[RFI] RFI LG Refrig Corcom filter and #31 core

[Dan K2YWE]

I did not watch the video, so please excuse me if the answer is there.
Is the choke on the refer side of the corcom or the mains connection side?
73, Dan


On Wed, Sep 29, 2021 at 5:16 PM Don Kirk <wd8dsb at gmail.com> wrote:

> Hi Jim,
>
> Once again the toroid core choke did not eliminate the RFI on its own.  We
> tried the K9YC toroid choke by itself and it did not eliminate the RFI, we
> tried the corcom filter by itself and it did not eliminate the RFI.  It was
> only when we used both filters in series that Mike reported the RFI was
> gone.  I also tried the toroid choke before and then after the corcom
> filter with identical results on Mike’s RFI.
>
> This is not the first time that I have had to use both filters to eliminate
> RFI.  The first time was on my wife’s treadmill.  It really is an
> interesting phenomena.  I suspect we would notice some components of the
> RFI disappear if looking at it with my SDR receiver or spectrum analyzer
> when using each filter on its own, but the bottom line is that both filters
> were required for Mike ti noice the RFI disappear.
>
> Just FYI,
>
> Don wd8dsb
>
> On Wed, Sep 29, 2021 at 3:50 PM Jim Brown <jim at audiosystemsgroup.com>
> wrote:
>
> > On 9/29/2021 12:10 PM, Mike Wetzel wrote:
> > > My neighbor's LG refrigerator is radiating RFI on 28MHz and Don
> (WD8DSB)
> > > temporarily hooked up a Corcom filter and a cord wrapped around a #31
> > > torroid core that eliminated the interference.
> >
> > I'd bet that the turns around the toroid were doing all the work. Noise
> > is most often on the green wire, which is a chassis-to=chassis
> > connection on the filter.
> >
> > 73, Jim K9YC
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