Motorola Vhf Manual
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Professional Radio GM Series VHF (136-174MHz) Service Information Issue: September 2000
ii 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 in this manual may not be copied or reproduced in any manner without the express written permission of Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant, either directly or by implication, estoppel or otherwise, any license under the copyrights, patents or patent applications of Motorola, except for the normal non-exclusive royalty- free license to use that arises by operation of law in the sale of a product.
iii 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 ...................................................................................... 1-3 Chapter 2 THEORY OF OPERATION 1.0 Introduction .......................................................................................................... 2-1 2.0 VHF (136-174MHz) Receiver............................................................................... 2-1 2.1 Receiver Front-End ........................................................................................ 2-1 2.1 Front-End Band-Pass Filters & Pre-Amplifier ................................................. 2-2 2.2 First Mixer and High Intermediate Frequency (IF) .......................................... 2-2 2.3 Low Intermediate Frequency (IF) and Receiver Back End ............................. 2-2 3.0 VHF (136-174MHz) Transmitter Power Amplifier (PA) 25 W...................... 2-3 3.1 First Power Controlled Stage .......................................................................... 2-3 3.2 Power Controlled Driver Stage ....................................................................... 2-4 3.3 Final Stage ..................................................................................................... 2-4 3.4 Directional Coupler......................................................................................... 2-4 3.5 Antenna Switch............................................................................................... 2-5 3.6 Harmonic Filter ............................................................................................... 2-5 3.7 Power Control ................................................................................................. 2-5 4.0 VHF (136-174MHz) Frequency Synthesis ........................................................... 2-6 4.1 Reference Oscillator ....................................................................................... 2-6 4.2 Fractional-N Synthesizer ................................................................................ 2-6 4.3 Voltage Controlled Oscillator (VCO) ............................................................... 2-7 4.4 Synthesizer Operation .................................................................................... 2-8 5.0 VHF (136-174MHz) Transmitter Power Amplifier (PA) 45 W..................... 2-9 5.1 Power Controlled Stage .................................................................................. 2-9 5.2 Pre-Driver Stage ........................................................................................... 2-10 5.3 Driver Stage.................................................................................................. 2-10 5.4 Final Stage ................................................................................................... 2-10 5.5 Directional Coupler....................................................................................... 2-10 5.6 Antenna Switch............................................................................................. 2-11 5.7 Harmonic Filter ............................................................................................. 2-11 5.8 Power Control ............................................................................................... 2-11
iv 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) ......................... 3-3 3.0 Troubleshooting Flow Chart for 45W Transmitter (Sheet 1 of 2) ......................... 3-4 3.1 Troubleshooting Flow Chart for 45W Transmitter (Sheet 2 of 2) ......................... 3-4 4.0 Troubleshooting Flow Chart for Synthesizer........................................................ 3-5 5.0 Troubleshooting Flow Chart for VCO................................................................... 3-6 Chapter 4 VHF PCB/SCHEMATICS/PARTS LISTS 1.0 Allocation of Schematics and Circuit Boards ....................................................... 4-1 1.1 Controller Circuits ................................................................................................ 4-1 2.0 VHF 1-25W PCB 8486172B04 / Schematics....................................................... 4-3 2.1 VHF 1-25W PCB 8486172B04 Parts List ......................................................... 4-10 3.0 VHF 1-25W PCB 8486172B06 / Schematics..................................................... 4-13 3.1 VHF 1-25W PCB 8486172B06 Parts List .......................................................... 4-20 4.0 VHF 1-25W PCB 8486172B07 / Schematics..................................................... 4-23 4.1 VHF 1-25W PCB 8486172B07 Parts List .......................................................... 4-27 5.0 VHF 25-45W PCB 8486140B12 / Schematics................................................... 4-30 5.1 VHF 25-45W PCB 8486140B12 Parts List ........................................................ 4-33
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 Cable, 25-45W X X MDRMN4025_ Enhanced Compact Microphone X6864110B86User Guide, GM140 X 6864110B87 User Guide, GM160 X = Indicates one of each is required
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 Unit (Main Board) GM380 X X X ENBN4056_ Packaging, Waris Mobile XXXGLN7324_Low Profile Mounting Trunnion X X X HKN4137_ 12V Power Cable 1-25W XXXMDRMN4025_Enhanced Compact Microphone X 6864110B80 User Guide GM340 X6864110B81User Guide, GM360 X 6864110B82 User Guide, GM380 X = Indicates one of each is required
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 (Main Board) GM1280 X X X ENBN4056_ Packaging, Waris Mobile Radio XXXGLN7324_Low Profile Mounting Trunnion X X X HKN4137_ 12V Power Cable, 1-25W XXXMDRMN4025_Enhanced Compact Microphone X 6864110B83_ User Guide, GM640 X6864110B84_User Guide, GM660 X 6864110B85_ User Guide, GM1280 X = Indicates one of each is required.
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 186mm (1 - 25W) 59mm x 179mm x 198mm (25 - 45W) (add 9mm for Volume Knob) Dimensions: H x W x D (mm) Depth excluding knobsGM380/1280 188mm x 185mm x 72mm (add 8mm for Volume Knob) Weight GM140/340/640 1400gr Weight GM160/360/660 1400gr Weight GM380/1280 1500gr Sealing:Withstands rain testing per MIL STD 810 C/D /E and IP54 Shock and Vibration:Protection provided via impact resistant housing exceeding MIL STD 810-C/D /E and TIA/EIA 603 Dust and Humidity:Protection provided via environment resistant housing exceeding MIL STD 810 C/D /E and TIA/EIA 603
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 - 3000Hz)+1 to -3 dB Audio Distortion @1000Hz, 60% Rated Maximum Deviation65 dB Base Mode: >70dB (1-25W model only) Adjacent Channel Selectivity (ETS)65 dB @ 12.5 kHz 75 dB @ 20 kHz 80 dB @ 25 kHz Spurious Rejection (ETS)75 dB @ 12.5 kHz 80 dB @ 20/25 kHz Rated Audio3W Internal 13W External Audio Distortion @ Rated Audio