New possible Russian Digimode

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New possible Russian Digimode
Frequencies 10.225 MHz,10.24 MHz
Frequency Range 10.225 MHz - 10.24 MHz
Mode USB
Modulation Unknown (Digital)
Bandwidth 15 kHz
Location Worldwide
Short Description The signal is believed to be a new russian communication mode/modem. I found this signal with my SdrplayRsp2Pro and a 15m (50ft) longwire antenna with 1:9 Unun. The signal was also heard on the Websdr in the Netherlands so it was not local.
I/Q Raw Recording
Audio Sample

Far from new. This is a decades old Russian 150Bd/4000Hz 4-tone MFSKMultiple Frequency Shift-Keying signal, 12 kHzKiloHertz (kHz) 10^3 Hz wide in total (not 15 kHzKiloHertz (kHz) 10^3 Hz). It can be heard almost daily, most easily on Eastern European receivers in daytime around 4-7 MHzMegaHertz (MHz) 10^6 Hz, but it's also often heard up to 18-20 MHzMegaHertz (MHz) 10^6 Hz.