We have a local fence supply house that sells 20ft lengths of 1.90"
high carbon galvanized steel posts for around $50.
These are more than adequate for lightweight monoband yagis and
tribanders, where 10ft is above the tower, and 10ft below to the
rotor. HOWEVER, the rotor and thrust bearing must be shimmed to
center the mast in both.
73 Bill N4LG
At 12:33 PM 12/29/2019, you wrote:
I think all the talk about big stacks skews the thinking of us who
have modest goals.
I expect EMT or water pipe will meet your needs.
It's a good chance to learn to use one of the mast calculators.
Diameter is your friend!
I agree with the "What if it fails?" questioner, as long as you
can replace the $20 mast safely.
Use two bearings to take the side load off the rotator.
Keep the rotator inside the tower and locate it so as to put the
amount of mast needed outside the tower.
When you use cheap material, you can put the rotator as far down
as you like, to make service easy.
WL
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