Table Of Contents - Icom IC-25A Instruction Manual

Table of Contents

Table Of Contents2
Specifications3
Description4
Installation5
Unpacking5
Location5
Mounting Bracket Installation5
Power Requirements6
Angle Adjustment6
Optional Installation6
Antenna7
Microphone7
External Speaker7
Control Functions8
Front Panel Facilities8
Rear Panel Facilities10
Under The Top Cover11
Vfo/Memory Channel Switch And Vfo Switch12
Operation12
How To Tune12
Preset Frequencies12
Transfering Vfo Frequency13
Duplex (Repeater) Operation13
Resetting The Offset Frequency14
Memory Channel Operation15
Memory-Write - Programming The Memory Channels15
Memory Reading15
Scanning Operation/Memory Scan15
Programmed Scan16
Vfo Full Range Scan17
Resuming Scan17
Priority Function18
Receiving19
Transmitting20
Inside View21
Main Unit Side View21
Pll Unit Side View21
Circuit Description22
Receiver Circuits22
Antenna Switching Circuit22
Rf Circuit22
If Circuit23
Audio Circuit23
Squelch Circuit23
Transmitter Circuits24
16.9Mhz Oscillator, Modulation Circuits24
Audio Frequency Circuit24
Af/Modulation Circuit24
Mixer Circuit25
Driver Circuit25
Power Amplifier Circuit25
Alc Circuit/Metering Circuit25
Pll (Phase Locked Loop) Unit26
Power Supply Circuit/Local Oscillator Circuit26
Mixer, Low Pass Filter And Amplifier Circuit26
Programmable Divider Circuit26
Reference Frequency Generator Circuit27
Phase Detector And Loop Filter Circuit27
Buffer Amplifier Circuit27
Vco Unit27
Driver Unit28
Clock Pulse Generate Circuit28
Scan And Mic Up/Down Control Circuit28
Cpu Control Circuit29
Frequency Control, Display And I/O Circuit32
Driver Circuit Chart32
Troubleshooting33
Block Diagram35