mercoledì 6 dicembre 2017


Russian diplomatic station heard some weeks ago on HF.

Fsk modulation with a symbol rate of 100 Bd and 500 Hz shift.

The bitstream after demod shows a typical 7-bit structure (5 bit + 1 bit START and 1 STOP bit).

By removing the start and end bits, we obtain sequences of 10 groups of 5 letters each as shown in the figure.

Fsk transmission followed by op chat in morse code.

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