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ROHN 25 setup help/tips??

Discussion in 'Amateur Radio Antennas' started by PA770, Jan 11, 2019.

  1. PA770

    PA770 W9WDX Member

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    Would it be back to back U bolts or just one and fab a bracket.. I really don't know.


     

  2. PA770

    PA770 W9WDX Member

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    Found this place with custom pipe..

    $30..

    6" of 2" od with 1.5" ID to slide into the 2" mast.. then 18" of 1.5" OD (0.120" wall thickness) to slide into that.

    I would bolt and mig weld it.. then put A99 on that with factory U bolt.

    Overkill maybe??

    Would schedule 40 1.5" ID with 1.90" OD accomplish the same thing as fast as mating with a 2" mast pipe??

    Didn't think to ask what the ID was.of 2" mast pipe.. duh..

    Screenshot_20190112-185518.png
     
    #17 PA770, Jan 13, 2019
    Last edited: Jan 13, 2019
  3. Captain Kilowatt

    Captain Kilowatt Professional Amateur
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    Image on the left will work.

    [​IMG]

    Or this.

    [​IMG]

    Or two of these.

    [​IMG]
     
    PA770 likes this.
  4. PA770

    PA770 W9WDX Member

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    So this is a 2 pk of these for $26.. with 2 stacked on the A99 mounting point to the 2" mast I should be gtg.. Thanks Capt.. nice wide surface area..

    Screenshot_20190112-213734.png
     
  5. PA770

    PA770 W9WDX Member

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    What about an Alliance U110 rotor (rated at 5 sq ft load) $200 and just a 1 3/8" mast for the setup..

    3 element Maco or Sirio and the A99..

    Right around 5 sq ft total..

    Then I could use a different 'rocket top' that fits the smaller mast better using the TB50 bushing..

    I really don't see me going larger up top..

    The A99 would then bolt right on the 1 1/4 - 1 3/8" mast without issue..
     
  6. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    AA19130C-99C7-4006-B33E-1FAB441569F5.jpeg I made a hazer for my Rohn 25 I bought a Yaesu rotor thrust bearing and my 100.00 rotor has worked for almost 2 years. A bearing is well worth the price paid to save a rotor. I have a 4 element Maco flat side and an IMAX on top. Works great.in case your wondering the hazer rides up and down the tower with a winch and cable.
     
  7. Shadetree Mechanic

    Shadetree Mechanic 808 On The North Side of Dover

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    Nice work! Looks great!
     
  8. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    2F47E726-B211-487B-9C19-838963AE70C2.jpeg I bought my tower used, has the rocket top that your talking about. I poured a full yard of concrete and reinforced. 40’ free standing
     
  9. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    Have you checked American tower sections on E-bay I bought my tilt base section and put it in the ground.
     
  10. PA770

    PA770 W9WDX Member

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    Is that a 1 1/4" mast or 2"? And which rotor did you have on it??
     
  11. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    1 1/4 mast galvanized electrical from the Depot 10’ section the threaded one.and the rotor is a chanelmaster. The rotor keeps working but I will change it out for a Yaesu when it does. It wasn’t easy to align and mount the mast rotor and bearing. It was binding until I got it straight
     
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  12. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    D9F43542-CABD-4380-B2BF-AC0E3857F8D5.jpeg D9F43542-CABD-4380-B2BF-AC0E3857F8D5.jpeg I mounted the Maco vertical at first along with my dual band beam for 2 and 70 cm. I like it better flat side with the IMAX vertical on top.
     
    #27 Grogan, Jan 17, 2019 at 5:04 PM
    Last edited: Jan 17, 2019 at 6:55 PM
  13. PA770

    PA770 W9WDX Member

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    Is that one 10' section or is that 2 with a threaded coupler??

    Screenshot_20190117-122926.png
     
  14. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    If I remember right, I used a 10’ section and the IMAX is mounted above the Maco with a small section of The TV antenna mast pipe that Radio Shack was selling. I had it laying around and it’s somewhat strong and light. I think I cut the 10’ section back to 8’ because of the small rotor. And the TV mast fits inside.
     
  15. Grogan

    Grogan W9WDX Amateur Radio Club Member

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    40’ tower called for a hole 3’x3’ and 4 ft deep. Stone in the bottom for drainage and reinforced one full yard of concrete 60 x 80 lb bags but it was cheaper to but it mixed and delivered. She doesn’t move when windy. Check craigs list. There was a bunch of towers in my area. Someone had 4 ea 100 ft towers on the ground for 2,500.00. One nice 80’ crank up ham moving to Florida
     
    Shadetree Mechanic and PA770 like this.

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