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[TowerTalk] Stack as vertical

Subject: [TowerTalk] Stack as vertical
From: Michael Rauh <>
Reply-to: Michael Rauh <>
Date: Sat, 10 Oct 2009 04:16:51 -0700 (PDT)
List-post: <">>
Hello TTers,

I am planing a stack.  I would like to get double duty as a 160 M vertical as 

I modeled the stack in EZNEC and I can get resonant at about 1.9 MHz at the 
minimum height.  That is just a guess - I won't really know till I build the 
stack. If I add height, of course, I can lower the resonant frequency.

I can series feed or shunt feed at my option.  I imagine series feed would 
require me to disconnect all the rotor wires with relays or use common-mode 
chokes when I am in 160 M mode.  For that reason, shunt feed seems the best 

The first yagi in the stack will be at 30 feet.  That limits the height of the 
Gamma rod or Delta wire to 30 feet also.

Will I be able to match the tower with this limitation?  Especially since the 
actual resonance might be lower than 1.8 MHz.  Would it be better to avoid 
having the resonance in the band?

Mike W8GT


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