Realistic trc-448 - User Manual

40 - CHANNEL
MOBILE TRANSCEIVER
Catalog Number: 21-1561
.0
00
CUSTOM MANUFACTURED FOR RADIO SHACK A DIVISION OF TANDY CORPORATION
REALISTIC
■

Summary

Specifications

Public Address Specifications

Specifications related to the Public Address (PA) mode of operation.

General Specifications

Provides general operating parameters, frequency range, and physical dimensions.

Block Diagram

Principles of Operation

PLL Circuit Operation

Details the Phase Lock Loop circuit for frequency synthesis and channel selection.

Automatic Modulation Control Circuit

Describes the circuit that regulates audio modulation depth for consistent transmission.

Automatic Limiter Control and Gain Control

Explains ALC for transmitter output power and AGC for receiver signal strength.

Noise Blanker

Disassembly

Alignment Preparation

Alignment Positions and Points

PLL Section Alignment Chart

VCO Output Frequency, IC-2 Input Frequency and Code Table

Transmitter Section Alignment Chart

Receiver Section Alignment Chart

Alignment Connections

Band Pass Filter Alignment

Shows how to connect test equipment for band pass filter adjustments.

Transmitting Section Alignment Setup

Details instrument setup for general transmitter alignment tasks.

Balanced Modulator Alignment

Transmitting Section Alignment (SSB)

Receiver Section Alignment

Noise Blanker Alignment Chart

PLL P.C. Board (Top View)

PLL P.C. Board (Bottom View)

Main P.C. Board (Top View)

Main P.C. Board (Bottom View)

Wiring Diagram (1)

Wiring Diagram (2)

LED P.C. Board (Top View)

LED P.C. Board (Bottom View)

LED P.C. Board; Channel Switch P.C. Board Wiring Diagram

Troubleshooting

PLL Section Troubleshooting

Troubleshooting guide for issues related to the Phase Lock Loop circuit.

Other Sections Troubleshooting

Troubleshooting guide for common faults in other functional sections.

Revision Information

Exploded View

Schematic Diagram

Semiconductor Lead Identification

IC Pin Configurations

SL1626 C Schematic Diagram

SL1626 C Lead Identification

REC86345 Schematic Diagram

REC86345 Lead Identification

Realistic trc-448 Specifications

General

Brand	Realistic
Model	trc-448
Category	Transceiver
Language	English