Re: How can a radar detector bedetected?

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Article #15036

#15036

From: Phillip J. Birmingham
Date: Fri, 20 Nov 1992 09:56

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In article <18NOV92.13820140.0036@music.mus.polymtl.ca>, CT64@music.mus.polymtl.ca (Nicolas Gauvin) writes:
> A friend of mine recently got arrested because he was using a radar
> detector. The cops actually used some kind of device to detect its
> radar detector. How is this possible? Isn't a radar detector something
> that only receives but emits nothing?
> 
> 
>                         Nicolas Gauvin
>                         gauvinn@info.polymtl.ca

         Most sensitive radio/radar receivers use the superheterodyne
    principle, where you mix the received signal with a signal of a known
    frequency. This requires a local oscillator, which emits RF that can be
    detected. This is the reason that you may not use radios on airliners;
    the airline is afraid that the local oscillator will screw up the
    navigation instruments.

-- 
 Phillip J. Birmingham   birmingh@fnal.fnal.gov  
 I don't speak for Fermilab, although my mouth is probably big enough...

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From: birmingh@fnalnd.fnal.gov (Phillip J. Birmingham)
Newsgroups: sci.electronics
Subject: Re: How can a radar detector bedetected?
Date: 20 Nov 92 03:56:21 -0600
Organization: Blackriver Recorporations, Inc.
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Message-ID: <1992Nov20.035621.1@fnalnd.fnal.gov>
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