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Icom IC-281H Service Manual

Icom IC-281H
42 pages
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Icom IC-281H Specifications

General IconGeneral
Frequency Range144-148 MHz
ModesFM
Dimensions6.1 x 7.5 x 2.5 inches
Weight2.9 lbs
Supply voltage13.8 VDC
TypeMobile

Summary

Safety and Repair Precautions

General Safety Precautions

Critical safety warnings regarding voltage, environment, power supply, and RF signal limits.

Specifications Overview

General Specifications

Key operational parameters including frequency coverage, power requirements, dimensions, and weight.

Transmitter Specifications

Technical details of the transmitter, including output power levels, modulation, and frequency deviation.

Receiver Specifications

Technical details of the receiver, including sensitivity and intermediate frequencies.

Circuit Description and Allocation

Receiver Circuitry

Detailed explanation of the receiver's signal path, including filters, amplifiers, and mixers.

Transmitter Circuitry

Detailed explanation of the transmitter's signal path, including modulation and power amplification.

Adjustment Procedures

Receiver Adjustment

Procedures for adjusting receiver sensitivity and the S-meter for optimal performance.

Transmitter Adjustment

Procedures for adjusting transmitter output power and frequency deviation.

Optional Units

Block Diagram

Voltage Diagrams

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