[TowerTalk] Rohn 20/25G leg insulator material

[Mark Robinson]

The consensus was to use solid FR4 G10 rod.

These guys sell it and I believe that they can do the machining required.

http://www.jjorly.com/g10_rod_rods.htm



----- Original Message ----- 
From: "Allen R. Brier" <n5xz at earthlink.net>
To: <towertalk at contesting.com>
Cc: "'Rick Hiller'" <rhiller at sdicgm.com>
Sent: Monday, 13 April, 2009 3:39 PM
Subject: [TowerTalk] Rohn 20/25G leg insulator material


>I wish to build an 80 meter vertical using some Rohn 20G sections I have in
> storage. In the past there was some mention of insulating material that
> could be used at the base. If possible, I would like to get that 
> information
> again from the group. I would like to make the vertical self supporting 
> i.e.
> no guys (bosses request). Will the material be strong enough for that?
>
> In addition, what would be a good recommendation for the vertical
> configuration, i.e. how many 20G sections and how much of a stinger on 
> top?
> Obviously maximum bandwidth and efficiency is the goal and I operate 
> mostly
> CW.
>
> Next, I would also like to consider using the same antenna on 160 meters, 
> by
> switching in a loading coil at the bottom. I know this isn't optimal, but 
> I
> would like some recommendation for how much inductance in would need, or 
> the
> coil configuration (full legal limit, of course). Other recommendations
> would also be appreciated.
>
> Finally, I also have a 70 foot crank-up tower with a 4-el SteppIR on top
> that could be shunt fed. If I did shunt feed the tower, what would be the
> optimal distance between them for phasing purposes?
>
> A lot and questions in one email but I would appreciate any and all 
> advice.
>
> 73,
>
> Allen Brier N5XZ / KL5DX
> 1515 Windloch Lane
> Richmond, TX 77406-2533
> 281-342-1882
> 713-705-4801 (Cell)
> n5xz at arrl.net
>
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