Gary:

Please keep me posted on what you find out, since this could be my ultimate 
solution.

If you want to take this off list, just use:

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73 from Tom Behler: KB8TYJ

----- Original Message ----- 
From: "Gary Tillinghast" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, May 14, 2012 11:30 PM
Subject: Re: Getting rid of hash caused by battery charging unit in RV


> Hi Tom
> Our camper has the same problem.  I like to listen to AM radio while in 
> bed,
> (old radio shows).  I took this issue to a local ham who is an engineer. 
> He
> said that these charging/ inverters are a non-filtered power supply.  He
> stated that a noise cap will not suppress the noise.  He suggested in 
> taking
> the 12 volt side of the inverter and changing it to a switchable power
> supply of about 33 amps.  Keeping the voltage to around 13.5 volts.  After 
> I
> thought about this, I asked if the charging system of the towing vehicle
> might affect the power supply by backfeeding the new switchable power
> supply.  I asked if this would be a place to put a diode.  He wasn't sure
> that it was needed.  I am going to check with my local camping store to 
> see
> if they ever offer a filtered power supply.  73.  Gary KB2YAA
> ----- Original Message ----- 
> From: "Tom Behler" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Monday, May 14, 2012 7:53 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
>