Better to use flenses to couple the mast .Drill and pin have to be correct
otherwise
that hole in 1 year will be bigger from friction.if you need some photos how
whe do it here
let me know
Marc on4ma
----- Original Message -----
From: "Bill Turner" <dezrat@copper.net>
To: <towertalk@contesting.com>
Sent: Saturday, September 16, 2006 3:24 PM
Subject: [TowerTalk] Recommendation for mast on bottom mount rotator
> I'm going to move my rotator to the bottom of my 80 foot tower and
> would like recommendations for the mast. I will support it at the top
> with a thrust bearing, and at least one, possibly two, non-thrust
> bearings part way down to prevent side to side movement.
>
> My question is what would be a good mast material? It would only have
> to support it's own weight and I'm wondering if 2 inch water pipe
> would be suitable? How about 2 inch EMT? The upper mast section which
> actually holds the antenna is high-strength steel.
>
> I would drill and pin the couplers to keep them from coming loose. The
> antenna is a four element quad, about 65 pounds.
>
> Is there a better way? I want to do it right, so within reason, cost
> is not a factor.
>
> All suggestions appreciated.
>
> Bill, W6WRT
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