[opendtv] Re: Doug is Missing the Point
- From: "Stephen W. Long" <longsw@xxxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx, opendtv@xxxxxxxxxxxxx
- Date: Mon, 13 Feb 2006 16:13:26 -0500
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.
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
>>> all stations. ...
>>
>>
>>> And WHY won't one antenna work without repointing?
>>>
>>> I have something most people don't, which I installed
>>> in order to have a real, honest, statement such as the following,
>>> and that something is a spectrum analyzer.
>>
>> You have something elsse that the typical consumer does not have:
>>
>> The equipment and ability to screw around with this stuff.
>>
>> What you have described above is one of MANY reasons that ATSC
>> broadcasting has been stillborn in the U.S.
>>
>
>BUT .... since the problem is NOT MULTIPATH, but rather just
>signal level ... COFDM would have the exact same problems
>at a lower bitrate, 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
>> that does not work as well as the system that is being replaced
>> (which did not work well either).
>>
>
>
>But COFDM is no better, unless absolutely vast amounts of
>additional money are spent to generate a much higher signal level,
>over the WHOLE service area, in other words, vast amounts for
>a true SFN.
>
>I suspect, Craig, that you and all others are proposing to
>"cherry-pick" only large metropolitan areas, and to hell
>with far suburbs and rural areas.
>
>Doug McDonald
>
>
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