30 June 2021

unid FSK/MFSK SELCAL

6907.0 KHz (cf): unid SELCAL waveform spotted on 6907.0 KHz (cf),. The waveform consists of 40Bd/240 FSK idling part  followed by MFSK-36 40Bd/40 (likely the Id of called station).

Fig. 1
 
Fig. 2

https://disk.yandex.com/d/XlHhceBC9fLlvQ

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