[RFI] RFI Digest, Vol 42, Issue 1

Lee Hill lhill at silent-solutions.com
Fri Jun 2 13:02:08 EDT 2006

They are using PWM motor control to run the high speed motor.
The problem is likely to be low frequency noise coming out the AC line cord.
I would buy a high performance AC line filter for a few bucks off ebay. It
will work tremendously better than even a correctly selected ferrite alone.
Mount the filter body directly to the washer, remove some paint so you get
direct contact. Use very short (less than 6 inches, this is only 75mto 20m
not 2m) wires between the line filter and the AC input of the washer. Then
use a different power cord to go into the line filter. Beware this could
void your warranty.

Keep the wires between the washer and the filter far away from the AC input
cable and where it connects to the "line" side of the filter. The "load"
side of the filter connects to the washer. Make sure the filter current
rating is above the max listed on the washer. Peak current can reduce the
performance of the filter.

Insulate and cover the thing properly/securely so no kids, animals, or
objects cause fire or electrocution.



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Sent: Friday, June 02, 2006 12:00 PM
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Subject: RFI Digest, Vol 42, Issue 1

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Today's Topics:

   1. Re: Washer RFI/EMI (Paul Christensen)


Message: 1
Date: Thu, 1 Jun 2006 20:25:14 -0400
From: "Paul Christensen" <w9ac at arrl.net>
Subject: Re: [RFI] Washer RFI/EMI
To: <rfi at contesting.com>
Message-ID: <008301c685db$04d2e560$033ca8c0 at Dorm>
Content-Type: text/plain; format=flowed; charset="iso-8859-1";

> I've had no RFI problems with my LG High Efficiency Washer/Dryer.
> It's quieter than my CRT television.

I have +40 dB/S9 noise on 75M from a new GE Harmony Washer and can be heard 
all the way up through 20M.  The dryer appears to emit no RFI/EMI.

Is there a common cure among the newer generation of washers?

Paul, W9AC 


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