[Elecraft] Making a K2/100 Cleaner

[W3FPR - Don Wilhelm]

Jim,

Gary has a point that I had forgotten about - and yes it can make a
difference on 40 meters too.

Before concluding that this is your problem (although the changes have been
put into new KPA100 kits), take a look at the RF envelope on a 'scope
looking for any evidence of 'modulation' on the CW signal.  It will vary by
band and by the power level - if you see a nice clean RF Envelope, this is
likely not your problem (unless it is too small to observe).

73,
Don W3FPR

> -----Original Message-----
>
> Jim,
> Read the following document, which might help.  There is a spur generated
> on 80 meters in some KPA100's caused by a resonance in the TR switch
> components.  Easily fixed with a 1K resistor soldered across one of the
> inductors.  Won't help 40 meters though.
>
>
> http://www.elecraft.com/manual/E740035E%20KPA100%20errata%20rev%20C-3.pdf
>
> 73
> Gary, N7IR
>