Motorola GM140, GM160, GM340, GM360, GM380 UHF Service

Professional Radio

GM Series

UHF (403-470MHz)

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 royalty­free license to use that arises by operation of law in the sale of a product.

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 UHF (403-470MHz) 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 UHF (403-470MHz)

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 UHF (403-470MHz) 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 UHF (403-470MHz)

5.1 Power Controlled Stage..................................................................................2-9

5.2 Pre-Driver Stage.............................................................................................2-9

5.3 Driver Stage..................................................................................................2-10

5.4 Final Stage ...................................................................................................2-10

5.5 Directional Coupler.......................................................................................2-10

5.6 Antenna Switch.............................................................................................2-10

5.7 Harmonic Filter.............................................................................................2-10

5.8 Power Control...............................................................................................2-11

Transmitter Power Amplifier (PA) 25 W.....................2-3

Transmitter Power Amplifier (PA) 45 W.....................2-9

iii

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).........................3-5

3.0 Troubleshooting Flow Chart for 40W Transmitter ...............................................3-6

4.0 Troubleshooting Flow Chart for Synthesizer........................................................3-7

5.0 Troubleshooting Flow Chart for VCO...................................................................3-8

Chapter 4 UHF PCB/SCHEMATICS/PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards.......................................................4-1

1.1 Controller Circuits................................................................................................4-1

2.0 UHF 1-25W PCB 8485670z02 / Schematics.......................................................4-3

2.1 UHF 1-25W PCB 8485670z02 Parts List...........................................................4-10

3.0 UHF 25-40W PCB 8480643z06 / Schematics...................................................4-13

3.1 UHF 25-40W PCB 8480643z06 Parts List.........................................................4-20

MODEL CHART AND TECHNICAL SPECIFICATIONS

1.0 GM140/GM160 Model Chart

GM Series UHF 403-470 MHz

Model Description

MDM25RKC9AA1_E GM140, 403-470 MHz, 25-40W, 4 Ch

MDM25RKF9AA5_E GM160, 403-470 MHz, 25-40W, 128 Ch

Item Description

X GCN6112_ Control Head GM140

X GCN6114_ Control Head GM160

X IMUE6024_S Field Replaceable Unit (Main Board) GM140

X IMUE6024_S Field Replaceable Unit (Main Board) GM160
X X ENBN4056_ Packaging, Waris Mobile Radio
X X GLN7324_ Low Profile Mounting Trunnion
X X HKN9402_ 12V Power Cable, 25-45W
X X MDRMN4025_ Enhanced Compact Microphone
X 6864110B86 User Guide, GM140

X 6864110B87 User Guide, GM160
X = Indicates one of each is required

Chapter 1

1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS

2.0 GM340/GM360/GM380 Model Chart

GM Series UHF 403-470 MHz

Model Description

MDM25RHC9AN1_E GM340, 403-470 MHz, 1-25W, 6 Ch

MDM25RHF9AN5_E GM360, 403-470 MHz, 1-25W, 255 Ch

MDM25RHN9AN8_E GM380, 403-470 MHz, 1-25W, 255 Ch

Item Description

X GCN6112_ Control Head GM340

X GCN6120_ Control Head GM360

X GCN6121_ Control Head GM380

X IMUE6015_S Field Replaceable Unit (Main Board) GM340

X IMUE6015_S Field Replaceable Unit (Main Board) GM360

X IMUE6038_S Field Replaceable Unit (Main Board) GM380
X X X ENBN4056_ Packaging, W aris Mobile
X X X GLN7324_ Low Profile Mounting Trunnion
X X X HKN4137_ 12V Power Cable 1-25W
X X X MDRMN4025_ Enhanced Compact Microphone
X 6864110B80 User Guide GM340

X 6864110B81 User Guide, GM360

X 6864110B82 User Guide, GM380

X = Indicates one of each is required

GM640/GM660/GM1280 Model Chart 1-3

3.0 GM640/GM660/GM1280 Model Chart

GM Series UHF 403-470 MHz

Model Description

MDM25RHC9CK1_E GM640, 403-470 MHz, 1-25W, 6 Ch

MDM25RHF9CK5_E GM660, 403-470 MHz, 1-25W, 255 Ch

MDM25RHN9CK8_E GM1280, 403-470 MHz, 1-25W, 255 Ch

Item Description

X GCN6112_ Control Head GM640

X GCN6120_ Control Head GM660

X GCN6121_ Control Head GM1280
X IMUE6009_S Field Replaceable Unit (Main Board) GM640

X IMUE6009_S Field Replaceable Unit (Main Board) GM660

X IMUE6009_S Field Replaceable Unit (Main Board) GM1280
X X X ENBN4056_ Packaging, Waris Mobile Radio
X X X GLN7324_ Low Profile Mounting Trunnion
X X X HKN4137_ 12V Power Cable, 1-25W
X X X MDRMN4025_ Enhanced Compact Microphone
X 6864110B83_ User Guide, GM640

X 6864110B84_ 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

Power Supply 13.2Vdc (10.8 - 15.6Vdc)
Dimensions: H x W x D (mm) Depth excluding knobs GM140/340/640

Dimensions: H x W x D (mm) Depth excluding knobs GM160/360/660

Dimensions: H x W x D (mm) Depth excluding knobs GM380/1280

Weight GM140/340/640 1400gr
Weight GM160/360/660 1400gr
Weight GM380/1280 1500gr
Sealing: Withstands rain testing per

Shock and Vibration: Protection provided via impact

Dust and Humidity: Protection provided via environment

4
128
6
255
255
6
255
255

56mm x 176mm x 177mm (1 - 25W)
56mm x 176mm x 189mm (25 - 45W)

(add 8mm for Volume Knob)

59mm x 179mm x 186mm (1 - 25W)
59mm x 179mm x 198mm (25 - 45W)

(add 9mm for Volume Knob)

72mm x 185mm x 188mm

(add 8mm for Volume Knob)

MIL STD 810 C/D /E and IP54

resistant housing exceeding MIL STD
810-C/D /E and TIA/EIA 603

resistant housing exceeding MIL STD
810 C/D /E and TIA/EIA 603

Technical Specifications 1-5

Transmitter UHF

*Frequencies - Full Bandsplit UHF 403-470 MHz
Channel Spacing 12.5/20/25 kHz
Frequency Stability

(-30°C to +60°C, +25° Ref.)
Power 1-25W/25-40W

Modulation Limiting

FM Hum & Noise

Conducted/Radiated Emission (ETS)

Adjacent Channel Power

Audio Response (300 - 3000 Hz) +1 to -3 dB
Audio Distortion

@1000Hz, 60%
Rated Maximum Deviation

±2.0 ppm

±2.5 @ 12.5 kHz

±4.0 @ 20 kHz
±5.0 @ 25 kHz

-40 dB @ 12.5kHz

-45 dB @ 20/25kHz

-36 dBm <1 GHz

-30 dBm >1 GHz

-60 dB @ 12.5 kHz

-70 dB @ 25 kHz

<3% typical

Receiver UHF

*Frequencies - Full Bandsplit UHF 403-470 MHz
Channel Spacing 12.5/20/25 kHz
Sensitivity (12 dB SINAD) 0.30 µV (0.22 µV typical)

>65 dB

Intermodulation (ETS)

Adjacent Channel Selectivity (ETS)

Spurious Rejection (ETS)

Rated Audio

Audio Distortion @ Rated Audio <3% typical

Hum & Noise

Audio Response (300 - 3000Hz @ 20/25kHz)
(300 - 2550Hz @12.5kHz)

Conducted Spurious Emission (ETS)

Base Mode: >70dB

(1-25W model only)

65 dB @ 12.5 kHz

70 dB @ 20 kHz
75 dB @ 25 kHz

70 dB @ 12.5 kHz

75 dB @ 20/25 kHz

3W Internal

13W External

-40 dB @ 12.5 kHz

-45 dB @ 20/25 kHz

+1 to -3 dB

-57 dBm <1 GHz

-47 dBm >1 GHz

*Availability subject to the laws and regulations of individual countries.

1-6 MODEL CHART AND TECHNICAL SPECIFICATIONS