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iii

Table of Contents

Chapter 1 THEORY OF OPERATION

1.0 Introduction ..........................................................................................................1-1

2.0 UHF Transmitter ..................................................................................................1-1

2.1 Power Amplifier ..............................................................................................1-1

2.2 Antenna Switch...............................................................................................1-2

2.3 Harmonic Filter ...............................................................................................1-2

2.4 Antenna Matching Network ............................................................................1-2

2.5 Power Control Integrated Circuit (PCIC) ........................................................1-2

3.0 UHF Transmitter (for ATEX specified models).....................................................1-3

3.1 General...........................................................................................................1-3

4.0 UHF Receiver (All models except those with PCB 8486458Z03 & 8486743Z02)1-5

4.1 Receiver Front-End ........................................................................................1-5

4.2 Receiver Back-End.........................................................................................1-6

4.3 Automatic Gain Control (AGC) .......................................................................1-7

5.0 UHF Reciever (for ATEX specified models).........................................................1-8

5.1 Reciever Front-End ........................................................................................1-8

5.2 Reciever Back-End.........................................................................................1-9

6.0 UHF Receiver (Models with PCB 8486458Z03) ................................................1-10

6.1 Receiver Front-End ......................................................................................1-10

6.2 Receiver Back-End.......................................................................................1-11

7.0 Frequency Generation Circuit............................................................................1-12

7.1 Synthesizer...................................................................................................1-13

7.2 Voltage Controlled Oscillator (VCO).............................................................1-14

8.0 Controller Information ........................................................................................1-16

8.1 Radio Power Distribution..............................................................................1-16

8.2 Controller Board ...........................................................................................1-17

9.0 Voice Storage (GP1280 Only) ...........................................................................1-20

Motorola GP series Detailed Service Manual

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