Motorola Vhf Manual

 Professional Radio
GM Series
VHF (136-174MHz)
Service Information
Issue: September 2000 

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Computer Software Copyrights
The Motorola products described in this manual may include copyrighted Motorola computer programs stored 
in semiconductor memories or other media. Laws in the United States and other countries preserve for 
Motorola certain exclusive rights for copyrighted computer programs, including the exclusive right to copy or 
reproduce in any form, the copyrighted computer program. Accordingly, any copyrighted Motorola computer 
programs contained in the Motorola products described...

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Table of Contents
Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart ................................................................................ 1-1
2.0 GM340/GM360/GM380 Model Chart ................................................................... 1-1
3.0 GM640/GM660/GM1280 Model Chart ................................................................. 1-2
4.0 Technical Specifications...

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Chapter 3 TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) ..................................... 3-1
1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) ..................................... 3-2
2.0 Troubleshooting Flow Chart for 25W Transmitter (Sheet 1 of 3) ......................... 3-3
2.1 Troubleshooting Flow Chart for 25W Transmitter (Sheet 2 of 3) ......................... 3-4
2.2 Troubleshooting Flow Chart for 25W Transmitter (Sheet 3 of 3)...

Chapter 1
MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GM140/GM160 Model Chart
GM Series VHF 136-174 MHz
Model Description
MDM25KKC9AA1_EGM140, 136-174 MHz, 25-45W, 4 Ch
MDM25KKF9AA5_E GM160, 136-174 MHz, 25-45W, 128 Ch
Item Description
XGCN6112_Control Head, GM140
X GCN6114_ Control Head, GM160
XIMUD6015_SField Replaceable Unit (Main Board) GM140
X IMUD6015_S Field Replaceable Unit (Main Board) GM160
XXENBN4056_Packaging, Waris Mobile Radio
X X GLN7324_ Low Profile Mounting Trunnion
XXHKN9402_12V Power...

1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS
2.0 GM340/GM360/GM380 Model Chart
GM Series VHF 136-174 MHz
Model Description
MDM25KHC9AN1_EGM340, 136-174 MHz, 1-25W, 6 Ch
MDM25KHF9AN5_E GM360, 136-174 MHz, 1-25W, 255 Ch
MDM25KHN9AN8_EGM380, 136-174 MHz, 1-25W, 255 Ch
Item Description
X GCN6112_ Control Head GM340
XGCN6120_Control Head GM360
X GCN6121_ Control Head GM380
XIMUD6013_SField Replaceable Unit (Main Board) GM340
X IMUD6013_S Field Replaceable Unit (Main Board) GM360
XIMUD6024_SField Replaceable...

GM640/GM660/GM1280 Model Chart1-3
3.0 GM640/GM660/GM1280 Model Chart
GM Series VHF 136-174 MHz
Model Description
MDM25KHC9CK1_EGM640, 136-174 MHz, 1-25W, 6 Ch
MDM25KHF9CK5_E GM660, 136-174 MHz, 1-25W, 255 Ch
MDM25KHN9CK8_EGM1280, 136-174 MHz, 1-25W, 255 Ch
Item Description
X GCN6112_ Control Head GM640
XGCN6120_Control Head GM660
X GCN6121_ Control Head GM1280
XIMUD6018_SField Replaceable Unit (Main Board) GM640
X IMUD6018_S Field Replaceable Unit (Main Board) GM660
XIMUD6018_SField Replaceable Unit...

1-4 MODEL CHART AND TECHNICAL SPECIFICATIONS
4.0 Technical Specifications
Data is specified for +25°C unless otherwise stated.
General Specifications
Channel Capacity
GM140
GM160
GM340
GM360
GM380
GM640
GM660
GM1280
4
128
6
255
255
6 
255
255
Power Supply 13.2Vdc (10.8 - 15.6Vdc)
Dimensions:  H x W x D (mm)  Depth excluding knobsGM140/340/640
56mm x 176mm x 177mm (1 - 25W)
56mm x 176mm x 189mm (25 - 45W)
(add 8mm for Volume Knob)
Dimensions:  H x W x D (mm)  Depth excluding knobsGM160/360/660
59mm x 179mm x...

Technical Specifications1-5
*Availability subject to the laws and regulations of individual countries.
Transmitter VHF
*Frequencies - Full BandsplitVHF 136-174 MHz
Channel Spacing12.5/20/25 kHz
Frequency Stability
(-30°C to +60°C, +25° Ref.)±2.5 ppm
Power 1-25W / 25-45W
Modulation Limiting±2.5 @ 12.5 kHz 
±4.0 @ 20 kHz
±5.0 @ 25 kHz
FM Hum & Noise-40 dB @ 12.5kHz
-45 dB @ 20/25kHz
Conducted/Radiated Emission (ETS)-36 dBm 1 GHz
Adjacent Channel Power-60 dB @ 12.5 kHz
-70 dB @ 25 kHz
Audio Response (300 -...

1-6 MODEL CHART AND TECHNICAL SPECIFICATIONS