13 May 2020

(slow) 19.5Bd/97Hz FSK, likely a Russian-Mil network

19.5Bd/97Hz (slow) FSK waveform spotted on 5331.0 KHz followed by opchat in Morse:
"RGJV de PZSF QSY 17542 K"


Source is probably some Russian-Mil network. Transmission consists of a repeated 126-bit sequence (Figs. 1,2).

Fig. 1
Fig. 2
 Interesting: a time shift of half bit is added after each sequence most likely for synch purposes (Fig. 3)

Fig. 3
A similar signal, except the 125 Hz shift, was also noted by my friend Cryptomaster:


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