[Elecraft] K2/HF Packer Amp incompatability?

[zendoc at netspace.net.au]

Hi Pat and group,

FWIW,  I have just built an HF Packer Amp and have exactly the same problem with
marked audio distortion on SSB when driving it with my FT 817nd. Maybe the
problem isn't the K2?

I have discovered others with the same problem, but no-one with a solution to
this Amp's non-linear behaviour on SSB.  I was waiting to finish building my K2
to try the amp with the K2, but I suspect now that the problem is with Amp.  I
initially thought it was RF feedback and that the mic cord was the likely
culprit.  But no amount of wrapping any of the connector cables through ferrite
toroids has has any influence.  Audio is distorted on peaks in SSB and only when
the Amp is on and running into an antenna.  Distortion is much less running the
Amp into a dummy load and absent running the amp in bypass. Reducing the input
power makes no difference to the audio quality.  I've tried running the Amp and
the rig from separate power supplies and/or gel cells :  makes no discernable
difference. I've never had any trouble with RF feedback before, running 600W
from my AL 811 into the same antenna system.

If you find any clues to a solution, please let me know.  Glad I bought the
KPA100 for my K2!

73,

John
VK7JB


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