tgstewart@pepco.com wrote:
>
> One way to alleviate any potential torque issue is to mount the rotator at
> the base and run a mast all the way up the tower!
> Even mounting it part of the way down should help a lot.
My very first tower in the sixties was a HDBX48 which had been extended
to 72' with a few straight sections, and guyed. I eventually mounted
the rotator near the base, not due to torque considerations (ignorance),
but simply because it is such a nasty tower to climb and work on.
Unfortunately, 70' of 1.5" waterpipe, when attempting to turn and hold
a 4 element triband quad, has 25 or 30 degrees of total twist, which
proved to be unacceptable.
I imagine 40' would have been reasonable, or 70' of high quality mast.
But at that point, one might as well consider some good tower instead.
--
Steve Maki K8LX
steve@oakcom.com
--
FAQ on WWW: http://www.contesting.com/towertalkfaq.html
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
Search: http://www.contesting.com/km9p/search
|