Motorola PR860 Detailed Service Manual page 7

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2.7 UHF1 Voltage Control Oscillator (VCO) ..................................................................... 2-10
2.8 UHF2 Transmitter ....................................................................................................... 2-11
2.8.1 Power Amplifier (PA) ..................................................................................... 2-12
2.8.2 Antenna Switch.............................................................................................. 2-12
2.8.3 Harmonic Filter .............................................................................................. 2-12
2.8.4 Antenna Matching Network............................................................................ 2-12
2.8.5 Power Control Integrated Circuit (PCIC)........................................................ 2-12
2.9 UHF2 Receiver ........................................................................................................... 2-13
2.9.1 Receiver Front-End........................................................................................ 2-13
2.9.2 Receiver Back-End ........................................................................................ 2-14
2.9.3 Frequency Generation Circuit........................................................................ 2-14
2.10 UHF2 Synthesizer....................................................................................................... 2-15
2.11 UHF2 Voltage Controlled Oscillator (VCO)................................................................. 2-17
2.12 VHF Transmitter ......................................................................................................... 2-19
2.12.1 Power Amplifier.............................................................................................. 2-19
2.12.2 Antenna Switch.............................................................................................. 2-19
2.12.3 Harmonic Filter .............................................................................................. 2-20
2.12.4 Antenna Matching Network............................................................................ 2-20
2.12.5 Power Control Integrated Circuit (PCIC)........................................................ 2-20
2.13 VHF Receiver ............................................................................................................. 2-21
2.13.1 Receiver Front-End........................................................................................ 2-21
2.13.2 Receiver Back-End ........................................................................................ 2-22
2.13.3 Automatic Gain Control (AGC) ...................................................................... 2-22
2.13.4 Frequency Generation Circuit........................................................................ 2-23
2.14 VHF Synthesizer......................................................................................................... 2-23
2.15 Voltage Control Oscillator (VCO)................................................................................ 2-25
2.16 Low Band Transmitter................................................................................................. 2-27
2.16.1 Power Amplifier (PA) ..................................................................................... 2-27
2.16.2 Antenna Switch.............................................................................................. 2-28
2.16.3 Harmonic Filter .............................................................................................. 2-28
2.16.4 Antenna Matching Transformer ..................................................................... 2-28
2.16.5 Power Control Integrated Circuit (PCIC)........................................................ 2-28
2.16.6 Temperature Cut Back Circuit ....................................................................... 2-28
2.16.7 Electrostatic Discharge (ESD) Protection Circuit........................................... 2-28
2.17 Low Band Receiver..................................................................................................... 2-28
2.17.1 Receiver Front-End........................................................................................ 2-29
2.17.2 Receiver Back-End ........................................................................................ 2-30
2.17.3 Automatic Gain Control (AGC) ...................................................................... 2-30
2.17.4 Frequency Generation Circuit........................................................................ 2-30
2.18 Synthesizer ................................................................................................................. 2-31
2.19 Voltage Control Oscillators (VCO) .............................................................................. 2-32
2.19.1 Receive VCO ................................................................................................. 2-32
2.19.2 Transmit VCO ................................................................................................ 2-32
2.19.3 Buffer ............................................................................................................. 2-32
2.19.4 Diplexer/Output Filters ................................................................................... 2-33
2.19.5 Prescalar Feedback....................................................................................... 2-33
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