I removed the short aluminum tubes and replaced with longer (I think inch36
inch) steel ones. In anticipation of running high power I replaced the
shelves at the top of the tower section with replacements I made out of 3/4
inch Delrin. Now I think I will use the trap and wire 160 kit anyway so I
can't report on the effectiveness of the shelves. I picked up the antenna
incomplete at a flea market and never put any stubs on it other than the 40
meter tip. Hope to get the 160 kit up on it in a few weeks.
On Dec 16, 2014 5:51 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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>
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