[Elecraft] SSB and WSJT

[Ross]

I use my K3 as a "driver" using the transverter output to drive my 1296 Transverter for EME.
I have a problem, I will try to explain in full.

On WSJT I use a Navigator interface to  the LINE IN to operate the K3 and the PTT is controlled by the Navigator on Com 4, and
the K3 operates perfectly.  MIC SEL is set to LINE IN, and MIC + LINE NOT APPL.
Everything perfect, good signals.
Set up as it is, I can "ping" the moon to check my echo, by pushing the XMIT button, with the K3 in USB and then see my echo on the 
computer software a couple of seconds later.


The problem comes when I try to operate SSB on EME, (and CW).
I have set VOX off, MIC SEL to FPL and Bias is on, (for the Heil headset),
Pushing the XMIT button to start transmitting, then start talking, I can see the audio being transmitted, and the Bird Wattmeter on the amp output
showing the voice output
BUT then after a few seconds the amp goes to full output, just as if I had pushed the XMIT button in the desciption above..

Ideas please, The XMIT is also the TUNE button is it possible the K3 is going into TUNE mode, that could explain the 
amp going to full power.

I need to sort this problem before I start on CW.

Best wishes
Ross
ZL1WN