[opendtv] Re: Omnidirectional RECEIVE antennas with gain
- From: "John Willkie" <JohnWillkie@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 7 Apr 2005 19:43:18 -0700
Not exactly. I live in the reception area for KTLA, Los Angeles. They -- I
have reviewed the original station file at the FCC with the 1946
authorization -- have authority to transmit up to 5 MW into the sky, but are
limited as to their horizontal ERP to 316 Kw or something like that.
Also, I am of the impression that transmit points are somewhat higher than
most if not all receive points. (Mt Wilson is an extreme example; 5800+ f
amsl, with no home in the receive area higher up than perhaps 2000 f amsl.
Limiting the vertical reception angle would tend to limit the reception
ability of some LA stations. When one compounds the high transmit point,
close-in reception areas, and general lack of null fill in LA TV stations,
restricting vertical reception angle could be an issue.
My preference is an antenna that zeroes in on just the signal that I'm
currently watching. With narrow h and v reception zones, high (or
selectable) gain would be a cinch. However, getting it into a $5.00 antenna
might be an issue.
Heck, limiting vertical reception angle might cause an issue at my current
apartment: I'm less than a mile (horizontally) and 900 feet (vertically)
from the Tijuana transmitters.
John Willkie
----- Original Message -----
From: "Morris Jones" <mojo@xxxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Thursday, April 07, 2005 10:34 AM
Subject: [opendtv] Re: Omnidirectional RECEIVE antennas with gain
> John Willkie wrote:
> > The wider the reception angle, the lower the gain. The narrower the
> > reception angle, the higher the gain.
> >
> > Somehow this escaped you in all your years of education? It was covered
in
> > my first or second semester in a junior college program.
>
> If you narrow the angle vertically, you can still have gain in all the
> directions that matter. You really only care about two dimensions for
> terrestrial RF, after all.
>
> This part must have escaped you. :)
>
> Mojo
> --
> Morris Jones
> Monrovia, CA
> http://www.whiteoaks.com
> Old Town Astronomers: http://www.otastro.org
>
>
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