Results 1 to 3 of 3
  1. #1
    Professional
    Join Date
    Oct 2006
    Posts
    1,299

    Default Extreme angle mounting considerations

    Maybe this will end the ongoing BS about mounting consideration for 'extreme angle' shots.


    The total beam divergence for the Osram SPL PL90_3 that the LI (and probably other diode jammers) uses is 11 (+/- 5.5) degrees vertical and 25 (+/- 12.5) degrees horizontal. At those angle, power output is half the peak. At twice that angle, the output is virtually zero:

    http://catalog.osram-os.com/catalogu...00a3dd000100b6

    P.S. The lens on the blinder also has a similar effect (wider coverage horizontally)


    Therefore, if your jammer heads (or input and output diode locations) have +/- 11 degrees clearance vertically, and +/- 25 horizontally, there is no point in wanting extra clearance.


    Side conclusions:

    A vertical head will provide better overpass/underpass protection, and worse to the side protection, compared to a horizontal head.

    It is extremely important to have your heads level, especially vertically.
    Last edited by ahmadr; 07-28-2008 at 11:29 AM.

  2. #2
    Old Timer
    Join Date
    Nov 2006
    Location
    Cleveland/Shaker Heights, Ohio, USA
    Posts
    7,732

    Default

    Very good reference! Thank you!

    I foresee this, with a bit more discussion and measurement of various vehicles/setups, being a sticky!

    Honestly, I don't know if such considerations are "BS" - note that Ivan took such issues into consideration in the design of the rear/Slim LI heads.

    Similarly, look at what good attention paid to setup to clear the vertical divergence, upwards, allowed for protection of Cliff's Mercedes, in the first CFL test.

    Also, this is essentially the same as the issue of leveling heads - it's all about the output beam actually reaching the LIDAR on the receiving end.
    Last edited by TSi+WRX; 07-28-2008 at 04:02 PM.

  3. #3

    Default Re: Extreme angle mounting considerations

    Quote Originally Posted by ahmadr View Post
    Maybe this will end the ongoing BS about mounting consideration for 'extreme angle' shots.


    The total beam divergence for the Osram SPL PL90_3 that the LI (and probably other diode jammers) uses is 11 (+/- 5.5) degrees vertical and 25 (+/- 12.5) degrees horizontal. At those angle, power output is half the peak. At twice that angle, the output is virtually zero:

    http://catalog.osram-os.com/catalogu...00a3dd000100b6

    P.S. The lens on the blinder also has a similar effect (wider coverage horizontally)


    Therefore, if your jammer heads (or input and output diode locations) have +/- 11 degrees clearance vertically, and +/- 25 horizontally, there is no point in wanting extra clearance.


    Side conclusions:

    A vertical head will provide better overpass/underpass protection, and worse to the side protection, compared to a horizontal head.

    It is extremely important to have your heads level, especially vertically.
    Basically I totally agree with your conclusions except for possibly wanting a somewhat narrower vertical beam.

 

 

Similar Threads

  1. Mounting Redline at angle?
    By EZRIDN in forum Escort
    Replies: 20
    Last Post: 12-19-2011, 11:01 AM
  2. Radar Mounting Angle..
    By roxmysox99 in forum Radar Detectors - General
    Replies: 13
    Last Post: 04-07-2010, 07:19 PM
  3. DriveSmart Extreme Angle Roof Shot Punch Through!
    By amoney in forum Laser Jammers - General
    Replies: 9
    Last Post: 05-10-2006, 12:38 PM
  4. mounting v1 on angle
    By philnz in forum Valentine One
    Replies: 1
    Last Post: 10-10-2005, 08:55 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •