[TowerTalk] Tower Insulators

[Mark Robinson]

A friend of mine made Rohn 25 insulators for his 80m 4 square by turning 
down fiberglass rods

Mark N1UK G3ZZM

----- Original Message ----- 
From: "jeremy-ca" <km1h at jeremy.mv.com>
To: "James Bloomfield" <rn23crna at windstream.net>; <towertalk at contesting.com>
Sent: Tuesday, 19 June, 2007 5:42 PM
Subject: Re: [TowerTalk] Tower Insulators


> 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 at windstream.net>
> To: <towertalk at 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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