Radar mast pole height

Discussion in 'Boat Design' started by jimbo2010, Oct 13, 2010.

  1. jimbo2010
    Joined: Sep 2010
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    Location: Florida

    jimbo2010 Junior Member

    I have a 2kw 18" dome, trying to figure the height off the deck or cockpit sole it has a 25 deg vertical bandwidth,

    So it would have a 12.5 D downward beam, will the height above the boom matter?

    I know it needs to be above my head but I don't want to use a taller pole than needed.

    I also saw the dome can be tilted up 5 deg with no effect?
     
  2. Greybarn
    Joined: Apr 2006
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    Greybarn Junior Member

    We set the radar mast height so that the lower edge of the beam can't hit anyone within 6 feet.
     
  3. jimbo2010
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    jimbo2010 Junior Member

    Any basis for the 6' parameter?
     
  4. Greybarn
    Joined: Apr 2006
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    Greybarn Junior Member

    Its based on manufacturers recommendations.... We actually push it out a little farther than that just to keep from frying someones brain....
     
  5. cthippo
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    cthippo Senior Member

    Still waiting to see that happen.

    I've only heard of one case of someone getting cooked by non-ionizing radiation and that was at a lot more than 2 Kw
     
  6. jimbo2010
    Joined: Sep 2010
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    jimbo2010 Junior Member

    My question is if you say 6' for 2kw how many feet for 4kw etc.

    Is there anything you can cite as a reference please?
     
  7. WickedGood

    WickedGood Guest

    Take a 6 ft high wooden pole , attach a simple plastic protractor ( Available in the school kids section of walmart) to the top


    Hold the pole at the Bow of the boat and at the stern and pull a 12.5 degree sightline or use a string to another pole held up where you want to mount the radar.

    Easy inexpensive and No Guessing. Just mark the RADAR pole with a pensil or crayon and make your radar mount that hieght.

    heres a BONUS! If you make the Radar Mast with a spot to mount a 3 ft copper rod sticking straight up and connect a #4 or larger copper strand cable to a bronze dissapation plate on the bottom of your hull you will have a lightning rod that will protect your boat and all its electronics.

    And it looks realy Cool to boot!


    [​IMG]
     
  8. wardd
    Joined: Apr 2009
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    wardd Senior Member

    trig and a tape measure?
     
  9. daiquiri
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    Location: Italy (Garda Lake) and Croatia (Istria)

    daiquiri Engineering and Design

  10. WickedGood

    WickedGood Guest

    No Need to trouble your Brain with Complicated Trigonometry, Slide Rules and Plum Bobs.

    Just pull a string. It ususlly pulls straight and is rather inexpensive and you can trudss up theThanksgiving Turkey with it when your done, and then get to use it again to string up your pole beans.

    Just be sure to mount your RADAR Pointing North when you install it. for that your gonna need a Compass. Be sure to get one with numbers on it rather than just letters. And if your South of the MAson/ Dixon line keep in mind that your still gonna have to enter N for Lattitude no matter how bad you feel about it.


    Stay Tuned and Ill learn yall how to install SatNAV

    [​IMG]
     
  11. tom28571
    Joined: Dec 2001
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    tom28571 Senior Member

    Nice drawings but they are not very reasonable for mounting a radar on a pole at the stern. Just look around and you will see that they are high enough to not give any issue with people banging into them and the beam is clear of those in the cockpit or near the stern. A too high pole gives problems with bracing for stability. The KW rating is instantaneous power of the pulse which, for a short range RADAR is way less than a microsecond, so average or RMS power is very small.

    You don't want to mount the thing by your head at eye level but the occasional bursts to someone on the bow is not a problem. Because of the spread of the beam width, power goes down exponentially with distance. That is how the 6' distance comes in. The Mfg figures that at that distance, the power density is low enough not to be a health problem.

    I guess we need to have something to scare us. It's bedbugs turn now so the little RADARS will have to wait in line with cell phones.
     
  12. WickedGood

    WickedGood Guest

    Another Good Invention is the Radiation dribble shield.

    Its a little know fact that the US Govt has been experimenting with these high technolgy barriers to effetvetivly block radiation

    Here are some 3 million dollar proto-types being analyized.



    [​IMG]



    Ill get you a WickedGood Deal on some. Just $39.95 each plus S& H

    ( May have blueberry or Cherry residew on them, but it wont affect operation)



    As SEEN ON TV!


    [​IMG]
     
  13. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    I don't know about your head, but make sure they are above your testicles.
     

  14. jimbo2010
    Joined: Sep 2010
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    jimbo2010 Junior Member

    That was a very good link link thanks


    Thanks for the explaination
     
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