Motorola HT Series Service Manual page 8

iv
Chapter 4 UHF Band 1 Theory of Operation .....................................4-1
4.1 Transmitter.................................................................................................................... 4-1
4.1.1 General ............................................................................................................ 4-1
4.1.2 Power Amplifier................................................................................................ 4-1
4.1.3 Antenna Switch................................................................................................ 4-2
4.1.4 Harmonic Filter ................................................................................................ 4-2
4.1.5 Antenna Matching Network.............................................................................. 4-2
4.1.6 Power Control Integrated Circuit (PCIC).......................................................... 4-2
4.2 Receiver........................................................................................................................ 4-3
4.2.1 Receiver Front-End.......................................................................................... 4-3
4.2.2 Receiver Back-End .......................................................................................... 4-4
4.3 Frequency Generation Circuitry.................................................................................... 4-4
4.4 Synthesizer ................................................................................................................... 4-5
4.5 Voltage-Controlled Oscillator (VCO)............................................................................. 4-6
Chapter 5 UHF Band 2 Theory of Operation .....................................5-1
5.1 Transmitter.................................................................................................................... 5-1
5.1.1 General ............................................................................................................ 5-1
5.1.2 Power Amplifier................................................................................................ 5-1
5.1.3 Antenna Switch................................................................................................ 5-2
5.1.4 Harmonic Filter ................................................................................................ 5-2
5.1.5 Antenna Matching Network.............................................................................. 5-2
5.1.6 Power Control Integrated Circuit (PCIC).......................................................... 5-2
5.2 Receiver........................................................................................................................ 5-3
5.2.1 Receiver Front-End.......................................................................................... 5-3
5.2.2 Receiver Back-End .......................................................................................... 5-3
5.3 Frequency Generation Circuitry.................................................................................... 5-4
5.4 Synthesizer ................................................................................................................... 5-5
5.5 Voltage-Controlled Oscillator (VCO)............................................................................. 5-6
Chapter 6 VHF Theory of Operation...................................................6-1
6.1 Transmitter.................................................................................................................... 6-1
6.1.1 General ............................................................................................................ 6-1
6.1.2 Power Amplifier................................................................................................ 6-1
6.1.3 Antenna Switch................................................................................................ 6-2
6.1.4 Harmonic Filter ................................................................................................ 6-2
6.1.5 Antenna Matching Network.............................................................................. 6-2
6.1.6 Power Control Integrated Circuit (PCIC).......................................................... 6-2
6.2 Receiver (for all models except those with PCB 8486473Z04) .................................... 6-3
6.2.1 Receiver Front-End.......................................................................................... 6-3
6.2.2 Receiver Back-End .......................................................................................... 6-4
6.2.3 Automatic Gain Control Circuit ........................................................................ 6-4
6.3 Receiver (for models with PCB 8486473Z04) .............................................................. 6-5
6.3.1 Receiver Front-End.......................................................................................... 6-6
6.3.2 Receiver Back-End .......................................................................................... 6-6
Table of Contents