2) AFSK is being regularly produced by WSJT-X through the computer sound card, then I guess that there is a sort of "software muting" of this signal which is blocked in some way to feed the rear data connector of my YAESU FT-100 which in turn doesn't transmit any RF. May be if I would attach the AFSK output directly to the radio mic plug, then the RF transmission would be possible.
Hi Marco, This a wild guess as I have no access to YAESU FT-100, but in some rigs you need to select Mode Data/Pkt not USB in order to get audio via the rear data connector. 73, Reino OH3mA
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