With those long Spiderbeam spreaders, a large torque force is applied to the
antenna / rotor / tower.
A rotor with a built in wedge-brake is suggested (or alternative rotor)
featuring a complete stop action when applied voltage is removed.
The Hy-Gain Ham4 is a very good solution.
A "friction-brake" would not be a wise solution.
Thanks n 73,
James
ki5dq
--------------------------------------------
On Fri, 4/1/16, Douglas Ruz / CO8DM <co8dm@frcuba.co.cu> wrote:
Subject: [TowerTalk] Need install a BRAKE to protect antenna and rotator...
To: "'TT'" <towertalk@contesting.com>
Date: Friday, April 1, 2016, 10:38 PM
Hi,
I installed a modify spiderbeam few days ago.
Spreaders are 7m long because I added 2 elem (shortened) on 40m.
Few days ago, during a windy day, both U bolts with saddle clamps in the
rotator fail...the antenna
mast (aluminum tube) rotate inside the saddle and broke both coax cables.
I quickly tie a pipe between the center hub and one leg of to tower until I
find a solution.
Maybe I need a Brake mechanism to protect the rotator. Some kind of mechanism
to operate with a rope from the
bottom of tower.
It is very interesting...the center hub is connected with an U bolt with
saddle clamp to the alum mast...I think
strong winds will turn the center hub, so, I need protect the center hub too.
Any idea ?
Thanks,
Doug,
CO8DM
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