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Re: [TowerTalk] Rotator loops

To: "Joe Subich, W4TV" <>
Subject: Re: [TowerTalk] Rotator loops
From: jimlux <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Sat, 27 Feb 2010 07:37:07 -0800
List-post: <">>
Joe Subich, W4TV wrote:

> Having designed and built those trucks for a few years, there 
> are two issues here: 
> 1) mast height is accommodated by the many turns of the "nycoil" 
>    which stretches like a slinky as the mast is raised.  By the 
>    way, the length of feedline is almost double the mast height. 
> 2) the antenna rotation is accommodated by a single loop.  The 
>    "nycoil" is attached at the top of the mast for support.  The 
>     mast does not rotate - only the antenna rotates. 
> 73, 

Interesting.. Do they use a more flexible chunk of feedline at the top? 
(I suppose, further, that the actual microwave up and downconverter is 
probably up at the antenna, so loss in the cable is less of a worry)

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