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  1. #1
    Radar Fanatic
    Join Date
    Mar 2005
    Location
    Staffordshire, Uk
    Posts
    1,999

    Default the reason for the j function!

    heres what mike said on another forum when asked about the j function!

    From your Instruction Manual Addendum sheet:

    "A New Warning

    V1 has a new feature. When the signal identification system determines that a current warning is not, in fact, a radar threat, it notifies you with a "dee-dah-doo" sound and terminates the warning. At the same time, the letter "J" will flash briefly in the Bogey Counter."


    "J" stands for "J"unk signal.

    OK, why did we add this new feature? Because it was the best way to give beyond-line-of-sight warning capability for POP-radar signals while not burdening the user with an excess of unresolved alerts (false alarms).

    POP signals are short bursts of radar that last only some tens of milliseconds. They are made short in an effort to escape the notice of radar detectors. Simply speeding up the search process of a detector allows high probability-of-intercept for the POP transmissions but introduces another nasty problem -- microwave interference generated by radar detectors in other vehicles causing false alarms.

    There are many hundreds of thousands of certain model BEL, Cobra, Radio Shack, and Uniden detectors that manage to transmit radar-like signals that mimic POP bursts to an infuriating degree. They litter the airwaves with interference bursts on the same, exact frequency as, and similar duration to, a real POP-radar signal. Without some way of fending off these "J"unk signals, a detector would constantly nag its user with false alarms from these poorly designed "poluters" in other cars.

    The common method of reducing the number of false POP alarms used by our competition is to reduce the sensitivity to POP signals (and their Junk kin) while leaving longer-lasting (over half a second) signals unmolested. This method requires reducing POP-radar range to line-of-sight-only distances in order to give enough relief from detector-generated false alarms to be worthwhile. I wasn't satisfied with only line-of-sight range for POP radar reception, so we pushed for a better solution.

    I did nearly 10,000 miles of development driving, dodging speed traps and logging false alarm situations, while our engineers reorganised and optimised the false alarm rejection methods we finally chose. After lengthy deliberations, we realized that it was almost impossible to prevent every POP-like false alarm without taking too large a hit in POP-radar over-the-hill range. I decided that letting in a few POP-junk false alarms initially that were later announced to be "J"unk was less of a problem than not finding out about a POP radar until too late. I hope you'll agree

  2. #2
    Lead Foot
    Join Date
    May 2005
    Posts
    446

    Default

    Very good information. Thanks for bringing this to us. I have to agree I do prefer having "beyond line of sight" protection. VR spends alot of resources in their engineering and it show in the end product and customer satisfaction.

  3. #3
    Cheetah Rep
    Join Date
    Feb 2005
    Location
    Phoenix, Arizona
    Posts
    2,567

    Default

    Here's some additional info i got in an email.

    1. The manual makes no mention that k band is affected by l and L modes, only x band. However changing option 7 does cause k band to be affected in these modes, correct?



    K band's MUTING is affected, but we are talking about SENSITIVITY here. In the modes, only Advanced Logic affects range, and on X only.


    “Page 16
    Computer Modes: A new way to interpret alarms

    In the All-Bogeys® ( ) mode, all bogeys will be reported

    as soon as they are detected. Use your judgment to decide

    whether or not they are threats.

    In the Logic® ( ) and Advanced-Logic® ( ) modes, you are

    deferring to the internal computer which will use its own

    logic to screen bogeys before reporting them to you.

    In Logic, X-band bogeys the computer judges to be

    non-threatening will be reported at the “muted” volume. If

    they become threatening, the audio warning will upgrade

    to the “initial” volume before you are within radar range.

    In Advanced-Logic, X-band bogeys that the computer has

    reason to believe aren’t radar will not be reported at all.

    One exception: To be failsafe, the computer will always

    pass extremely strong signals along for your judgment.

    This mode is particularly useful in metro areas.”







    2. Does option 6 turn the Junk alert on and off, or is the junk alert “built in?
    Is the ka guard the junk alert setting, or is it just for false ka alerts?



    The junk alert is built in. The Ka guard is for false Ka alerts and is not connected to the "J" feature.



    3. Does the junk alert affect k and ka or just ka band?

    The reason I ask is that the manual references the junk feature in 3 places, but it doesn’t discuss how to turn it on and off, or if it is built in, regardless of the ka guard or having Pop on or off.



    The "J" is for false alerts on Ka only. It is built-in.






    Page 6
    Identifying Alarms From Junk Detectors

    Here are a few clues for spotting offending detectors.

    You may get a brief K warning just as you meet an

    oncoming car. Or a lingering K, nearly constant strength,

    as you move with traffic. Big hint: a direction change on

    the Radar Locator as you pass another car. Look for a

    detector in the windshield. But stay alert until you know

    for sure. See page 16 for what “Dee-Dah-Do” tone means.



    Page 16

    What the “Dee-Dah-Doo” Tone means

    Valentine One is designed to recognize — and ignore —

    phony radar signals from poorly-designed detectors.

    Occasionally a false alarm will be started before verification

    is certain. If it then determines the source is a junk detector,

    it will notify you it is retracting that alert with a “Dee-Dah-

    Doo” sound. A flashing J ( ) indicating “junk” will appear

    in the Bogey Counter.


    Page 26
    What the “Dee-Dah-Doo” Tone means

    Valentine One is designed to recognize — and ignore —

    phony POP signals transmitted by poorly-designed

    detectors. Occasionally a false alarm will be started before

    verification is certain. If it then determines the source is a

    junk detector, it will notify you it is retracting that alert with

    a “Dee-Dah-Doo” sound. A flashing J ( ) indicating “junk”

    will flash briefly in the Bogey Counter.


    4. Does this last one mean a detector that has Pop protection enabled?

    The "J" function will work whether POP is enabled or not.


    5. Does it just mean that overall, if the V1 identifies the source as any type pollution from another radar detector, it will just junk it out?


    That is true. That's the function of the "J" feature.

 

 

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