[opendtv] Re: COFDM and equalization

--- Craig Birkmaier <craig@xxxxxxxxx> wrote:
> At 6:35 AM -0700 4/20/04, Doug McDonald wrote:
> 
> >  Our town is an
> >excellent example: we are right on the boundary
> >of a certain Fox dtv station, and 3 dB really
> >does make a big difference: > As I recall that
station is not licensed to serve
> your market.
> 
> More power just means that their signal will
> encroach on more ares 
> that are not in the market for which the station is
> licensed.
> 
> If my recollections are incorrect, I apologize in
> advance.
> 


It most certainly is licensed to serve this market,
Champaign-Decatur-Springfield. Our market is
long and thin, it's at one end, we are at the
other. The owners have a station way beyond us,
even farther at the other end, which would serve
us better if it were on ... but it is simply
a mirror of this one, they have absolutely
identical programming, even the local stuff
comes from the Springfield end.

In any case, "market" means a different thing out here
than in the East where you are: out there 
markets are smaller than the Grade B contours
of stations, here they are much larger ... 
there are substantial areas even in a state
like Illinois that are essentially unserved by
analog TV. At full power they will be served
by ATSC.

Interference is simply not an issue at all. 
In the absence of tropo, where I live, with
a reasonable antenna, we get grade A analog signals
from chs. 3, 12, 15, 17, 23, and 27. There are
low power ones, none grade B where I live, though
within 8 miles (!), on 7, 39, 46, and 58. With
a good antenna you can also get (from the other
end of the same market) 20 and 55. There are other
LPs in the market, but they are not visible at all
except under the most stong of tropo, except for
occasionally a 29. 

There are NO out of market stations visible at
all analog, period, here, without tropo.
Not even the slightest hint. 

With tropo we used to get a channel 18 from 
Lafayette IN, but that is now covered up by
local digital 18. We also get analog ch.
20 from Indy with a big tropo event. This needs
a really good F/B antenna to get watchable pictures
because the tropo enhances the nearby (70 miles) 20
too. That's the only analog interference case,
and it is completely negligible if you point
at the in-market 20 with an antenna that give 
a good picture without tropo. 

Digital, our stations are 48(3), 9(not on yet)(12), 
41(15), 18(17), 23(22), 26(not on yet)(27). In the
absence of the digital, even with tropo, no analog
was visible on any of those channels before digital
came in, except 18.

We will also eventually get a Grade B 51 (50 digital).


Interference here is simply not a problem, except for
20, which is identical to 15 except for local news
(the only station with a different program on two
transmitters at two ends of the market.) 

All more power does around here ... and in the west
in general ... is serve more people.

Doug McDonald   






=====
Doug McDonald
my last name at scs dot uiuc dot edu, not here at Yahoo, please


        
                
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