Roger,
My personal choice would be to run the cable down inside the tower to ground
level and then run the cable either over the ground or preferably in a pvc
conduit just below the surface.
I always feel that this is a safer way for both lightning protection,
eliminating unbalanced wind loading on the tower and aesthetics.
However if you do run the cable in the air, it definitely needs a steel
catenary over that sort of distance.
Make sure you test out the rotator with the full length of cable in circuit
and if possible, provide a rotational torque load on the rotator about the
same as the 402CD will provide in a 50 mph wind.
That's when you will find out the current/voltage limitations of the
rotator.
You can simulate that sort of load by clamping the rotator in a vice and use
a torque arm with a known weight attached to produce the load required.
Cheers
Peter VK3QI
Important - This email and any attachments may be confidential. If received in
error, please contact us and delete all copies. Before opening or using
attachments check them for viruses and defects. Regardless of any loss, damage
or consequence, whether caused by the negligence of the sender or not,
resulting directly or indirectly from the use of any attached files our
liability is limited to resupplying any affected attachments. Any
representations or opinions expressed are those of the individual sender, and
not necessarily those of the Department of Education and Early Childhood
Development.
_______________________________________________
_______________________________________________
TowerTalk mailing list
TowerTalk@contesting.com
http://lists.contesting.com/mailman/listinfo/towertalk
|