[opendtv] Re: News: TV Braces for the Apple Tablet
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 4 Feb 2010 10:10:00 -0600
Craig Birkmaier wrote:
> In many markets a configuration like Berlin could work. It
> all depends on the geographic isolation of the market. In
> the N.E. corridor the markets are too dense and too close
> together. But these markets have many more viewers, so the
> revenues exist in these markets to build out a more elaborate
> network with better spectral reuse.
I think you continue to blow smoke. The fundamental point is that SFN or not,
if you need to cover large but individual market areas, you need to protect the
frequency in adjacent markets. If the market is isolated and you don't need
continuous coverage beyond the market boundaries to the next market, then
obviously, big stick or SFN, that problem won't exist. You can reuse ther same
frequency in the next market over, putting up with interference between the two.
The real savings in frequency usage of SFNs occurs if they go beyond the size
of a single market. Exactly what Qualcomm has to deal with, given the fact that
they only had Ch 55 available to them. So for that, the price you pay is a much
denser mesh of towers. You need that, to put a strong signal in zones that
would otherwise experience interference. This is probably similar to what
Jeroen describes in the Netherlands.
Unlike Berlin's Channel 44, Paris and Rome are good examples of low power big
sticks, SFN, and the need to install translator sites close by, to avoid having
to install the dense mesh of a single wide area SFN. This might be more like
your SFN concept. But pay attention:
Paris has a diamond shape SFN, with the Eiffel Tower big stick on the West side
of the diamond, 25 KW, and then three 1 KW small sticks making up the rest of
the diamond. To provide continuous coverage beyond Paris proper, scarcely 30
miles West from the Eiffel Tower you'll find the first set of *translator*
sites. So as you can see, not much different from the big stick model at all,
except that you'll get more robust reception in Paris proper.
And none of these examples are ATSC, Craig, so you can't use that excuse to
pretend like there's some magic possible here that we're missing out on.
Bert
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Other related posts:
- » [opendtv] News: TV Braces for the Apple Tablet- Craig Birkmaier
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- » [opendtv] Re: News: TV Braces for the Apple Tablet- Craig Birkmaier
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- » [opendtv] Re: News: TV Braces for the Apple Tablet- Craig Birkmaier