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  1. #1
    Newcomer
    Join Date
    Feb 2005
    Location
    Colorado Springs, CO
    Posts
    16

    Default False Alert Questions

    I'm a new radar detector user here in Colorado Springs and I've got a few questions after my first weekend with a BEL RX65. I'm running in City mode and have turned off X-band. There are two traffic lights near my house that consistently give me alerts. As I approach the first one I get a LASER alert. I make a left turn, go a couple hundred yards and always get a K-Band Alert (24GHZ) as I approach the second light from either direction. I don't think we have Photo Radar here in Colorado, and I'm pretty sure there was no police cars in the area. What could be causing these alerts? There is a fenced, juvenile detention center near by. Could that be a source?

    In reading about the LASER false alerts I've found the following sources:
    1. direct sunlight
    2. wind shear detectors at airports
    3. center brake lights from certain cars
    4. cruise control distance laser from certain cars

    I've gotton a few other LASER alerts driving into direct sunlight early in the morning. The false alerts are not that frequent and don't bother me too much (just makes me check my speed more often, which was the whole purpose of getting a detector). But I do want to differentiate between false and actual alerts.

    I also got an alert going by a truck weigh station on the highway. Do they ever have "always on" radars monitoring traffic?

    What's the best way to tell how close a threat is? Will close threats go off multiple times or peg the strength meter? I switched to TECH mode so I can get familiar with the frequencies of the various alerts. Which of the three display options do people find most helpful (Signal Strength, Threat Display, or Tech Display)?

  2. #2
    Advanced Member
    Join Date
    Dec 2004
    Location
    Michigan
    Posts
    7,509

    Default Re: False Alert Questions

    Quote Originally Posted by COBEL
    There is a fenced, juvenile detention center near by. Could that be a source?
    Yes! There's a prison that I have driven by and I get multiple alerts. They probably have motion detectors to get the upper hand on any potential escapees.

    Quote Originally Posted by COBEL
    I also got an alert going by a truck weigh station on the highway. Do they ever have "always on" radars monitoring traffic?
    Around truck weigh stations they sometimes use a syatem called "PrePass" that operates on 2.45 GHz or possibly 5.9 GHz. These may produce harmoincs in the police radar bands causing the alerts.

    I've also seen signs that say "mobile patrol when station closed" etc, so there might be police around. I've seen state police hiding behind the weigh stations multiple times.

    Also, I drive some areas near Detroit where there are some radar sources mounted on poles supposably for traffic monitoring, they likely do this in other places as well.

    Quote Originally Posted by COBEL
    What's the best way to tell how close a threat is? Will close threats go off multiple times or peg the strength meter?
    In general, with constant-on as you get closer the strength meter goes up...


    Jim

 

 

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