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  1. #1
    Join Date
    Aug 2005
    Anchorage, Alaska

    Default Check your speed boxes

    I passed one today, went right beside it-- the white "this is your speed boxes" and it was showing peoples speed as well as my speed (it flashed RED of course cause I was going fast as always..LOL) and my V-1 never sounded a peep--no lights, anything?

    Do they put some out of tune radar gun in there or use something I dont know about??

  2. #2
    Advanced Member
    Join Date
    Dec 2004


    "The failure to alert to a particular speed sign might have one of
    several causes:

    1) The speed sign may employ an FM-CW modulation technique to sense the direction of vehicles in its field of view. This feature is used to
    isolate departing from oncoming traffic. The V1 does not recognize
    FM-CW modulation as a valid police radar signal and tries to reject it.
    FM-CW is allowed for license-free "Part 15" devices by the FCC. FM-CW
    is not allowed for police radar. There are numerous traffic-volume sensors using FM-CW spread all around metropolitan areas these days that detector owners would rather not produce an alert. Otherwise freeway driving (in Cincinnati, at least) would be very annoying. It's a good thing that the V1 rejects FM-CW modulated signals.

    2) The speed sign may have drifted out of the police radar band from
    aging or temperature. "Part 15" devices are somewhat notorious for this
    behavior. Automatic door sensors and Doppler security sensors are both
    "Part 15" devices, too. Few automatic door sensors use FM-CW because of
    the added expense. The speed sign devices can afford the added cost of
    including the FM-CW modulating hardware.

    3) The V1 in question may need for our service department to have a
    look at it to make sure it is operating correctly."

  3. #3
    Join Date
    Aug 2005
    Anchorage, Alaska


    No wonder 120 views and 1 reply! There is already a thread 3 pages long...LOL



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