In a message dated 5/2/2010 7:30:14 A.M. Pacific Daylight Time,
towertalk-request@contesting.com writes:
> I have 3 sections of 25G, the top being a 25AG2. I would like to use a
12' piece of 2" OD .25" wall 6061-T6 aluminum tubing to get a total
height of around 40'. The antenna will be a 2E Steppir. My question
concerns running the aluminum tubing through the top of the 25AG2. Is
this a reasonable application?
Howdy --
Sure. The OD of the top tube is 2.25" which should take a 2" mast with
no problem.
Island County is at least an 80 MPH windspeed zone so the extended
mast should be fine.
> Can I expect a lot of wear on the tubing when not using a thrust
bearing?
IMO thrust bearings are overrated. You won't notice any wear worth
worrying about. Sometimes the top tubes are welded slightly off so the worst
case is that there might be a little wear somewhere on the mast but you'll
never notice it.
> Will there be sufficient support for the tubing in the rotator (a HAM
IV)?
Sure. It'll take the full weight with no problem. I'm assuming you're
going to guy it - right? GL!
Cheers,
Steve K7LXC
TOWER TECH -
Professional tower services for hams
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