Allen,
I have no personal experience with attaching aluminum structure to
concrete. However, Universal tower states that this is a problem. See the
following link: http://www.universaltowers.com/I-B.pdf
I have installed a tremendous number of structures over the years. Towers,
pipe racks, structures to hold vessels, etc. and have never seen aluminum
in direct with concrete. When aluminum is involved, galvanized steel was
in contact with the concrete.
Robie - AJ4F
On Tue, Dec 16, 2014 at 11:51 PM, Allen Brier N5XZ <n5xz@earthlink.net>
wrote:
>
> I have the hole dug for my new 18HT tower but still a few more questions:
>
>
>
> 1. The base consists of three 1.75 in by 0.25 in thick aluminum "base
> tubes" with long bolts on the bottom which is pushed into the concrete
> immediately after the pour. Is there any problem with the aluminum
> contacting the concrete producing any kind of adverse chemical reaction?
>
> 2. The rods only go into the concrete perhaps 18 to 24 in. Is that
> sufficient to hold the tower in the concrete?
>
> 3. I have been told that the PVC insulators which are at the top of
> the top tower section should be replaced with Teflon due to high voltage at
> that point while using the antenna on 160 meters with the base loading
> coil.
> (Note I plan to use a larger physical coil than Hy-Gain recommends). Any
> truth to that?
>
>
>
> That is all for now.
>
>
>
> Allen R. Brier N5XZ
>
> 1515 Windloch Lane
>
> Richmond, Texas 77406-2553
>
> (281) 342-1882 (Home)
>
> (713) 705-4801 (Cell)
>
>
>
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