Motorola GP320

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Table of Contents
Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS
1.0 GP320/GP340/GP360/GP380 Model Chart.........................................................1-1
2.0 GP140 Model Chart .............................................................................................1-2
3.0 GP640/GP680 Model Chart .................................................................................1-2
4.0 GP1280 Model Chart ...........................................................................................1-3
5.0 GP240/GP280/GP540/GP580 Model Chart.........................................................1-4
6.0 Technical Specifications ......................................................................................1-5
Chapter 2 THEORY OF OPERATION
1.0 Introduction ..........................................................................................................2-1
2.0 UHF 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 UHF Receiver ......................................................................................................2-3
3.1 Receiver Front-End ........................................................................................2-3
3.2 Receiver Back-End.........................................................................................2-4
3.3 Automatic Gain Control (AGC) .......................................................................2-5
4.0 Frequency Generation Circuit ..............................................................................2-6
4.1 Synthesizer.....................................................................................................2-7
4.2 Voltage Controlled Oscillator (VCO)...............................................................2-8
5.0 Voice Storage (GP1280 Only) ...........................................................................2-10
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