[TowerTalk] Stacking]

[E. Glenn Wolf, Jr.]

Posted to test a solution to a problem... the post is valid but it is
from  Jay Terleski <wx0b@arraysolutions.com>




Steve,

Very good question and one I wanted to know the answer too a few years
ago.

I wanted to know if in a 3 high or 2 high stack what really happens when
I rotate one beam 45,90 and 180 degrees around the tower.  Will there be
cancellation of desired forward lobe.
And will these combinations actually help beaming in two desired
directions.

Modeling these situations proved that the patterns are as expected for
properly stacked and phased antennas. In my presentation that I have
been giving over the last couple of years, I demonstrate this.  You can
widen the pattern, you can beam in two directions of any azimuth, and
you can even take the stack 180 degrees out and beam in opposite
directions.  Very useful here in TX when Japan and South America both
come in at the same time.

Jay, WX0B

nn4t@bellsouth.net wrote:

I apologize if this topic has been discussed before, but I don't
remember it coming up. I have modest stacks of monobanders for 10, 15
and 20 on separate towers. On each the top antenna rotates while the
lower is fixed on Europe. When running Europe I always try to align the
antennas as best I can. My assumption is the better aligned the
antennas, the better the pattern. My question is, how critical is this
alignment? Is there a point where some cancellation/degradation of the
pattern begins to take place? Or would having one antenna at 30 degrees
and the other at 55 give you broader coverage to the various countries
of Europe? Thank you. Steve, NN4T.




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