I'm just curios is there any real test data available showing what IMD
may be present at various supply voltages? I have heard many comments
on the reflector over the years saying to keep the voltage high one
member saying to keep it at 15V. The specs say 13.8 V nominal during
TX. (11 V min, 15 V max) I would think that the transmit signal
should be fairly clean within this range.
At home its on a regulated supply 13.8 so NP but at the cottage where
there is no utility power its on a battery with 6 and 10ga wiring all
using solar charge. At night I will see voltages drop to about 12V
after operating with lighting from the same battery for a while usually
about 1:00 am in a contest. this is when I go off the air and to bed,
as this is typically about when the battery reaches a 40-50% charge and
I don't like to go below this. is operating approaching 12 volts
(transmit) really an issue?
David Moes
President: Peterborough Amateur Radio Club.
dm...@nexicom.net
VE3DVY, VE3SD
On 12/22/2014 11:31, Jim Brown wrote:
On Mon,12/22/2014 7:05 AM, Greg Troxel wrote:
Jim Brown <j...@audiosystemsgroup.com> 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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