Topband: Elimination of Treadmill RFI on 160 meters

[Tim Shoppa]

A deep "4 inch box"? Add extension rings if necessary? Ganged outlet boxes?

http://www.mcmaster.com/#standard-outlet-boxes/=vohae8

I know I've seen on the web somewhere, a Grow-Light filter with 3 big 2.4"
toroids all in a 4 inch box. I don't think there was any room left for
outlets.

I use 4 inch boxes for all sorts of ham accessories (having nothing to do
with 120VAC power). They are nice and heavy and stay put.

The 3/8" BX clamps work great for cable strain relief.

If the treadmill manufacturer had just included 15 cents of waveshaping at
the MOSFET, all the external filtering would be completely unnecessary.

Tim N3QE

On Thu, Jan 29, 2015 at 1:23 PM, Carl Clawson <clawsoncw at gmail.com> wrote:

> Nice to hear all the comments, recommendations, and indeed some success
> stories here. I too have a treadmill problem. Although I'm blessed with a
> radio-friendly spouse who always asks before she starts it up, I'd like to
> add a line filter. Ferrites on the cord don't by themselves squelch it.
> Murphy dictates that the new one will show up when she's in the middle of
> her workout.
>
> How about some outlet box recommendations?
>
> The electrics are not the hard part for me, it's the mechanics. I've been
> looking for a suitable box to mount it all in and coming up kind of dry.
> Maybe I'm not looking for the right keywords. Seems simple, a box with a
> cutout for two 120VAC outlets and enough room inside for a line filter and
> some toroids. A strain relief clamp would be a big plus but something else
> can always be worked out for that. In the past I've bolted a surface mount
> outlet box to another project box but it's kinda big and ugly, and more
> expensive than it ought to be.
>
> 73 and thanks in advance,
> Carl WS7L
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