I would just get another section of tower and put a shorter steel tube up
there. I had a similar arrangement with my CL-33. The steel pipe will wear
better I think. I would be concerned about the soft metal Aluminum grinding
away.
Better to use another tower section than long sections of tubing I think.
Mark N1UK
----- Original Message -----
From: "Tom Davis" <tdavis@whidbey.net>
To: <towertalk@contesting.com>
Sent: Saturday, 01 May, 2010 2:33 PM
Subject: [TowerTalk] 2"OD tubing inside a Rohn 25AG2
>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? Can I expect a lot of wear on the tubing
> when not using a thrust bearing? Will there be sufficient support for
> the tubing in the rotator (a HAM IV)?
>
> Thanks and 73,
>
> Tom K7TBM
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