[TowerTalk] Rohn 25 & Mast lingth
wes_n7ws at triconet.org
Mon Apr 17 18:05:13 EDT 2017
I think three feet or so would do. I have a Rohn 45 with a tapered top section
w/thrust bearing. I put the rotor down three rungs (~4') and use a 10' 1/4"
wall DOM steel mast.
I bought the mast material from Industrial Metal Supply which operates in the
SW. You probably have something similar in your area. They have no heartburn
about cutting to length.
On 4/17/2017 1:54 PM, Clifton Keely via TowerTalk wrote:
> I am in the process of erecting a Rohn 25G to 30 feet with a house bracket. My question is how long should the mast be within the tower? I have a thrust bearing top plate and a good rotor for the load, but should the mast extend 2 feet below the top plate or 6 or 8 or 12 feet. Would there be a real advantage to letting the mast go below the next tower joint down (10 ft). DX sells a high budget mast they they won’t cut, it is 22 feet long. I don’t think I want to have a mid sized triband 10 or 12 feet above the top plate/thrust bearing. My plan is to place the antenna at about 5 feet above the top plate/bearing Speak to me someone who knows. Please. All advice greatly appreciated. Clif AA6FE.
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