Radio Shack Dx-390 Owners Manual !!exclusive!!

Radio Shack DX-390 (catalog number 20-214) is a versatile, high-performance portable world band receiver that covers FM, LW, MW, and SW frequencies. Known for its sensitivity and digital tuning, it remains a favorite for shortwave enthusiasts.

Below is a draft write-up designed for a product description, archive, or enthusiast site. Radio Shack DX-390 World Band Receiver Introduction

The Radio Shack DX-390 is a sophisticated digital communications receiver designed for "DXing"—the hobby of listening to distant radio stations. Manufactured by Sangean (as a rebadge of the ATS-803A), this unit offers a seamless blend of portability and desktop-level features, making it ideal for both home use and travel. Key Features Broad Frequency Coverage

: Full coverage of the AM broadcast band, FM stereo (via headphones), Longwave (LW), and continuous Shortwave (SW) from 1.6 to 30 MHz. Dual Power Options

: Operates on six 'D' cell batteries for portable use or an AC adapter for stationary listening. Advanced Tuning Modes : Features four ways to find stations: Direct keypad entry of the frequency. Manual rotary tuning knob. Auto-scan searching. Memory recall (stores up to 18 presets). SSB (Single Side Band) Reception

: Includes a BFO (Beat Frequency Oscillator) control, allowing users to listen to amateur radio operators (hams), maritime signals, and aeronautical communications. Integrated Clock & Timer

: A built-in digital clock with dual time zones and a programmable sleep timer/alarm, perfect for catching international broadcasts at specific UTC times. Quick Start Guide

: Slide the power switch to the 'On' position. Ensure fresh batteries are installed or the 9V DC adapter is connected. Selecting a Band : Press the buttons to select your desired broadcast range.

: Use the keypad to type in a known frequency (e.g., 6.020 for a SW station) and press , or use the large tuning knob to scan the bands manually. Improving Reception radio shack dx-390 owners manual

: For SW and FM, fully extend the telescoping whip antenna. For AM and LW, rotate the radio to utilize the internal ferrite bar antenna.

: To hear amateur radio, press the SSB button and slowly adjust the knob until the voice becomes clear and natural. Maintenance Tips Battery Care

: Always remove batteries if the radio will be stored for more than two weeks to prevent acid leakage. Antenna Safety

: Do not use the telescoping antenna near overhead power lines.

: Use a soft, dry cloth to clean the exterior. Avoid harsh chemicals or solvents that could damage the display or plastic casing. or a list of common SW frequency bands to this manual draft?

Display Icons

• MEMO – Memory mode active
• PAGE (0–9) – Current memory page
• CH (0–9) – Current memory channel
• BEEP – Beep enabled
• Clock icon – Time display mode
• Signal bars (5 levels) – Signal strength meter
• PM – Afternoon (12-hour clock)

Cleaning the Tuning Capacitor (If scratchy tuning)

• Remove back cover, locate variable capacitor (silver, near antenna).
• Use compressed air, then tiny drop of DeoxIT F100 on shaft bearings – not on plates.

Power Options

• Batteries: 4 × AA (UM-3) alkaline or NiMH.
  Battery life: ~15-20 hours alkaline, 8-12 hours NiMH.
• AC Adapter: 6V DC, center negative (e.g., RadioShack 273-1664 or universal adapter set to 6V, negative tip).
  Warning: Using center-positive will damage the radio.
• DC Input: Rear panel 3.5mm DC jack.

3. Basic Operation

Tape Recorder Jack (side)

• 3.5mm stereo jack – fixed-level audio out (approx 100 mV).
• Use for recording or feeding signal to SDR / PC sound card.

4. Common Issues & Fixes (From Manual)

• No sound / low volume – Check headphone jack (it disables speaker); clean with contact cleaner.
• Display dim – Replace internal backup battery (CR2032).
• Band not switching – Dirty band switch; gently work switch back/forth 20+ times.

Finding a physical copy is rare, but several digital archives provide both the User (Owner's) Manual and the Service Manual:

ICanWorkThisThing.com: Provides a direct HTML/text version of the owner's manual covering all basic features and setup.

ManualsLib: Hosts a 62-page service manual that includes detailed schematic diagrams and internal alignment instructions. Radio Shack DX-390 (catalog number 20-214) is a

Archive.org: Offers combined service manuals for the DX-390 and its Sangean counterpart.

QSL.net: Features a simplified web-based guide for operations like clock setting and memory storage. Quick Operation Guide

The manual details several key procedures for getting the most out of this 1990s-era receiver: dx390.htm - QSL.net

The Radio Shack DX-390 (released around 1992) is a rebadged Sangean ATS-818, famously known for its "Voice of the World" tagline and its rugged, hefty build . Beyond the standard technical specs found in the owner's manual

, the radio has developed a cult following for its modifiability and specific vintage quirks. radiojayallen Essential "Hidden" Hardware Facts Dual Battery Requirement:

A common point of confusion not always emphasized is that it requires 7 batteries total

: 3 AA cells strictly for the clock and memory backup, and 4 D cells to power the main radio functions. The RF Gain Quirk:

A unique behavior of the DX-390 is that the RF Gain control only works on shortwave (SW) when using the built-in whip antenna. However, if you plug in an external antenna, the control suddenly works for both SW and AM. External Antenna Jack: MEMO – Memory mode active PAGE (0–9) –

The 1/8” mini-jack for SW/AM is highly recommended because it completely disconnects the internal antennas, reducing interference—a feature rare for portables of that era. Popular Modifications (Beyond the Manual)

The DX-390 is often criticized for "muting" while tuning (a brief silence between frequency steps). Enthusiasts frequently perform these "easy" community-sourced modifications: Disable Muting: By snipping or disconnecting the green wire at Pin #10 of the CNT 1 connector

on the main board, you can enable smooth, continuous tuning without the annoying silence between stations. Sensitivity Boost:

Removing a specific surface-mount resistor (labeled "102") near the ferrite rod antenna on the PCB can dramatically enhance LW/MW sensitivity. Static Protection:

Because the front-end FET is sensitive to static zaps from the whip antenna, many owners wire back-to-back diodes from the antenna pad to the negative battery terminal for protection. RadioReference.com Forums Quick Start: Setting the Dual Time Clock

One of the best features is the ability to track local time and UTC (Universal Coordinated Time) simultaneously: Use the numeric keypad to enter the time in 24-hour format Toggle between the two zones using the

button to instantly see the world time for shortwave broadcasts. Troubleshooting Common Issues Erratic Tuning:

If the tuning knob skips or won't tune "up," it is usually due to dirt in the electrical encoder. This can often be fixed by opening the back and flushing the encoder with 91% isopropyl alcohol while rotating it. "Deaf" Radio:

If the radio stops picking up signals, the front-end FET may have been "zapped" by static electricity. This requires a relatively simple transistor replacement on the PCB. Locked Display: