Unless I'm mistaken, doesn't the K3S connect directly via USB though?  If
the problem is happening because of common mode on the USB cable, there is
no physical RTS line involved like there would be in an old-style COM/RS232
device- there is only serial data going across a USB cable to a logical COM
device inside the K3S.  It most likely wouldn't change anything in this
case.

   Nick

On 12 January 2017 at 10:08, Joe Subich, W4TV <li...@subich.com> wrote:

>
> 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
>
>
>
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*N6OL*
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