[opendtv] Re: Interview: ARE MANY TRANSMITTERS BETTER THAN ONE?
- From: "Albert Manfredi" <bert22306@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Sat, 15 Sep 2007 17:23:14 -0400
http://www.tvnewsday.com/articles/2007/09/13/daily.4/
TECH ONE OF ONE WITH MERRILL WEISS
SFN: ARE MANY TRANSMITTERS BETTER THAN ONE?
TVNEWSDAY, SEP. 13, 9:04 AM ET
I thought this was a refreshingly, and uncommonly, well written and
hype-free article.
In particular is this quote:
Now, just to be complete, there are some locations where there's
some amount of interference between the two signals and it
actually makes it a little worse.
You have to be aware of that when you build one of these
networks, what you're doing is balancing the gains versus the
losses. You try to gain a lot and lose only a few. And you try and
do it in a way that the few can still receive a signal, if they use a
directional antenna.
As discussed many, many times on this list, SFNs with 8-VSB are possible,
but if you want to install more than just gap fillers, you really depend on
active synchronization of the transmitters. Once that technique has been
mastered, and Doug McDonald explained the basic concept eons ago, then you
pretty much deploy SFNs with the same caveats as any other modulation
scheme's SFN deployment. As the quote above explains, everything is a
compromise. (Seems a difficult point to get across.)
Bert
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