@Karl Are you able to use WSJT-X with your current setup correctly? If yes, which settings do you have in WSJT-X for Rig and COM port? I am using the KX2 with exactly the same settings for WSJT-X and JS8CALL without a problem. JS8CALL can control the KX2 (e.g. set the correct data mode, set the frequency etc. vy 73, Michael (DG3NAB)