Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!rutgers!mailrus!cornell!uw-beaver!ubc-cs!alberta!calgary!ctycal!ingoldsb
From: ingoldsb@ctycal.COM (Terry Ingoldsby)
Newsgroups: sci.electronics
Subject: Re: Car electronics projects
Summary: Car radar detector detectors
Message-ID: <414@ctycal.UUCP>
Date: 24 Jul 89 22:44:38 GMT
Distribution: na
Organization: The City of Calgary, Ab
Lines: 24

While we're on the subject of automotive electronics, my curiosity
was whetted by an article in the paper the other night.  There was
a picture of a device used by the Ontario Highway Police (Provincial
Police) of a gadget said to detect radar detectors in passing cars.

How do these work?  I presume that they attempt to detect the
oscillator in superhet receivers.  How do they know that all the
oscillators run at the same frequency?  Would not the metal cage
of the car shield out virtually all of the radiation emitted from
radar detector (I realize that windows are large holes at microwave
frequencies, but still, the signal emitted from the detector must
be quite small).

I don't have a detector, neither do I intend to buy one, but I am
still curious as to how reliable the radar detector detector is.





-- 
  Terry Ingoldsby                       ctycal!ingoldsb@calgary.UUCP
  Land Information Systems                           or
  The City of Calgary         ...{alberta,ubc-cs,utai}!calgary!ctycal!ingoldsb