[opendtv] Re: Doug is Missing the Point

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Stephen W. Long wrote:

Doug is still missing the point.  With COFDM you can implement Single
Frequency Networks, using much lower power transmitters in locations
much closer to the actual consumers/viewers.  8VSB requires big stick
mentality, since it does not do SFN (as part of its primary business
activities).  I would assert that a COFDM system would provide HIGHER
signal to noise than 8VSB because the transmitters could be located
where the people are.

This is where Doug doesn't understand what COFDM is all about.
Why put an "Earth Scorcher" in a remote location to cover a population
density that probably meant 10 watts or more per viewer when a COFDM
SFN transmitter nearby will give better coverage.
The use of "Gap Fillers" or on-channel repeaters allows a much better
way of covering vast areas efficiently.
In Australia we have areas with far fewer people per square mile than
the USA and guess what? They all can get network HDTV.=20
Some get it from high power stations just like ATSC.
Some get it from COFDM SFN transmitters.
Some get it from gap fillers as is common in Spain and other=20
European countries.
And some can get it by satellite where as a last resort where the cost
of installing and running a transmitter in to serve maybe ten people=20
in an area of thousands of square miles would not be feasible
with any transmission system.

Also, I have yet to hear any meaningful conversation about the wasted
bandwidth (wasted channels) required by 8VSB to support translators in
remote areas (following the current analog model of a big stick with
remote translators on separate frequencies).  With COFDM, a television
station could transmit using their big stick and then have their
repeaters (not translators now) use the same frequency.  Here in the
Washington Metro Area, all of the PBS stations (Maryland Public TV,
etc.) that have several translators, could sit on a single frequency
(and also improve channel identification).

In rural America, where does the wasted bandwidth required for different
frequencies for 8VSB and translators get calculated in the bit per Hertz
calculation?

Stephen Long

At 12:12 PM 2/13/2006 -0600, Doug McDonald wrote:
>Craig Birkmaier wrote:
>> At 12:02 PM -0600 2/12/06, Doug McDonald wrote:
>>> I have to use three different indoor antennas where I live to get=20
>>> all stations. ...
>>=20
>>=20
>>> And WHY won't one antenna work without repointing?
>>>
>>> I have something most people don't, which I installed in order to=20
>>> have a real, honest, statement such as the following, and that=20
>>> something is a spectrum analyzer.
>>=20
>> You have something elsse that the typical consumer does not have:
>>=20
>> The equipment and ability to screw around with this stuff.
>>=20
>> What you have described above is one of MANY reasons that ATSC=20
>> broadcasting has been stillborn in the U.S.
>>=20
>
>BUT .... since the problem is NOT MULTIPATH, but rather just signal=20
>level ... COFDM would have the exact same problems at a lower bitrate,=20
>and worse problems at the same bitrate!!!
>
>
>> It is absurd to believe that U.S> television broadcasters can survive

>> with the current business model and a retro transmission technology=20
>> that does not work as well as the system that is being replaced=20
>> (which did not work well either).
>>=20
>
>
>But COFDM is no better, unless absolutely vast amounts of additional=20
>money are spent to generate a much higher signal level, over the WHOLE=20
>service area, in other words, vast amounts for a true SFN.
>
>I suspect, Craig, that you and all others are proposing to=20
>"cherry-pick" only large metropolitan areas, and to hell with far=20
>suburbs and rural areas.
>
>Doug McDonald
>=20
>=20
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