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[TowerTalk] Coil across feed point of dipole

To: "TowerTalk@contesting.com" <TowerTalk@contesting.com>
Subject: [TowerTalk] Coil across feed point of dipole
From: Stan Stockton <wa5rtg@gmail.com>
Date: Wed, 16 Oct 2019 07:42:29 -0500
List-post: <mailto:towertalk@contesting.com>
I am leaving this weekend for ZF and don't have a lot of time for 
experimentation.  Just starting to focus on radio after 6 months of golf.  
Retirement is fun!  

I want to put a 40m dipole above a Tribander which I already know from 
experience will beat my salt water vertical by several S units in directions 
over land.  I am aware of interactions between the dipole and the Tribander.  
The dipole will likely consist of about 24 feet of tubing that will be parallel 
to the ground with another ~23 feet of wire on each end that will slope to the 
least extent possible.  Figured I would have a collar on the mast and attach 
the dipole boom-mast plate to a larger size of tubing above the collar so the 
Yagi can turn without moving the dipole.

I want it to add to top loading so I can shunt feed the tower for 160m.  In 
order to electrically connect both sides of the dipole to the mast above the 
Tribander I propose to connect a coil across the feed point and connect the 
shield of the coax to the mast.  Unlike the hairpins I use on the near salt 
water verticals to raise the R from very low to 50 ohms, I don't want this coil 
to have any affect on R at all.

I need to know some approximate dimensions of what that coil should be and also 
whether there are other concerns I may have not considered.

Thanks... Stan, ZF9CW


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