Thanks for those references! I wanted to see what an SDR radio time signal detector would look like, and looking for "DCF77 sdr python" pointed me in the right direction -> [0] and [1]

A bit unrelated question: there are many web SDRs that let you listen to radio frequencies/stations such as [2]. Are there web / Emscripten SDR decoders that run in-browser? i.e. a full browser listening + decoding experience? For example, decoding a DCF77 time signal, or even just morse code?

[0] https://www.nist.gov/time-distribution/radio-station-wwv/wwv...

[1] https://github.com/henningM1r/gr_DCF77_Receiver/tree/main/py...

[2] http://websdr.ewi.utwente.nl:8901/

Amazing, exactly what I was looking for! I've had luck on http://carinthia.proxy.kiwisdr.com:8073/ (the link you posted seems busy right now)

I was able to use the FSK decoder, it worked really well. For those curious, the C-based decoder extensions are here [0]

[0] https://github.com/jks-prv/Beagle_SDR_GPS/tree/master/extens...

Android app https://play.google.com/store/apps/details?id=jp.houryo.dcf7...

I run this for my Citizen Skymaster on a picoPi. It works. Being within receiving distance of JJY in Yokohama IETF, and in Frankfurt near the german transmitter was wonderful, but I have an NTP synced dummy at home with a copper loop antenna and it works fine.

Using the HDMI lead interferes with the rPi GPIO signal being used to supermodulate the RF. As long as you don't drive the HDMI, its fine. I think its possible HDMI is an RF radiator.

The java/javascript trick with headphones works too.