A year or so ago I embarked on a project to determine the efficiency and
the "sweet spot" operating parameters of my KPA500. I drive my KPA500
with my Elecraft K3S.
Armed with a good 50 ohm dummy load, two watt meters {one on the input
and one on the output}, and my EXCEL spreadsheet, I meas
Robert,
It is possible that the fault is brief enough to register in the fault
table, but not turn off the amp.
The 65 to 85 volt range is to be determined with the amplifier turned
on, but not keyed and certainly not running at 500 watts.
Do as the manual indicates and measure you AC Mains
My KPA500 was purchased new in July 2017. Use regular 120V outlet.
I run the red transformer tap to keep my transmit HV above 60 at full 500
output.
The yellow tap did not provide sufficient voltage on transmit. Thus the
red.
I have a whole-house surge protector just outside my main breaker box.
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