On 12/12/2018 4:44 PM, Jack Brindle via Elecraft wrote:
Noting that the current is double for 110V, the heat losses in the power line
will actually be quadrupled.
If you have #12 wire in your walls (the current NEC code), and use the supplied
power cord, things should be just fine.
That can depend on how long the run is from the power panel to the
outlet. For CQP and 7QP expeditions, we run KPA500s on 120V, and have
had issues with under-voltage faults caused by too much IR drop combined
with regulation issues with the generator.
At home, I run my KPA500 on 240V, because I had 240 brought to the shack
before I moved in. Since the power supply is unregulated, an advantage
of running on 240V is slightly less voltage drop when the radio is keyed.
BTW, IR drop and the associated power lost in wiring feeding electronic
loads is significantly greater than predicted by Ohm's law for a sine
wave because the current drawn by power supplies is not a sine wave --
current is drawn at the peaks of each half of the AC cycle to recharge
the input filter capacitor.
73, Jim K9YC
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