Glenayre GL-T8200 User Manual

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99

any means—graphic, electronic, or mechanical, including photocopying, recording, taping, or information-retrieval system—without written permission of Glenayre.

GL-T8200 1- to 25-Watt, 900-MHz Power Amplifier

USER MANUAL PN 9110.01306 REV A

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 Document Change Record Rev. A: 03/23/99

Document Change Record

Revision: Revision A Date: 03/23/99 Changes: none, original

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 Table of Contents

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Table of Contents

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

1.1 Manual Scope . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1.2 Applicable Documents. . . . . . . . . . . . . . . . . . . . . 1-1

1.3 Manual Sections . . . . . . . . . . . . . . . . . . . . . . . 1-1

2 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1

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

3.1 Physical Description. . . . . . . . . . . . . . . . . . . . . . 3-1

3.1.1 Mounting Provisions . . . . . . . . . . . . . . . . . . . . . . . .3-1

3.1.2 PA Chassis Rear Connector Panel . . . . . . . . . . . . . . . . .3-1

3.2 Functional Description. . . . . . . . . . . . . . . . . . . . . 3-3

3.2.1 RF Path . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-3

3.2.2 Signal and Power Connections . . . . . . . . . . . . . . . . . . .3-3

3.2.3 Isolator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-4

4 INSTALLATION AND SETUP . . . . . . . . . . . . . . . . . . . . . . . . . 4-1

4.1 Cabinet Installation and External Cabling . . . . . . . . . . . . . 4-1

4.1.1 Tools and Equipment Required. . . . . . . . . . . . . . . . . . .4-1

4.1.2 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4.1.3 Rack Positioning . . . . . . . . . . . . . . . . . . . . . . . . . .4-1

4.1.4 External Cabinet Equipment Cabling. . . . . . . . . . . . . . . .4-1

4.1.5 PA I/O Connections. . . . . . . . . . . . . . . . . . . . . . . . .4-2

4.2 Setup. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3

4.2.1 Expected Exciter . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

4.2.2 Setup Using VDT . . . . . . . . . . . . . . . . . . . . . . . . . .4-3

5 OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.1 Controls and Indicators . . . . . . . . . . . . . . . . . . . . 5-1

5.2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1

5.2.1 Turn PA On and Off . . . . . . . . . . . . . . . . . . . . . . . .5-1

5.2.2 Turn Fan On and Off . . . . . . . . . . . . . . . . . . . . . . . .5-1

5.2.3 Key and Unkey PA . . . . . . . . . . . . . . . . . . . . . . . . .5-1

6 THEORY OF OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1 Power Distribution . . . . . . . . . . . . . . . . . . . . . . 6-1

6.1.1 Fan Power. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1

6.1.2 High-Current Power to PA Board. . . . . . . . . . . . . . . . . .6-1

6.1.3 Metering Circuit Regulators . . . . . . . . . . . . . . . . . . . .6-1

6.2 RF Flow . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 Table of Contents Rev. A: 03/23/99

6.3 PA Board . . . . . . . . . . . . . . . . . . . . . . . . . 6-2

6.3.1 Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . .6-3

6.3.2 Internally Generated Voltages . . . . . . . . . . . . . . . . . . 6-3

6.4 Exciter Interface . . . . . . . . . . . . . . . . . . . . . . . 6-5

6.4.1 Exciter Interface Connector Pinout. . . . . . . . . . . . . . . . . 6-5

6.5 Analog Readings Thresholds . . . . . . . . . . . . . . . . . . 6-5

6.5.1 PA Board Currents . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

6.5.2 PA Forward Power . . . . . . . . . . . . . . . . . . . . . . . . . 6-6

6.5.3 PA Reflected Power . . . . . . . . . . . . . . . . . . . . . . . . 6-6

6.5.4 PA Board RF Input Power . . . . . . . . . . . . . . . . . . . . . 6-6

6.5.5 +28-Volt External Supply . . . . . . . . . . . . . . . . . . . . .6-6

6.5.6 +36-Volt Internal Supply . . . . . . . . . . . . . . . . . . . . . . 6-6

6.5.7 +5-Volt Internal Supplies. . . . . . . . . . . . . . . . . . . . . . 6-7

6.5.8 Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-7

7 MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.1 Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 7-1

7.2 Power Calibration . . . . . . . . . . . . . . . . . . . . . . 7-1

8 CHECKOUT AND TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 8-1

8.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . 8-1

8.2 Checkout Procedures . . . . . . . . . . . . . . . . . . . . . 8-1

8.2.1 VDT Power-Up Verification . . . . . . . . . . . . . . . . . . . . 8-1

8.2.2 Dc Voltage Verification . . . . . . . . . . . . . . . . . . . . . . 8-1

8.3 Troubleshooting Procedures . . . . . . . . . . . . . . . . . . 8-1

8.3.1 Parameter Readings at Time of Fault. . . . . . . . . . . . . . . . 8-1

8.3.2 GL-C2000 Transmitter Controller Alarms . . . . . . . . . . . . . 8-2

8.3.3 Operational Checks. . . . . . . . . . . . . . . . . . . . . . . . . 8-2

8.3.4 Power Amplifier Current Measurement . . . . . . . . . . . . . . 8-2

9 REMOVAL AND REINSTALLATION . . . . . . . . . . . . . . . . . . . . 9-1

9.1 PA . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

9.1.1 Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9-1

9.1.2 Reinstallation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9-1

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 List of Figures

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List of Figures

Figure 3-1 PA Front Isometric View . . . . . . . . . . . . . . . . . . . . . . . . . 3-2

Figure 3-2 Top View of PA RF Compartments, Showing Internal Assemblies . . . 3-3

Figure 4-1 PA Rear View. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4

Figure 6-1 Simplified Power Amplifier Block Diagram . . . . . . . . . . . . . . . 6-2

Figure 6-2 PA Board Functional Diagram . . . . . . . . . . . . . . . . . . . . . . 6-4

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 List of Figures Rev. A: 03/23/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 List of Tables

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List of Tables

Table 1-1 Applicable Documents . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

Table 1-2 Manual Sections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2

Table 2-1 Power Amplifier Specifications. . . . . . . . . . . . . . . . . . . . . . 2-1

Table 4-1 Required Tools and Equipment. . . . . . . . . . . . . . . . . . . . . . 4-1

Table 4-2 PA I/O Connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2

Table 4-3 Exciter/PA Connector Pinout (For DSP Exciter). . . . . . . . . . . . . 4-3

Table 4-4 PA Board Fuses. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5

Table 6-1 PA Board Voltages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-1

Table 6-2 Metered Parameter Thresholds . . . . . . . . . . . . . . . . . . . . . . 6-7

Table 8-1 PA Board Current. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8-2

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 List of Tables Rev. A: 03/23/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 GENERAL

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GENERAL

1.1 Manual Scope

This manual provides information for th e 1 to 25-watt, 900-MHz power amplifier, part number 1000.02186.

1.2 Applicable Documents

This manual is incomplete without additional manuals. Refer to Table 1-1 for a listing and function of these manuals.

1.3 Manual Sections

Table 1-2 lists the sections of this manual with a summary of their contents.

Table 1-1 Appl icable Documents

document part number function

GL-T8200 system manual 9110.01305 describes fully racked-up GL-

T8200 transmitter

DSP VDT manual 9110.00259 describes DSP excit er software in-

stalled in exciter

DSP exciter user manual 9110.01021 describes DSP exciter hardware

equipment in transmitter

GL-T8200 1 to 25-watt PA manual

9110.01306 this manual

power supply manual 9110.00622 describes GL2728 power supply

equipment

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 GENERAL Rev. A: 03/23/99

Table 1-2 Manual Sections

section contents

1. General introduction and purpose of manual

2. Specifications significant measurements of power amplifier

3. Description introduction and principal characteristics of power amplifier

4. Installation and Setup initial installation and activation of po wer amplifier

5. Operation operation of power amplifier

6. Theory of Operation detailed functional description of circuitry within power amplifier

7. Maintenance procedures to be performed on specific intervals to maintain optimum performance of power amplifier

8. Checkout and Troubleshooting verification of p roper operati on, correct ion to p roper operation of power amplifier

9. Removal and Reinstallation removal and reinstallation procedures for the PA

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 SPECIFICATIONS

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2 SPECIFICATIONS

Table 2-1 lists the significant equipment-level specifications for the power amp lifier.

Table 2-1 Power Amplifier Specifications

measurement condition specification

Electrical

RF output power (W) continuous, at

output of PA

1 to 25

RF bandwidth (MHz) exceeds exciter bandwidth RF input power (mW) factory-set

attenuation

200-400

RF input connector type-N female RF output connector output of PA type-N female input and output RF

impedance (ohms)

VSWR max 1.5 dc input power

voltage (Vdc) current, idle/operating (A)

Mechanical and Environmental

humidity 5 to 95%, noncondensing ambient storage temperature -30

to 70oC

ambient operating temperature

-30

to 60oC

temperature derating factor above 5000 feet (1500 m)

0.5

C per 100 m

vibration Mil-Std 810E, Method 514.4

Category 1

maximum operating elevation

to 10,000 ft (3050 m)

height 3 RU (5.25 in, 13.4 cm) width 19 in (48 cm) depth 12 in (30.5 cm) weight 25 lb (11.3 kg)

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 SPECIFICATIONS Rev. A: 03/23/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 DESCRIPTION

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3 DESCRIPTION

This is a 1- to 25-wa tt PA intended for use on th e 900 -MHz band. This PA is characterized by integrated monitoring devices that supply critical status information to the DSP exciter. This exciter contains diagnostic software that can detect and report a faulty PA.

3.1 Physical Description

Refer to Figure 3-1 and Figure 3-2. The PA consis ts of a 3 RU high chassis, including convection fins and one fan.

The chassis contains a PA board which contains metering circuitry, power distribution circuitry, and RF amplification circuitry.

3.1.1 Mounting Provisions

The P A i s mounted to the front of most standard 19-inch equipm ent racks by m eans of eight screws. The front panel o f the PA may by removed while the PA is mounted in the rack for access to fuses. Thumbscrews secure the front panel to the PA.

3.1.2 PA Chassis Rear Connector Panel

Refer to Figure 4-2 for a list of connections for th e P A . The PA chassis rear connector panel has an RF input connector , an RF output co nnector , a dc power inpu t connector, a dc power output connector, a fan, and a 15-pin connector for connection to the DSP exciter.

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 DESCRIPTION Rev. A: 03/23/99

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Figure 3-1 PA Front Isometric View

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 DESCRIPTION

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Figure 3-2 Top View of PA Board, Showing I/O

3.2 Functional Description

The RF amplifier circuitry of the power amplifier is contained within the PA chassis. The monitoring of the RF amplifier system is accomplished by the digital exciter through the PA board located in the PA chassis.

3.2.1 RF Path

The PA chassis receives the exciter output at a rear-mounted type-N connector on the PA board. The RF output power leaves the PA board through a type-N RF output connector . A jumper delivers the signal to the lightning protector output on the cabinet.

3.2.2 Signal and Power Connections

All PA dc, signal monitoring, and control signals are routed through the PA board.

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 DESCRIPTION Rev. A: 03/23/99

3.2.3 Isolator

intermodulation prevention An isolator receives the RF output of the PA chassis. It prevents intermodulation of th e RF

signal that may occ ur from nearby transmissi ons and red uces radiated ha rmonics. A sampl e detector circuit in the isolator reject load input monitors the reflected power (VSWR)

present at the cabinet’ s RF output connector . The VSWR RF sample is rectified an d filtered, providing a dc voltage proportional to the VSWR connector on the third isolator, w hich voltage is supplied to the DSP exciter for transmitter control and monitoring. The VSWRdetection circuit of the third isolator is the only means of detecting whet her there is an antenna fault, which can then be detected and reported.

reject load The triple isolator provides the power amplifier module with a stable 50-ohm load. This is

accomplished by directing any reflections from the output line to a reject load. Hence, the load presented to the PA final transistor is always acceptable.

power control An RF sample of the f orward output signal is obtained from the for ward-power coupler and

directed to the exciter, along with the reflected-power indication from the reflected-power coupler. Control circuits within the DSP exciter evaluate the forward power and the reflected power and control the output power according to conditions. Additionally, if the DSP exciter detects an RF fault, it passes the report to the GL-C2000 and VDT for system control.

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 INSTALLATION AND SETUP

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4 INSTALLATION AND SETUP

4.1 Cabinet Installation and External Cabling

4.1.1 Tools and Equipment Required

Refer to Table 4-1. Equipment listed by brand name may be substituted with equivalent. For installation, only common hand tools are necessary if at all, since equipment integration is usually completed at the factory.

4.1.2 Inspection

Refer to the system manual.

4.1.3 Rack Positioning

Refer to the system manual also. Rackup variation s are generall y not pos sible. Co oling and cabling restraints require that equipment pieces remain racked according to standard configurations.

4.1.4 External Cabinet Equipment Cabling

The equipment items that comprise the paging transmitter are usually contained in one cabinet. This section describes the various input and output connection s required to bring power and signals into and out of the cabinet.

Table 4-1 Required Tools and Equipment

nut driver - 5/16 in (7.9 mm) screwdriver - #2 flat blade and #3 flat blade screwdriver - #2 Phillips and #3 Phillips Bird 4421 RF power meter Bird 8327 dummy load spectrum analyzer barrel connector - type-N female cable - 1 M long (max) with 7/16 Din to type-N male ends Fluke 77 DVM 7/16 DIN male-to-type-N female adapter

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 INSTALLATION AND SETUP Rev. A: 03/23/99

4.1.5 PA I/O Connections

Refer to Figure 4-1 and the appropriate rear views in the transmitter system manual. Most connections are made to the rear of the PA chassis. Table 4-2 lists PA connections.

4.1.5.1 RF Output

Connect the antenna network to the lightning protector output. T he connector is typically a 7/16-inch DIN mounted on top of the transmitter cabinet. It should be securely tightened to a torque specification of 250 inch-pounds (2900 g-m).

4.1.5.2 The RF Output Forward and Reflected Dc Samples

The RF output forward and reflected dc sample from the isolator are digitized and routed to the DSP exciter. High reflected power from either the antenna network or the output of the PA causes reduced output and eventual shutdown.

4.1.5.3 Signal and Dc Connections

Be certain that the connection between the exciter and the rear of the PA chassis is secure. Wiring details of the exciter/PA connector are shown in Table 4-3.

Table 4-2 PA I/O Connections

connector name function note

RF input 200 mW type-N female RF out 25 W type-N female TO EXCITER J6 control See Table 4-3. +TB1-1 positive 28-Vdc

input

Anderson power pole (+) red

GROUND TB1-2 power supply

negative return

Anderson po wer pole (-) black

auxiliary dc outputs auxiliary power See Table 4-4. fan supplies voltage to

PA fan

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 INSTALLATION AND SETUP

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4.2 Setup

4.2.1 Expected Exciter

The PA chassis is interfaced to the exciter. The connection is:

• J6 to J6 for the DSP exciter.

4.2.2 Setup Using VDT

Setup of the PA is performed at the system level using a VDT. Refer to the VDT manual and screens, which include instructions for these applicable setup procedures:

• adjust forw ard power

• set low-power alarm

Figure 3-2 shows controls, test points, and fuses on the PA board.

Table 4-3 Exciter/PA Connector Pinout (For DSP Exciter)

PA J6-x description direction

1 analog 1 to exciter 9 analog 2 to exciter 2 analog 3 to exciter 10 analog 4/aux. for

C.S.

to exciter

3 AGC reference from

exciter

11 PA fault to exciter

4 PA ground 12 PA ground 5 PA ground 13 mux select 1 from

exciter

6 mux select 2 from

exciter

14 mux select 3 from

exciter

7 key input from

exciter

15 nc

8 reflected sample

(combiner)

to exciter

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 INSTALLATION AND SETUP Rev. A: 03/23/99

Figure 4-1 PA Rear View

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 INSTALLATION AND SETUP

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Table 4-4 PA Board Fuses

PA board fuse label connection

F1 (3A) powers remaining circuitry of

PA board F2 (5A) R9000 J2-2 F3 (3A) RX J2-6 F4 (5A) C2000 J2-8 F5 (3A) DSP exciter J2-4 F6 (3A) powers transistor, first stage and

second stage of PA board F7 (3A) powers remaining circuitry of

PA board

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 INSTALLATION AND SETUP Rev. A: 03/23/99

Glenayre Document Number: 9110.01306 GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Rev. A: 03/23/99 OPERATION

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5OPERATION

5.1 Controls and Indicators

The PA has no indicators nor controls which are suitable for user adjustment.

5.2 Operation

The transmitter normally operates within the paging system in an unattended manner . Local control is not intended for operati on, but for setup, checkout, or maintenance. Refer to the appropriate section:

• Section 7, MAINTENANCE

• Section 8, CHECKOUT AND TROUBLESHOOTING

• Section 9, REMOVAL AND REINSTALLATION

Also refer to VDT manual.

5.2.1 Turn PA On and O ff

Power is supplied to the transmitter and PA whenever the power supply is energized.

5.2.2 Turn Fan On and Off

The fan does not contain an on/off switch, but turns on and off with the power supply. The fan is not equipped with a thermal switch, it runs continuously whenever the power supply equipment is energized.

5.2.3 Key and Unkey PA

The PA does not contain a key switch, but is keyed and unkeyed by the presence of the RF output signal fro m the exci ter when it is keyed. The ex cite r is nor mally key ed an d unkey ed remotely through transmitter controller, but it can be keyed and unkeyed locally throu gh a video display terminal (VDT). Refer to the controller manual for remote key and unkey instructions, or to the DSP exciter VDT manual for local key and unkey instructions.

GL-T8200 1- to 25-Watt 900-MHz Power Amplifier Glenayre Document Number: 9110.01306 OPERATION Rev. A: 03/23/99

+ 54 hidden pages

Glenayre GL-T8200 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual