It is a rigctl command to clear SPLIT mode. 

S, set_split_vfo     Set split mode, 0 or 1, and transmit VFO.

S 0 VFOA     turns off split mode and sets transmit VFO to VFO A

So I guess the better question is if you are in split mode, and transmitting 
(VFO B), and the KX3 gets a command to turn off split mode, and go to VFO A, 
what happens?
Does it keep transmitting but now on VFO A frequency ?

Troubleshooting issues with WSJT-X and just trying to understand what is 
happening under the hood.

-Kevin (KK4YEL) 


> On Feb 8, 2016, at 21:04, Don Wilhelm <[email protected]> wrote:
> 
> I do not see the "S 0 VFO" command in the K3/KX3 programmer's reference.
> Is this a command that is being issued to some logging program?
> If so, that may be a condition of the logging program (or a bug).
> 
> 73,
> Don W3FPR
> 
>> On 2/8/2016 8:43 PM, kevino z wrote:
>> I noticed if my KX3 is in split mode, and transmitting, and the command    S 
>> 0 VFOA. Is issued, the power level drops to zero. The very next time the 
>> transmission starts again, the power slowly increases from zero to whatever 
>> wattage I had set for power out. Is this some sort of safety feature?
>> 
>> -Kevin (KK4YEL)
>> 
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