21 May 2016

Unid FSK 300Bd/850

This FSK signal has been heard on 6699.0 KHz (cf), manipulation speed is 300 symbols/sec (quite unusual) and the shift between tones is ~850 Hz (pics. 1,2)

pic. 1
pic. 2
The transfer is continuous and data are encrypted but since I tuned it after its initial phase, I did not found any particular sequence in the demodulated bistream. However friends from radioscanner.ru that spotted a whole transmission say it contains KG-84 identifier in the initial part of the trasmission: this signal is reported here
The signal has a characteristic "batman-like" spectrum that exhibits 955Hz bandwidth (pic. 3)

pic. 3

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