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Re: [RFI] Elimination of Treadmill RFI on 160 meters

To: Christopher Brown <cbrown@woods.net>
Subject: Re: [RFI] Elimination of Treadmill RFI on 160 meters
From: Don Kirk <wd8dsb@gmail.com>
Date: Sat, 10 Jan 2015 02:49:37 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
Hi Chris,

My picture was taken at a bad angle.  I actually soldered the green wire
coming from the treadmill (load side of the filter) to the case of the
filter) as is the green wire on the line side that comes from the wall
receptacle.

I had a feeling someone might question that picture.

Don (wd8dsb)

On Saturday, January 10, 2015, Christopher Brown <cbrown@woods.net> wrote:

> Looking at the picture I am a bit concerned about a potentially serious
> safety issue.
>
> Brick filters like the Delta shown have a pair of line terminals (does
> not matter which is hot and which is neutral so long as you keep it
> straight) but the safety ground terminal bonds to the metal case of the
> filter body.
>
> The filter body in turn is meant to be bonded to the chassis of the
> equipment it is installed in.
>
> I could be wrong, but based on the picture you appear to have neutral
> and safety ground on the equipment side connected to the neutral
> terminal of the filter.
>
>
> This can present a serious hazard, as the green wire bonds to the
> chassis of the treadmill...  Should there be a neutral fault anywhere
> upstream of that filter and the chassis of the treadmill would go hot
> with full line voltage.
>
> For exactly this reason, NEC allows only ONE neutral to safety ground
> bond AT the primary disconnect.  Otherwise, failure of a neutral
> conductor puts voltage on the chassis and creates a shock hazard.
>
>
> On 1/8/15, 4:11, Don Kirk wrote:
> > For many years my wife's treadmill caused strong interference on 160
> meters
> > when it was in use, and yesterday I was able to completely eliminate the
> > RFI using a combination of two different filters.  I created a simple
> > website that documents my tests and the filters used, and for those
> > interested the website URL is treadmillrfi
> <http://sites.google.com/site/treadmillrfi/>
> >
> > The website contains a link to a video on youtube where you can actually
> > see the effectiveness of the filters.
> >
> > 73,
> > Don (wd8dsb)
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