Path: utzoo!attcan!uunet!cs.utexas.edu!csd4.csd.uwm.edu!mailrus!ncar!asuvax!anasaz!john
From: john@anasaz.UUCP (John Moore)
Newsgroups: sci.electronics
Subject: Re: "Spybuster" AD COPY
Message-ID: <650@anasaz.UUCP>
Date: 24 Aug 89 14:39:46 GMT
References: <17100002@inmet> <647@anasaz.UUCP> <791@mipos3.intel.com>
Reply-To: john@anasaz.UUCP (John Moore)
Organization: Anasazi Inc, Phoenix AZ
Lines: 25

In article <791@mipos3.intel.com> jmasters@pcocd2.UUCP (Justin Masters ) writes:
]In article <647@anasaz.UUCP] john@anasaz.UUCP (John Moore) writes:
]+
]+The ironic thing is that I would probably use one IN an airplane
]+as a collision alert detector. It's a strange triumph of free
]+market over government control that this device is available
]+for $299, and would be quite useful as an airborne anti-collision
]+warning device with slightly different programming; meanwhile the
]+FAA has been twiddling around for 20 years and has yet to come
]+up with an effective and affordable airborne anti-collision device.
]
]Wouldn't you just get the reflections from a plane at 0 feet?  Seems to me it
]would cancel out other planes' signals and get yours.

You would obviously have to discriminate other signals from your own.
That shouldn't be too hard - you know which one is yours by the
signal strength. By comparing the timing between your signal
and that from others, you can get an idea of distance. By putting
the antenna on top of your plane (the transponder antenna is normally
on the bottom), you reduce the overload caused by your own transponder.
-- 
John Moore (NJ7E)           mcdphx!anasaz!john asuvax!anasaz!john
(602) 861-7607 (day or eve) long palladium, short petroleum
7525 Clearwater Pkwy, Scottsdale, AZ 85253
The 2nd amendment is about military weapons, NOT JUST hunting weapons!