[TenTec] Whirlpool Duet RFI

[Robert & Linda McGraw K4TAX]

Here's a response from someone that has a Maytag and got it fixed.  Not 
through the assistance of Maytag however.  I'd suspect that the same 
approach will work on the Duet as they use the same concept in motor control 
systems.



73
Bob, K4TAX



OK . IT IS A MAYTAG  NEPTUNE.
FIRST {name/call withheld} SENT ME A TOROID WHICH I RAN THE LINE CORD THRU 
AS MANY TIMES AS I COULD.
THIS HELPED TREMENDOUSLY.

EVENTUALLY {name/call withheld} WHO WAS A MAYTAG SERVICEMAN SENT A COUPLE OF 
FSP PARTS ONE OF WHICH WAS AN IN LINE TOROID WHICH YOU INSTALL IN THE LINE 
CORD INSIDE THE MACHINE AND ANOTHER WHICH YOU ARE SUPPOSED TO INSTALL IN THE 
Y NEUTRAL OF THE 3 PHASE MOTOR IF NECESSARY. I NEVER DID INSTALL THE ONE IN 
THE NEUTRAL AND THE  NOISE IS 99 % ELIMINATED .
 I NEVER NOTICE THE NOISE UNLESS I REALLY LISTEN FOR IT IN FACT I PROBABLY 
HAVEN'T EVEN NOTICED IT RECENTLY.
73
RAY

I DID NOT RECEIVE  ANY HELP FROM  MAYTAG FACTORY PERSONNEL AND/ OR  MY LOCAL 
DEALER.
>



----- Original Message ----- 
From: "Don Rasmussen" <wb8yqj at yahoo.com>
To: <RMcGraw at Blomand.Net>
Sent: Friday, September 09, 2005 6:02 PM
Subject: Fwd: Re: Whirlpool Duet RFI


> Thanks so much Bob,
>
> This is a fairly serious matter at my QTH. I am just
> glad it's me that had control of this issue, that a
> neighbor didn't buy one. Here is an email I got from
> the ham that wrote the eHam piece.
>
> Thanks again,
> Don
>
>
> Re: [TenTec] Noisy Receiver
> from [Robert & Linda McGraw K4TAX] [Permanent
> Link][Original]
>
> To:  Discussion of Ten-Tec Equipment
> <tentec at contesting.com>
> Subject:  Re: [TenTec] Noisy Receiver
> From:  Robert & Linda McGraw K4TAX
> <RMcGraw at Blomand.Net>
> Reply-to:  Discussion of Ten-Tec Equipment
> <tentec at contesting.com>
> Date:  Fri, 09 Sep 2005 17:43:51 -0500
> List-post:  <mailto:tentec at contesting.com>
>
> Very normal for the Duet machines (and others) to
> produce RFI.  The control
> system is a chopper developing a 3 phase control for
> the motor.
>
> Whirlpool is aware of the problem and I understand
> will supply a filter if
> they are pressed hard enough.  Most dealer service
> staffs do not understand
> the magnitude or the technical aspect of the issue.
> Whirlpool says they are
> not liable for the problem as their control system
> does not require
> certification under Part 15.
>
> To fix it yourself,  add some ferrite donuts to the
> line cord very close to
> the machine.  This will require a bit of surgery on
> the cord, perhaps to
> remove it from the machine, wrap the cord through the
> donut several times
> and then reconnect the cord inside the machine.
> Typically, it is conducted
> RFI which is radiated by the house wiring.
>
> I'll inquire of a specific incidence which was
> corrected.
>
> 73
> Bob, K4TAX
>
>
>