[opendtv] Re: DEA-what? was: Re: Re: News: DIRECTV Sued Over HDTV Picture Quality
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 22 Sep 2006 15:31:02 -0400
Craig Birkmaier wrote:
> The way to provide proper redundancy is to have a network
> with a small number of towers in each market that provide
> real redundancy. IF New York City were covered by 4-5
> transmission sites, each of which carried all of the
> frequencies used in that market, it would not be possible
> to knock out the digital network by taking down a single
> building.
That's one possibility, although I do not think it's the best one. And
here is why.
If you design a system from scratch such that multiple towers are
required to cover the area in unison, and this is a commercial
enterprise, your goal is to make the system as efficient as possible.
NOT as survivable as possible.
So the commercially optimized system won't cover the market adequately
when some of those towers are taken out. Uunless maybe, if you
simultaneously reduce spectral efficiency, perhaps the remaining towers
can still over the area. But perhaps not. It all depends where you
started, and how easy you had made the job for receivers previously.
Whereas a scheme that already includes several towers which individually
can cover the area would have an advantage. And in an emergency, the
multiple big sticks can be made to transmit simulcasts. So even if they
have to reduce ERP, the entire area may still have coverage, with no
loss of spectral efficiency.
Even in NYC, where the local transmitting antennas are co-located, can't
stations from neighboring NJ also be received?
> Equally important, these sites WOULD NOT need to use big
> sticks or high power levels, which makes siting far easier.
That's always a possibility. You can always add low power transmitters
after the fact.
Bert
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