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Radar Detector Interference?

Discussion in 'Electronic Basics' started by John Gregory, May 8, 2004.

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  1. John Gregory

    John Gregory Guest

    Can a radar detector reporting the speed of a car from 1000 feet away get an
    accurate reading if it has to be aimed in line of vision with huge
    construction I-beams 100 feet away? There's also a guide wire from a utility
    pole that's in the line of vision.
  2. Jim Justus

    Jim Justus Guest

    The I beam is not moving. It would have no effect.
  3. Bill Vajk

    Bill Vajk Guest

    Read about the reflections that sometimes slip into the
    path. 60 minutes or one of the other news magazine TV
    programs demonstrated a stationary house near a highway
    showing a speed of 60 mph.

    If you're just trying to beat a ticket, don't bother. Judges
    are in love with radar. If it is actually *important* then
    you have your work cut out for you.

    Have your lawyer use subpoena power to get a copy of the
    manual for the radar the cop was using. I'd lay 1000:1
    odds the cop has never read it and doesn't know how to
    "calibrate" his radar correctly let alone use it correctly.

    Check the beamwidth of the radar unit and see what else
    was inside that envelope. Remember too that in radar the
    published beamwidth is 1/2 the overall because they measure
    from the center to one edge.

    Most police radars have an effective range of about a mile.
    Cops are taught, incorrectly, that the closest vehicle is
    the one that radar is reporting. Actually the radar reports
    the fastest vehicle it is seeing, and the cop might not
    even be aware the other vehicle is in its range.

    Also check your state's statutes regarding definition of the
    units of measurement. Illinois has no legal definition except
    in the cases that the department of agriculture is involved
    with and that's limited to measurements used in trade. Miles
    per Hour has no legal definition here.

    And last but not least, check to see whether the radar unit
    the cop used was certified within living memory. Most
    jurisdictions are pretty good about getting them certified
    HOWEVER!!!!!!! I found that neither the federal government
    nor the state of Illinois had any requirements that the
    equipment being used to certify police radars ever be certified
    itself to any known standards. And BTW, that applies not only
    to the police radars but also to the tuning forks the cops
    are supposed to use every day at the beginning and the end of
    their shifts. What's even more interesting is that there is,
    in Illinois, no requirement that the person doing the certification
    have any education or ay sort of qualifications. If a three year old
    kid can sign his name he can certify police radar units in Illinois.

    Wanna take any bets about your state?

    Governments can buy police radar units for under $1000. They recover
    that cost in the first dozen or so speeding tickets (much quicker in
    places like New York and New Jersey.)

    Good luck.
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