[opendtv] Re: Louisiana governor blasts faulty wireless networks
- From: Bob Miller <bob@xxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Tue, 13 Sep 2005 14:07:19 -0400
Manfredi, Albert E wrote:
>Craig Birkmaier wrote:
>
>
>
>>Fortunately, a network of COFDM cells could do
>>the job with about 1/10th the power, relative to
>>one big 8-VSB stick.
>>
>>
>
>Unfortunately, Craig, you have yet to back that up with real numbers.
>
>In the (very large) affected region especially, it is really a stretch to
>pretend that small sticks
>would have survived in sufficient number to continue to blanket the entire
>area with signal.
>
>
Not only would small sticks specifically built to withstand hurricanes
be more practical and possible but if you did lose one rebuilding would
be a piece of cake compared to a big stick antenna. NYC took four years
for a patch. Another two or three years for the real thing. An SFN would
have back up and running in weeks or months and would not even have been
affected by a 9/11 unless it had been a wide area affected as in a large
nuclear device.
Bob Miller
>At the same time, those who wax eloquent about the need for spectrum for
>emergency crews would have to
>agree that using up the smallest amount of spectrum for TV is important. And
>for that to happen, you
>need high spectral efficiency. So going to 2 b/s/Hz or less, to support wide
>area SFNs, is not
>necessarily the best strategy even if the multiple towers survived.
>
>A few well placed big sticks, simulcasting a
>multicast of DTT streams, is not a bad way to go in
>this case, especially given the flat landscape.
>
>Bert
>
>
>
>
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