On 1/12/2017 11:05 AM, John Stengrevics wrote: > What’s the solution, ferrites on the USB cable? Stop using CAT Commands for PTT! Instead set CONFIG:PTT-Key to RTS-OFF and use RTS. WSJT-X supports PTT Method = RTS by setting the PTT Port the same as the CAT Port. 73, ... Joe, W4TV