routes the squelch

output to th e Audio/Data Test Point J100. U123D functions as a timing buffer. The output of U123D is applied to Receive Squelch Active Gate U113D. When this gate is closed, the squelch circuit controls Normal Receive Gate U113B to block receive audio if no signal is present.

6.10.5 RECEIVE DATA CIRCUITRY

The receive wide band audio signal is the unfiltered output of discriminator U202 in the Receiver. Therefore, this signal contains audio, LTR data, and noise. A low-pass filter formed by U124A/B attenuates frequencies above 150 Hz by 24 dB per octave so that only the data freque nci es are passed. From the filter the signal is fed to amplifier U125A. The gain of U125A is adjusted by a level control. The output of U125A can be routed through Data To Audio/Date Gate U159C and the Audio/Data Test Point J100.

DC restoration circuit converts the data signal from AC floating near ground to a digital signal at levels of 0 and 4.5V. U125B/C provide the reference voltage on the inverting input of comparator U125D. Positive peak detector U125B handles the positivegoing peaks of the data s ignal. Negati ve peak de tect or U125C handles the negative-going peaks of the data signal.

The voltage on non-inverting input to U125D is midway between the positive- and negative-going peaks. The data input is on the non-inverting input of U125D. When the data signal rises above the reference voltage, the output goes high. Conversely, when the input voltage drops below the reference voltage, the output goes low. The receive data is then passed to audio/data processor U111.

6.10.6 RECEIVE AUDIO PROCESSING

The receive audio signal is fed into the MAC on P100, pin 27. When a mobile-to-mobile call is received, Repeat Gate U153C is enabled and the receive audio signal is routed through T ran smit Option Gate U158C to the input of the transmit audio buffer U164B to be retransmitted. Repeat Gate U153C is controlled by processor U111 through latch U107. A logic 1 on the control input causes the signal to be passed.

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CIRCUIT DESCRIPTION

When the received audio must be routed to the backplane (i.e. for other cards), Receive Voice Gate U115B is enabled by processor U111/latch U108 and passes the audio signal to amplifier U120B. Receive To Backplane (RX TO BP) U115C is enabled and passes the amplified audio to the backplane.

When the audio received must be routed to the external speaker or speaker/microphone, Local Audio Mute Gate U114D is enabled by U111/latch U108. The audio is passed to local audio output amplifier U132. The gain of U132 is adjusted by the local audio volume control and on/off switch.

6.10.7 VOTER AUDIO

When used, the Receive audio from the voter receiver comes into t he MAC on P10 0, pi n 25 . Ampli fier U120A sets the gai n of t he si gnal and the output is routed to Voter Audio Mute Gate U115A. The gate is controlled by A/D processor U111/latch U108. If the gate is enabled, the audio goes to the Receive Mute Gate U113C and passes throughout the MAC Card.

6.10.8 COMPANDOR OPTION

microphone PTT switch is pressed. This prevents interference if the microphone remains live when the PTT switch is pressed.

Buffer U164B combines the microphone audio signal from U164A with the audio signal from the Repeat Gate U153C.

U127B/C form a high-pass filter that attenuates frequencies belo w 300 Hz t o pr event interference wit h the LTR data applied at U129B. Pre-emphasis at 6 dB per octave is provided by an RC combination before the signal is fed to the Limiter U127D.

Limiter U127D and rectifiers form a precision limiter which prevents over modulation caused by high-level input si gnal s. With normal input levels, the output of a bridge rectifier follows the input of the bridge. When a high-level signal is applied to the bridge, the bridge op ens and t he output of the b ridge is limited to a specific level.

The output of the limiter passes to a composite 6pole splatt er filter formed by U127A , U128D and U128A separated by buffers U128B and U128C.

The compandor option enhances the receive and transmit audio when use d in conjunction with th e Telephone Interface Card (TIC) in LTR systems.

The filtered Receive Audio passes through the Receive Mute Gate U113C to the expander input on A301, pin 1. The expand output of A301, pin 2 is coupled to the audio outputs by U114C.

The TX-VOICE from P100, pin 32, passes through TX Voice Gate U158A to the expander input on A301, pin 5. The compressed output of A301, pin 4 is passed to the TX Audio Buffer.

6.10.9 TRANSMIT AUDIO

PTT switch (Q101/Q102) provides local microphone Push-To-Talk (PTT) indication to U105. U105 then tells U111 via the data bus that the local microphone PTT has been activated.

U164A amplifies the microphone audio signal to provide the correct input level to U164B. Local Microphone Mute Gate U117C is controlled by A/D processor U111/latch 106. The function of U117C is to mute the local microphone audio when the local

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The output from U128A is fed to Normal Modulation Mute Gate U118B that is controlled by A/D processor U111/latch U106. When enabled, the gate passes transmit audio to EEPOT U149. U149 is an electronically ad just able pot entio meter th at ad justs the gain of transmit audio amplifier U129C. The gain of U129C can only be adjusted through the software. Therefore, a computer must be attached to the MAC card when levels are set.

The output of U129C is fe d to s umming ampli fier U129B where it is combined with LTR transmit data and CWID when present. The gain of audio and data are the same so unity gain is produced. The output signal is fed to the TCXO where it frequency modulates the tra nsmit signal.

6.10.10 TRANSMIT AUDIO PROCESSING

Transmit voic e from t he backpl ane comes into t he MAC on P100, pin 32. When used this signal passes to the transmit voice amplifier U130A. The output level of the amplifier is a djusted by a level control. The output of U130A is applied to another transmit voice amplifier U130B and Transmit Voice Gate U158A. U158A is controlled by A/D processor U111/

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CIRCUIT DESCRIPTION

latch U107. When enabled, the gate passes the voice to Transmit Option Gate U158C and on to the transmit audio buffer U164B. T rans mit Voice amplifier U130B is adjusted by a level control. The output is fed to Transmit Net Gate U153B. Gate U153B is controlled by A/D processor U111/latch U155.

6.10.11 TRANSMIT DATA AND CWID PROCESSING

The data signal is produced by A/D processor U111 on Transmit Data and Transmit Shape outputs. The transmit shape output is normally the opposite logic level of the transm it data outpu t when data is transmitted. However, the bit before a logic transition occurs, the transmit shape output is the same logi c level as the transmit data output. This results in a logic 1 level that is slightly higher and a logic 0 that is slightly lower. This pulse shaping minimizes interference between data bits when the data is filtered by the low-pass filter.

The data from U111 is fed to buffer U126A and Transmit Data Enable Gate U117B. Gate U117B is controlled by A/D processor U111 directly. When enabled this gate passes the data to EEPOT U151. U151 is an electronically adjustable potentiometer that adjusts the gain of transmit audio amplifier U126B. The gain of U126B can only be adjusted through the software. Therefore, a computer must be attached to the MAC card. U126B provides the required signal level at the output of the low-pass filter. A relatively stable DC bias voltage for U126C/D is required because these stages are DC coupled to the transmit TCXO (see Section 6.2.3) and changes in bias voltage can cause fluctuations in the transmit frequency.

U126C/D fo rm a low-pass filter that attenuates square-wave harmonics in the data signal above 150 Hz to prevent interference with the audio band. From this filter th e signal is fed to summing amplifier U129B and combined with the transmit audio sign al. The output of U129B is fed to Transmit Modulation Mute Gate U118D. This gate is controlled by A/D processor U111/latch U106. When enabled, transmit audio and data are passed to the Exciter modulation input and the transmit TCXO.

U111/latch U106. When enabled, this gate passes the modulation on pin 11 to the summing amplifier U129B and gate U118D to the modulation in put of the Exciter.

The repeater on the lowest frequency channel in each system must periodically transmit the station call letters as a continuous-wave identification encoded by Morse Code. This identification is programmed with the Edit Parameters software.

The CWID output is control led by A/D pr ocessor U111/latch U107. This output is fed to CWID tone generator U100B/A and turns the tone generator on and off to create the Morse Code. From the tone generator the signal is fed to bandpas s fil t er U129A. This filter passes the 800 Hz fund ament al present in the signal. The output of the filter is jumpered by P106 on J106, pins 2/3 and P107 on J106, pins 4/5 to the summing amplifier and applied to gate U118D, and to the modulation input of the Exciter.

The input and output c onne ct ors for the MAC are defined as follows.

6.10.12 P101 SIGNALING CONNECTOR

The signal interface connector P101 (64 pin) connects the Address and Data buses and control lines to the backplane connector. See Figures 6-18 and 6-19.

Pins 1-10 ADDRESS BUS Pins 33-42

This provides a path between the MPC main processor and the processor and memory of the MAC. This bus retrieves inform ation program med into memory for the operation of the MAC.

Pins 11-14 DATA BUS Pins 43-46

This data bus provides a means of transferring data to and from the processor on the MAC with peripheral devices in the MAC.

Pin 15 MREQ

When needed the External Modulation input on P100, pin 11 is fed to External Modulation Mute Gate U118C. Gate U118C is controlled by A/D processor

A memory request line operates in conjunction with the Read/Write lines. These provide the ability to read from or w rite to the processor memory.

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CIRCUIT DESCRIPTION

Pin 16 MSTB

The memory strobe line is used for MAC proces-

sor Read/Write operations to external memory.

Pins 17-20 UNUSED

Pin 21 LPTT

The Logic Push-To-Talk is not used.

Pins 22-23 UNUSED

Pins 24/56 HSDB +/-

The High Speed Data Bus interconnects the Viking VX repeaters. A 50 ohm termination is required if Viking VX repeaters are used with existing repeaters and the interface.

Pins 25/57 IRDB +/-

This data bus interconnects all repeaters to provide an exchange of programming information with the programming software and computer. This data bus allows all repeaters to be accessed without having to connect the computer to the MPC on each repeater individually.

Pin 26 TLA DB

Pins 31-32 GROUND Pins 63-64

This is the ground connection to the MPC from

the power supply via the Controller backplane.

Pin 47 READ

Read is used with the MREQ line to read data

from the processor and ex ternal memory.

Pin 48 WRITE

Write is used with the MREQ line to writ e data to

the processor and external memory.

Pins 49-55 UNUSED

Pin 58 VOTER DATA IN

This is used in a Voter system. Data from the

voter site is injected at this pin.

6.10.13 P100 EXTERNAL OUTPUTS

Connector P100 contains the audio and data outputs to the terminal block on the back of the Repeater cabinet. These outp uts are connected to ot her ext er nal devices. The input and output connectors for the connector are defined as follows.

The Trunk Line Accounting Data Bus is used for

telephone in terconnect calls.

Pins 27/59 -5V IN

This is the -5V input to the MPC from the power

supply via the Controller backplane.

Pins 28-29 +5V IN Pins 60-61

This is the +5V input to the MPC from the power

supply via the Controller backplane.

Pins 30/62 +15V IN

This is the +15V input to the MPC from the

power supply via the Controller backplane.

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Pins 1-6 UNUSED

Pin 7 3.5V

This is the 3.5V DC TCXO reference voltage from the Exciter to the MAC.

Pin 8 TX DATA OUT

This output contains trunking sign al ing data and CWID data when enabled at jumper J106 and used with external optional equipment.

Pin 9 TX DATA IN

This input would normally contain trunking signaling data, CWID data, and an externally summed in signal. This input is enabled at J106 and is used with external optional equipment.

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CIRCUIT DESCRIPTION

Pin 10 EXT REQ1

This input provides for external requests from

optional equipment.

Pin 11 EXT MOD

This input provides for external wide band modulation of the Exciter with out any filtering. This input is not used at this time.

Pins 13-26 UNUSED

Pin 27 RX WB AUDIO

The Receive W ide Band Audi o from the Rece iver audio demodulator through the RF Interface Board. The typical amplitude is 387 mV RMS (-6 dBm) and 2V DC with Standard TIA Test Modulation into the receiver.

Pin 28 A D LEVEL

6.10.15 J101 SPEAKER/MICROPHONE

This jack is used in con junct ion wit h J102 when a combination speaker/microphone is used during setup and testing of the repeater.

6.10.16 J102 LOCAL MICROPHONE

This jack is used for a microphone to key the Exciter and inject transmit audio.

6.10.17 J103 GROUND

This jack provides a ground connection for the MAC when monitoring the test points.

6.10.18 J104 EXTERNAL SPEAKER

This provides an external speaker connection at the repeater site for monitoring.

6.10.19 J105 WATCH DOG

This is the Audio/Data Level output.

Pin 29 TX MOD

The output of this pin is produced by audio and data inputs to the Repeater to produce the signals on this pin. This signal goes through the RFIB and then to the Excite r.

Pin 30 UNUSED

Pin 31 RX VOICE

This is receive audio output connected to the backplane.

Pin 32 TX VOICE

This is transmit audio input connected to the repeat gate.

6.10.14 J100 A D LEVEL TEST POINT

J105 enables or disables the watchdog timer for reset. Normal operating mode is P105 jumpering J105, pins 2/3. Do not move or remove this jumper.

6.10.20 J106 TX DATA PATH

Jumpers P106/P107 connect J106, pins 1-2 and 34 for external options that need the Tx Data signal. Normal operation connects J106, pins 2-3 and 4-5.

6.10.21 A301 COMPANDOR CONNECTIONS

EP101 Expand In EP102 Expand Out EP103 Ground EP104 Compress Out EP105 Compress IN EP106 +5V

This test point located on the front card edge is

used during alignment to monitor audio and data.

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CIRCUIT DESCRIPTION

6.11 INTERFACE ALARM CARD

This card utilizes the information required to operate the alarms designated in the programming of the repeater. Data is received on the address bus from the MPC for the; operation to perform, the processor and external memory, open and close relays on the outputs, and receive alarm indications on the inputs. This information is either rout ed to ext ernal devices or alarm outputs can be wir ed t o al ar m i npu ts (see Figure 4-10).

The Interface Alarm Card (IAC) contains 4-input contacts and 4-output contacts. The 4-inputs can be disabled, energized or de-energized. The 4-output relays are dry contacts that have a 2A rating and can be either normally open or normally closed.

The electromechanical relay outputs are comprised of eight SPDT (normally open) relays. The relays are all open at power-on. Data to the relay is latched by a write to the base address.

The IAC acti vates relays when alarm trigger events occ ur. The IAC monitors fo r alarm activity in the system and can set the various output relays as defined by the user during programming. When an external alarm i s set i t can be moni tore d from a remot e location. Refer to Section 4.3.3 for alarm programming.

The isolated inputs are dr iven by eit her AC or DC signals. The active high inputs can be set by switches to be polarity sensitive, non-polarity sensitive or add a resistance in series to dissipate unused power (see Figure 6-15).

The active low inputs can also be set for either +5V or +15V operation when a ground closure is required to provide an active alarm.

SQ E

COM

SYNC

OUT

COM 54

COM

I/0 13

RX VO

OICE

ALARM IN

EXTOU

COM 49

ALARM OUT

Figure 6-13 4 I/O J1 ALARM OUTPUTS

6.11.1 RELAY OUTPUTS

The alarm relay outputs are provided via a terminal block on the back of the repeater (see Figures 6-13 and 6-14).

The alarm outputs are on the termi nal bl ock at th e rear of the repeater.

6.11.2 ISOLATED INPUTS

The isolated alarm inputs are provided via a terminal block on the back of the repeater (see Figures 613 and 6-14).

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6-38

2 IN +

UT +

FAI

N -

2 IN -

1 OUT -

2 OUT -

Figure 6-14 4 I/O J2 ALARM OUTPUTS

2 OUT +

CIRCUIT DESCRIPTION

Standard 12V/24V AC control transformer outputs can be accepted as well as DC voltages. This input voltage range is 5-24V RMS. External resistors connected in series may be used to extend the input voltage range.

ALARM +

ALARM -

P500

+15V

8+5V

+5V

Figure 6-15 S500-S503

6.11.3 ALARM INDICATORS

There are three forms of alarm indica tors from the repeater. One form is the two red LEDs and display combination on the MPC. Refer to Table 1-2 for the combinations and definitions of the active alarms.

1 is fed back to the input alarm 1 of Repeater 1. Then the RF Shutdown alarm (#32) is ma pped for alar m 1 in each repeater. This configuration allows Repeater 2 to give an alarm when Repeater 1 has an RF Shutdown alarm output, etc.

The input alarms are given a 15-character description during programming and a Transmit ID. These are used when an input alarm is activated to send a Morse code message consisting of the description over the air to a monitoring transceiver programmed with this ID.

There are 40 internal alarms that can be included in the output alarm configuration (see Table 1-2). These alarms can also be programmed to send an output as shown in the cross refe re nce scre en of the al arm configuration menu (see Figure 4-10). Among these alarms are the thermal sense from the PA and the AC fail alarm output on the terminal block at the rear of the repeater to activate the battery backup.

Another form is the output relay to the terminal blocks at the rear of the repeater where outputs can be wired to external devices or to alarm inputs.

The third form is the output relay and to transmit a 15-character description of the alarm over-the-air to a remote location. The description is sent in Morse code with a transmit I D assigned during p rogramming. A transceiver program med with this ID can monito r the repeater and aler t the sys te m own er wh en an al arm occurs.

6.11.4 ALARM FUNCTIONS

The alarms can be configured in various mode s to alert the system owner to conditions and hazards with the equipme nt and the repeater site facility. A few of the possibilities are shown in Figure 6-16. In this example the input alarm 2 of Repeater 1 is connected to the door of the bui lding , inp ut alarm 3 of Repeate r 5 is connected to the fire alarm system, the AC fail alarm (#16 see Table 1-2) is mapped to alarm 2 output so it can be transmitted (see Figure 4-10) and the output alarm 1 of Repeater 1 is connected to the input alarm 1 of Repeater 2 and so on until the output alarm

TRANSCEIVER

AC FAIL

DOOR OPEN

REPEATER 1

REPEATER 2

REPEATER 3

REPEATER 4

REPEATER 5

SENSOR ACTIVE

ALARM 2 IN

ALARM 1 IN

ALARM 1 OUT

ALARM 1 IN

ALARM 1 OU T

ALARM 1 IN

ALARM 1 OU T

ALARM 1 IN

ALARM 1 OU T

ALARM 1 IN

ALARM 1 OU T

ALARM 3 IN

Figure 6-16 ALARM EXAMPLE

SECURITY DOOR

SMOKE

DETECTOR

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CIRCUIT DESCRIPTION

6.11.5 P500 SIGNALING CONNECTOR

The input and output connectors for the IAC are defined as follows. The signal interface connector P500 (64 pin) connects the Address and Data buses and control lines to the backplane connector. See Figure 6-20.

Pins 1-4 ADDRESS BUS (A12-A19 Only) Pins 33-36

This address bus provides a path between the MPC main proc essor and the latches and multiplexers of the IAC. This bus retrieves information programmed into the MPC memory for the operation of the IAC.

Pins 5/37 ALARM 1 IN +/ALARM 1 IN -

This is an input received from a connection to an external device as a specific alert condition.

Pins 6/38 ALARM 2 IN +/ALARM 2 IN -

This is an input received from a connection to an external device as a specific alert condition.

Pins 11-14 DATA BUS Pins 43-46

This data bus provides a means of transferring data to and from the latches and multiplexers on the IAC with peripheral devi ces in the IAC.

Pin 15 MREQ

A memory request line operates in conjunction with the Read/Write lines. These lines read from or write to the MPC processor memory.

Pins 16/17 UNUSED

Pin 18 SYNC IN

This is an input received from a connection to an external device.

Pins 19/51 ALARM 1 OUT +/ALARM 1 OUT -

This is an output to an external device to perfo rm a specific function.

Pins 20/52 ALARM 2 OUT +/ALARM 2 OUT -

Pins 7/39 ALARM 3 IN +/ALARM 3 IN -

This is an input received from a connection to an

external device as a specific condition.

Pins 8/40 ALARM 4 IN +/ALARM 4 IN -

This is an input received from a connection to an

external device as a specific alert condition.

Pin 9 SQUELCH ENABLE

This is an output to rear connector J1. It can be configured for inverted output, non-inverted output or logic controlled non-inverted output.

Pin 10 EXTERNAL REQ 2

This is an input received from a connection to an external device.

This is an output to an external device to perfo rm

a specific function.

Pins 21-23 UNUSED

Pins 24/25 +15V ACCESSORY

This DC supply is an output to an ext ernal device

through rear connector J1.

Pins 26/58 +15V FILTERED

This DC supply is an output to an ext ernal device

through rear connector J1.

Pins 27/59 -5V IN

This is the -5V input from the power supply via

the Controller backplane.

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CIRCUIT DESCRIPTION

Pins 28-29 +5V IN Pins 60-61

This is the +5V input to the MPC from the power

supply via the Controller backplane.

Pins 30/62 +15V IN

This is the +15V input to the MPC from the

power supply via the Controller backplane.

Pins 31-32 GROUND Pins 63-64

This is the ground connection to the MPC from

the power supply via the Controller backplane.

Pins 41-42 UNUSED

Pin 47 READ

Read is used with the MREQ line to read data

from the MPC processor and external memory.

6.11.6 P501 EXTERNAL OUTPUTS

Connector P501 contains data and cont rol output s to the terminal block on the back of the Repeater cabinet. These outputs are connected to other external devices.

The input and outp ut connec tors for the conn ector are defined as follows.

Pins 1/17 ALARM 3 OUT +/ALARM 3 OUT -

Pins 2/18 ALARM 4 OUT +/ALARM 4 OUT -

These are outputs to exter nal device s to perform a specific function.

Pin 3 RX WBAND

Receive Wide Band Audio from the Receiver audio demodulator through the RF Interface Board. The typical amplitude is 387 mV RMS (-6 dBm) and 2V DC with Standard TIA Test Modulation into the receiver.

Pins 4-6 UNUSED

Pin 48 WRITE

Write is used with the MREQ line to write data to

the MPC processor and external memory.

Pins 49-50 UNUSED

Pins 53-55 UNUSED

Pin 56 THERMAL SENSOR

The Therma l Sensor monitors the PA temperature and creates an alarm condition if the temperature exceeds the limit.

Pin 57 POWER SWITCH

Pin 57 turns the v olt ag e f rom t he power supply to the Repeater on and off. This pin is connected to the on/off toggle switch S508.

Pin 7 EXT OUT 1

This is an external output to rear connector J1.

Pin 8 RF CLOCK

The clock will control the synthesizer chips and power control circ uit when loa ding. This pin is a TTL input from the Controller.

Pin 9 AC FAIL IN

This input from the AC supply is used by the AC fail output to indicate that the AC has been interrupted.

Pin 10 SYN CS RX

This is the chip select pin for the main receiver synthesizer chip. This chip is the same part as used in the Exciter. A low loads the synthesizer.

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Pin 11 UNUSED

Pin 12 RF MUX 1 INH

The Multiplexer-1 Inhibit (U105, pin 6) is a CMOS input from the Controller that inhibits (disables) the Multiplexer-1 output with a logic high.

Pin 13 RF MUX 2 INH

The Multiplexer-2 Inhibit (U106, pin 6) is a CMOS input from the Controller that inhibits (disables) the Multiplexer-2 output with a logic high.

Pin 14 RF MUX 3 INH

The Multiplexer-3 Inhibit (U104, pin 6) is a CMOS input from the Controller that inhibits (disables) the output from the RF 3 Multiplexer with a logic high.

Pin 15 PC STR

The Power Control Strobe is normally low until after the po wer control data is shifted into the power control register. Then the strobe line goes high and back to low. The clock or data lines cannot be changed until after the strobe is set.

Pin 16 HS CS EX

This is the Exciter high stability synthesizer chip select. A low enables loading the high stability synthesizer loop. This pin is only used on high stability equipped units.

Pins 19-21 UNUSED

Pin 22 BUF RX WBAND

Pin 23 AC FAIL OUT

This is an indication tha t the AC power has been

interrupted.

Pin 24 UNUSED

Pin 25 HS CS RX

This is the receiver hig h stabil ity synt hesi zer ch ip select. A low enables loading the high stability synthesizer loop. This pin is only used on high stability equipped units.

Pin 26 SYN CS EX

Pin 26 is the exciter main Synt hesizer Chip Se lect that allows input of data to U403 when the line is pulled to logic low.

Pin 27 UNUSED

Pin 28 A D LEVEL

20 lines (of the possible 24) of RF functions sampled are multiplexed to the Controller through this pin using three multiplex chips.

Pin 29 RF DATA A

Data A (U105, pin 11) is the least significant bit (LSB) in the 3 multiplex chips located on the RFIB. This pin is a CMOS input from the Controller requiring a logic high for activation.

Pin 30 RF DATA B

Data B (U105, pin 10) is the middle significant bit in the 3 multiplex chips located on the RFIB. This pin is a CMOS input from the Controller requiring a logic high for activation.

This is buffered Receive Wide Band Audio from the receiver audio demodulator through the RF Interface Board. The typical amplitude is 387 mV RMS (6 dBm) and 5V DC with Standard TIA Test Modulation into the receiver. This is an output to t he rear connector J1.

August 2000 Part No. 001-2001-200

Pin 31 RF DATA C

Data C (U105, pin 9) is the most significant bit (MSB) in the 3 multiplex ch ips located on the RFIB. This pin is a CMOS input from the Controller requiring a logic high for activation.

6-42

CIRCUIT DESCRIPTION

Pin 32 RF DATA

This is a data pin with TTL levels from the Controller which has the dual role of loading the synthesizer chips and adjusting the power control D/A lines for proper output power. Up to four synthesizer chips and a shift-register could be connected to this pin.

6.11.7 J500 A D LEVEL TEST POINT

20 lines (of the possible 24) of RF functions sampled are multiplexed to the Controller through this pin using three multiplex chips.

6.11.8 J501 GROUND

J501 is an IAC ground reference for test points.

6.11.9 J502 +15V

J502 is a voltage test point.

6.11.10 POWER SWITCH

S508 turns the power supply DC voltage on and

off from the front of the IAC.

6.11.11 J505 SQUELCH ENABLE OUTPUT

P505 jumpers J505, pins 1/2 to configure the squelch enable output for an inverted output. P505 jumpers J505, pins 2/3 t o co nfi gur e t he squelch enable output for a non-inverted output. P505 jumpers J505, pins 3/4 to configure the squelch enable output for a non-inverted output under the control of U503.

6-43

August 2000

Part No. 001-2001-200

CIRCUIT DESCRIPTION

August 2000 Part No. 001-2001-200

6-44

A0-A19

LPTT

IRDB-

RIDB+

SWITCH TxD

SWITCH RxD

READ

WRITE

MREQ

DS1

+5V

U6B

READ

WRITE

LED DRIVER

U15

DISPLAY DRIVER

U26

BALANCED Rx/Tx

U24

U20CU6A

ADDRESS BUS (19:0)

MAIN MICROPROCESSOR

PO0 PO1 PO2 PO3 PO4 PO5

A B C D

D R

DMARQ0 DMAAKO TC0 DMARQ1

INT POLL TxD1 RxD1

TxD0 RxD0

R/W

MREQ

PT2

A0-A19

READY

U27

RESET

READY

INTP0 INTP1 MSTB

T OUT

D0-D7

PT1

PT0

PO6

T OUT

U30A/U31A

Y1 10 MHz

Q2/Q3

U11

RST1

U17

RES IN

RST2

FLASH

EPROM

+5V

RESET

FLASH MEMORY

A0-A16

U25

Vpp

OE WE Vpp CE

DQ0-DQ7

DATA BUS (7:0)

A16

A17

A18

A19

U20B U20A

A13

A14

A15

A0-A14

D0-D7

D O14

O15

EPROM

U18

O13

G2B

O11

RAM

A0-A12

D0-D7

U28

DE WE

READ

WRITE

MSTB

UART

RxRDY TxE

D0-D7 D0-D7

MODEM DCD 4

COMPUTER Tx 2

COMPUTER Rx 3

U16F

U16D

U16C

MPC

U21

RESET

PROGRAMMING PORT

BAUD RATE

9600 4800 2400 1200

2 4 6 8 10 12 14

76800 38400 19200

1 3 5 7

9 11 13

RxD

TxD

CLOCK

TxC

RxC

U32B

Y0-Y3

U31

U32A

Y0-Y3

U30

RD WR

U22

U2F

RST

U20D U6C

TX FIFO

MR DIR S1

DOR SO

RST P1-1 P3-7 P3-6

D0-D7

U13

A8-A15

HSDB -

HSDB +

U2F/U31B

U23

U16B

P1-3

P3-1

P3-0

HIGH-SPEED DATA BUS

MICROPROCESSOR

PROCESSOR TO PROCESSOR COMMUNICATION FIFOs

A0-A7D0-D7

ADDRESS BUS (7:0)

U2B U6D

ADDRESS

SELECT

P1-0

P1-2

PSEN

ALE

A13

A14

A15

ADDRESS/DATA BUS (8:15)

Y1Y2

CY0

A0-A7

*U1CS1

DOR SO

A0-A7

MR DIR

U7B U2A

A8-A12

D0-D7

U2C U7A

U10

EEPROMRAM

A8-A13

D0-D7

A0-A7

U14

ADDRESS BUS (7:0)

LOWER

ADDRESS LATCH

A0-A7 D0-D7

CEN

6-45

August 2000

Part No. 001-2001-200

MAIN PROCESSOR CARD BLOCK DIAGRAM

FIGURE 6-17

FOLDOUT

A0-A19

MREQ 15

MSTB 16

D0-D7

VOTER DATA IN 58

+15V 30

+15V 62

P101

Z102

A16-A19

TX FIFO

D0-D7

ADDRESS LATCHES

A-D

U103

D1 G1

U101E

DIR

U161

DOR

A0-A7

+9V REG

U136

A12-A15

A-D

U154B

U101C U154D

U162D

U17-1

RESET

U133

U119

TX FIFO

RX FIFO

MPC LATCH

P100

EXT REQ

LOCAL MIC PTT

Q102

U105

AUDIO/DATA

MICROPROCESSOR

P3-7 P1-3

U111

P1-1P1-1

D0-D7

P3-0

RST

D0-D7

P3-6

P1-0

P1-2

A8-A15

ALE

PSEN

P1-6

P1-7

P3-2

P3-3

P3-4 U117B-8 TX DATA EN

A13

A14

A15

U159B-8 LOGIC SQUELCH

U125D-14 RX DATA

U126A-3 TX DATA

U126A-3 TX SHAPE

DATA BUS (7:0)

U102

ADDRESS SELECT

ACCRESS BUS (15:8)

ADDRESS/DATA BUS (7:0)

U154A

RX FIFO

U119 U101D

LOWER ADDRESS LATCH

Q0-Q7

A0-A7

U104

C EN

DOR

U160

A0-A7 D0-D7

DIR

U101F

D0-D7

A8-A14

EPROM

U112

A0-A7

GATE LATCHES

D1-D8

CLK

D1-D8

CLK

D1-D8

CLK

D1-D8

CLK

D1-D8

CLK

U108

U107

U106

U156

U155

U115A VOTER AUDIO MUTE

U114D LOCAL AUDIO MUTE

U113C RX MUTE

U114A RX OPTION

U115B RX VOICE

U116B RX AUDIO

U115C RX VOICE TO BACKPLANE

U116A FSK TO AUDIO

U153C REPEAT

U153D TxS TO FSK

U116D TxA TO FSK

U159C DATA TO A D

U116C Tx AUDIO

U158A Tx VOICE

U153A DATA LEVEL TEST

U100B CWID CONTROL

U159A LEVEL DETECT

U158C Tx OPTION

U117C LOCAL MIC MUTE

U118C EXTERNAL MOD MUTE

U118B NORMAL MOD MUTE

U118D Tx MOD MUTE

U151-U149 INC

U151-U149 U/D

CS0

CS1

CS2

CS3

WO 125

CS5

CS6

WO 126

U153B Tx NET

U115D Rx NET

CS10

CS11

U149 CS12

WO 127

U151 CS14

CS15

August 2000 Part No. 001-2001-200

U117A Tx INTERCOM

U157

D1-D8

CLK

U113D Rx SQ ACTIVE

U159B LOGIC SQ A D

U159D Tx MOD A D

U113B NORMAL Rx

WO 118

WO 117

WO 116

MAIN AUDIO CARD LOGIC BLOCK DIAGRAM

FIGURE 6-18

6-46

Rx VOICE

GATE

U114D

LOCAL AUDIO

OUTPUT AMPLIFIER

U132

J104

EXTERNAL SPEAKER

VOTER AUDIO 25

Rx WB AUDIO 27

TxS - 4

SECONDARY AUDIO

FROM SWITCH

TxS + 3

P100

LOW-PASS FILTER

U163B

HIGH-PASS FILTER

> 30 kHz

U135A

Rx DATA

FILTER

U124A/B

VOTER AUDIO

AMPLIFIER

U120A

< 3 kHz

U121A/B

AMPLIFIER

U135B

Rx DATA

AMPLIFIER

U125A

U131C

NOISE

VOTER AUDIO

U115A

Rx AUDIO

AMPLIFIER

U122A

+1.25V

U123A U123B

Tx AUDIO

AMPLIFIER

U131D

MUTE

U108

RESTORATION

U125B/C

HIGH-PASS FILTER

U122B/C/D

NOISE

RECTIFIER

U125D

TxS TO FSK

GATE

U153D

U107

> 300 Hz

DATA LEVEL

TEST GATE

U153A

SCHMITT TRIGGER

U123C

U111 Rx DATA

DE-EMPHASIS

U163A

TIMING BUFFER

U123D

LOGIC SQ A-D

U159B

GATE

U157

NORMAL RX

GATE

U113B

U113D

Rx ACTIVE

GATE

DA TA TO A-D

GATE

U159C

U107

RX MUTE

GATE

U113C

U108

RX OPTION

U114A

U114B

RX OPTION

A301

COMPANDING

OPTION

GATE

U108

U114C

U108

Rx VOICE

GATE

VOICE

AMPLIFIER

U115B U120B

U108

REPEAT

GATE

Rx NET

GATE

U115D

U153C

U155

U107

RX AUDIO

GATE

U116B

U108

Rx VOICE

TO BACKPLANE

U115C

FSK AMPLIFIER

U165B

FSK TO AUDIO

GATE

U116B

U108

GATE

U108

MAIN AUDIO

AMPLIFIER

U166A

SECONDARY

AUDIO AMPLIFIER

U131A

FSK AMPLIFIER

U165A

TxD

Tx OUT TxD

U109

RxD

U110

Rx IN

BUFFER

U166B

BUFFER

U131B

U162C

U162B

J101

P101

23 SWITCH Tx DATA

22 SWITCH Rx DATA

SPEAKER/MIC

RS-232

P100

31 Rx VOICE

14 Rx AUDIO -

13 Rx AUDIO +

2 RxS -

1 RxS +

MAIN AUDIO TO SWITCH

SECONDARY AUDIO TO SWITCH

TxA + 15

MAIN AUDIO

FROM SWITCH

TxA - 16

Tx VOICE 32

Tx AUDIO

AMPLIFIER

U167A

HIGH PASS FITLER

U167B/C

Tx VOICE

AMPLIFIER

U130A

U167D

TxA TO FSK

Tx VOICE

AMPLIFIER

U130B

Tx VOICE

GATE

U158A

U107

GATE

U116D

U107

Tx AUDIO

GATE

U116C

U107

Tx NET

GATE

U153B

U155

LOCAL MIC PTT

J102

Tx OPTION

LOCAL MIC MUTE

U164A

Q101 Q102

Tx OPTION

GATE

U158C

U158D

U158B

Tx OPTION

GATE

Tx INTERCOM

GATE

U117A

U157

GATE

U117C

U106

Tx AUDIO

BUFFER

U164B

U105 LOCAL MIC PTT

LEVEL DETECT

GATE

U159A

U106

HIGH-PASS FILTER

> 300 Hz

U127B/C

LIMITER

U127D

Tx MOD A D

GATE

U159D

U157

SPLATTER FILTER

LPF

U127A

BUFFERS

U128B/C

Tx SHAPE U111

Tx DATA U111

LPF

U128D/A

U126A

U106 INC

U106 U/D

NORMAL MOD MUTE

GATE

U118B

U106

U106 INC

U106 U/D

Tx DATA ENABLE

GATE

U117B

U111

Tx AUDIO AMPLIFIER

U149

U129C

Tx DATA AMPLIFIER

U151

U126B

U155 CS12

U155 CS14

Tx DATA FILTER

U126C

CWID TONE

GENERATOR

CWID FILTER

U100B/A U129A

U126D

P106

P107

J106

SUMMING

AMPLIFIER

U129B

J100

A-D LEVEL TEST POINT

Tx MOD MUTE

GATE

U118D

U106

EXTERNAL MOD MUTE

GATE

U118C

U106

28 A-D LEVEL

8 TxD OUT

9 TxD IN

29 Tx MOD

6-47

August 2000

Part No. 001-2001-200

MAIN AUDIO CARD AUDIO BLOCK DIAGRAM

FIGURE 6-19

FOLDOUT

DO-D7

A13-A19

THERMAL

SENSOR

READ

WRITE

P500

ALARM 2 OUT

ALARM 1 OUT

DATA BUS (7:0)

IAC ADDRESSING LED CONTROL

A16 A17 A18 A19

A13 A14 A15

A B

U501

C D

A B C G2MREQ

U500

U506

K501 K500

O3 O2 O5 O7 O4 O1

INTR

D0-D7

V IN+

Q501 Q500

D0-D7

CLK

U518

Q4 Q7

RSSI O

U519

IFA IN

CLK

D1-D8

U503

Q0 Q1 Q2 Q3 Q4 Q6

ANALOG LEVEL DETECTOR

Q5 Q6

+5V

U508

U507D

J500

U509A U509B U507B

U509C U507C

MISC INPUTS

Q1-Q8

U517

D3 D2 D8

U507A

Q502 Q503

RF INTERFACE

U505

CLK

U504

Q2 Q3 Q4 Q5 Q6 Q7 Q8

Q1 Q2 Q3 Q4 Q5 Q6 Q7

D0-D7

U508E

K502 K503

U514BU514A

P501

RF MUX 1 INH RF MUX 2 INH RF MUX 3 INH PC STR HS CS EX STN CS EX HS CS RX STN CS RX

WO 1 AC FAIL IN

RF DATA A RF DATA B RF DATA C RF DATA RF CLK AC FAIL OUT WO 2

EXT REQ 1

A D LEVEL

ALARM 3 OUT

ALARM 4 OUT

BUF RX WBAND

RX WBAND

U521

Q1-Q8

INVERTED

NON-INVERTED U503 CONTROL

NON-INVERTED

D1 D2

D3 D4

J505

ALARM INPUTS

U520

U510

U513C

U511

U513B

U512

Q505

Q504

CR507 CR506

CR509 CR508

CR511 CR510

CR513 CR512

S500

S501

S502

S503

+5V

+15V

P500

ALARM 1 IN

ALARM 2 IN

EXT REQ 2

J503

ALARM 3 IN

J504

ALARM 4 IN

SQUELCH EN

August 2000 Part No. 001-2001-200

INTERFACE ALARM CARD BLOCK DIAGRAM

FIGURE 6-20

6-48

ALIGNMENT AND TEST PROCEDURES

SECTION 7 ALIGNMENT AND TEST PROCEDURES

7.1 RECEIVER ALIGNMENT

R I T I C A L A D J U S T M E N T

The TCXO must be adjusted within 5 minutes of turning the AC power on to the repeater. Do not under any circumstances try to set frequency later on in any of the tests, as TCXO frequency stability cannot then be guaranteed.

Refer to Figure 7-1 for component locations. Refer to Figure 7-6 for equipment needed and setup diagram. Select "RECEIVER" from the "TEST" menu in the Repeater Software.

7.1.1 PRETEST

Preset L102, L103, L104, L108, L109, L110, L140 and L141 tuning screws about 1/4 inch above the top of the casting.

For 12.5 kHz operation, place jumper plugs P203, P204 and P205 across pins 2-3 of J203, J204 and J205.

For 25 kHz operation, place jumper plugs P203, P204 and P205 across pins 1-2 of J203, J204 and J205.

7.1.2 VOLTAGE MEASUREMENTS

Apply power to the Receiver by plugging the 20pin cable from the RF Interface Board into J201 (see Figure 7-1

Measure the voltages at the following pins. U301, pin 3 +6V DC ±0.3V

U302, pin 3 +12V DC ±0.4V U303, pin 3 +12V DC ±0.4V U304, pin 3 +12V DC ±0.4V R402/R403 junction +3.5V DC ±0.1V

1. Using the PC and software, program the Synthesizer for the Receive frequency.

2. Tune the VCO capacito r L102 f or +7V DC ±0.05V at TP401. Increase the receive frequency by 1 MHz. The voltage on TP401 shall be less than 15V. Decrease the receive frequency by 1 MHz. The voltage on TP401 shall be greater than 2.5V.

3. Alternately tune CV151 and CV152 in 1/2-turn to 1-turn increments until a voltage is measured at TP401. At that time, tune CV151 for a peak, then CV152 for a peak.

4. Retune CV151/CV152 for a peak at TP401.

For Receivers ope rating within 2 MHz of the top of the receive band (148-150 or 176-178 MHz).

1. Program the Synthesizer for the Highest receive frequency (i.e. 150 or 178 MHz).

2. Set the control line voltage for 15V at TP401. Check 2 MHz below the programmed frequency (i.e. 148 or 176 MHz) to verify that the control voltage at TP401 is greater than 2V. The repeater receiver can now be programmed for the desired operating frequency.

For Receivers operating wit hin 2 MHz of the bottom of the receive band (132-134 or 150-152 MHz).

1. Program the Synthesiz er f or the Lowest receive frequency (i.e. 132 or 150 MHz).

2. Set the control line voltage for 2V at TP401. Check 2 MHz above the programmed frequency (i.e. 134 or 176 MHz) to verify that the control voltage at TP401 is less than 15V . The repeater receiver can now be programmed for the desired operating frequency.

7.1.3 PROGRAM TUNE-UP CHANNEL

For Receivers operating between: 132-150 MHz, 150-178 MHz.

NOTE: The Channel Frequency and Synthesizer Frequency appear at the bottom of the screen.

August 2000

7-1

Part No. 001-2001-200

ALIGNMENT AND TEST PROCEDURES

J201

2 1

J205

J204

U302

RV211

RV201

RV213

RV203

U202

RV202

Z216

Z214

U203

Z204

U201

L206

CV212

L204

Z202B

Z202A

Z212B

Z206

Z212A

Z205

Q211

Q201

20 19

U304

U204

RV212

Z215

U102

L216

CV212

L214

L213

CV211

Z211AZ211B

Z201A

Z201B

CV201

L203

Q204

Y201

FL201

CV152

L141

U101

L211

J203

L201

CV151

L140

CV106

L110

TP102

CV105

L109

FL102

U301

Q406

Q408

Q407

Q401

Q404

Q402

U303

Q134

CV104

L108

Q403

U401

Q405

Q410

Q133

Q101

Q102

TP401

Q409

Q411

Q132

Q131

CV103

L104

CV102

FL101

CV101

L103

L102

A201

Figure 7-1 RECEIVER ALIGNMENT POINTS

7.1.4 RECEIVER FREQUENCY ADJUST

1. Place a pick-up loop (sniffer) or RF probe connected to a frequency counter near TP102.

2. Set Y401 (TCXO) for the Injection Frequency ±50 Hz (Inj Freq = chnl freq + 52.95 MHz).

7.1.5 VCO TEST

1. The software programs the synthesizer for 1 MHz above the receive channel.

2. The voltage on TP401 should be < 10V.

3. Record the voltage on TP401 __________.

4. The software programs the synthesizer for 1 MHz below the receive channel.

5. The voltage on TP401 should be > 4V.

8. The software programs the synthesizer for the receive frequency.

7.1.6 FRONT END ADJUSTMENTS

NOTE: Verify that the appropriate IF jumpe rs (J203, J204, J205) are selected.

1. Set the signal generator to the receive frequency at a level sufficient to produce an output voltage at TP201 or J201, pin 7 (RSSI Output).

2. Tune CV101, CV102, CV1 03, CV104, CV105, and CV106, then repeat, for a peak voltage at TP201. Decrease the generator output level to maintain a 2-3V reading at TP201.

FOR 12.5 kHz CHANNELS:

NOTE: Perform this test if CV211 and CV212 are placed on the board.

6. Record the voltage on TP401 __________.

7. If the voltages recorded in Steps 3 and 6 are not

within ±0.2V, tune L102 as required to balance the voltage readings.

August 2000 Part No. 001-2001-200

1. Set the generator to an RF level sufficient to produce 2V DC at TP201.

2. Remove any modulation from the signal generator.

7-2

EF Johnson 2422001 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SECTION 1 INTRODUCTION AND OPERATION

1.1 SCOPE OF MANUAL

1.2 REPEATER DESCRIPTION

1.4 MODEL NUMBER BREAKDOWN

Figure 1-2 PART NUMBER BREAKDOWN

1.5 ACCESSORIES

1.3 REPEATER IDENTIFICATION

Figure 1-1 REPEATER IDENTIFICATION

Table 1-1 REPEATER ACCESSORIES

1.7 FACTORY CUSTOMER SERVICE

1.6 PRODUCT WARRANTY

1.8 FACTORY RETURNS

1.10 SOFTW ARE UPDATES/REVISIONS

1.1 1 REPEATER OPERATION

1.11.1 MAIN PROCESSOR CARD (MPC)

1.9 REPLACEMENT P ARTS

Figure 1-3 REPEATER CARDS

Table 1-2 ACTIVE REPEATER ALARMS

1.11.2 MAIN AUDIO CARD (MAC)

1.11.3 INTERFACE ALARM CARD (IAC)

1.11.4 POWER SUPPLY

1.12 REPEATER INFORMATION

1.12.1 INTRODUCTION

1.12.4 MOBILE TRANSCEIVERS

1.13 REPEATER DATA BUS SIGNALING

1.13.1 GENERAL

1.12.2 HOME REPEATERS

1.13.2 MOBILE DATA MESSAGE ORDER

1.13.3 ID VALIDATOR OPERATION

SECTION 2 INST ALLATION

2.1 INTRODUCTION

2.2 ENVIRONMENT

2.3 VENTILATION

2.4 AC POWER

Figure 2-1 BATTERY BACKUP CONNECTOR

2.5 BATTERY BACKUP

Figure 2-2 TEMPERATURE SENSOR CABLE

2.6 800W POWER SUPPLY

Figure 2-3 POWER CABLE CONNECTOR AND SCHEMATIC

Table 2-1 OUTPUT VOLTAGES

Table 2-2 OVER VOLTAGE

2.6.1 AC INPUT REQUIREMENTS

2.7 GROUNDING

2.7.1 PROTECTION GUIDELINES

2.8 UNPACKING AND INSPECTION

Figure 2-4 RACK MOUNTED REPEATERS

Figure 2-5 5-CHANNEL COMBINING SYSTEM

2.9 REPEATER DATA BUS INSTALLATION

2.9.1 MPC DA TA BUS SWITCH SETTINGS

2.9.2 MPC DATA BUS JUMPER SETTINGS

Figure 2-6 RJ-11 TO BNC MPC JUMPERS

Figure 2-8 ANTENNA CONNECTIONS

Figure 2-7 RJ-11 TO RJ-11 MPC JUMPERS

Figure 2-10 SINGLE REPEATER INSTALLATION

Figure 2-11 TWO REPEATER INSTALLATION

Figure 2-12 THREE OR MORE REPEATERS INSTALLATION

Figure 2-13 MIXED VIKING VX AND CR1100 REPEATER INSTALLATION

SECTION 3 SOFTWARE

3.1 INTRODUCTION

3.1.1 HOW TO USE THIS MANUAL

3.1.2 GETTING STARTED

3.1.3 COMPUTER DESCRIPTION

1. One 3.5" high density disk drive.

2. 640K of memory

3. MS-DOS version 2.0 or higher

4. One serial port

5. Monochrome or color monitor and video card

3.1.4 EEPROM DATA STORAGE

3.1.5 COMMAND LINE OPTIONS

2. Select COM port from Utilities heading.

3.1.6 COLOR OR MONOCHROME OPERA TION

3.2 REPEATER PROGR AM SOFTWARE

3.2.1 INSTALLING THE SOFTWARE

3.2.2 MINIMUM FREE MEMORY REQUIRED

3.3 REPEATER PROGR AMMER

3.3.1 PROGRAM FILES