How about using a pointed top section at the bottom? I know that Rohn has
made adaptors to reverse the sex for those who erected a tower the wrong
way. Would it be able to support the tower weight? And adapt to an
insulator?
Carl
KM1H
----- Original Message -----
From: "Rob Atkinson, K5UJ" <k5uj@hotmail.com>
To: <towertalk@contesting.com>
Sent: Monday, August 06, 2007 12:31 PM
Subject: [TowerTalk] re 25G base insulator
> Hi,
>
> AM broadcast stations don't use 25 all that often so insulators for it are
> kind of unusual. Rohn used to make a bottom taper and insulator so you
> might give them a try, or whoever is making the R25 hardware these days.
>
> Because the station wants to use 25, I'm making a few assumptions--the
> tower
> is going to be around 90 degrees and in the higher part of the band so it
> isn't very tall; maybe not even lamped and painted. You say the f/p I is
> 5.5 amps. Assuming a f/p Z of around 36 ohms it looks like a 1 KW station
> (this has nothing to do with the insulator--I'm just having some fun). I
> would be a bit uncomfortable with separate leg inulators at the base. Any
> AM R25 tower is still gg to be pretty tall for the face width. I'd look
> into Austin insulators for a single point ceramic insulator and see if
> they
> have anything. They took over making the Lapp line I believe. A small 7
> inch long Austin might be the ticket depending on the download.
>
> http://www.austininsulators.com/radio/product.html
>
> btw, AM tower sections are often tac welded together.
>
> 73,
>
> rob / k5uj
>
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