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Article #1249Re: "Spybuster" AD COPY
From: Steve Sampson
Date: Sat, 19 Aug 1989 09:29
Date: Sat, 19 Aug 1989 09:29
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A couple of thoughts on the Spybuster: 1) With that frequency range it probably uses the ATC Transponder which transmits at 1090 MHz (1.09 GHz), and 2) It doesn't reflect off the aircraft, it's transmitted by it. 3) It's probably an omnidirectional antenna (which has 360 degree coverage) since no mention was made of an azimuth indicator. Would this then be a 1090 MHz receiver with a signal strength meter and alarm threshold control? The aircraft actually sends a burst of replies to ATC every time the Transponder is interrogated. By comparing the amplitude of the last burst with the amplitude of the current burst would then be an indication of closing/opening rate. Just thinking out loud...
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arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!wuarchive!texbell!attctc!sampsonReferences:
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!iuvax!cica!tut.cis.ohio-state.edu!brutus.cs.uiuc.edu!wuarchive!texbell!attctc!sampson From: sampson@attctc.Dallas.TX.US (Steve Sampson) Newsgroups: sci.electronics Subject: Re: "Spybuster" AD COPY Summary: Thoughts on how it operates Message-ID: <9047@attctc.Dallas.TX.US> Date: 19 Aug 89 09:29:06 GMT References: <17100002@inmet> Organization: The Unix(R) Connection, Dallas, Texas Lines: 13