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Re: [RFI] RFI & Washing Machines

To: "Christopher E. Brown" <cbrown@woods.net>, "kd4e" <doc@kd4e.com>
Subject: Re: [RFI] RFI & Washing Machines
From: "Dale Svetanoff" <svetanoff@earthlink.net>
Reply-to: svetanoff@earthlink.net
Date: Sun, 6 Sep 2009 06:23:09 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
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

> [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
> 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
> 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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