In the USA, the bulk of consumer electronics are all "Part 15"
devices; as a result, they are not protected by the FCC from the
effects immunity problems. Hence, the FCC requires manufacturers to
place the "must accept" statement on their products. So, on a
functional/legal basis, the operator of a bonafide licensed
transmitter is entitled to continue operation.
The owner of the "victim" equipment is entitled to ask it's
manufacturer for suggestions on how to suppress or cure the immunity
problem. It is also possible for the two parties to work out a
schedule to minimize the problem - perhaps a chancy solution - but
that might work too.
However, let me digress. The FCC recently enacted new rules
affecting the Amateur Radio service (FCC Rules, Part 97). These new
rules require a RF safety-based assesment of the field strength of
"Ham" stations that transmit with more than 50 Watts of power. The
assesment method, from my last reading on the topic, is not yet
defined and has resulted in a lot of confusion (and flat out anger)
in the Ham radio community.
(I conjecture that this rule could eventually lead to similar
requirements for manufacturers of commercial transmitters, two way
radios, and the like.)
I presume that your friend is, indeed, a Ham radio operator, since
the frequency you mentioned is within what is called the 80 meter
amateur radio band, as allocated by the FCC. An attic antenna could
easily produce strong RF fields in both the operator's and the
adjoining condo. (Though there are some important factors, such as
antenna orientation/pattern, resistive losses, radiation efficiency,
losses from poor impedance matching, that could mitigate the
problem.)
I suggest you or your friend visit the various Ham radio oriented web
sites - for there is a lot of current information on the topic; and,
certainly check out the FCC web site for the actual text of the
rules. Note that the FCC also publishes an Interference Control
Handbook (for your orignal topic) which they also make directly
available to the public at their web site.
These page should be a good place to start:
http://www.acs.ncsu.edu/HamRadio/FCC/index.html (FCC Part 97 Rules)
You can also, from this page, jump directly to the FCC web site. And
certain employ a search engine such as Yahoo to find more sites.
Regards and Good Luck,
Eric Lifsey
Ham Callsign AC7K
(they call me "Compliance Engineer"?)
_______________________________________________________________________________
Subject: The Age Old Question of Interfering with Someone's Home Ster
From: [email protected] (Doug McKean) at Internet
List-Post: [email protected]
Date: 12/17/96 1:10 PM
Yes, the old question of interference from one home to
another.
I just had a friend (yes really, a friend) ask the
following:
He has a 100 Watt Shortwave radio transmitter/reciever
setup in his home (a condo). All approved equipment.
He operates in the 75m band (3.765 MHz). His antenna
is in his attic out of view.
He believes he is interfering with his neighbor's
stereo who lives right next to him in the condo.
He is extremely concerned about operating "within the law".
Is he? I think he is. Only from what he's told me,
it sounds like everything is ok.
Doesn't the "must accept" on the FCC label make the
burden of correction on the owner of the stereo?
Thanks in advance.
*******************************************************
-------------------------------------------------------
The comments and opinions stated herein are mine alone,
and do not reflect those of my employer.
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