[opendtv] Re: Louisiana governor blasts faulty wireless networks
- From: "John Willkie" <JohnWillkie@xxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 25 Sep 2005 20:32:22 -0700
You are at least 180 degrees out, but then you're a whore on this subject,
and have zero practical experience.
Each tower you construct costs money. Indeed, it's not that much more
expensive to construct a tall tower in comparison to a small one (the price
increases are largely non-linear). However, a sturdy short tower -- one
that can withstand a 225 mile wind (a design criteria for many) -- could
even end up being more expensive than a tall tower, unless all sites are
equal.
Maybe you should hook up with bert and talk about marine structures,
hydrology and storm surges.
John Willkie
----- Original Message -----
From: "Bob Miller" <bob@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Tuesday, September 13, 2005 11:07 AM
Subject: [opendtv] Re: Louisiana governor blasts faulty wireless networks
> 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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