Hi Dave,
The 20 amp version of the commercial filter was the model 20DRGG5 which is
manufactured by Delta (I bought it from Digi-Key). This information along
with information on the 14 turn toroid choke are included on my website at
http://sites.google.com/site/treadmillrfi/
73,
Don (wd8dsb)
On Mon, Jan 26, 2015 at 8:47 PM, David Cole <dave@nk7z.net> wrote:
> What filter was this by number please?
> --
> Thanks and 73's,
> For equipment, and software setups and reviews see:
> www.nk7z.net
> for MixW support see;
> http://groups.yahoo.com/neo/groups/mixw/info
> for Dopplergram information see:
> http://groups.yahoo.com/neo/groups/dopplergram/info
> for MM-SSTV see:
> http://groups.yahoo.com/neo/groups/MM-SSTV/info
>
>
> On Mon, 2015-01-26 at 20:19 -0500, Don Kirk wrote:
> > Treadmill combination filter update.
> >
> > Today I replaced the 10 amp commercial filter with the 20 amp version of
> > the filter, and the results are similar. Below are a few measurements on
> > 160 meters and 80 meters showing how effective the combination of the two
> > filters are (14 turn toroid choke, and commercial filter model 20DRGG5
> made
> > by Delta) in reducing my treadmill RFI.
> >
> > *1.8068 Mhz*
> > No Filters : 19db over S9
> > With Filters : S7 which is my noise floor
> >
> > *1.8291 Mhz*
> > No Filters : 15db over S9
> > With Filters : S7 which is my noise floor
> >
> > *3.5250 Mhz*
> > No Filters : 28db over S9
> > With Filters : S6 which is my noise floor
> >
> >
> > *3.5475 Mhz*
> > No Filters : 25db over S9
> > With Filters : S6 which is my noise floor
> >
> > The 3.5250 Mhz readings indicate the filter is knocking the signal down
> at
> > least 46db (and probably more).
> >
> > 73,
> > Don (wd8dsb)
> >
> > On Thu, Jan 8, 2015 at 8:11 AM, Don Kirk <wd8dsb@gmail.com> 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
> 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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> > RFI@contesting.com
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>
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