the
signal shows an OFDM part followed by the usual Serdolik MFSK-34: this is one of the several variants of the Russian system SERDOLIK.
As the 35-tone OFDM mode, this variant shows a 40-samples lenght for LG, 35 tones and spreads a about 3000 Hz bandwidth.
This mode has an easily distinguishable pilot tone at the lower channel so the used channels count to 60 and they are PSK-4 manipulated at 40 Hz (aggregate speed 2400 bps). Separation among channels is 50 Hz, since the presence of CP. The other parameters of the correlation triangle are Br-40, Sh-50 and 'magic K' = 1/4.
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