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Motorola GM Series Service Information
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Pr
of
essional Radio
GM Series
VHF (136-174MHz)
Ser
vice Inf
or
mation
Issue: September 2000
2
Table of Contents
Default Chapter
2
Computer Software Copyrights
2
Table of Contents
3
Chapter 1 MODEL CHART and TECHNICAL SPECIFICATIONS
5
GM140/GM160 Model Chart
5
GM340/GM360/GM380 Model Chart
6
GM640/GM660/GM1280 Model Chart
7
Technical Specifications
8
Chapter 2 THEORY of OPERATION
11
Introduction
11
VHF (136-174Mhz) Receiver
11
Receiver Front-End
11
Front-End Band-Pass Filters & Pre-Amplifier
12
First Mixer and High Intermediate Frequency (IF)
12
Low Intermediate Frequency (IF) and Receiver Back End
12
VHF (136-174Mhz) Transmitter Power Amplifier (PA) 25 W
13
First Power Controlled Stage
13
Power Controlled Driver Stage
14
Final Stage
14
Directional Coupler
14
Antenna Switch
15
Harmonic Filter
15
Power Control
15
VHF (136-174Mhz) Frequency Synthesis
16
Reference Oscillator
16
Fractional-N Synthesizer
16
Voltage Controlled Oscillator (VCO)
17
Synthesizer Operation
18
VHF (136-174Mhz) Transmitter Power Amplifier (PA) 45 W
19
Power Controlled Stage
19
Pre-Driver Stage
20
Driver Stage
20
Final Stage
20
Directional Coupler
20
Antenna Switch
21
Harmonic Filter
21
Power Control
21
Chapter 3 TROUBLESHOOTING CHARTS
23
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)
23
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)
24
Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3)
25
Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3)
26
Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3)
27
Troubleshooting Flow Chart for 45W Transmitter (Sheet 1 of 2)
28
Troubleshooting Flow Chart for 45W Transmitter (Sheet 2 of 2)
28
Troubleshooting Flow Chart for Synthesizer
30
Troubleshooting Flow Chart for VCO
31
Chapter 4 VHF PCB/SCHEMATICS/PARTS LISTS
33
Allocation of Schematics and Circuit Boards
33
Controller Circuits
33
Other manuals for Motorola GM Series
Installation Manual
36 pages
Service Manual
28 pages
4
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Motorola GM Series Specifications
General
Channels
16
Waterproof
No
Frequency Range
VHF: 136-174 MHz
Signaling
DTMF, MDC1200
Dimensions
56 x 175 x 218 mm
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