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

[john at kk9a.com]

If my model is correct, changing the phase of one yagi 20 degrees makes
very little difference in the gain or pattern.

John KK9A


To:	towertalk at contesting.com
Subject:	 Re: [TowerTalk] Method of calculating phase delay variation when
stacking two dissimilar yagi antennas?
From:	 Jim Lux <jimlux at earthlink.net>
Date:	 Sun, 01 Sep 2013 10:22:23 -0700


Here's the deal..
For phased arrays you can have fairly large phasing errors and the *gain*
doesn't change much. What changes is the depth and position of the nulls.
So the whole deal on the BIPBOPTOPBOT thing is that you're moving the
nulls around to suppress the stations you don't want to hear, while
slightly changing the gain in the directions of the stations you DO want
to hear. (for that matter, most likely, what you're doing is moving the
null OFF of the desired station).