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From: James Meyer
Subject: Re: How to get quiet AM radio reception with an inverter nearby ?
X-Newsreader: Forte Agent 1.92/32.572
Date: Sat, 23 Nov 2002 00:31:46 GMT
NNTP-Posting-Date: Fri, 22 Nov 2002 19:31:46 EST
On Fri, 22 Nov 2002 22:44:55 GMT, "Ray" wroth:
>I have a cabin partway into the mountains.
> I use a car radio powered by 12v battery for quite good AM radio reception,
> except for when I turn on my generator or inverter for lights etc.
>Then the buzz and static completely overwhelms the stations.
> I tried setting up the radio far away from my power wiring, so that at the
> I get clean sound. But when I extend the speaker leads back into the
> the buzz again feeds back into the radio.
>Any idea's how to help this ? I assume that because I am in an
>elecrically quiet location
>the radio is able to run with AGC wide open, but this allows full
>amplification of the buzz.
>Is there any way to block the interference from feeding back into the
>speaker wires to re-enter the radio front end ?
Shielding and filtering at the source, the generator, is the best
solution. It won't be easy or cheap.
You could build an enclosure for the generator out of copper window
screen material and then pass the AC from the generator out of the enclosure
through what is known as an "RFI" filter. RFI stands for "radio frequency
Do a Google web search for "RFI filter" and then pick one with a current
rating to match the generator's output. Buy some lumber and screen material.
The enclosure needs to be complete with all four sides, a top, and a floor. It
doesn't have to be much bigger than the generator plus enough room to walk
around inside. You'll need a door and that will be the hardest part. The door
needs to close so that it makes contact all around with the wall opening you put
The RFI filter will most likely be a metal box with contacts on one end
for the generator and on the other end for the rest of the wiring to connect to.
The box should be mounted half way through the screen and connected to it all
the way around.
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