Motorola Gm Series Detailed 6864115b62 B Manual

 Professional Radio
GM Series
VHF (136-174MHz)
Service Information
Issue: August 2002 

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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, 25-40W, 4 Ch
MDM25KKF9AA5_E GM160, 136-174 MHz, 25-40W, 128 Ch
MDM25KHC9AA1_EGM140, 136-174 MHz, 1-25W, 4 Ch
MDM25KHF9AA5_E GM160, 136-174 MHz, 1-25W, 128 Ch
Item Description
XXGCN6112_Control Head GM140
X X GCN6114_ Control Head GM160
XIMUD6011_Tanapa, GM140
X IMUD6011_ Tanapa, GM160
XIMUD6010_Tanapa, GM140
X IMUD6010_ Tanapa, GM160...

1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS
2.0 GM340/GM360/GM380 Model Chart 
GM Serie s V HF 13 6-174  MHz
Model Description
MDM25KHC9AN1_EGM340, 136-174 MHz, 1-25W, 6 Ch
MDM25KHF9AN5_E GM360, 136-174 MHz, 1-25W, 255 Ch
MDM25KHC9AN8_EGM380, 136-174 MHz, 1-25W, 255 Ch
M DM 25K HA9A N 0_E   Datab ox, 1 36-1 74  MHz,  1-2 5W , 16  C h
Item Description
XGCN6112_Control Head GM340
X GCN6120_ Control Head GM360
XGCN6121_Control Head GM380
X GCN6116_ Databox Radio Blank Head
XIMUD6013_SField Replaceable Unit...

GM640/GM660/GM1280 Model Chart1-3
3.0 GM640/GM660/GM1280 Model Chart 
GM Series  VHF  136 -174  M Hz
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
M DM 25K HA9C K7_E   Dat ab ox,  13 6-1 74  MHz,  1-2 5W , 16  C h
Item Description
XGCN6112_Control Head GM640
X GCN6120_ Control Head GM660
XGCN6121_Control Head GM1280
X GCN6116_ Databox Radio Blank Head
XIMUD6018_SField Replaceable Unit (Main...

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
Databox
4
128
6
255
255
6 
255
255
16
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...

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