On 5/31/2025 11:33 AM, Bob McGraw wrote:
However, should the amp be powered from residential electrical outlets
where there are usually 4 or 5 on the same circuit and using the stab-in
connections, the 120V voltage drop may be excessive under full load.
The amp should not display the HV to be less than 60 volts at 500 watts
output.
Bob's advice is right on! It's simple Ohm's law to run beefy copper for
circuits that will run big loads. My shack is wired with two #10
120V/20A circuits and a single 240V/20A circuit.
The KPA500 HV transformer is tapped to adjust for these issues. It's
quite simple to adjust -- open the top cover and change a push-on
jumper, per the manual. For almost ten years, we've run two KPA500s from
one or two Honda 2000i or 2200i generators. For CW, we need to back off
the power to 300-350W to run from a single gen, but can run full power
from two of the generators sychronized together with the Honda kit.
If one of the stations is SSB, we can run close to full power from one
generator. They're running on 120VAC. We DO run beefy copper from the
generator(s) to the amps.
73, Jim K9YC
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