Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!elroy!jato!jade!morris
From: morris@jade.jpl.nasa.gov (Mike Morris)
Newsgroups: comp.misc
Subject: Re: Computer Virus Hearings
Message-ID: <1340@jato.Jpl.Nasa.Gov>
Date: 13 Jun 89 05:14:55 GMT
Sender: news@jato.Jpl.Nasa.Gov
Reply-To: morris@jade.Jpl.Nasa.Gov (Mike Morris)
Lines: 24

In article <32205@apple.Apple.COM> desnoyer@Apple.COM (Peter Desnoyers) writes:
>
>I was recently at an event billed as an "art performance" where the
>sound system - during idle periods - was playing a mixture of odd
>music such as marches and bagpipes, and telephone calls. From the
>instructions an operator gave at one point, I believe the calls were
>cellular phone calls being "illegally" tapped. Not exactly what the
>caller intended when they dialed...
>
Probably cordless phones.  Most of the cheap wireless microphones (and even
some of the expensive ones) use 45-50mhz, 152mhz, or 158mhz.  The cordless
phones use 46 & 49mhz channels, and the older IMTS mobile phones have 6 channels
in the 152-158 mhz range.  Since the wireless mikes have low power and rotten
antennas, and are built to a price rather than to a performance spec they need
sloppy, broad and sensitive (but selectivity costs money) receivers.  Hence
the receivers pick up everything when the mikes are turned off between numbers
(to save batteries).  Somebody forgot to tell the sound man to shut off the
wireless mike channel when it wasn't being used.


US Snail:  Mike Morris                    UUCP: Morris@Jade.JPL.NASA.gov 
           P.O. Box 1130                  Also: WA6ILQ
           Arcadia, Ca. 91006-1130
#Include disclaimer.standard     | The opinions above probably do not even