[TowerTalk] Stack as vertical

[Michael Rauh]

Hello TTers,

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

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 option.

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