[RE-wrenches] Odd Outback FNDC/Mate issue

[Joel Davidson]

Please correct me if I am wrong, but I thought that twisting wires creates a 
magnetic field and increases radio frequency interference.

----- Original Message ----- 
From: "Richard L Ratico" <Richard.L.Ratico at VALLEY.NET>
To: <re-wrenches at lists.re-wrenches.org>
Sent: Friday, March 27, 2009 6:28 AM
Subject: Re: [RE-wrenches] Odd Outback FNDC/Mate issue


> Howie,
>
> Very high, rapidly fluctuating, DC currents are carried by battery cables. 
> These
> produce powerful, local magnetic fields. Many sources recommend twisting 
> the
> cables together to reduce RFI. I have found this twisting hard to do well. 
> Steel
> conduit accomplishes the same thing, more effectively. Resist the 
> temptation to
> put any other wiring in that conduit. This would most likely be a code 
> violation
> in any case; wires of different voltage ratings in the same conduit are
> generally prohibited.
>
> Dick
>
> Dick Ratico
> Solarwind Electric
>
> --- You wrote:
> Outback has now determined that somehow this induced current from the
> battery cables into the voltage sensing wires for the FNDC can cause the
> communication system to get overwhelmed, but they are not quite sure how.
> None-the-less, as of this week, they are recommending to run the FNDC
> voltage sensing wires (plus and minus) *not* along side the inverter
> cables.
>
> Hopefully, this is the end of this story...
>
> Has anyone experienced any similar symptoms?  This seems a first for OB,
> but I thought I'd ask here.
> --- end of quote ---
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