Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!uunet!nuchat!sugar!karl
From: karl@sugar.hackercorp.com (Karl Lehenbauer)
Newsgroups: comp.sys.amiga
Subject: Re: Radio Wave Interference
Message-ID: <4209@sugar.hackercorp.com>
Date: 25 Sep 89 01:56:51 GMT
References: <376@batman.moravian.EDU> <22359@cup.portal.com> <6369@watdcsu.waterloo.edu>
Reply-To: karl@sugar.hackercorp.com (Karl Lehenbauer)
Organization: Sugar Land Unix - Houston
Lines: 24

In article <6369@watdcsu.waterloo.edu> mgardi@watdcsu.waterloo.edu (M.Gardi - ICR) writes:
>We just purchased a GE cord-less telephone.  

>RRRRRRIIIIIIIIIINNNNNNNNNNGGGGG!.  

>...ringing only occurred when the actual Leader Board screen was being
>displayed on the Amiga....

>Anybody have any clues as to what Leader Board might be doing when this
>happens?

Congratulations, you can now page your cordless phone from your Amiga :-)
Well, the computer generates a lot of RF, and it's different based on
what it's doing.  To prove this, just get an FM radio, put it
next to your computer, and tune it until you get a bunch of noise.
Now run different programs, format floppies, etc.  Wildly different sounds.
It just happens that some combination of the program loop, data being
displayed on the screen, etc, is generating the "right" RFI at a close
enough frequency (or harmonic of the frequency) to make your rather stupid 
and unshielded (no offense) cordless phone freak out.
-- 
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