28 September 2018

unid FSK 1200Bd/1200 test transmissions

Unid long-run (crtical) FSK 1200Bd/1200 test transmission heard on 13720.0 (cf) around 1320z (26 Sep). The demodulated stream consists of 16-bit frames, each frame consisting of:
*) seven bits coded with ASCII-7  ([A-Z] letters, [0-9] numbers and special chars)
*) 4-bit coded numbers [0-9]
*) 5-bit coded numbers patterns
Notice the sharp filtering at the edge of FSK transitions.


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