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[TowerTalk] re Feeding a long distance yagi

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Subject: [TowerTalk] re Feeding a long distance yagi
From: "Peter" <>
Date: Tue, 18 Nov 2008 11:59:52 +1100
List-post: <">>

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 

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.


Peter   VK3QI

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