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Path: utzoo!mnetor!genat!george
From: george@genat.UUCP (George Gorsline)
Newsgroups: comp.sys.ibm.pc
Subject: Re: modem plays the radio?
Message-ID: <194@genat.UUCP>
Date: Fri, 14-Aug-87 09:13:01 EDT
Article-I.D.: genat.194
Posted: Fri Aug 14 09:13:01 1987
Date-Received: Sat, 15-Aug-87 15:01:33 EDT
References: <2187@sphinx.uchicago.edu>
Reply-To: george@genat.UUCP (George Gorsline)
Distribution: world
Organization: Genamation Inc. (Toronto Ontario, Canada)
Lines: 25

Pick-up of radio signals by non-receiving equipment is not that unusual.
Manufacturers routinely don't put in any "extra" components which would
prevent "RFI - radio frequency interference" because the odds are that the
equipment won't be close enough to the radio signal source for the design
shortcut to be noticed.  This is a well and painfully known occurance to hams,
as most of us have had to remedy neighbour's electronic phones, stereos, etc.
to eliminate this.  What happens is that the serial cable or sometimes the
power cord acts like an antenna and feeds the signal into the computer/modem
where among all of the circuit components, a crystal set can easily be found.
This is not multi-tasking, rather its digital/analogue co-processing! :-).

Standard remedies include using shielded cables, shorter cables, and/or use of
a toriodal choke through which the cable in question is wrapped around.  Of
course, the computer and modem should be plugged into a good three-wire
grounded AC outlet.  Chances are you already know a ham as a neighbour or at
work.  He/she should be able to help and glad its KMOX and not their own
set-up who is your unintended guest.  If not, post a request for help to
rec.ham-radio.
-- 
	George Gorsline, Jr.  VE3FIU / K8HI
	One of the VE3YDX gang... Y DX?  Because it's there(~Y)!
			__... ...__  . ...  _.. _.._
	Genamation, 351 Steelcase Rd. West, Markham Ontario L3R 3W1
	{allegra|linus|ihnp4|...}!utzoo!mnetor!genat!george
	(416) 475-9434