[RFI] [TenTec] Whirlpool Duet RFI

Hare, Ed W1RFI w1rfi at arrl.org
Sat Sep 24 00:20:36 EDT 2005

Almost no digital equipment other than personal computers are going to
be certificated (FCC's word) or authorized under a Declaration of
Conformity.  Most digital equipment is "verified," meaning that it must
be tested by the manufacturer. Period.

There are some exemptions from specific emissions limits in the Part 15
rules for appliances.

That is moot, however, as there are almost no specific emissions limits
below 30 MHz for most digital equipment. The limits for digital
equipment are conducted.

The problem with all of that is that the limits are too high.  A "legal"
Part 15 device can create S9 noise locally. Under the rules, the
manufacturers are resposible for meeting the equipment authorization
rules and the operators the devices are responsible for not causing
harmful interference.

Mike Gruber of the ARRL Lab has been contacting some manufacturers about
some of these issues. The only way to resolve some of this with FCC
would be to try to get rules changes. That doesn't go very smoothly
right now, it seems.

Ed Hare, W1RFI
ARRL Laboratory Manager
225 Main St
Newington, CT 06013
Tel: 860-594-0318
Internet: W1RFI at arrl.org
Web: http://www.arrl.org/tis
Member: ASC C63 EMC Committee
   Chairman: Subcommittee 5, Immunity
   Chairman: Ad hoc BPL Working Group
Member: IEEE, Standards Association, Electromagnetic Compatibility
Member: IEEE SCC-28 RF Safety
Member: IEEE EMC Society Standards Development Committee
   Chairman, BPL Study Project
Member: Society of Automotive Engineers EMC/EMR Committee
Board of Directors: QRP Amateur Radio Club International 

> -----Original Message-----
> From: rfi-bounces at contesting.com 
> [mailto:rfi-bounces at contesting.com] On Behalf Of Leigh L Klotz, Jr.
> Sent: Saturday, September 10, 2005 2:03 AM
> To: knesbitt at nucleus.com; Discussion of Ten-Tec Equipment; 
> Don Rasmussen
> Cc: rfi at contesting.com
> Subject: Re: [RFI] [TenTec] Whirlpool Duet RFI
> Ken,
> This is great news on your Industry Canada front.  You can 
> look ip FCC acceptance on the FCC web site.  I looked up 
> Whirlpool and sure enough, only their Microwave ovens had it. 
>  The other appliances don't have to be certified.  That 
> doesn't mean they are exempt from interference complaints, 
> but it just means they don't have numbers or public test results.
> My personal opinion is that the manufacturers are exploiting 
> a loophole and stretching it, and we need to do something about it.
> Leigh / WA5ZNU
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> RFI at contesting.com
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