When you are talking about different antennas, exactly what could that mean....
5el/20M and a 4el/20M or
different multi-band antennas
or what??
On 10 Mar 2007 at 9:48, Michael Keane K1MK wrote:
> 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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Jim/KC4HW
http://www.AlabamaContestGroup.org
http://www.AlabamaQSOParty.org (June 2nd and 3rd, 2007)
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