[TowerTalk] Strengthening Insulated Push-up Pole Base

[Jim White, K4OJ]

I have had good luck using a piece of PVC whose ID is equal to the OD of 
the mast and then running several bolts through the pair... then put 
u-bolts around the outside of the pvc to secure it.

On one antenna I have a pipe set in the ground which I u-bolt a plate 
onto at the base... onto this plate a hinge is bolted... the far side of 
the hinge is bolted to another plate which u-bolts pass through and 
around that outer piece of PVC...

A plate without the hinge and u-bolt attachments for both the pvc 
(antenna) and the supporting pipe is attached to the pvc up about four 
feet from the hinge base...

The hinge allows the antenna to be built/service horizontally and then 
walked up to vertical and the second plates u-bolts hold it vertically...

Be careful to have the bolts passing through the pvc and the antenna not 
short against the sunken support pipe.

Works real good - in a pinch one man can do the tilt over operation but 
of course it is safer with two to avoid it getting from you.

HNY

Jim, K4OJ




Colburn wrote:

> I am thinking of putting up one or two 60' push-up poles isolated
> from ground as part of an experimental 40/60/80/160M antenna system. The 
> bottom section of the push-up pole is 3".
> 
> If I set a 3" ID section of thick-wall PVC inside an 8" section
> and set them in concrete would y'all recommend concrete, sand,
> or ??? in between the sections of PVC?
> 
> I am wondering how the PVC may react to different substances,
> what would provide the best strength, if I want flexiblity
> between the sections, and what might enhance the insulation
> value of the PVC.
> 
> Thanks! & 73, doc kd4e
>