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Re: [TowerTalk] shut fed tower and rotator

To: TowerTalk <towertalk@contesting.com>
Subject: Re: [TowerTalk] shut fed tower and rotator
From: Gary Slagel <gdslagel@yahoo.com>
Date: Mon, 14 Feb 2011 09:22:42 -0800 (PST)
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Thanks for the ideas on the rf in the rotator control.  Got enough feedback 
that I wasn't worried about damage to the rotator so I went ahead and did my 
testing at KW.  Sure enuff, the new 80M vertical wouldn't handle a KW!  Exactly 
the problem I suspected I'd have.  I'd built a kind of a trombone capacitor 
with 2 sizes of copper tubing with some nylon matting for an insulator between 
the tubes.  FB at 100W but got arcing at 800W.  
 
Now, I'm going to replace the shunt feed with a simple 80M inv L hanging off 
the tower just so I'll have an 80M vertical to play with in the ARRL CW DX test 
this weekend.  

BTW - I had already coiled the exess rotator cable in about a 14" coil in the 
ham shack.  Not especially to prevent RF but just to keep it neat.  I coiled 
that into a tighter coil, about 6", and it made a significant difference in the 
needle jumping.  After I get the 80M inv L up I'll probably experiment with 
some different rf chokes on the line to take care of any leftover rf.  After 
listening to your feedback it seems like I should worry more about damage to 
the controller then the rotator.
 
73, Gary
 

Gary Slagel
Hot Springs, SD
N0SXX
http://marina.fortunecity.com/sanpedro/351




      
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