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IC-251A
Instruction manual
Icom IC-251A Instruction Manual
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Instruction manual
(44 pages)
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Specifications
Product Description
Installation
Unpacking
Power Supply for AC Operation
Antenna
External Speaker
Power Supply for DC Operation
Headphones
Microphone
CW Key
Ground
Control Functions
Front Panel Facilities
Rear Panel Facilities
Controls under Access Cover
Operation
How to Tune
Preset Frequencies
Frequency Display on each Mode
Tuning Control
Dial Lock Switch
TS (Tuning Speed) Button
VFO Select Switch
Memory Channel Operation
RIT - Receive Incremental Tuning
Memory-Write - Programming the Memory Channels
Memory Reading
Scanning Operation
Memory Scan
Programmed Scan "A"
Programmed Scan "B"
SSB Operation
Receiving
NB - Noise Blanker
AGC - Automatic Gain Control
CW Operation
Transmitting
How to Use the VOX Circuit
FM Operation
CW Monitor
Semi-Break-In Operation
Repeater Operation
VSWR Reading
For Satellite Communication Use
Frequency Chart
Inside View
Main PC Board Side View
PLL Unit Side View
Troubleshooting
Voltage Charts
Main Unit Transistors
Main Unit IC in Transmit Mode
Main Unit IC in Receive Mode
PLL Unit Transistors
PLL Unit IC
Driver Unit Transistors
R Output Timing Chart
Block Diagram
Options
AC Power Supply Unit
PI Unit
SW Reg - Switching Regulator Unit
Power Supply Unit Block Diagram
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Specifications
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Power Supply for Ac Operation
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