[Elecraft] [KX3] TX Power Issue

[Gary Hawkins]

I'm seeing a odd problem working digital today with my KX3. Sometimes 
when I go into transmit (power set at 5W) JT65_HF, my Signalink shows 
PTT active (red light) , the KX3 shows PTT active (red light) but no 
power is being radiated.  Antenna (dipole) has a near perfect match to 
the KX3.  Power still shows set to 5W on KX3. Problem remains if I 
switch from the antenna to a dummy load.  Osc and PA temp at 36 and 30C 
- PSU stable at 13.4V.  When I try to transmit is DATA A mode (tune) 
power seems to try to ramp up and then immediately falls away.  Radio 
seems to transmit fine in FM mode.  What am I missing please?