[Elecraft] K3 144XV QUESTION

[Chad Wasinger]

Richard - I've experienced the same issue with the K144xv internal transverter boards on at least three K3's. I run a similar setup with a Tokyo Hy Power 350 amplifier and PowerMaster watt meter. In SSB, my amp and the meter show an SWR over 2.5 to 1 and it then it drops to normal when modulation starts. It is very weird and specific to the k144xv as my Yaesu 817nd works fine with normal readings. Sometimes it will actually trick my amp into thinking the SWR is too high and it goes into standby. A quick analyzer put on the feedline confirms that SWR is fine.  
The only solution I've ran across and that has worked is replacing the k144xv with a new one. Did this several months ago on my second K3/10 and the problem did disappeared. Elecraft said there was some sort of oscillation going on with the faulty k144xv and that the new one work correct it. 
Hope this helps. 
> From: kissov at me.com
> Date: Sat, 6 Apr 2013 09:24:30 -0700
> To: elecraft at mailman.qth.net
> Subject: [Elecraft] K3 144XV QUESTION
> 
> The setup is K3/144XV, TE Systems 4W in 200W out amp Elecraft W2  directional coupler, bias T ( for 12v to PRE), 9913 up mast to SSB pre amp to M2 12 element 2meter beam. When I test the SWR with the W2 it is vanishingly low on FM and CW, on modulated SSB its over 2.5 to 1.  When I replace the K3/144XV with a Yaesu FT736R the SWR is way low in all modes.  Why is the SWR so high from the K3 in SSB mode only? and how can I fix it? Thank you, cannot figure it out.
> 
> P.S. it is the same with the 12V bias T removed 
> 
> R Thorpe K6CG
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