[opendtv] Re: MIMO
- From: Ron Economos <k6mpg@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 01 May 2007 01:43:32 -0700
Google for "Lindenblad antenna".
Ron
John Shutt wrote:
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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