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[TowerTalk] Vacuum variable / inductor ratings for shunt fed tower

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Subject: [TowerTalk] Vacuum variable / inductor ratings for shunt fed tower
From: "Allen R. Brier" <>
Date: Wed, 10 Jun 2009 23:00:38 -0800
List-post: <">>
What are the minimum ratings required for a vacuum variable used to shunt
feed a tower (used at full legal limit plus some head room)?

I would like to shunt feed my 70 foot tower with a 4 el SteppIR on top
(parasitic elements are NOT YET grounded) but with the 30/40 meter and 6
meter options (all to be used as a capacity hat) on 80 and 160 meters. What
capacitive (and inductive) values am I looking at approximately? I assume
that I will have to switch in some inductance at least on 160 meters. The
tower is a crank-up, but I will be bonding the shield to the tower at top
and bottom plus there is an air terminal on top, also running the full
length of the tower.


Allen Brier N5XZ / KL5DX
1515 Windloch Lane
Richmond, TX 77406-2533
713-705-4801 (Cell)


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