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Icom IC-251A Manuals
Manuals and User Guides for Icom IC-251A. We have
1
Icom IC-251A manual available for free PDF download: Instruction Manual
Icom IC-251A Instruction Manual (45 pages)
Brand:
Icom
| Category:
Transceiver
| Size: 1.85 MB
Table of Contents
Table of Contents
2
Specifications
3
Product Description
6
Installation
7
Unpacking
7
Power Supply for AC Operation
7
Antenna
8
External Speaker
8
Power Supply for DC Operation
8
Headphones
9
Microphone
9
CW Key
9
Ground
9
Control Functions
10
Front Panel Facilities
10
Rear Panel Facilities
14
Controls under Access Cover
16
Operation
18
How to Tune
18
Preset Frequencies
18
Frequency Display on each Mode
18
Tuning Control
19
Dial Lock Switch
20
TS (Tuning Speed) Button
20
VFO Select Switch
20
Memory Channel Operation
23
RIT - Receive Incremental Tuning
23
Memory-Write - Programming the Memory Channels
23
Memory Reading
23
Scanning Operation
24
Memory Scan
24
Programmed Scan "A"
24
Programmed Scan "B"
25
SSB Operation
26
Receiving
26
NB - Noise Blanker
26
AGC - Automatic Gain Control
26
CW Operation
27
Transmitting
27
How to Use the VOX Circuit
27
FM Operation
28
CW Monitor
28
Semi-Break-In Operation
28
Repeater Operation
29
VSWR Reading
29
For Satellite Communication Use
30
Frequency Chart
30
Inside View
31
Main PC Board Side View
31
PLL Unit Side View
32
Troubleshooting
33
Voltage Charts
36
Main Unit Transistors
36
Main Unit IC in Transmit Mode
37
Main Unit IC in Receive Mode
38
PLL Unit Transistors
38
PLL Unit IC
38
Driver Unit Transistors
39
R Output Timing Chart
40
Block Diagram
41
Options
42
AC Power Supply Unit
43
PI Unit
43
SW Reg - Switching Regulator Unit
43
Power Supply Unit Block Diagram
43
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