Re: Digital TV quality
- From: "Ken Taylor" <ken@xxxxxxx>
- Date: Wed, 14 Dec 2005 23:15:55 +1300
"Joel Kolstad" <JKolstad71HatesSpam@xxxxxxxxx> wrote in message
news:11pu6nk3tennm4e@xxxxxxxxxxxxxxxxxxxxx
> "Rich Grise" <richgrise@xxxxxxxxxxx> wrote in message
> news:pan.2005.12.13.02.51.38.403182@xxxxxxxxxxxxxx
> > On Sat, 10 Dec 2005 09:21:02 -0700, Luhan wrote:
>
> > The customers would still need a dish, unless your satellite had 100
> > acres of solar panels or a nuclar plant to put out the gigawatts that it
> > would take for your customers to pick up your programs with a dipole.
:-)
>
> The satellite radio guys manage to make do with a low gain patch antenna
for
> the receivers. Granted, it does tend to need to be outside or at least
next
> to a window, and their total bandwidth wouldn't accomodate more than a
> couple of TV channels, and they're supposedly the most powerful satellites
> every put into orbit (XM's is 3kW transmitted -- see
> http://www.spaceref.com/news/viewpr.html?pid=3480), but still -- it'd be a
> start!
>
>
Cough, splutter! That information is almost 5 years old, so "most powerful
ever" is a little outdated now, if it was even accurate then. They
concentrate their power into relatively small data streams over continental
US (and Hawaii and Alaska? Not sure off-hand), so it's not 1/3 of the Earth.
You just can't get enough energy per bit over a hemisphere if you want to
stack lots of bits into the signal. Not with anything we're able to put up
today, anyway. You could put up several satellites and use spot-cells or
beams, but even then....
Ken
.
- References:
- Digital TV quality
- From: Joerg
- Re: Digital TV quality
- From: Luhan
- Re: Digital TV quality
- From: Rich Grise
- Re: Digital TV quality
- From: Joel Kolstad
- Digital TV quality
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