16 April 2021

CIS Navy FSK 50Bd/250 (T-600)

50Bd/250 FSK is another waveform used by CIS Navy for their fleet broadcast. Unlike the same waveform but with 136-bit framing (T-600 136), this one shows all the characteristics of the (perhaps more) well known 50Bd /200 broadcast, ie:

* 44 initial 42 bit initial sequence (usually  "100001010010111110000101001101011010101101")
* 70-bit Initialization Vector (ten 7-bit words, repeated twice)
* payload arranged in the 4:3 ratio
* 7-bit words "000100" as EOM



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