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Realistic DX-302 Service Manual

Realistic DX-302
53 pages
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Realistic DX-302 Specifications

General IconGeneral
BrandRealistic
ModelDX-302
CategoryReceiver
LanguageEnglish

Summary

Realistic DX-302 Service Manual

Controls and Functions Overview

Front Panel Controls

Details the function of each control on the front panel of the receiver.

Rear Panel Connectors and Controls

Describes the purpose and connection points of rear panel jacks and terminals.

Technical Specifications

Frequency Coverage and Sensitivity

Lists frequency ranges, sensitivity values for AM, SSB, and CW across various bands.

Principles of Operation

Receiver Architecture Overview

Explains the triple-conversion, double-tuning system, signal path, and key stages like mixers and oscillators.

Block Diagram

AF Operation Check Procedure

2nd/3rd IF Operation Check Procedure

1st IF Operation Check Procedure

1st Local Oscillator Operation Check

2nd Local Frequency Amplifier Operation Check

Total Gain Check Procedure

Preselector Dial Calibration

MHz Switch Linkage Adjustment

3rd IF Alignment Procedure

kHz Tracking Alignment

2nd IF Alignment Procedure

2nd Local Frequency Amplifier Alignment

1st IF Alignment Procedure

VR201 Alignment

1st Local Oscillator Alignment

RF Stage Alignment

Initial RF Alignment (0.15-0.5 MHz)

Adjusts RF stage tuning for optimal signal reception in the 0.15-0.5 MHz band.

RF Alignment (0.5-1.6 MHz)

Adjusts RF stage tuning for optimal signal reception in the 0.5-1.6 MHz band.

RF Alignment (1.6-4.5 MHz)

Adjusts RF stage tuning for optimal signal reception in the 1.6-4.5 MHz band.

BFO Alignment

S-Meter Alignment

Troubleshooting Guide

Wiring Diagram (Top View)

Wiring Diagram (Bottom View)

Electrical Parts List - Capacitors

Coils and Transformers List

Mechanical Parts List

Integrated Circuit Identification

Transistor Lead Identification

Semiconductor Voltage Readings

Schematic Diagram: Digital Frequency Readout

Schematic Diagram

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