Motorola GP328 Detailed Service Manual

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VHF Receiver Front End Schematic Diagram ................................................... 6B-20
VHF Receiver Back End Schematic Diagram.................................................... 6B-21
VHF Synthesizer Schematic Diagram................................................................6B-22
VHF Voltage Controlled Oscillator Schematic Diagram.....................................6B-23
VHF Transmitter Schematic Diagram................................................................6B-24
VHF Radio Parts List .........................................................................................6B-25
8.0 Circuit Board/Schematic Diagrams and Parts List .......................................... 6B-29
VHF (136-174MHz) Main Board Top Side PCB No. 8486062B16..................... 6B-29
VHF (136-174MHz) Main Board Bottom Side PCB No. 8486062B16 ...............6B-30
VHF Controls And Switches Schematic Diagram..............................................6B-31
VHF Receiver Front End Schematic Diagram ................................................... 6B-32
VHF Receiver Back End Schematic Diagram.................................................... 6B-33
VHF Synthesizer Schematic Diagram................................................................6B-34
VHF Voltage Controlled Oscillator Schematic Diagram.....................................6B-35
VHF Transmitter Schematic Diagram................................................................6B-36
VHF Radio Parts List .........................................................................................6B-37
9.0 Troubleshooting charts....................................................................................6B-41
Troubleshooting Flow Chart for Controller.........................................................6B-41
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2).................................... 6B-42
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2).................................... 6B-43
Troubleshooting Flow Chart for Transmitter ...................................................... 6B-44
Troubleshooting Flow Chart for Synthesizer...................................................... 6B-45
Troubleshooting Flow Chart for VCO.................................................................6B-46
Section 6C Model Chart and Test Specifications (450-527 Mhz)
1.0 Model Chart.......................................................................................................6C-1
2.0 Specifications....................................................................................................6C-2
3.0 Transmitter........................................................................................................6C-3
3.1 General........................................................................................................6C-3
4.0 Receiver............................................................................................................6C-5
4.1 Receiver Front-End......................................................................................6C-5
4.2 Receiver Back-End......................................................................................6C-6
4.3 Automatic Gain Control Circuit ....................................................................6C-7
5.0 Frequency Generation Circuitry ........................................................................6C-8
5.1 Synthesizer..................................................................................................6C-9
5.2 VCO - Voltage Controlled Oscillator ..........................................................6C-10
6.0 Notes For All Schematics and Circuit Boards .................................................6C-12
7.0 Circuit Board/Schematic Diagrams and Parts List ..........................................6C-13
UHF Band 2 (450-527MHz) Main Board Top Side PCB No. 8485641Z02........6C-13
UHF Band 2 (450-527MHz) Main Board Bottom Side PCB No. 8485641Z02...6C-14
UHF Band 2 Controls And Switches Schematic Diagram..................................6C-15
UHF Band 2 Receiver Front End Schematic Diagram.......................................6C-16
UHF Band 2 Receiver Back End Schematic Diagram.......................................6C-17
UHF Band 2 Synthesizer Schematic Diagram...................................................6C-18
UHF Band 2 Voltage Controlled Oscillator Schematic Diagram ........................6C-19

Motorola GP328 Specifications

General

Channel Capacity	16 channels
Operating Temperature	-30°C to +60°C
Sealing	IP54
Frequency Range	136-174 MHz (VHF), 403-470 MHz (UHF)
Power Output	1-5W (VHF), 1-4W (UHF)
Dimensions	137 x 57.5 x 37.5 mm
Power Supply	7.5V
Battery Life	8 hours (High Power), 11 hours (Low Power) with standard NiMH battery
Weight	420g (with standard battery)