These days I found a digimode waveform I’ve never met before
Seems to be a MFSK with 4 tones, 100Bd, 850Hz shift
I suppose the AF offset is +1500Hz but that’s just a guess, as there were no carrier or TX noise visible, the signal was very weak.
Freqs logged so far: 8243.0 USB & 5765.0 USB
Signal not copied on many RX remotes, no idea from where it’s from..