Motorola EP450 Service Manual page 6

Table of Contents
Module 2: UHF 403-440, 438-470, 465-495 MHz
Chapter 7 403-440 MHz UHF Theory Of Operation ............................ 7-1
7.1 Introduction .................................................................................................................................... 7-1
7.2 UHF Receiver ................................................................................................................................ 7-1
7.2.1 Receiver Front End ........................................................................................................... 7-1
7.2.2 Receiver Back End ........................................................................................................... 7-2
7.3 UHF Transmitter ............................................................................................................................ 7-3
7.3.1 Transmitter Power Amplifier ............................................................................................. 7-3
7.3.2 Antenna Switch ................................................................................................................. 7-3
7.3.3 Harmonic Filter ................................................................................................................. 7-3
7.3.4 Antenna Matching Network............................................................................................... 7-4
7.3.5 Power Control ................................................................................................................... 7-4
7.4 UHF Frequency Generation Circuitry ............................................................................................ 7-4
7.4.1 Fractional-N Synthesizer .................................................................................................. 7-5
7.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 7-6
7.5 Keypad........................................................................................................................................... 7-7
Chapter 8 438-470 MHz UHF Theory Of Operation ............................ 8-1
8.1 Introduction .................................................................................................................................... 8-1
8.2 UHF Receiver ................................................................................................................................ 8-1
8.2.1 Receiver Front End ........................................................................................................... 8-1
8.2.2 Receiver Back End ........................................................................................................... 8-2
8.3 UHF Transmitter ............................................................................................................................ 8-3
8.3.1 Transmitter Power Amplifier ............................................................................................. 8-3
8.3.2 Antenna Switch ................................................................................................................. 8-3
8.3.3 Harmonic Filter ................................................................................................................. 8-3
8.3.4 Antenna Matching Network............................................................................................... 8-4
8.3.5 Power Control ................................................................................................................... 8-4
8.4 UHF Frequency Generation Circuitry ............................................................................................ 8-4
8.4.1 Fractional-N Synthesizer .................................................................................................. 8-5
8.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 8-6
8.5 Keypad........................................................................................................................................... 8-7
Chapter 9 465-495 MHz UHF Theory Of Operation ............................ 9-1
9.1 Introduction .................................................................................................................................... 9-1
9.2 UHF Receiver ................................................................................................................................ 9-1
9.2.1 Receiver Front End ........................................................................................................... 9-1
9.2.2 Receiver Back End ........................................................................................................... 9-2
9.3 UHF Transmitter ............................................................................................................................ 9-3
9.3.1 Transmitter Power Amplifier ............................................................................................. 9-3
9.3.2 Antenna Switch ................................................................................................................. 9-3
9.3.3 Harmonic Filter ................................................................................................................. 9-3
9.3.4 Antenna Matching Network............................................................................................... 9-4
9.3.5 Power Control ................................................................................................................... 9-4
9.4 UHF Frequency Generation Circuitry ............................................................................................ 9-4
9.4.1 Fractional-N Synthesizer .................................................................................................. 9-5
9.4.2 Voltage Controlled Oscillator (VCO) ................................................................................. 9-6
9.5 Keypad........................................................................................................................................... 9-7
HKLN4216A
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November 24, 2003