[TowerTalk] Method of calculating phase delay variation when stacking two dissimilar yagi antennas?

[Mark Beckwith]

> So my question at this moment is - which is the
> proper method for me to calculate the proper
> delay line length to properly phase the two
> dissimilar SteppIR yagis?


This is not meant to be a snarky or otherwise "cute" response.  Just more 
like a reality check.  The answer is:

Feed them with equal length feedlines and see how they play.  If you like 
the way they work, then you're done.  I suspect you will like the way that 
they work and I also suspect changing one feedline length by as much as 8 
feet would not affect your overall conclusion.

Neither the WX0B formula or the WN9O formula accounts for imbalance caused 
by the dissimilar feedpoints (even if the feedpoints were identical in every 
other respect, one is still closer to the ground than the other) - meaning 
there are undoubtedly unknowns in the mix which from the seat-of-my-pants 
means it may largely be an academic question, likely trumped by actual 
implementation.

Get on the air and work guys. I bet you work more guys with two antennas at 
you disposal than just one antenna, and I bet when you do 
top-bottom-bip-bop* tests you will find some times when some stations are 
lounder under some of those four conditions.  I suspect this would be the 
same conclusion whether your coaxes are the same length or different lengths 
by 4 feet or 8 feet.

This is what I would do anyway, and what I have found to be true in the past 
when stacking dissimilar tribanders in real life™.

73 - Mark, N5OT

* Top antenna alone, bottom antenna alone, both antennas in phase, both 
antennas out of phase