domenica 22 ottobre 2017

Chinese 4+4 parallel tone modem

I heard the signal two days ago on 16820 Khz.





300 Hz typical between the tones and 450 Hz between the two 4-tones groups.


Interleaved in time and frequency tones 4+7, 3+6, 2+5, 1+8

Symbol rate: 75 Bd for each tone.






Modulation: pi/4 DQPSK 

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