[Elecraft] KPA100 "New Shield" & still getting RF

[Vic Rosenthal]

George Winship wrote:

<snip>

 > If I am trying to tune an
 > antenna that has a significant mismatch (eg. tuning an 80m ant on
 > 40), any output cw or SSB 11watts or higher will cause complete shut
 > down of the radio and power supply. This occurs with the KAT100 in
 > AUTO or BYPASS mode.

<snip>

 > There seems to no problem on 40 if the
 > KPA100 is turned off. There is also no problem if I tune into my 50
 > ohm dummy load.

Try disconnecting the VRFDET line in the cable to the KAT100.  Wayne has 
said that this line is not necessary when the KPA100 is installed in the 
  K2 case, and possibly there is some kind of feedback or ground loop 
effect that's causing the problem.

Vic K2VCO