https://github.com/hzeller/txtempus (A DCF77, WWVB, JJY and MSF clock LF-band signal transmitter using the Raspberry Pi)
ios and mac app: https://forum.audiob.us/discussion/49109/pips-a-radio-time-s...
(time sync over rf is super cool; I would be super interested if anyone has links to field surveys of time signal availability, potential gaps in coverage, and maps of said data.
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...
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...
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.