Kio hex beam and rotor question.

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by N8MJS, Feb 22, 2012.

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  1. N8MJS

    N8MJS Ham Member QRZ Page

    I want to put up a Hex beam on my tower. The rotor I will use is a Yaesu G-450A.
    The question I have is

    Will the Yaesu GC-038 bottom mast clamp attachedhed to the G-450A rotor work to mount to a 1.5 inch O.D. 5 foot stick of mast cominging out of my tower?

    Since the Hex beam I will buy has a 1.25 inch O.D. mast requirement.
    I wanted to use 2 of the Yaesu GL-33 mast adjustment plates to make sure the antenna is mounted and centered on the rotor properly. I would be using another 5 foot stick of 1.25 inch O. D. mast from the rotor to the Hex beam antenna.

    I know there are better ways but I'm on a budget and this seems to meet my spending requirements well.

    Open to your advice or thoughts.
    Mike
    KD8HBS
     
  2. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    The G-450A is a small rotator. Can't it fit "inside" the tower on a rotator plate?

    You wouldn't need the lower mast clamp at all, and everything should work fine...
     
  3. N8MJS

    N8MJS Ham Member QRZ Page

    Can you post a link for an example of a rotor plate?
    Thanks,
    Mike
    KD8HBS
     
  4. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    Exactly what tower do you have??? The rotor plate has to fit that. If you go to http://www.rohnnet.com and look up the the "guyed towers" section, go to the 25G and "accessories," and you'll see the rotor plate for that one. But each tower has its own design. What are you using?
     
  5. N8MJS

    N8MJS Ham Member QRZ Page

    Not sure the type of tower I have.
    It was here when I bought my home.
    Here are a few pics of the tower.

    IMAX 2K, JETSTREAM JTB4.jpg
    102_0593.JPG

    Thanks,
    Mike
    KD8HBS
     
  6. WB2WIK

    WB2WIK Premium Subscriber QRZ Page

    If you want to see what a typical "rotator shelf" looks like, go here: http://rohnnet.com/rohn-25g-tower

    Hit "25G Brochure Download" (it goes fast) and go to Page 37 in the brochure. Look at the rotator shelf BAS25G. That's pretty much what they all look like. It's not "part of" the tower, it installs between the legs of the tower by just tilting it into position through the rungs and clamping it in place.

    The Rohn 25G leg spacing is 11-1/14" leg-to-leg (center-to-center). If that's what your tower is, then that very plate would work. If not, there's lots of other plates to choose from, or of course almost any sheet metal shop could simply fabricate one.

    You always want to install the rotator inside the tower if at all possible.
     
  7. VA3MYB

    VA3MYB Ham Member QRZ Page

    I'll be fab'ing my own plate. I have a 40' Delhi tower and am not overly thrilled with the "rotor at the very top" idea so i've picked up a small sheet of 1/4" aluminum and will make a plate i can drop down a couple of rungs for my Yaesu G-1000DXA. I'm also not thrilled with the 1-1/2" opening (what they call a bearing...lol) at the very top holding my 1-1/4" mast so lowering the rotor mount point should give me a tad more stability/support to the mast.

    BTW, please let me know what your opinion is on the KIO once you get it in the air? I'm considering one also and would appreciate your findings.

    Thanks, Marty
     
    Last edited: Feb 25, 2012
  8. AC0FP

    AC0FP Ham Member QRZ Page

    Here is an early construction photo of my KIO Hexbeam hub mounted on a 1 1/4" tube inside a 1 1/2" tube and rotator mast assembly.

    73,

    fp
     

    Attached Files:

  9. N8MJS

    N8MJS Ham Member QRZ Page

    Thanks to all for the info and helpful links and information.
    KD8HBS

    @AC0FP
    What model rotor are you using with that setup?
    I have heard the KIO hex beam can be turned with a tv antenna rotor.
    Are you using a balun?
     
  10. AC0H

    AC0H Ham Member QRZ Page

    Yes, you can use a TV rotor because the antenna is very light...about 25lbs and is symmetrical about the mast.
    Yes, you do need to use a bead balun at the feed to choke off any common mode current on the outside of the coax braid.
    The Hexbeam is a balanced antenna, you're feeding it with an unbalanced feed line.
     
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