Motorola LBI-38653 User Manual

LBI-38653

Mobile Communications

MDS

440-512 MHz MOBILE RADIO COMBINATION

TABLE OF CONT EN TS

MAIN BOARD ASSEM B LY...........................................LBI-38760

FRONT PANEL ASSEMBL Y................. ....... .... ..... ....... ..LBI-38757

POWER AMPLIFIER ASSEM BLY.................................LBI-38761

SERVICE SECTION............... .........................................LBI-38759

Maintenance Manual

Printed in U.S.A.

LBI-38653 LBI-38653

SPECIFICATIONS

TABLE OF CONTENTS

GENERAL

Page

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

PACKAGE NUMBERS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

OPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

RADIO DESCRIPTIO N . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

MAIN BOARD ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

FRONT PANEL ASSEM BLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

POWER AMPLIFIER ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

PC PROGRAMMABLE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

BATTERY POWER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

EXTERNAL SPEAKER (Optional) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

EASY ACCESSIBILITY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

DET AILED TYPE 99 OPERATION AND PROGRAMMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

GE TYPE 99 FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

MOTOROLA FORMAT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Frequency Range Trans mit: 440-470 MHz (UHF MID SPLIT)

470-512 MHz (UHF HI SPLIT)

Receive: Same as Transmit

Channel Spacing 25 kHz Frequency Stability ±5.0 ppm Operating Temp er at ur e Ran ge -30 to +60°C Battery Voltage 13.6 volts ±10% (meets specs)

±20% (operational)

Radio Current Drain OFF: 0.01 amps

RX Squelched: 0.9 amps RX On: 1.5 amps TX On: 10.0 amps

Size 170mm W x 216mm L x 53mm H

TRANSMITTER

TX Two Frequency Spread Full Band split RF Power Output 40 watts min (+146 dBm)

MECHANICAL PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

MECHANICAL PARTS BREAKDOWN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

FIGURES

Figure 1 - MDS Conventional Radio Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

TABLES

T a ble 1 - Channel Guard Tone Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 2 - Primary Digital and Equivalent Digital Codes (OCTA L) . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Table 3 - Tone Groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

T a ble 4 - Tone Generator Frequencies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Table 5 - Motorola Type Coder Numbers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 6 - Motorola Group Call Tone Groups (TG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Table 7 - Motorola Group Call Tone Groups (TG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Maximum Deviation ±5% kHz peak TX Duty Cycle 20% Intermittent (EIA) FM Hum and Noise (EIA) -45 dBc maximum Audio Distortion 5% @ 300 Hz, 3% @ 1 kHz, 5% @ 3 kHz RF Load Impedance 50 ohms

Audio Sensitivity 80 mV ±3 dB Audio Frequency Response Within +1,-3 dB of a 6 dB/octave pre-emphasis,

300-3000 Hz (EIA)

Spurious Emissions

Conducted -16.5 dBm max (Meets DOC & FCC) Radiated -13 dBm max (FCC)

RECEIVER

Receiver coverag e 440-470 MHz, 470-512 MHz

Factory Tu ned 450-462 MHz, 470-482 MHz

RX T wo Freq Spread 12 MHz (No degradation) Channel Spacing ±25 kHz

Sensitivity (12 dB SINAD) - 117 dBm (.30 µV)

LBI-38653 LBI-38653

SPEC I F IC AT I ONS ( Co n t .)

Spurious Emissions

Radiated Meets FCC requirements

Conducted -57 dBm maximum RX Spurious Response 70 dB minimum Adj Ch(2-Sig) Selectivity -70 dB max @ 25 kH z (E IA) Intermodulation A ttenuati on -70 dB minimum

RX Modulatio n Accep tance ±7 kHz minimum Audio Distortion 2% maximum @ 0.5 Watt (EIA)

10% maximum @ 4 Watts and 1 kHz

Audio Frequency Response Within +2, -8 or a 6 dB/octave de-emphases,

300-3000 Hz (EIA)

RX Hum and Noise

Unsquelched -45 dB maximum

Squelched -70 dB maximum Audio Output Power 4 watts, @ < 10% Distortion Speaker Impedance 4 ohms

MDS RADIO PACKAGE NUMBERS

PACKAGE NUMBER DESCRIPTION

TLU22 UHF MID-SPLIT 2 CHANNEL, 40 WATT TLU28 UHF MID-SPLIT 8 CHANNEL, 40 WATT TLU32 UHF HI-SPLIT 2 CHANNEL, 40 WATT TLU38 UHF HI-SPLIT 8 CHANNEL, 40 WATT

OPTIONS

OPTION NUMBER DESCRIPTION

MC3G DESK TO P MIC

AN1R 1/4 WAVE, ROOF MT AN TENNA W/TNC CONNECTOR ZM3L EXTERNAL WEATHERPROOF SPEAKER AND CABLE

LS1F MIL SPEC SPEAKER, 4 OHMS, 5 x 5 CD1E SPEAKER CABLE PD1A NOISE FI LTER KIT SU1C ALARM RELAY KIT EC1A DOC POWER SET

MA1L DESK TOP RADIO MOUNTING W EDGE

PS1D 240 VAC-12 VDC, 13A 50/60 Hz Power Supply

PS5K 120 VAC-12 VDC, 13A 50/60 Hz Power Supply

INTRODUCTION

The Ericsson GE Co nv entional MDS Radio is a rugged two-way FM mobile radio which operates in the 440-470 MHz and 470-512 MHz fr equen cy b ands. T he MDS is a wide band synthesized radio utilizing microcomputer technology to provide reliable high quality simplex two-way mobile communications. Its transmitter output power level is 40 watts over the wide bandwidth of each split. The receiver has an allowable 12 MHz maximum receive channel separation. There are two versions a v ai lable for each split, a 2-channel and an 8channel. The basic radio package includes the following features:

• Microprocessor Control

• Synthesized RF Channel selection (frequency control)

• 7-Segment LED Channel Display

• Multi-ton e Channel Guard (CTCSS) Enco de/ D ec o de

• Multi-code Digital Channel Guard (DCG) Encode/De-

code

• Automatic Hook Switch Channel guard Disable

• Channel Activit y S ensing (CAS)

• Carrier Control T i m e r (CCT)

• ±5 ppm frequency stability

• Talkaround, radio to radio direct Communication

• Type 99 Tone Decode

• Field Programmable with PC

• Fixed Squelch, threshold programm able

• Internal 4-watt Speaker, with volume control

• Front Mounted Microphone Connector

• Rear Mounted Antenna TNC Connector

• Rear entry power connections

• ANI Encode

The small size of the MDS radio makes it ideal for front mounting in conventi on al ve hicles. The radio is operated with a simple hand held microphone i n combination with the f ollowing operating controls, all located on the front panel.

• Power ON/OFF Switch

• Channel UP/DOWN Selector

• Volume UP/DOWN Control

• Monitor Switch for Channel Guard Disable

• T ype 99 Tone RES ET Sw itch, to res et the tone de code r.

Refer to the Operator’s Manual LBI-38651 for a co mp lete

description of the operating proced ures.

RADIO DESCRIPTION

MAIN BOARD ASSEMBLY

A sturdy aluminum casting houses the Main Board Assembly (N29/85154001220 for the 440-470 MHz band N29/85154001250 for the 470-512 MHz band). There is complete accessibility to the Main Board with the radio’s top and bottom covers removed. Th e Main Board contains the following circuits:

• Microprocessor and associate d Lo gic

• Frequency Synthesizer

• Tr ans mitt er Ex ci te r

• Receiv er

• Audio Processing (for both transmit an d r ecei ve p aths)

• Tone and Squelch Processing (for both transmit and

receive paths)

• Voltage Re gulat ors

Logic Circuitry

The radio’s logic circuitry includes the 80C535 microprocessor with associated EPROM a nd Ele ctrica lly E rasable PROM (EEPROM) memory and latch circuitry. The Microprocessor controls the functions of the transmitter, the receiver, the inputs from the oper ato r and the outputs to the operator.

Synthesizer

A programmable Synthesizer generates both transmit and receive operating frequencies. It includes a synthesizer chip, a dual modulus counter, a temperature compensated reference oscillat or ( TCXO) and a v oltag e co ntrol led o sci llator ( VCO); a ll part of an operating phase lock loop, w ith its requisite loop filte r.

T ransmitter

The radio transmitter includes th e Synth esizer’s modulated VCO and the fixed tuned exciter amplifiers. The exciter amplifiers are wideband, covering both splits in the UHF band without retuning. The exciter output is fed to the Power Amplifier Board through a coax cable. The exciter provides 35 dB of gai n to drive the Power Ampli fier with 3 watts. Th e tra nsmitte r output level at the antenna connector is factory set for a rated output power of 40 watts. The power control circuit detects the power output of the Power Amplifier. Using the er ror sign al, the power co ntrol circuit varies the DC supply voltage to the first stage of the exciter. This will hold the transmitter output level constant.

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