I suggest you disconnect the cord at the washer end if you still decide you
want to try a toroid after looking at your house wiring. Then all you need
is a core with ID to clear the cord. In my experience the connection is a
terminal block accessible under a removable cover.
73 QWH QWM,
Dan K2YWE (K3AU)
On Tue, Dec 29, 2020, 8:07 PM Howard Lester <howard220@gmail.com> wrote:
> Very long story short: A particular circuit card (I am guessing so) of my
> 2-1/2 year-old Maytag HE washing machine is susceptible to RFI from… my
> propane-fueled furnace! The symptom is occasional: A loud 2-step snapping
> sound that emanates from parts of the back of the machine’s control panel
> when the furnace first gets the signal from the thermostat, and then begins
> its cycling on. It happens just once in a while, and I can prevent it from
> happening at all simply by unplugging the washer from the AC outlet. What
> could be easier?
>
> When the snapping recently occurred when my 16KW Generac generator kicked
> on for its weekly 5-minute exercising, I got even more suspicious. And when
> yesterday I transmitted with 75 watts on 20 m SSB, using my MFJ Hi-Q Loop
> up in the attic about 15-20 feet away from the washer, and I heard the
> snapping multiple times, I then said, “This means war!” ;-) (That was the
> first time I ever heard the washer do that from me transmitting on any
> band. I rarely use more than 50 watts.)
>
> The flat AC cord is a bit under 1/2” across and has a large plug. The plug
> size requires about a 2” I.D. core, but I cannot find anything specifically
> of Type 31 or 77 or, really, anything — except this:
>
>
> https://palomar-engineers.com/ferrite-products/AC-Cable-Noise-Filter-for-Large-Plugs-3-ID-p75172171
> <
> https://palomar-engineers.com/ferrite-products/AC-Cable-Noise-Filter-for-Large-Plugs-3-ID-p75172171
> >
>
> But it’s $40+, and I don’t want to spend that kind of money if it’s not
> the right tool for the job. No, I will not cut the AC cord. The washer is
> past its 1 year full parts and labor warranty, so I’m out of luck there.
> (Until last November, well past the 1 year, I thought all along it was the
> furnace making the snapping sounds.)
>
> Thanks for any ideas. No, I’m not going to replace the washer. As I said,
> I can just unplug the thing except for the few times a week I use it.
>
> Howard N7SO
>
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>
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