[Elecraft] KPA500 REFL HI fault

[Robert Redmon]

I put my KPA500 on 80 meters for the first time this morning, and it 
faults after several characters. SWR as shown on both the K3 and the 
KPA500 is 1.3:1. I reduced drive to 11w (250w out), and it still does 
it. The first few cw characters, swr looks fine, but if I pause a bit 
and hit the key again, swr jumps above 5:1 and the amp shuts down with a 
"refl hi" fault. If I run the K3 barefoot at 100w, the swr is steady at 
1.3:1 no matter what I do. Anybody know what is going on?

Bob K5SM