Motorola GP328 Detailed Service Manual

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8.0 Circuit Board/Schematic Diagrams and Parts List ..........................................6D-24
330-400MHz Main Board Top Side PCB No. 8485726Z04 ...............................6D-24
330-400MHz Main Board Bottom Side PCB No. 8485726Z04 ..........................6D-25
330-400MHz Controls And Switches Schematic Diagram.................................6D-26
330-400MHz Receiver Front End Schematic Diagram......................................6D-27
330-400MHz Receiver Back End Schematic Diagram ......................................6D-28
330-400MHz Synthesizer Schematic Diagram ..................................................6D-29
330-400MHz Voltage Controlled Oscillator Schematic Diagram .......................6D-30
330-400MHz Transmitter Schematic Diagram...................................................6D-31
330-400MHz Radio Parts List............................................................................6D-32
9.0 Troubleshooting charts....................................................................................6D-37
Troubleshooting Flow Chart for Controller.........................................................6D-37
Troubleshooting Flow Chart for Receiver (Sheet 1 of 2)....................................6D-38
Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)....................................6D-39
Troubleshooting Flow Chart for Transmitter ......................................................6D-40
Troubleshooting Flow Chart for Synthesizer......................................................6D-41
Troubleshooting Flow Chart for VCO.................................................................6D-42
Section 6E Model Charts and Test Specifications (29-42/35-50Mhz)
1.0 Model Charts.....................................................................................................6E-1
1.1 29-42MHz ....................................................................................................6E-1
1.2 35-50MHz ....................................................................................................6E-2
2.0 Specifications....................................................................................................6E-3
3.0 Transmitter........................................................................................................6E-4
3.1 General........................................................................................................6E-4
4.0 Receiver............................................................................................................6E-6
4.1 Receiver Front-End......................................................................................6E-6
4.2 Receiver Back-End......................................................................................6E-7
4.3 Automatic Gain Control Circuit ....................................................................6E-7
5.0 Frequency Generation Circuitry ........................................................................6E-8
5.1 Synthesizer.................................................................................................. 6E-9
5.2 VCO - Voltage Controlled Oscillator .......................................................... 6E-10
6.0 Notes For All Schematics and Circuit Boards ................................................. 6E-11
7.0 Circuit Board/Schematic Diagrams and Parts List .......................................... 6E-13
Lowband 29-42/35-50MHz Main Board Top Side PCB No. 8486291A02 .........6E-13
Lowband 29-42/35-50MHz Main Board Bottom Side PCB No. 8486291A02... 6E-14
Lowband 29-42/35-50MHz Controls And Switches Schematic Diagram........... 6E-15
Lowband 29-42/35-50MHz Overall Receiver Schematic Diagram..................... 6E-16
Lowband 29-42/35-50MHz Receiver Front End Schematic Diagram ................ 6E-17
Lowband 29-42/35-50MHz Receiver Back End Schematic Diagram................. 6E-18
Lowband 29-42/35-50MHz Synthesizer Schematic Diagram ............................6E-19
Lowband 29-42/35-50MHz Voltage Controlled Oscillator Schematic Diagram.. 6E-20
Lowband 29-42/35-50MHz Transmitter Schematic Diagram.............................6E-21
Lowband 29-42/35-50MHz Radio Parts List...................................................... 6E-22

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)