[opendtv] Re: MIMO

Dale,
How is it possible to have a circularly polarized omnidirectional signal? You can have a dual horizontal and vertical polarized high power UHF television transmission antenna, which is what passes for "CP" in the broadcast world, (or if the power ratio is not 1:1 it is called "elliptical" as you correctly pointed out,) but you never see a spec in the Dielectric or Andrews (R.I.P) catalogs for a "Left Hand" or "Right Hand" circular polarization of their UHF antennas. They just list the horizontal to vertical ratio.
DBS uses a true circular polarization, as does some forms of radar, but in both cases the radiation is highly directional. 

John
----- Original Message ----- From: "Dale Kelly" <dalekelly@xxxxxxxxxxx> 



This is actually known as elliptical polarization. Many antenna do use a
degree of elliptical Pol. and off handedly it is sometimes called CP.
However, there are also a number of true CP installations, though I believe 
that elliptical is clearly in the majority and they do also improve
reception but to a lesser degree. It's an economic trade off.






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