HFU HF Underground
Technical Topics => SDR - Software Defined Radio => Topic started by: hashrocket on November 12, 2026, 2357 UTC
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Hi all,
I've built a free, open-source web app called skywave (https://www.skywavehf.com) for listening through public KiwiSDR receivers in the browser.
For listeners:
- Pick best chooses the receiver with the best SNR for your frequency, and falls back to the next one if it's full.
- A receiver map with the day/night terminator drawn live, so you can pick receivers on the night side.
- Strong signals now: a quick scan of MW and the SW broadcast bands on the receiver you're using, listing the loudest signals with EiBi station names. Click to tune.
- EiBi names on the dial and waterfall, AM/USB/LSB/CW, a waterfall you can widen to a whole band, and shareable links to an exact receiver and frequency.
For Kiwi owners reading this, since skywave runs on your receivers:
- Each skywave listener takes one channel, and skywave never puts more than one listener on the same Kiwi at a time. Sessions end after an hour.
- It shows up in your user list as `skywavehf.com`.
- If you've set non-Kiwi-app connections to 0, skywave leaves your receiver alone.
- It uses raw I/Q with the demodulation done on skywave's server, so it uses more of your upload than a normal listener: roughly 0.4–0.65 Mbit/s.
- Details, and how to opt out: https://www.skywavehf.com/owners
Code is at https://github.com/thehashrocket/skywave. Feedback very welcome, especially from owners.
73,
Jason