The RadioShack / Realistic DX-390 is a popular classic portable radio for shortwave and multi-band reception, produced between 1992 and 1998. It is a rebadged version of the well-known Sangean ATS-818 radio. This radio is known among DXing enthusiasts (hunters of distant waves and frequencies) for its high quality and stability in capturing weak signals. 📻 Basic Technical Specifications Frequency Coverage: Shortwave (SW): Continuous coverage from 1.6 to 30 MHz. Medium Wave (MW/AM): From 520 to 1710 kHz. Long Wave (LW): From 150 to 519 kHz. FM Wave: From 87.5 to 108 MHz (with Stereo support when using headphones). RigPix Database +1 Reception System: PLL Synthesized and Dual Conversion system to reduce noise and improve signal quality. eBay +1 Reception Modes: Supports SSB (Single Sideband) and CW modes thanks to the adjustable BFO control, allowing you to listen to amateur radio, aircraft, and ship communications. Memory: Contains 45 memory channels for storing favorite stations (9 for AM/LW/FM each, and 18 for Shortwave). Power: Operates on 4 D-size batteries for primary operation, 3 AA batteries for memory and clock backup, or via an external 6V AC adapter. RigPix Database +1 👍 Device Features Manual Control: Features a Tuning Knob that supports both fast and slow tuning, along with the ability to directly enter frequencies via the keypad. RF Gain Control: Gives you the ability to attenuate very strong signals to prevent audio distortion. Bandwidth Filter: Option to switch bandwidth between (Wide / Narrow) to improve audio quality or isolate interfering stations. Signal Indicator: Built-in LCD screen displays signal strength, battery status, and dual clock. Common Drawbacks and Tips for Users Sensitivity to Static Electricity: One of the most common drawbacks of this radio family (DX-390 and DX-440) is the susceptibility of the RF FET input transistor to damage from static charges when an external antenna is connected. Enthusiasts always recommend installing Protection Diodes to protect it. Tuning Mute: When rapidly rotating the tuning knob, the radio automatically mutes the audio between frequencies, which annoys some enthusiasts during scanning.