[VHFcontesting] stacked yagi's

[Fred Lass]

That doesn't seem right to me.  In most cases stacked antennas are in phase.

If it turns out to be correct and you want them out of phase, turn one of the antennas up-side-down.

Fred  K2TR

--- On Fri, 4/9/10, Paul Decker <kg7hf at comcast.net> wrote:

From: Paul Decker <kg7hf at comcast.net>
Subject: [VHFcontesting] stacked yagi's
To: vhfcontesting at contesting.com
Date: Friday, April 9, 2010, 11:07 PM



Hey group, 



I'm in the process of stacking two 11 element 70cm yagi's.  I've modeled it in eznec and I think the optimum distance is about 42".  (note that I might switch units without warning). 



Once I have the two 50 yagi's stacked, my model says I need to have one 180 out of phase, does this seem right? 



If that is the case, then I need different lengths of coax to feed each antenna. 



Should I use a 50 ohm power divider and feed each antenna with 1.25w and 1.75w 50 coax, or should I feed with 1.25 and 1.75 75 Ohm coax and simply use a T connecter.  Is there an advantage of one over the other? 



thanks for any help, 73, 

Paul (KG7HF) 
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