[TowerTalk] re 25G base insulator

[Roger (K8RI)]

There is, or was, a small AM station antenna just South of Alma MI between 
old US27 and the new expressway.  IIRC they have 6 verticals that are 
relatively short (probably on the order of 200 feet, give or take) set up in 
two parallel rows of 3.  I haven't driven through there in nearly 10 years 
so I don't know if it's still there.

Roger (K8RI)


> 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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