Radio Shack DX 275 User Manual

Radio Shack DX 375
Shortwave Radio
User Manual

Radio Shack DX 275 Specifications

General

Type	Portable Receiver
Frequency Range (FM)	88 - 108 MHz
Speaker	Built-in
Headphone Jack	Yes
Frequency Range	88-108 MHz
Modes	AM
Antenna	Telescopic, Ferrite bar
Frequency Range (AM)	530-1710 kHz

Summary

Features

Phase-Locked Loop (PLL) Synthesized Receiver

Ensures accurate tuning via PLL technology for stable reception.

Large, Fast-Response Display

Provides clear visibility of band, frequency, battery status, and indicators.

Memory Tuning

Allows storage of up to 30 favorite frequencies per band for quick access.

Direct-Access Tuning

Enables tuning directly to a specific frequency by keypad entry.

Search Tuning

Automatically scans for the next available station up or down the band.

Memory Scan

Sequentially scans through stored frequencies in memory.

LED Tuning Indicator

Visual confirmation light when a signal is successfully tuned.

Shortwave Quick Select

Provides rapid access to the 12 international shortwave bands.

Key Lock

Protects against accidental changes to receiver controls.

Sleep Timer

Automatically turns off the receiver after a set period (60 minutes).

DX/Local Control

Adjusts reception sensitivity to reduce distortion from strong signals.

Headphone Jack

Allows private listening and stereo FM reception via headphones.

Three Power Options

Supports power via internal batteries, AC adapter, or DC adapter.

Tone Control

Allows adjustment of audio frequency response for clarity.

Memory Backup

Retains programmed stations for up to one hour without battery power.

Frequency Step Switch

Configures tuning increments for different country standards.

Folding Stand

Provides stable positioning and better viewing angle for the receiver.

Locking the Controls

Locking Controls Function

Prevents accidental operation of controls by locking them.

Using the Sleep Timer

Sleep Timer Operation

Sets the receiver to automatically power off after a set duration.

Using the Sensitivity Switch

Sensitivity Switch Usage

Optimizes reception for strong (Local) or distant (DX) signals.

Installation

Power Sources Overview

Explains the three methods to power the receiver: batteries, AC, or DC.

Internal Battery Power

Instructions for installing and replacing two C alkaline batteries.

Battery Installation Steps

Step-by-step guide to safely install batteries, including warnings.

Setting the AM/FM Tuning Increment

Configures frequency increments for US/Canada or other countries.

Using Stereo Headphones

Connects headphones for private listening and stereo FM.

Listening Safely

Provides guidelines to prevent hearing damage from high volume levels.

Using the Folding Stand

Details how to use the built-in stand for stability and viewing.

Alternate Power Sources

Standard AC Power

Connects the receiver to an AC outlet using an optional adapter.

Vehicle Battery Power

Powers the receiver using a vehicle's 12V power outlet.

Standard AC Power Steps

Step-by-step instructions for connecting the AC adapter.

Vehicle Battery Power Steps

Step-by-step instructions for connecting the DC adapter to a vehicle.

Operation

Listening to the Receiver

Basic steps to turn on, select bands, tune stations, and adjust volume.

Selecting the Band

How to switch between FM, AM, and the 12 Shortwave bands.

Tuning to a Radio Station

Methods for finding and tuning to broadcast stations.

Manual Tuning

Adjusts frequency by pressing UP/DOWN buttons.

Search Tuning

Automatically scans for the next strong station by holding UP/DOWN.

Direct Access Tuning

Tunes directly to a frequency by entering numbers via keypad.

Preset Tuning

Recalls stations stored in memory using preset number buttons.

Scan Tuning

Scans through stored memory locations, stopping briefly at each.

Storing Station Frequencies

Instructions for saving favorite station frequencies into memory.

Storing a Frequency in Memory

Step-by-step guide to saving a tuned station's frequency.

Using the Antenna

Guidelines for adjusting the telescoping antenna for optimal reception.

Listening Hints

International Radio Frequencies

Lists international broadcast bands and their frequency ranges.

Frequency Conversion

Explains how to convert between kHz, MHz, and wavelength (meters).

Time Standard Frequencies

Lists stations broadcasting accurate time signals and their frequencies.

Care and Maintenance

General Care

Tips for keeping the receiver dry, clean, and away from dust.

Battery Care

Instructions for using fresh batteries and removing old ones.

Modifying Components

Warning against modifying internal components; voiding warranty.

Troubleshooting

No display, or incorrect display

Troubleshooting steps for display issues, usually related to batteries or adapter.

No sound

Steps to resolve no sound issues, checking volume, headphones, and connections.

No power from batteries

Troubleshooting steps when the receiver does not power on using batteries.

Specifications

GENERAL

Overall specifications including output impedance, power, and test conditions.

AM BAND

Detailed performance specifications for the AM broadcast band.

SW1 BAND

Detailed performance specifications for the SW1 broadcast band (2.3-6.25 MHz).

SW2 Band

Detailed performance specifications for the SW2 broadcast band (7.1-21.85 MHz).

FM BAND

Detailed performance specifications for the FM broadcast band.

STEREO

Specifications related to stereo reception and audio output.

DX-375 AM/SW/FM/ST RCV Parts List

Parts List

Comprehensive list of internal components and their part numbers for service.

Electronic Components

Details specific ICs, switches, connectors, and other electronic parts.

Mechanical Components

Lists mechanical parts like speakers, cabinets, panels, and knobs.