[Elecraft] WSJT-X Problem with K3S

[Joe Subich, W4TV]

> 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.

The physical RTS line is moved from the computer to the output of
the USB UART (in the K3).  However, there is still a physical RTS
line.  The set RTS/DTR/Break and clear RTS/DTR/Break commands are
much more robust than sending serial data via USB.

Using RTS is *always* more robust (and less susceptible to RFI)
that using CAT commands for TS?RX switching.

73,

    ... Joe, W4TV


On 1/12/2017 1:15 PM, Nicklas Johnson wrote:
> 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 <lists at 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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