OFDM 16-tone 75 Bd, 110 Hz (MS 188-110A App.A modified?)
Publicado: 29 Jun 2015 23:48
hola,
I had this signal via Twente SDR on USB 14301.8 (cf) on 28/06/15 (1710z) just in the 20 mt band, reserved to HAM traffic.
The waveform is an OFDM 16-tone PSK, 75 Bd and 110 Hz shift, sent in burst mode. It is very similar to the obsoleted Standard NATO MIL 188-110A Appendix A without the doppler tone @ 605 Hz and in not-continuous mode.
There is a Chinese variant of the MIL 188-110A 16 channels: it could be this case, but I could not find info or logs about it. The burst mode could lead to something like a selcall waveform.
Signal can be downloaded from here
Saludos cordiales!
I had this signal via Twente SDR on USB 14301.8 (cf) on 28/06/15 (1710z) just in the 20 mt band, reserved to HAM traffic.
The waveform is an OFDM 16-tone PSK, 75 Bd and 110 Hz shift, sent in burst mode. It is very similar to the obsoleted Standard NATO MIL 188-110A Appendix A without the doppler tone @ 605 Hz and in not-continuous mode.
There is a Chinese variant of the MIL 188-110A 16 channels: it could be this case, but I could not find info or logs about it. The burst mode could lead to something like a selcall waveform.
Signal can be downloaded from here
Saludos cordiales!