v
Table of Contents
Product Safety and RF Exposure Compliance...........................................iii
Chapter 1 Introduction.............................................................................. 1-1
1.1 Scope of Manual............................................................................................................................ 1-1
1.2 Warranty and Service Support....................................................................................................... 1-1
1.2.1 Warranty Period................................................................................................................ 1-1
1.2.2 Return Instructions............................................................................................................ 1-1
1.2.3 After Warranty Period ....................................................................................................... 1-1
1.3 Related Documents ....................................................................................................................... 1-2
1.4 Technical Support.......................................................................................................................... 1-2
1.4.1 Piece Parts Availability ..................................................................................................... 1-2
1.5 Radio Model Chart and Specifications........................................................................................... 1-3
1.6 Radio Model Information................................................................................................................ 1-3
Chapter 2 Theory of Operation ................................................................ 2-1
2.1 Introduction .................................................................................................................................... 2-1
2.2 Radio Power Distribution ............................................................................................................... 2-1
2.3 Keypad........................................................................................................................................... 2-2
2.4.2 Real Time Clock (RTC)..................................................................................................... 2-4
2.4.3 Circuit Description............................................................................................................. 2-4
2.4.4 ModB/Vstby Supply ..........................................................................................................2-5
2.5 VHF Transmitter ............................................................................................................................ 2-5
2.5.2 Antenna Switch................................................................................................................. 2-6
2.5.3 Harmonic Filter ................................................................................................................. 2-6
2.5.4 Antenna Matching Network............................................................................................... 2-6
2.5.5 Power Control Integrated Circuit (PCIC)........................................................................... 2-6
2.5.6 VHF Receiver ................................................................................................................... 2-7
2.5.7 Receiver Front-End........................................................................................................... 2-7
2.5.8 Receiver Back-End ........................................................................................................... 2-8
2.5.9 Automatic Gain Control Circuit ......................................................................................... 2-8
2.5.10 Frequency Generation Circuitry........................................................................................ 2-9
2.5.11 Synthesizer ..................................................................................................................... 2-10
2.5.12 Voltage Controlled Oscillator (VCO) ............................................................................... 2-11
2.6 UHF Transmitter (Band 1 and Band 2) ........................................................................................ 2-12
2.6.1 Power Amplifier............................................................................................................... 2-13
2.6.2 Antenna Switch............................................................................................................... 2-13
2.6.3 Harmonic Filter ............................................................................................................... 2-13
2.6.4 Antenna Matching Network............................................................................................. 2-13
2.6.5 Power Control Integrated Circuit (PCIC)......................................................................... 2-13
2.6.6 UHF Receiver (Band 1 and Band 2) ............................................................................... 2-14
2.6.7 Receiver Front-End.........................................................................................................2-14
2.6.8 Receiver Back-End ......................................................................................................... 2-15
2.6.9 Automatic Gain Control Circuit ....................................................................................... 2-15
2.6.10 Frequency Generation Circuitry...................................................................................... 2-16
2.6.11 Synthesizer ..................................................................................................................... 2-16
2.6.12 Voltage Controlled Oscillator - (VCO) ............................................................................. 2-18