[TowerTalk] Need install a BRAKE to protect antenna and rotator

[Roger (K8RI) on TT]

On 4/4/2016 Monday 10:19 PM, Douglas Ruz / CO8DM wrote:
> Yes, you are right...The U bolt failure caused the slippage.
>
> It is an small TV antenna rotator. Yes the antenna is balanced. The antennas
> is big spiderbeam...a big cross 46 ft by 46 ft.
>
> Pin the mast to the rotator is a good idea but I am worry about the U bolt
> that join the Center hub with the mast...if that U bolt fail then will get
> problem with the coax again.
>
> I will try installing a telescopic tube in the tower leg...with a pulley can
> move up or down the tube if I want rotate the antenna...that tube is a
> protection if the U bolts fail...If the U bolts fail, the tube will stop the
> rotation of the center hub.
>
> 73,
>
> Doug, CO8DM
>
> -----Mensaje original-----
> De: TowerTalk [mailto:towertalk-bounces at contesting.com] En nombre de Earl
> Morse
> Enviado el: lunes, 04 de abril de 2016 16:18
> Para: towertalk at contesting.com
> Asunto: Re: [TowerTalk] Need install a BRAKE to protect antenna and rotator
>
>
> Thought maybe you had a rotator with no brake installed but then saw that it
> was a U-Bolt failure that caused the slippage.
>
> You can pin the mast to the rotator if slippage is a problem but you should
> have a rotator with a brake so that the rotator doesn't slip.
>
> What kind of rotator?  Is the antenna balanced about the mast?
>
> Earl
> N8SS
>
> ------------------------------
>
> Message: 2
> Date: Sat, 2 Apr 2016 20:49:33 -0700
> From: "John V" <vjohnv at cox.net>
> To: <towertalk at contesting.com>
> Subject: [TowerTalk] Fwd: Need install a BRAKE to protect antenna and
> 	rotator...
> Message-ID: <009501d18d5b$d5ceb850$816c28f0$@net>
> Content-Type: text/plain;	charset="iso-8859-1"
>
> "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 opci?n ser?a utilizar algunas partes de freno de un coche m?s peque?o.
> Necesita encontrar una configuraci?n de tambor de freno y coloque la placa
> de soporte a la torre y el tambor en el m?stil. Las pastillas del freno
> podr?a accionarse con un cilindro maestro cerca de la tierra. Si usted
> utiliza un tambor de freno trasero hay una posibilidad de que podr?a tener
> un cable de freno de emergencia que podr?a extender en el suelo y no es
> necesario ning?n sistema hidr?ulico.
>
>   
>
> Regards, John NA6L
>
>   
>
>
>
> ------------------------------
>
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-- 

73

Roger (K8RI)


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