[TowerTalk] Rohn 45 leg insulator question

[Chuck Dietz]

How does a tower with no antennas on it have any twist?  I guess very tall
towers and wind on long guy wires perhaps, but I would think those forces
would be minuscule on a ham tower...

Chuck W5PR

On Mon, Mar 25, 2019 at 11:53 AM Rob Atkinson <ranchorobbo at gmail.com> wrote:

> Leg insulators are not the way to go for a 160 m. hot tower.  You need
> a tapered bottom section on a single point Lapp or Austin insulator
> that fits on a pin base attached to a concrete pier.  To get an idea,
> just go to google images and type in AM tower base.  The tower has to
> be able to rotate and allow for compression and expansion which a
> single point does.  It's probably cheaper to forget Rohn 45 and go
> with 25, because the bottom taper section and insulator and sections
> will be less expensive.  You can't use a top section upside down
> because they aren't designed for that and the swaging of the sections
> will result in water running down and into the leg overlaps.
>
> If you don't want to do any of this you can put up the R45 tower on a
> pin and base plate as usual uninsulated, and skirt feed it with
> insulated standoffs running up each side of the tower holding wires
> that are bonded to each other to make a wire cover around the tower
> that's floating above ground.  you'll have to break up the guys with
> insulators or use RF transparent guys.   If it were me I'd put up a
> free standing skirt fed tower.
>
> 73
> Rob
> K5UJ
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