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

[Dan K2YWE]

Thanks. I was thinking it's good to have shunt paths to ground, like the
Corcom will have, to add to the effectiveness of the choke.

73, Dan

On Wed, Sep 29, 2021, 5:25 PM Don Kirk <wd8dsb at gmail.com> wrote:

> Hi Dan,
>
> I tested the toroid core choke between the fridge and the corcom and also
> between the corcom and wall outlet and both locations worked great in the
> elimination of the RFI at Mike’s QTH.
>
> Don wd8dsb
>
> On Wed, Sep 29, 2021 at 5:21 PM Dan K2YWE <dan.k2ywe at gmail.com> wrote:
>
>> 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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>>