22 July 2016

CIS Navy FSK 50Bd 40Hz

quite unusual FSK signal heard on 12592.5 KHz and by my friend KarapuZ on 14581.0 KHz on USB: such shift (40 Hz) is rare on these high frequencies. ACF not measurable (=0). Thanks to KarapuZ for sending me the record.

As suggested by cryptomaster, these transmissions have characteristic SOM and EOM; the transfer is performed using a code 4/3 four "1" and three "0".

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