Hi Steve,
I agree that the 25AG2 is not the best choice for the top section you need. My
choice would be a 25AG3 because it allows you to raise the mast off the rotator,
secure it in place with two set screws, and remove the rotator for service if
you
have to. It does not allow for a thrust bearing other that what is built into
the Orion 2800 (I'm not sure how much the Orion 2800 will take without an
external thrust bearing but I am guessing it is quite a lot). My second choice
would be the 25AG4 flat top with a thrust bearing on top but if you want to
remove the rotator for servicing, you will need a second shelf just above the
rototor to keep the mast upright and vertical if you ever need to remove the
rotator for servicing.
Stan
w7ni@easystreet.com
steve sala wrote:
> My tower has a tapered Rohn 25AG2 top section. I am
> going to put a Force 12 5BAD on top with a 8 element 2
> meter beam 12 feet above it and a comet 2/440 vertical
> at the apex. The tapered top section will not take
> the Rohn thrust bearing but I could put another rotor
> plate inside the tower with a thrust bearing. The
> rotator is the M2 OR2800. would I be better replacing
> the tapered top section with a Rohn 25AG4 flat top
> section which takes a thrust bearing? My top guys are
> at the 80 foot level in the middle of this top section
> of my 85 foot tower.
> Sincerely,
> Steve Sala
> K7AWB
> Spokane
>
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