"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"
Doug,"
Doug, great that you are getting up some good antennas!
One option would be to use some brake parts from a smaller car. You would
need to find a brake drum setup and attach the backing plate to the tower
and the drum to the mast. The brake pads could be actuated with a master
cylinder near the ground. If you used a rear brake drum there is a chance
that it could have an emergency brake cable that you could extend to the
ground and not need any hydraulics.
Una opción sería utilizar algunas partes de freno de un coche más pequeño.
Necesita encontrar una configuración de tambor de freno y coloque la placa
de soporte a la torre y el tambor en el mástil. Las pastillas del freno
podría accionarse con un cilindro maestro cerca de la tierra. Si usted
utiliza un tambor de freno trasero hay una posibilidad de que podría tener
un cable de freno de emergencia que podría extender en el suelo y no es
necesario ningún sistema hidráulico.
Regards, John NA6L
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