[opendtv] Re: Freeview business model
- From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 28 Jan 2007 15:40:37 -0800
Tom;
The "technical" term is combining, and the power "savings" can be NEGATIVE
50% for each due to the power loss through the combiner.
The savings are in tower, maintenance, antenna/transmission line/rigging
costs, and receive antenna orientation issues.
It's not that antennae don't need to re-oriented, but the re-orientation
usually has to do with degrees off the horizontal (roll?) and not azimuth.
John Willkie
> -----Original Message-----
> From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
> On Behalf Of Tom Barry
> Sent: Sunday, January 28, 2007 2:22 PM
> To: opendtv@xxxxxxxxxxxxx
> Subject: [opendtv] Re: Freeview business model
>
> Is there any power savings when modulating 2 similar channels on a
> single antenna as opposed to two antennas?
>
> - Tom
>
>
> Dale Kelly wrote:
> >>Dale Kelly wrote:
> >>
> >>>Nothing akin to this system exists in the U.S. and
> >>>suggesting that broadcasters construct one from scratch
> >>>at this late date, though a noble idea, seems is a bit
> >>>Quixotic.
> >
> >
> > Bert answered:
> >
> >>Although even with the US approach to OTA broadcasting, there are plenty
> >>of examples of broadcasters sharing a tower. And I still think that it's
> >>not completely unreasonable to expect OTA broadcasters to pay attention
> >>to each other's program offerings, and try to create an attractive OTA
> >>network.
> >
> >
> > Yes, the sharing of towers in the U.S. is not uncommon but it is clearly
> not
> > the norm. However, the sharing of an antenna by individual broadcasters
> is
> > unusual and the sharing of a single antenna by an entire market* is
> > extremely rare, if done at all.
> > You will note that in the UK system, all stations share a single antenna
> and
> > therefore have virtually the same pattern. That is doable when a system
> has
> > only five or so channels, all are in the same band (UHF in this
> instance)
> > and are selected for single antenna compatibility (frequency and power
> > output).
> >
> > There are many impediments to implementing such a scheme in most U.S.
> > markets, i.e., split V/U channel assignments, many channels that can not
> be
> > collocated and/or require different patterns to protect other channel
> > assignments. For a Freeview type service to be viable, participating
> > stations must be generally collocated and must provide similar coverage.
> > Under current conditions this might be done in some markets but would be
> > difficult (and very costly) or impossible in others.
> >
> > That being said, I agree with your suggestion that it is a worthy effort
> now
> > that an adequate receiver design seems to be available and assuming that
> the
> > service could actually obtain an attractive programming package. Which
> has
> > so far not been available to USDTV and will which be guarded carefully
> by
> > current multi channel service providers
> >
> > * - The LA market now has a seven station common UHF DTV antenna on Mt.
> > Wilson which and was cleverly designed by Merrill Weiss to accommodate
> > stations requiring different ERPs and/or different antenna patterns. It
> > shares a new tower with our LA station and is currently operational,
> however
> > I don't know how well it performs relative to design but knowing
> Merrill, I
> > assume all is well. It is clearly a very expensive design but is a
> relative
> > bargain when shared by seven stations.
> >
> > The LA market has about 20 stations, with ~16 located on MT. Wilson and
> > seems a potential for a Freeview type of service, if it includes
> sufficient
> > Spanish programming content or, perhaps even mostly Spanish content...
> >
> > Dale
> >
> > The Dale who will no longer chide Craig for his verbosity!
> >
> >
> >
> >
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>
> --
> Tom Barry trbarry@xxxxxxxxxxx
> Find my resume and video filters at www.trbarry.com
>
>
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