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Re: [TowerTalk] Tower Insulators

To: "James Bloomfield" <rn23crna@windstream.net>,<towertalk@contesting.com>
Subject: Re: [TowerTalk] Tower Insulators
From: "jeremy-ca" <km1h@jeremy.mv.com>
Date: Tue, 19 Jun 2007 17:42:39 -0400
List-post: <mailto:towertalk@contesting.com>
The ones mentioned are $400 and $1145! Ouch!

Consider feeding the tower as a folded unipole, all you need is some copper 
wire. Ham literature shows a single drop wire; commercial AMers use 3 to 6 
and report improved bandwidth when the electrical length is 110-115 
degrees..

Carl
KM1H



----- Original Message ----- 
From: "James Bloomfield" <rn23crna@windstream.net>
To: <towertalk@contesting.com>
Sent: Tuesday, June 19, 2007 2:52 PM
Subject: [TowerTalk] Tower Insulators


>
>
>    I plan to install a 90 ft. vertical Rohn 25 that is fed with two 'L'
> networks for 160 and 80 meters.
>
>
>
>    This is described in Low-Band DXing by John Devoldere ON4UN.
>
>
>
>    I think I can do everything necessary except I have not been able to
> find insulators for the base of the tower.  There was one commercial 
> source
> but they wanted $300.00.
>
>
>
>    This is a 'budget' project.  The towers were acquired by taking down
> "TV" towers that were no longer in use.  The Coax is commercial hardline
> purchased for $30.00  (260 ft!)
>
>
>
>    The only 'plan' that I have is to build 6 metal disc welded to rods 
> that
> fit inside the tower legs.  They would be insulated with Lexan and bolted
> together in such a way that the bolts would also be insulated.  I have 
> some
> 1/2 inch lexan - from a flee market.
>
>
>
>    I am aware that Rohn made insulators for the tower legs but they are no
> longer available.
>
>
>
>    Ideas and opinions are needed and welcome.
>
>
>
>    KV4FE
>
>    Jim Bloomfield
>
>    On the Suwannee River
>
>    Fl.
>
>
>
>
>
> _______________________________________________
>
>
>
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> 

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