[opendtv] Re: VHF Stations Seek Solutions for Reception Problems, by Doug Lung

  • From: "Dale Kelly" <dalekelly@xxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Wed, 01 Jul 2009 15:27:55 -0700

Good find, I've contacted Wade's U.S. subsidiary company
(sales@xxxxxxxxxxxxxxxxxxxxxx) for price and availability. As you surmised,
it probably will be expensive.

During my research I also learned much about helical antennas. I had made a
couple of invalid assumptions.

 -----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]On
Behalf Of Ron Economos
Sent: Tuesday, June 30, 2009 5:23 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: VHF Stations Seek Solutions for Reception Problems,
by Doug Lung


Helical TV antenna. Probably not cheap.

http://www.wade-antenna.com/Wade/WH14-69.pdf

Ron

Dale Kelly wrote:
I believe, but am not certain, that the only true CP antenna is helical in
nature and wouldn't be broadband. Perhaps it could be broadband to some
degree by increasing the size of the coils over the length of the antenna,
something like a log periodic antenna, though it would surely reduce the
gain.

I searched Google for the available of CP TV receive antennas but struck
out. Seven years ago I constructed a full power CP UHF station on Mt. Wilson
in the LA market and was able to purchase commercial grade high gain CP*
antennas to resolve cable reception issues but I can not find any such
product available today.

* = These were panels that incorporated simple vertical and horizontal
elements, as do most UHF broadcast antennas, and they worked very well.

-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Manfredi, Albert E
Sent: Tuesday, June 30, 2009 3:25 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: VHF Stations Seek Solutions for Reception
Problems, by Doug Lung


Thanks, Dale.

Cliff Benham wrote:

  Does this also mean that a circularly polarized receive antenna is
also a *single channel* antenna as well?

Aha. I think I see what you're asking. Like, can CP antennas be used for
transmitting MIMO-like signals. Sounds like no is the answer. For that,
you want the maximum possible isolation between the polarities. Here,
ideally, they would be identical and just phase-shifted.

Bert

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