Adding new decoder

[andyrs]

Hi Jon et al,

a couple of days ago Polish government fired up a regular transmission of digital time signal named e-CzasPL (e-TimePL). From what I gather frames are kinda similar to DCF77 and carrier phase modulation is used (I guess?). Maybe you could look into this and implement it in your RadioClock plugin?
Signal is brodcasted at 225 kHz on PR Jedynka programme. I could provide baseband signal recordings, and also work as beta tester if you decide to try it out.
Here are some screenshots of waveforms i capture today

1. over a minute dPhi capture shows some slots, at ~2s mark is 'half-minute-slot' in real time

20231226_150159.png (31.89 KiB) Viewed 19145 times

^this may contain other frames not with time signal, as I just now learned that other data are also transmitted on this frequency

2. this what looks like a full minute frame - the _proper signal_ I think

20231226_150122.png (10.5 KiB) Viewed 19145 times

Frame documentation is unfortunetaly in polish language only, so... maybe could be translated online somehow, if not I could try to do it myself. Link: https://docs.google.com/document/d/1DqA ... M-cIQ/edit

Cheers!

[srcejon]

Have added to the list here: https://github.com/f4exb/sdrangel/issues/1596

[andyrs]

Hi again

Found the frame documentation for e-CzasPL in english:

PCSK-225 - Distribution of official time on long waves.pdf

(240.02 KiB) Downloaded 592 times

Here is a couple of minutes recording of the 225 kHz signal
https://fastupload.io/4d9f52cc78a3f0b8

Also, i've seen on Github, that NBU (66.666 kHz) was considered some time ago... Any decision you made? I could also record signal/betatest that as well.

Cheers!