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Re: [RFI] Nasty RFI wiping out higher bands

To: Kelly Johnson <n6kj.kelly@gmail.com>
Subject: Re: [RFI] Nasty RFI wiping out higher bands
From: slater tubman <s.tubman@sasktel.net>
Date: Tue, 16 Dec 2008 16:17:56 -0600
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>
My new Maytag Bravos top load washer is absolutely quiet as is our  
Sonly LCD HD television set. Sometimes things just go right.
Slater, VE5OA

On 16-Dec-08, at 4:06 PM, Kelly Johnson wrote:

I've mentioned this numerous times, but...

My LG HE washer/dryer pair is whisper quiet.  Don't assume that all
front load HE washers generate RFI.

The key for me is to buy ONLY from brick-and-mortar stores that have a
30 day return policy.  I bought mine at Best Buy and told my wife that
it was going back to the store if it generated RFI.  Both my wife and
I were happy to find that it was quiet: quieter than my 14 year old
CRT television.

I'd love to buy a flatscreen television from a low-cost online
retailer, but none of them allow returns so I'm stuck with paying a
bit more for a brick-and-mortar store.  You get what you pay for.



On Tue, Dec 16, 2008 at 12:21 PM, Hardy Landskov <n7rt@cox.net> wrote:
> Roger,
> Ok so where do we buy appliances now that are RFI free? Seems like
> everything is going digital with a microprocessor and a switching  
> power
> supply.
> Hardy N7RT
>
> ----- Original Message -----
> From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
> To: "Paul Christensen" <w9ac@arrl.net>
> Cc: <rfi@contesting.com>
> Sent: Tuesday, December 16, 2008 7:21 AM
> Subject: Re: [RFI] Nasty RFI wiping out higher bands
>
>
>>
>>
>> Paul Christensen wrote:
>>>> We should all be writing our Directors asking for attention and  
>>>> action
>>>> on
>>>> this issue.
>>>>
>>>
>>>
>> Seems to me we should be writing the manufacturers of the devices.
>>> Sec. 15.103(d) reads as follows:
>>>
>>> "(d) A digital device utilized exclusively in an appliance, e.g.,
>>>   microwave oven, dishwasher, clothes dryer, air conditioner  
>>> (central or
>>>   window), etc."
>>>
>>> What exactly is "etc.?"   We cannot continue to allow the drafting  
>>> of
>>> these
>>> absurdly-constructed rules that allow anyone to fill in the blanks  
>>> with
>>> any
>>> device they deem to be an "appliance" when such terms as "etc." are
>>> written
>>> into the rules.
>>>
>> Looks plain to me.  If you have a digital device used in *anything*
>>>> In the meantime, it would be very interesting to know whether a  
>>>> good
>>>> filter (common plus differential mode) on the line cord..."
>>>>
>>>
>>> Not on my GE Harmony washer.  I tried an outboard ICE RFI filter  
>>> on the
>>> line
>>> cord and it had zero impact on RFI.    There's a lot more going on  
>>> inside
>>> a
>>> direct-drive washer that precludes total RFI abatement.  Large  
>>> inductive
>>> loops are used on the circumference of the washer's basin and  
>>> these are a
>>> source of direct RFI radiation.  And even if RFI could be reasonably
>>> mitigated, who wants to assume the risk of voiding their standard or
>>> extended warranties by modifying the appliance?
>>>
>>
>>> I confronted GE's two design engineers on this matter.  They  
>>> didn't beat
>>> around the bush:  They emphatically stated they had no doubt the  
>>> washer
>>> was
>>> emitting RFI, built that their product was Part-15-exempt and as a
>>> manufacturer, they are under no further duty to mitigate the RFI.
>>>
>>>
>> No device like this is exempt. They either don't know, or are blowing
>> smoke, particularly when even electric fences, and door bells are  
>> covered.
>>> In my opinion, Sec. 15.103(d) should be completely removed from the
>>> Rules.
>>>
>>> Paul, W9AC
>>>
>>>
>> I'd go back to the dealer which is the first thing I'd have tried  
>> even
>> before trying to remedy the problem with the washer and dryer, but
>> forewarned is now forearmed.  I wouldn't purchase any appliance  
>> without
>> the understanding that if it caused interference they'd be getting it
>> back.  Most any reputable dealer including the big box stores will do
>> this.
>>
>> 73
>>
>> Roger (K8RI)
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>>>
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