[opendtv] Re: Doug is Missing the Point
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 13 Feb 2006 20:22:18 -0500
Ian Mackenzie wrote:
> 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.
>
I just thought the above was worth separating and repeating for future
quotes.
- Tom
> =20
>
> 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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> =20
> =20
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