Re[elecraft] K2/KPA100 problem

[W3FPR - Don Wilhelm]

Bryan,

I suggest solving the low power output on 15/12/10 for the base K2.  You
should be able to achieve at least 10 watts on all bands.  I don't believe
that is your basic problem with the KPA100.

If the the KPA100 is self-oscillating, that is the first problem to tackle.
Once you get that under control, other apparent problems may also disappear.

I have not had experience with oscillations in the KPA100, so the best
advice I can offer is to check all components and all soldering - it is not
normal for the KPA100 to self-oscillate, in fact in my experience it is
quite stable.  Look carefully at the input circuit components and the
transformer turns.  The LPF is not the most likely culprit.

73,
Don W3FPR

> -----Original Message-----
>
> The K2 appears to work on all bands, albeit only 6 to 8watts out
> on 15/12/15m, which I presume is ok, but maginal.  When I connect
> up my KPA100, output is 100w plus on the lower bands, but on
> 15/12/10 m it is very low, and the system is self-oscilating
> around 100MHz and the frequency is unstable.
>
> I would think that there was a problem in the KPA's LPF for those
> bands, but I can't find anything wrong.  I use Toroidguys
> inductors, and all seems well as far as I can check.
>
> Has anyone had a similar experience I wonder.  Does the low
> output from the K2 cause this problem
>
> Thanks
>
> 73 Bryan  G3AKF
> _______________________________________________
>