"The inverted L loads just fine to about 700 watts and then causes the Alpha
amp to fault out. I think I am getting a sudden change in antenna impedance.
The antenna is fed through a 5 KW rated choke balun. The feed line exits the
base between radials."
Remove the balun. It's not doing anything for your and is a potential source
of loss and problems. Coaxial cable is unbalanced, as is a ground-fed inverted
L. No need for a balun.
Check all your connections - make sure they're tight and well soldered or
clamped. You're pushing a lot of RF current through them and a marginal
connection will generate much heat and expand.
-Jeff
W0ODS
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Topband reflector - topband@contesting.com
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