Find out who made the charger, regardless of how old it is.

Then, if that company is still in business, contact them to see if 
they offer any modifications, including a new charger, that will solve 
the problem.

If that fails, I think there is an HF mobile list either on Yahoo 
Groups or QTH.net. While you are probably like me and need another 
email list like I need another hole in my head, someone on that list 
may have a suggestion that will work.

You could also see if there is a reflector for your specific brand of 
motor home, or for RV's in general. Since there are still people out 
there who listen to the radio, somebody on those lists may also be 
able to help.



----- Original Message ----- 
From: "Tom Behler" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 14, 2012 6:53 PM
Subject: Getting rid of hash caused by battery charging unit in RV


Hi, all.

I know we have discussed similar topics before, but I have an issue in 
my RV
that is now affecting my HF set-up big-time.

Specifically, there is a built-in charging unit for the house battery 
that
seems to be creating more and more interference on the HF frequencies. 
The
interference occurs when the charger is in either the "use" or "store" 
mode.
I know that the charger is causing the interference, since when I 
switch
from "use" to "store
", the interference goes away for a few minutes, until the charger 
re-sets
itself, after which time, it gradually returns.

When we unplug the RV from the electrical service at our camp site, 
the
interference disappears completely.

As far as I know, since the charger is directly wired into the RV, 
there is
no way to turn it completely off.

Does anyone have any simple remedies for me to try in order to get rid 
of,
or at least lessen this interference.  It is so bad that it makes the
40-meter band unusable, which is why I was not on Saturday's round 
table.
20 meters isn't much better either, which is rather discouraging.

73 from Tom Behler: KB8TYJ