I second Carl's explanation.

I run WSJT-X on my K3s in rig split mode exclusively.   It works
transparently and flawlessly.


On Mon, Dec 4, 2017 at 5:02 PM, Carl Clawson <clawso...@gmail.com> wrote:

> Hi Dany. This scared me a little bit too until I figured out what it was
> for.
>
> This is not just for expeditions. It's for everyone to use whose rig can
> handle it.
>
> Your TX frequency will still be as indicated on the FT8 screen. The
> software will raise the audio tone frequency by the same amount that it
> drops your VFO B so that your tone is in the right place. By doing this,
> the audio tone frequency is kept high enough that its harmonics will be out
> of your FT8 passband. This is good -- it helps keep the band clean.
>
> See section 4.2 in the wsjt-x user guide.
>
> 73, Carl WS7L
>
>
> On Mon, Dec 4, 2017 at 3:59 PM, Dany VE2EBK <ve2...@hotmail.com> wrote:
>
> > Hi
> >
> > I would like to know if someone tried to run WSJT-X FT-8  in Split mode,
> > not Split in the audio band but in real Split by activating the option in
> > the radio tab of the configuration?
> >
> > Here, when I activate Split option, K3 change for Split, RX stay on VFO
> A,
> > TX change to VFO B but TX frequency drop of 1 kHZ !  If I turn the VFO B
> > (TX) 3 kHz up for example, the VFO B return 1 KHz down when a
> transmission
> > start (TUNE is enough).
> >
> > This option seems to have been for the DX station rather than for use.
> >
> > It would be nice to check this before the 3Y0Z DXpedition  that during
> ...
> >
> > 73
> >
> > Dany VE2EBK
> >
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