[TowerTalk] the Flex disc dillemma

Michael Tope W4EF@pacbell.net
Sat, 19 Feb 2000 10:51:57 -0800


Fred,

Yes, you are correct. In either case, whether you use the 
flex disc method, or the long mast method, all you are trying
to do is add a spring between the array's inertia, and the 
rotator. The long mast method will work fine for big HF array's
with reasonably beamwidths. For big VHF/UHF arrays with narrow
beamwidths, one would have to take great care that there wasn't 
excessive "slop" in the mast joints, else you might have some 
pointing accuracy problems. 

Ease of servicing is certainly a good argument for the long mast
approach. 

Mike, W4EF.......


----------
From: 	Fred Meier[SMTP:fmeier@uniserve.com]
Sent: 	Saturday, February 19, 2000 8:00 AM
To: 	towertalk@contesting.com
Subject: 	[TowerTalk] the Flex disc dillemma


Gentlemen: Some time ago I read a suggestion that not only relieves torque
stresses from rotators, but reduces the amount of climbing necessary for
rotator servicing. If you install a long (twenty feet or more) driveline
between the rotator and the antenna stack, you will no longer need to
frequent the NAPA parts store. The driveline effectively absorbs start and
stop strain, as well it allows the array to move slightly in the wind
without straining the braking/holding mechanism of the rotator. It was
sugggested that top tube designed for chain link fencing be used. These
tubes are swaged at on end and can be interconnected with cross bolts. Your
particular installation will determine whether this material is tough
enough for you. As a bonus, the rotator will be mounted nearer the ground
(in twenty foot increments)for somewhat easier servicing. Just remember
that the thrust bearing and possible another steady bearing closer to the
rotator will now need to bear some of the load. Its just a thought... Fred,
VE7 FMN


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