Great job! Thanks for posting both your efforts and results - very
useful. One question: where did you buy the Corcom filter and can you
give us the model or part number? I was unaware that Corcom was now making
a filter specifically for VFDs.
73, Dale
WA9ENA
> [Original Message]
> From: Christopher E. Brown <cbrown@woods.net>
> To: kd4e <doc@kd4e.com>
> Cc: RFI List <rfi@contesting.com>
> Date: 9/6/2009 1:48:32
> Subject: Re: [RFI] RFI & Washing Machines
>
> On Fri, 4 Sep 2009, kd4e wrote:
>
> > There has been some discussion here about modern washing
> > machines and RFI.
> >
> > Can anyone recommend one, please?
> >
> > 1. Currently on the market.
> >
> > 2. Front-loading (better efficiency).
> >
> > 3. RFI-quiet (or easily fixed).
> >
> > 4. Under $600.
> >
> > 5. Preferably Made in the USA or at least in a still-free
> > country - Canada, Mexico, Taiwan, Japan, India,
> > Poland, S. Korea but definitely not China.
>
>
>
> Every direct drive variable speed washer I have listened to is RF noisy.
> After noticing issues with my Kenmore I made it a point to bring the HT
> and "sample" as many as possible and friends/relative/etc places.
>
> Some had noisy control systems, all of the front loaders had noisy drive
> systems.
>
>
>
> Mine happens to have a nearly silent control system, onboard electronics
> can only be picked up with a sense antenna a couple feet from the panel.
>
>
> The drive system however, I could clearly hear drum start/run/reverse and
> spinn cycles, easy to tell what the washer was doing 160-10.
>
>
> Since every similar washer I checked was at least as bad, and mine only
> had motor controller noise I ordered a Corecom filter brick, 10amp, one
of
> the higher end units noted for use on VFD (Variable Frequency Drive)
> systems.
>
> I installed inside the washer case where the power cord enters, almost
> silent (90+ percent gone). Note, the filter *only* works when the filter
> body has a very good connection to the washer chassis, leave it floating
> and it makes no impact on the noise. I ground the paint off of the
inside
> of the chassis under the filter mounting tabs and used stainless hardware
> w/ no-ox grease to get a good connection, then removed that panel and
> cleaned up where the panel bonds to the base panel/frame (where motor
> controller and motor casings bolt to) to ensure a good connection.
>
>
> After that I could only hear it below 40 and it was weak, a 2.4in #31
> toroid on the power cable and I can no longer tell when it is running.
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