Motorola EP450 Service Manual page 172

INDEX
UHF 465-495 MHz Theory Of Operation.............................................................................9-1
Introduction....................................................................................................................9-1
UHF Receiver................................................................................................................9-1
Receiver Front End..................................................................................................9-1
Receiver Back End ..................................................................................................9-2
UHF Transmitter ............................................................................................................9-3
Transmitter Power Amplifier ....................................................................................9-3
Antenna Switch........................................................................................................9-3
Harmonic Filter ........................................................................................................9-3
Antenna Matching Network .....................................................................................9-4
Power Control..........................................................................................................9-4
UHF Frequency Generation Circuitry ............................................................................9-4
Fractional-N Synthesizer .........................................................................................9-5
Voltage Controlled Oscillator (VCO) ........................................................................9-6
Keypad ..........................................................................................................................9-7
UHF Schematic Diagrams, Overlays, and Parts Lists ...................................................... 11-1
Introduction.................................................................................................................. 11-1
Notes For All Schematics and Circuit Boards........................................................ 11-1
Six Layer Circuit Board.......................................................................................... 11-3
Speaker and Microphone Schematic .......................................................................... 11-3
Speaker and Microphone Parts List ...................................................................... 11-3
UHF Troubleshooting Tables.............................................................................................10-1
Troubleshooting Table for Receiver.............................................................................10-1
Troubleshooting Table for Synthesizer ........................................................................10-3
Troubleshooting Table for Transmitter .........................................................................10-4
Troubleshooting Table for Board and IC Signals .........................................................10-6
V
VHF 146-174 MHz Keypad Board Parts List.....................................................................6-22
VHF 146-174 MHz Radio Parts List ..................................................................................6-19
VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists ..................................6-1
VHF 146-174 MHz Theory Of Operation.............................................................................4-1
VHF 146-174 MHz Troubleshooting Tables ........................................................................5-1
VHF Receiver, VHF 146-174 MHz Theory Of Operation.....................................................4-1
VHF Transmitter, VHF 146-174 MHz Theory Of Operation.................................................4-3
VHF 146-1 74 MHz Keypad Board Parts List....................................................................6-22
VHF 146-1 74 MHz Radio Parts List .................................................................................6-19
VHF 146-174 MHz Schematic Diagrams, Overlays, and Parts Lists ..................................6-1
Introduction....................................................................................................................6-1
Notes For All Schematics and Circuit Boards..........................................................6-1
Six Layer Circuit Board............................................................................................6-3
Speaker and Microphone Schematic ............................................................................6-3
Speaker and Microphone Parts List ........................................................................6-3
VHF 146-174 MHz Theory Of Operation.............................................................................4-1
Introduction....................................................................................................................4-1
VHF Receiver ................................................................................................................4-1
Receiver Front-End .................................................................................................4-1
Receiver Back-End..................................................................................................4-2
HKLN4216A
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November 24, 2003