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Re: [RFI] Tv interference

To: rfi@contesting.com
Subject: Re: [RFI] Tv interference
From: Tim Groat <tcgroat@mesanetworks.net>
Date: Fri, 20 Jan 2006 19:15:27 -0700
List-post: <mailto:rfi@contesting.com>
No, appliances have an exemption written into Part 15:

"Section 15.103 Exempted devices.
The following devices are subject only to the general conditions of 
operation in Sections 15.5 and 15.29 and are exempt from the specific 
technical standards and other requirements contained in this Part. The 
operator of the exempted device shall be required to stop operating the 
device upon a finding by the Commission or its representative that the 
device is causing harmful interference. Operation shall not resume until 
the condition causing the harmful interference has been corrected. Although 
not mandatory, it is strongly recommended that the manufacturer of an 
exempted device endeavor to have the device meet the specific technical 
standards in this Part.
(d) A digital device utilized exclusively in an appliance, e.g., microwave 
oven, dishwasher, clothes dryer, air conditioner (central or window), etc."

So unlike PCs, etc. air conditioners aren't subject to mandatory testing 
for compliance to emissions limits for unintentional radiators. When you 
tell the manufacturer of consumer products that compliance is "not 
mandatory", they tend to hear "We don't need to spend money on this." Thus 
we often read about problems with household "white goods" on this list.

Until the FCC is convinced the product causes harmful interference and 
issues a cease-and-desist letter, the manufacturers can sell appliances 
that are much noisier than other consumer products are allowed to be. One 
complaint to the manufacturer and the FCC isn't likely to do much good, but 
many complaints from many people might. Do CC: the ARRL on the complaints, 
so they can document patterns of particular products being a problem and 
push for permanent corrections. That's a long-term proposition; in the 
meantime keep begging customer service for effective repairs.

--Tim (KR0U)

>"Jim Brown" <jim@audiosystemsgroup.com>:
>If the product is used at home, shouldn't it carry a sticker saying that 
>complies with FCC Part 15 as a Class B device? Does it have that sticker?

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