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From: myers@hpfcdj.HP.COM (Bob Myers)
Newsgroups: sci.electronics
Subject: Re: RF Interference
Message-ID: <17660061@hpfcdj.HP.COM>
Date: 10 Apr 90 18:07:31 GMT
References: <1990Apr9.171520.2519@athena.mit.edu>
Organization: Hewlett Packard -- Fort Collins, CO
Lines: 20



A measurement of RF interference, the way it's done to verify compliance with
the various government regulations, requires very carefully-controlled
conditions, such as a test site of certain dimensions and including a ground
screen, the proper antennas, and a calibrated receiver or spectrum analyzer.
With all of this gear, meaningful measurements (usually expressed in dB over
a reference of - I think - 1 uV/meter) of the field strength can be made.
(I have the dubious honor of doing these tests right now, on a new product,
so this subject is currently near and dear.  Sigh.)

You cannot duplicate these measurements in a meaningful way with simple equip-
ment.  I agree that the Amiga may be causing a problem, but it'd be difficult
to show that the unit was not in compliance with the limits to which it was
originally qualified.


Bob Myers  KC0EW   HP Graphics Tech. Div.|  Opinions expressed here are not
                   Ft. Collins, Colorado |  those of my employer or any other
myers%hpfcla@hplabs.hp.com               |  sentient life-form on this planet.