On Fri,7/31/2015 9:35 AM, Al Sather wrote:
Greetings
I know this is a bit of topic but I this this list has the expertise
to give me good answers.
My station is a KX3-KXPA100 with a PX3. I have a quiet, to me, 30 amp
switching power and a 2000 watt Honda generator that generates some,
but not objectionable noise.
Great generator, lots of them in our club. There's a fix for the noise.
http://nccc.cc/pdf/CQP-RFI2013-2.pdf addresses this and a lot of other
noise sources.
The NB on the KX3 clears that up totally. I also have a 20 amp liner
Astron power supply but it is heavy, bulky for use in a small trailer.
And, it may be light for running an amp.
I course I do not need to run it at 100 watts, either.
I am trying to decide if it best to operate from the trailer's AC or
directly from the batteries.
And, if I use the batteries alone are there precautions I need to take.
Of course, if available I would use "shore power". The AC from the
trailer seems to be adequate when running with or without "shore
power" or with my generator.
I guess my real concern is the issue of using DC directly, and what
should happen for protecton between my batteries and station.
Since 2004, I've been running all my gear on big 12V deep discharge
batteries that I "float charge" with a regulated supply set for about 14
VDC.
I've never found the need for any protection in line with the gear. We
do the same on FD, except that we use solar panels to charge the battery.
One thing I have run into with a K3 running from the 12V system in my
2006 Toyota Sequoia (big SUV). I was operating 6M with the motor off,
and decided to start it. That somehow interrupted power to the K3 for a
few seconds, which caused a microprocessor to lose its place. To get it
going, I had to remove it from the 12V line and let it sit for a while
(10-15 minutes).
The K3 doesn't like its power to be interrupted. The root cause of the
problem is that when you turn a K3 off using the front panel, it writes
its current operating conditions to RAM. When you interrupt power with
the K3 running, it can't do that.
I don't know how this might relate to the KX3.
73, Jim K9YC
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