At 09:20 PM 3/9/07, Cqtestk4xs@aol.com wrote:
>I know there may be a phasing difference, but I will be running
>identical lengths of
>coax to them, so I'm not sure where the phasing difference that guys mention
>in this stacking comes from.
No, that's not it. The phasing concern with stacking dissimilar
antennas is that the "zero phase" point the antennas will be in
different positions horizontally. That requires an additional section
of "delay line" be inserted into the feed path to one or the other
antenna to bring them into phase.
The phase difference can be modeled or it can empirically determined
(see: <http://www.arraysolutions.com/Products/dissimilarants.htm>).
73,
Mike K1MK
Michael Keane K1MK
k1mk@alum.mit.edu
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