На всякий случай описание предетчика Риккардо:
Hi Markus, LF
Thanks for your autodecoder!
Here it's my usual SDR H-mixer based, with quadrature generator resetted every 1PPS pulse of GPS (to avoid phase errors due to unwanted glitch on the clock signal).
An Ublox NEO-M8T module generates both 1PPS (TP1) and 540 kHz clock (TP2), so my SDR LO is 135kHz (÷4) at this moment.
A Spectrum Lab session with PLL configuration locks the audio phase (a 2522 Hz tone, quadrature I/Q out) with 1PPS signal.
Finally, the BPSK on the RF (encoded by ebnaut-tx for Win program) is made by a diode ring modulator before the PA driver.
All the best
73 de Riccardo IW4DXW