On Mon,12/22/2014 7:05 AM, Greg Troxel wrote:
Jim Brown <[email protected]> writes:
I run a contesting station with two K3s driving power amps with a 10A
supply keeping the battery charged during the winter, and solar panels
doing it during the summer.
What do you do about the voltage being 12.5ish instead of 13.8? Run the
K3s at reduced power (because of the amps you are doing anyway)? Don't
worry about extra IMD? Use a DC-DC converter to get 13.8V?
Most of my contesting is done either at legal limit, with the K3s
driving an amp or at QRP. For NAQP, of course, i run 100W. Even at 100W
and 12.5V the K3 is pretty clean, and at the 40-50W level it takes to
drive my Ten Tec Titans, even cleaner. The measurements in the link
below were taken with my usual power setup.
k9yc.com/P3_SpectrumMeasurements.pdf
Someone mentioned using a solar charge controller. I'm using a GV MPPT
charge controller between my solar panels and the battery. It's RF
quiet. Most charge controllers make RF noise. GV makes several models
for different battery types, voltages, and current ratings. They are
available here. The company also seems to be a good place to buy Li
batteries.
http://www.batteryspace.com/140w-10a-solar-charge-controller-with-mppt-for-lithium-batteries.aspx
73, Jim K9YC
73, Jim K9YC
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