[TowerTalk] 2"OD tubing inside a Rohn 25AG2

[Mark Robinson]

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 at whidbey.net>
To: <towertalk at 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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