I use one of my 100 watt radios in our travel trailer. I did run three
lengths of #10 AWG automotive primary cable from the battery area to my
operating position. Both the DC negative and DC positive lines each
have a 30A Fast Blow fuse located very close to the battery. That third
wire is a separate wire from the trailer ground, which is also near the
battery to my operating position. This ground connects to the ground
terminal on the radio. I do not rely on DC Negative for ground.
Otherwise, there is an equal DC drop on the Positive wire and the same
also on the Negative wire, thus the radio is above ground by that
amount. Usually about 0.25 to 0.5 volts, depending on current.
The inverter supplying DC and charging the battery, which is normally
associated with the trailer, does/did produce some hash. Several donuts
with 5 to 8 turns of wire located in the inverter box greatly reduced
the hash. These were installed on the AC primary side of the inverter
and the DC output of the inverter to the battery. This took replacing
some wires to get the added and needed lengths to add the ferrite
filters. I used RTV Silicone to hold each these in place thus
preventing them moving when the trailer is in tow. All is quiet now.
As to the Honda generator, the EI 2000 does produce some hash. I just
operate off of battery and don't operate when the Honda is running.
While I haven't tried it, Jim, K9YC has good suggestions for filtering
the AC line coming from the Honda. In studying the topic, I would opt
for putting the filter inside the Honda, if there is room. Otherwise,
locate it as close to the Honda output as possible.
73 Bob, K4TAX
On 7/31/2015 11:35 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. 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.
73, Al ve7ear
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