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  1. #1

    Default Possible false alarms for Ka band.


    I live in CA . Im curious what are some devices that causes false Ka alarms on highways and freeways?

  2. #2
    Good Citizen
    Join Date
    Feb 2008
    Raleigh, NC


    I have heard that Cobra's leak out microwaves in the Ka-band. More specifically, they say the upper models leak out Ka. I own a ESD 7000 (the cheapest model) and it easily leaks out on the X-band. But also sporadically leaks out on the Ka-band. To think of it, the Cobra gives out a weak X-band signal, but a very strong Ka-band signal. So maybe that's why we tend to pick up Ka, since it has to travel a few feet.

    Another source of Ka-band is from speed sensors. Personally, I only know of sensors operating on the K-band. But people on this forum have said that they pick up Ka-band from speed sensors that are scattered across interstates and highways across the country.

  3. #3
    Yoda of Radar
    Join Date
    Oct 2007
    Los Angeles Area

    Default Re: Possible false alarms for Ka band.

    Quote Originally Posted by RabbitInTheMoon

    I live in CA . Im curious what are some devices that causes false Ka alarms on highways and freeways?
    Do you see these in the same spots day after day? And where are they? I ask because I'm going to the bay area in the morning for business and could check it out if I find the time. I'm working in Modesto and could easily fly back from any of the 4 airports up there.

  4. #4
    Radar Fanatic
    Join Date
    Jul 2006
    North Bay, CA


    i've never had any ka falses in the same spot. my guess is it is always leaky detectors. sometimes i suspect i'm picking up an officer on another road. once i had a strong ka band reading for a while and i was on a freeway and a highway crossed under it. i saw an officer driving under me on the highway and realized i was getting a reading from an officer driving in a 90 degree angle from me. what was so awkward is I got a strong long reading off of him/her.

  5. #5
    Speed Demon
    Join Date
    Dec 2006


    Leaky Cobra's are one source. With tech mode, I am able to distinguish these. They usually show a low Ka reading. I got a confirmed Cobra false today at 33.761. I've also received several Ka "falses" from construction zones. The ones around me are at ~34.7xx. I love tech mode 8)

  6. #6
    Old Timer
    Join Date
    Nov 2006
    Cleveland/Shaker Heights, Ohio, USA


    Like the others have said, leaky detectors top the list.


    Another possibility, especially in the more "Ritzy" areas, is the increased prevalence of vehicles equipped with RADAR-enabled active safety or cruise-control devices.

    Yes, I know, it's supposed to only be a problem on K-band, but I swear, TWICE now, I've had these vehicles trip off full-blast Ka-band warnings on my 9500i.

    I don't really know why this is happening, though - perhaps the signal was so strong (due to proximity) that it caused some sort of saturation effect, and thus caused the detector to report the wrong band?



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