I can't get the WSJT-X CAT control to work with either my K3 or FT817, either. Setting the PTT to VOX is the easiest way, set RADIO to NONE. Setting the PTT to RTS will also work if you set PTT to RTS in the K3 menu, also with RADIO set to NONE. I don't know why this works, but it does. I tried everything I could think of to get CAT control to work without success. If you get it working please let us know how. As Don said, setting the audio correctly on transmit is critically important. 73 Eric WD6DBM
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