@bradbrownjr got it! Had to change the PTT port to "COM3" (my #IC7300) *not* "CAT". On the rig, "USB SEND" *does* need to be set to "RTS", it can't be "OFF".

Now I can transmit the calibration tones from #SoundModem as well as try to send commands from #EasyTerm and have the radio key up.

Phew. That's enough for today!

#packetRadio #hamRadio