Newsgroups: sci.electronics Path: cantaloupe.srv.cs.cmu.edu!crabapple.srv.cs.cmu.edu!bb3.andrew.cmu.edu!news.sei.cmu.edu!cis.ohio-state.edu!zaphod.mps.ohio-state.edu!sdd.hp.com!decwrl!netcomsv!netcom.com!gerg From: gerg@netcom.com (Greg Andrews) Subject: Re: Radar detector DETECTORS? Message-ID: Organization: Netcom Online Communications Services (408-241-9760 login: guest) References: <1993Apr06.173031.9793@vdoe386.vak12ed.edu> <1pslckINNmn0@matt.ksu.ksu.edu> Date: Tue, 6 Apr 1993 20:53:07 GMT Lines: 25 nhowland@matt.ksu.ksu.edu (Neal Patrick Howland) writes: > >From what I understand about radar dectectors all they are is a passive >device much like the radio in your car. They work as an antenna picking >up that radar signals that the radar gun sends out. Therefore there would >be no way of detecting a radar detector any more than there would be of >detecting whether some one had a radio in their car. > Unfortunately, you're wrong on both counts. The most common method of implementing a tunable receiver is to have a local oscillator. The local oscillator's frequency can be radiated out of the receiver via the antenna unless the circuit is designed and constructed with great care. For a reference on detecting radios, get the paperback book _Spy Catcher_. The author discovered how to detect radio receivers from their local oscillator emissions back in the *1950s* while he worked for British Intelligence. -Greg -- ::::::::::::::::::: Greg Andrews gerg@netcom.com ::::::::::::::::::: Fortune Cookie: Radioactive cats have 18 half-lives. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::