[TowerTalk] re Feeding a long distance yagi
Peter
forbes.peter.r at edumail.vic.gov.au
Mon Nov 17 19:59:52 EST 2008
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
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