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CB beam question

Discussion in 'CB Antennas' started by NF822WNY, Aug 22, 2017.

  1. NF822WNY

    NF822WNY New Member

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    I was wondering if it were possible to put a beam antenna on a mast. I was looking at the L2 Quad from Lightning Antennas.

    http://www.lightningantennas.com/quad-models/l2-quad-bis/

    I have read and heard that masts should not be used with beam antennas but this beam is a small 2 element beam weighing 11 lbs with a wind area of 1.8 square feet. I was hoping this may be small enough to use with a mast. I understand that i would have to use guy wires and was thinking a Rohn 50 mast would be suitable. I would also have to use a small tv rotor to move this around.

    Has anyone had a set up like this before? is it possible?


     

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  2. undertaker

    undertaker Undertaker

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    Yes it is like you said you will have to guy it .....
     
  3. w9cll

    w9cll W9WDX Amateur Radio Club Member

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    A mast is fine but guy it
     
  4. NF822WNY

    NF822WNY New Member

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    Thanks, the additional rotor weight and wind load shouldn't matter?
     
  5. undertaker

    undertaker Undertaker

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    If you use a 50 ft mast you will have to guy all the rings..
     
  6. Robb

    Robb Yup

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    Gut it every 10 ft.
    Guy it directly under the rotor - too.
     
  7. sp5it

    sp5it Master of puppets

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    Wrong. It is best way to break rotator and antenna.
    Mike
     
  8. Robb

    Robb Yup

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    Never had that issue
    Explain please?
     
  9. sp5it

    sp5it Master of puppets

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    When you put guy lines for example 3m below top of the tower, under strong wind all over that point is bending, that means less force on the rotator.
    When you guy that right under rotator, all bending force under the wind is on the rotator.
    It is tower design basics man.
    Mike
     
    tecnicoloco likes this.
  10. Robb

    Robb Yup

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    Tell you what I know first hand. I did it the way you've described when i first set it up. Because you have more unsupported weight/inertia free floating, it will allow the mast to fold. Wasn't pretty; had to take the beam apart and straighten each piece and I also lost four feet off of the top of the mast. Remember, we are talking about a mast here; not a tower. Been there; done that.
     
  11. sp5it

    sp5it Master of puppets

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    Same behaviour for 2 inch pipe. Period.
    Mike
     
  12. Robb

    Robb Yup

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    So after I fixed everything and put it back together, I put the guy ropes at the base of the rotor and every ten feet below it and never had a problem since. Had some pretty severe winds come thru and it didn't even flinch after that. So you are wrong sp5it - sorry . . .
     
  13. sp5it

    sp5it Master of puppets

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    It proves only one thing. Wind wasn't that strong.
    EOT for me.
    Mike
     
  14. Robb

    Robb Yup

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    Nope; one particular storm rolled thru with 50+ mph winds . . . no problems whatsoever . . .
     
    #14 Robb, Aug 22, 2017
    Last edited: Aug 23, 2017
  15. Road Squawker

    Road Squawker Sr. Member

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    Sooooo, just put a rotating ring above the rotor and attach the guys there.
    [​IMG]
     
    NF822WNY likes this.

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