[RFI] Nasty RFI wiping out higher bands

[Roger (K8RI)]

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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