Dick
With your plan, you'll have a lot of shear across your insulators when
letting down the antenna/tower.
Since it's so light of an assembly, here's another idea: mount something
like 2 ea 6x6's on either side, set into a good amount of concrete in a
hole. Bore a hole through both 6x6's, sleeve the holes with teflon or PVC,
and then put your shaft (may need to make a larger diameter one) through
that. On the unsupported corner, you'll need a pier (a 4x4 in concrete)
with teflon or fiberglass on top of it - for that corner to rest on. Then
you're insulated from ground, can series-feed it, and won't have shear
across unsupported nonmetallic insulators.
Good luck!
regards,
Dave Haring N3AC
Forest, VA
On Mon, Nov 23, 2020 at 6:15 PM RVZ via TowerTalk <towertalk@contesting.com>
wrote:
> Hi Guys,
>
> Hoping you'll have some ideas on how I can home brew an "Insulated Fold
> over Base" for an 80-meter Vertical which will be fed at the base and needs
> to be insulated from ground. Related information: The bottom 32' of the
> Vertical will be an Aluminum tower. The top 35' of the Vertical will be
> telescoping aluminum tubing, the combined weight of the Vertical will only
> be about 40 pounds. I plan to guy the tower so there won't be much torque
> on the fold over base. The tower width is 16-3/4" leg center-to-center at
> the base and the leg diameter at the base is 1-1/4" so a Rohn 45 tilt-over
> base would almost work except it wouldn't insulate the tower from
> ground. One thought I've had in mind is to purchase solid fibreglass rod
> that would fit inside the tower legs at the tower base, drill holes through
> the center of the fibreglass rod, and then anchor bolts through the
> fibreglass rod to the tower legs on the top and anchor bolts through
> treated 4"x4"s on the bottom. But in this case the rod would be a small
> diameter of aprx. 3/4" so the anchor bolts would be need to be small
> diameter such as 3/8". Perhaps a better idea would be to purchase
> fibreglass tube to fit over the tower legs and then anchor the fibreglass
> tube to treated 4"x4" at the bottom? Please let me know if you have any
> ideas to share on an "Insulated Fold Over Base" for an 80m. Vertical as I'd
> love to get this operational within a few days for winter DX'ing. TNX &
> 73,Dick- K9OM
> _______________________________________________
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