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IC-25H
Icom IC-25H Manuals
Manuals and User Guides for Icom IC-25H. We have
1
Icom IC-25H manual available for free PDF download: Instruction Manual
Icom IC-25H Instruction Manual (37 pages)
144 MHz FM Transceiver
Brand:
Icom
| Category:
Transceiver
| Size: 3.59 MB
Table of Contents
Table of Contents
2
Specifications
3
Description
4
Multi-Purpose Scanning
4
Dual Vfo's
4
Outstanding Performance
4
Installation
5
Unpacking
5
Location
5
Power Requirements
6
Antenna
7
Microphone
7
Control Functions
8
Front Panel
8
Rear Panel
9
Under the Top Cover
11
Operation
12
How to Tune
12
Preset Frequencies
12
Tuning Control
12
Transferring VFO Frequency
13
Duplex (Repeater) Operation
13
Resetting the Offset Frequency
14
Memory Channel Operation
15
Scanning Operation
15
Memory-Write
15
Memory Reading
15
Programmed Scan
16
VFO Full Range Scan
17
Resuming Scan
17
Priority Function
18
Receiving
19
Transmitting
20
Inside Views
21
Main Unit Side
21
PLL Unit Side
21
Circuit Description
22
Outline
22
Receiver Circuits
22
Antenna Switching Circuit
22
IF Circuit
23
Audio Circuit
23
Squelch Circuit
23
Transmitter Circuits
24
Oscillator, Modulation Circuits
24
Audio Frequency Circuit
24
Mixer Circuit
25
Driver Circuit
25
Power Amplifier Circuit
25
ALC Circuit
25
PLL Unit
26
Power Supply Circuit
26
Local Oscillator Circuit
26
Mixer, Low-Pass Filter
26
Reference Frequency Generator Circuit
27
Phase Detector and Loop Filter Circuit
27
Buffer Amplifier Circuit
27
VCO Unit
27
Driver Unit
28
Clock Pulse Generate Circuit
28
Scan and MIC Up/Down Control Circuit
28
CPU Control Circuit
29
Frequently Control, Display and I/O Circuit
32
Troubleshooting
33
Block Diagram
35
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