Professional Radio
GP Series
300R1 (300 - 350MHz)
Service Information
Issue: June 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 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.
Table of Contents
Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GP340 Model Chart .............................................................................................1-1
2.0 GP640 / GP680 Model Chart...............................................................................1-1
3.0 Technical Specifications ......................................................................................1-2
Chapter 2 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................2-1
2.0 Transmitter...........................................................................................................2-1
2.1 Power Amplifier ..............................................................................................2-1
2.2 Antenna Switch...............................................................................................2-2
2.3 Harmonic Filter ...............................................................................................2-2
2.4 Antenna Matching Network ............................................................................2-2
2.5 Power Control Integrated Circuit (PCIC) ........................................................2-2
3.0 Receiver...............................................................................................................2-3
3.1 Receiver Front-End ........................................................................................2-3
3.2 Receiver Back-End.........................................................................................2-4
3.3 Automatic Gain Control Circuit .......................................................................2-5
4.0 Frequency Generation Circuitry...........................................................................2-6
4.1 Synthesizer.....................................................................................................2-6
4.2 Voltage Controlled Oscillator (VCO)...............................................................2-8
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Chapter 3 TROUBLESHOOTING CHARTS
1.0 Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)......................................3-1
2.0 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)......................................3-2
3.0 Troubleshooting Flow Chart for Transmitter ........................................................3-3
4.0 Troubleshooting Flow Chart for Synthesizer........................................................3-4
5.0 Troubleshooting Flow Chart for VCO...................................................................3-5
Chapter 4 PCB/SCHEMATICS/PARTS LISTS
1.0 Allocation of Schematics and Circuit Boards .......................................................4-1
1.1 Controller Circuits ...........................................................................................4-1
2.0 PCB 8485726Z01 - Schematics...........................................................................4-3
3.0 PCB 8485726Z01 - Parts List ............................................................................4-11
4.0 PCB 8485726Z04 - Schematics.........................................................................4-14
5.0 PCB 8485726Z04 - Parts List ............................................................................4-22
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MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GP340 Model Chart
Professional GP300 Series (300-350MHz)
Model Description
MDH25EDC9AN3_E GP340 300R1 300-350 MHz 4W 16 CH
Item Description
X PMLD4141_ GP340 Back Cover Kit
X 6864110B13_ GP340 Basic User Guide
X PMAD4022_ 9cm (300-344 MHz) Antenna
X HNN9008_ Battery, NiMH Standard
Chapter 1
x = Indicates one of each is required.
2.0 GP640 / GP680 Model Chart
Professional GP600 Series (300-350MHz)
Model Description
MDH25EDC9CK3_E GP640 300R1 300-350 MHz 4W
MDH25EDH9CK6_E GP680 300R1 300-350 MHz 4W
Item Description
X PMLD4125_ GP640 300R1 Back Cover Kit
X PMLD4126_ GP680 300R1 Back Cover Kit
X 6864110B14_ GP640 Basic User Guide
X 6864110B19_ GP680 Basic User Guide
X X PMAD4022_ 9cm (300-344 MHz) Antenna
X X HNN9008_ Battery, NiMH Standard
x = Indicates one of each is required.
1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS
3.0 Technical Specifications
Data is specified for +25°C unless otherwise stated.
General Specifications
Channel Capacity
GP340
GP640
GP680
Power Supply Rechargeable battery 7.5v
Dimensions: H x W x D (mm) Height excluding knobs
With standard high capacity NiMH battery
With ultra high capacity NiMH battery
With NiCD battery
With Lilon battery
Weight: (gm)
With Standard high capacity NiMH battery
With Ultra high capacity NiMH battery
With NiCD battery
With Lilon battery
Average Battery Life @5/5/90 Cycle:
With Standard high capacity NiMH battery
With Ultra high capacity NiMH battery
With NiCD battery
With Lilon battery
Sealing: Withstands rain testing per
Shock and Vibration: Protection provided via impact
Dust and Humidity: Protection provided via environment
16
16 (Conventional)
16 (Conventional)
137 x 57.5 x 37.5
137 x 57.5 x 40.0
137 x 57.5 x 40.0
137 x 57.5 x 33.0
GP340/GP640 GP680
420 428
500 508
450 458
350 358
Low Power High Power
11 hours 8 hours
14 hours 11 hours
12 hours 9 hours
11 hours 8 hours
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 1-3
Transmitter 300R1
*Frequencies - Full Bandsplit 300-350 MHz
Channel Spacing 12.5/20/25 kHz
Frequency Stability
(-25°C to +55°C, +25° Ref.)
Power 1-4W
Modulation Limiting
FM Hum & Noise -40 dB typical
Conducted/Radiated Emission
Adjacent Channel Power
Audio Response (300 - 3000 Hz) +1 to -3 dB
Audio Distortion <5% typical
±2.5 ppm @ 12.5kHz
±5ppm @ 25 kHz
±2.5 @ 12.5 kHz
±4.0 @ 20 kHz
±5.0 @ 25 kHz
-36 dBm <1 GHz
-30 dBm >1 GHz
-60 dB @ 12.5 kHz
-70 dB @ 25 kHz
Receiver 300R1
*Frequencies - Full Bandsplit 300-350 MHz
Channel Spacing 12.5/20/25 kHz
Sensitivity (12 dB SINAD) EIA
Sensitivity (20 dB SINAD) ETS
0.35 µV typical
0.50 µV typical
Intermodulation ETS -65 dB
Adjacent Channel Selectivity
Spurious Rejection -70 dB
Rated Audio 0.5W
Audio Distortion @ Rated Audio <3% typical
Hum & Noise
Audio Response (300 - 3000 Hz) +1 to -3 dB
Conducted Spurious Emission
-60 dB @ 12.5 kHz
-70 dB @ 25 kHz
-45 dB @ 12.5 kHz
-50 dB @ 20/25 kHz
-57 dBm <1 GHz
-47 dBm >1 GHz
ETS 300 086
*Availability subject to the laws and regulations of individual countries.
1-4 MODEL CHART AND TECHNICAL SPECIFICATIONS
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