I’ve used a Realistic DX 440 portable radio ever since I started DXing almost 20 years ago. I now have over 100 NASWA shortwave broadcast countries verified–all with the portable, long nights and lots of patience. 
It’s been a great little radio — even after our house got struck by lightning (of course one should always use protection LOL).
If you use one of these radios, congratulations on your good taste!
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Picture of my shack DX-440 is on the right.
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Discussion Group DX-440 ATS-803A Email Discussion Group! Also has many files, including a copy of the DX-440 service manual.
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Rick’s DX-440 Mods from the king of the mods. {archived at web archive}
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Modern Shortwave Receiver Survey ATS-803A rating, from DXing.com.
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Reviews Summary for Sangean 803A/Radio Shack DX 440 at eHam.net.
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SANGEAN ATS-803A RADIOSHACK DX-440 page with lots of pictures and info at RadioInel.com.
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Reviews Summary for Sangean 803A/Radio Shack DX 440 at eHam.net.
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Modification — ATS803A Anti-chuffing Mod.
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DX 440 Usenet search via Google.
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ATS 803A Usenet search via Google.
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DX-440 AM/FM Direct Entry Communications Receiver Specifications Circuits, jacks, power, selectivity, output, etc.
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DX-440 AM/FM Direct Entry Communications Receiver Preparation How to set it up — power requirements, etc.
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DX-440 AM/FM Direct Entry Communications Receiver Operation Part 1 Setting the alarm, how to tune it, making a wire antenna, etc.
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DX-440 AM/FM Direct Entry Communications Receiver Operation Part 2 Basics of the shortwave listening hobby.
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DX-440 AM/FM Direct Entry Communications Receiver Troubleshooting Common problems.
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DX-440 AM/FM Direct Entry Communications Receiver Care and Maintenance From Tandy.
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DX-440 AM/FM Direct Entry Communications Receiver Detailed Parts List With corresponding Radio Shack part numbers.
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803a here is a photo of a Sangean ATS-803A.
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Equipment Field Test Report Sangean ATS-803A Vs. 1958 Zenith Trans-Oceanic.
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Sangean ATS-803a / DX-440 FAQ The frequently asked questions file for this radio. The FAQ contains the following sections:
- Operating The Set
- Batteries (and related flaky behavior)
- Power Supplies
- Front-end Overload
- Antennas
- Antennas and Static Zapping
- Other Static Damage
- Mod to Remedy Whine Problem
- Mod to Remedy Chuffing While Scanning
- Mod to Add Fine-tuning
- Other Modifications to the Set
- Cassette Out Plug (DIN)
- Frequencies: Alignment and Increasing Range
Thanks to Steve Higgins, who was the original host of the FAQ.