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  1. #1
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    Default Ku band in December???

    It says on one of Roy's pages that there is a comany with Ku band radar guns, and they're going to sell them to America in December. I thought that was a Europe only thing and disregaurded it. I just bought a Whistler Pro 73 with no Ku band detection... am I up a creek? What do you guys think?

    Thanks

  2. #2
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    I wouldn't really sweat it. Ku has been rumored to be "right around the corner" for quite some time. Even if it does hit the market it will take time for it to become widespread. The only selling point it could possibly have is the fact that most detectors don't pick it up, and there are other technologies like POP and laser that do the same thing without the drawbacks of low-frequency (close to X-band) radio signals. Worst case scenario is you have a couple of years after it hits the streets before you are likely to see it.

  3. #3
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    Even if Ku is introduced formally in December, it'll take a few years (at least) for the technology to become widespread enough to matter to most of us.

    Now, if you live in Florida, Oklahoma, Texas, or any other state that's notoriously big on speed trapping and buys new stuff fast to stay ahead of detectors, then consider saving up for a Bel RX-65 or V1 next year.

    Otherwise, just keep an eye on what type of radar guns your local/state police are purchasing, know what bands those guns run, and be aware that you'll be sinking some money into a new detector once Ku hits your region. That's how I'd go about it.

  4. #4
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    Default

    Quote Originally Posted by brick
    The only selling point it could possibly have is the fact that most detectors don't pick it up, and there are other technologies like POP and laser that do the same thing without the drawbacks of low-frequency (close to X-band) radio signals.
    Please expound on the drawbacks of lower-frequency radar. As far as I know, range through the atmosphere is still good and the frequency difference between the transmitted and reflected signal still depends on your speed. What are the technical issues?

  5. #5
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    I think that main drawback to lower frequency radar is that due to the longer wavelength, a much larger antenna is required to get more gain and a smaller beamwidth, compared to K and Ka. Larger antenna = less dash space, and in patrol cars space is at a premium. As for beamwidth, some X-Band radar units had a beamwidth of 20 degrees or more, so they were much more prone to errors such as shadowing etc. If they used a larger antenna they could narrow the beamwidth, but that would probably make so large it would be impractical.

    Larger antennas might not be as much of an issue though if they choose to mount the antennas on the lightbar or something that.

    As far as signal propegation, the lower frequencies could actually work better as they don't suffer as much loss in adverse weather conditions comapred to K and Ka.

    Jim

  6. #6
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    Default In December

    Have to update my pages, the projected date now is early Spring..
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  7. #7
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    What will be interesting if Ku hits the States is how many digital Satelites we pick up as well on the same band. It is now mandated that all C-Band satelites go to Ku Band, so I think filtering may be in the works for future RDs with Ku Band, especially in Residential zones where everyone has Direct TV or Dish Network.

  8. #8
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    I would be surprised if this is much of an issue. Most digital satellite downlinks operate on frequencies 12.7 GHz and below, police Ku is 13.45 GHz +/- 50 Mhz. Plus the satellite signals are weak, that is why a parabolic dish is used and must be aimed just right, and I don't think we'll be aiming our RD's at the sky.

    However, the oscillators in the LNB's can operate in the 11 GHz range, which could potentially produce harmonics in the police Ka band, as some have reported in the past...

    Jim

  9. #9
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    I wouldn't worry too much about Ku, yet. It's just another decision for a police dept. to make when purchasing new guns, and most guns are K or Ka nowadays, so that's what we'll continue to see.

    Ku is more like X than any K variant, heck, they should have called it Xa instead of Ku. Lower frequencies carry farther and spread out more, which means you can pick up the signal from a long way off. So this is good for detector users, provided you have a detector that does Ku. On the other hand, the LEO will likely be able to clock you from a longer distance as well.

    Hmmm... with 4 radar bands, maybe all the radar gun makers could move away from X and K, use only Ka and Ku for speed radar, and leave X and K for exclusive use by door openers. That would be nice...
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  10. #10
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    Quote Originally Posted by kpatz
    Hmmm... with 4 radar bands, maybe all the radar gun makers could move away from X and K, use only Ka and Ku for speed radar, and leave X and K for exclusive use by door openers. That would be nice...
    A little too nice. Don't you think radar gun makers (and police users) love the fact that there are all those falses on X and (especially) K band to make the average Crapra user ignore their detector after a while? Tempe PD here in Arizona has already caught on--they often set single-car speed traps near shopping centers, gas stations, and fast food restaurants that are known to use K-band door openers.

 

 

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