[TowerTalk] A couple of 18HT questions

[Chris]

Right, Universal aluminum towers use a galvanized steel concrete base (I have one).

Chris
KF7P

---- Robie Elms <ruler55 at gmail.com> wrote ----

>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 at 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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>>
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