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Re: [TowerTalk] Terminate braid at top of tower...or

To: Jim Thomson <jim.thom@telus.net>
Subject: Re: [TowerTalk] Terminate braid at top of tower...or
From: Stan Stockton <wa5rtg@gmail.com>
Date: Tue, 4 Nov 2014 06:56:22 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
> 
> ### My problem with the K9YC balun winding technique, as described
> in his tutorial, is the winding technique itself.  He depicts these huge
> loops of coax on the outside of the cores.  How is the completed assy
> mounted to the feedpoint of the typ yagi ?  

I also have trouble contemplating having a big wad of heavy cores hanging from 
the driven element of a large Yagi where the driven element may be 30 feet or 
more from the mast.  

Reading K9YC materials it appears that anything less than 5-9 cores just 
wouldn't be good enough to do a good job on 14-30 MHz.

Look at the specs on the Balun Designs two core choke wound with RG-400, rated 
at 5KW and sealed in a plastic box.  Are those specs wrong or is there a 
discernible difference between that one and one wound on more cores?  Will that 
choke, rated at 5 KW, handle 1500 watts in a contest?  

One other thing that is difficult for me to understand...  Why would anyone 
ever consider using RG-58 or relatively huge diameter, heavy RG-213 (requiring 
more cores) as suggested in the material when silver plated,Teflon insulated, 
higher power handling, stranded center conductor RG-400 is available for very 
little money.

I am gathering the ingredients to make some chokes.  Do not want to be in 
situation where what I don't know DOES hurt me.  Heretofore most of my antennas 
have had coax wound on a piece of PVC.

I am hoping the end result is worth the trouble and not like an A/B real world 
comparison of a tower base with a PE stamped rebar cage design versus someone 
throwing in a big handful of rebar pieces one at a time as the concrete was 
poured for a guyed tower.

73...Stan, K5GO


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