I remember this problem from the early days of the KPA100, although not
necessarily in connection with the KAT100. I believe there was a
builder's alert issued about the RF choke location, but I was unable to
find it on the Elecraft Web site.
If the KPA100 is old enough that it does not have the side grounding
clips and reconfigured shield, there is a modification kit at
<http://www.elecraft.com/order_form_parts.htm> called KPA100SHLDKT.
This change was included in KPA100's shipped after June 2003, according
to the parts list description. The reconfigured shield has a smaller
gap near the SO239 and the RF choke which I believe was intended to fix
this problem.
Although I don't recall exactly, I think the suggestion in the original
Builder's Alert was to mount the RF choke away from the hole in the
shield and as close to the chassis as possible.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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