[opendtv] Re: Which Modulation Would You Choose on a really bad day?
- From: John Willkie <johnwillkie@xxxxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Thu, 21 Sep 2006 21:28:24 -0700 (GMT-07:00)
falta: (WRONG)
ATSC countries (actually transmitting, as we speak)
U.S.A; Canada Mexico, S. Korea. NO COFDM. Taiwan (not exactly a country) is
an ATSC country, but I don't think they're doing much 8-VSB there.
That's -- depending on how you count -- four or five ATSC countries. With the
exception of S. Korea and Taiwan, they're also countries where the government
doesn't control most (or everything) in media.
not a mere coincidence, I'd say.
There are more commercial HDTV stations operating in Tijuana, Mexico today than
there will be testing facilities in Paris in short order. More HDTV stations
in Tijuana, Mexico than there are in all of Europe. That is, there are two,
with a third in short order. And, they've only just begun on the 18 year
transition to digital in Mexico. (There are other DTV stations in Mexico.)
John Willkie
-----Original Message-----
>From: Ian Mackenzie <ian@xxxxxxxxxxxxxxxxx>
>Sent: Sep 20, 2006 8:29 PM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: Which Modulation Would You Choose on a really bad day?
>
>If I wasn't having a bad day before choosing ATSC I
>Certainly would be afterwards.
>
>The whole world except 2 countries uses COFDM
>in one form or another for DTT.
>
>Can't you see who's out of step Doug?
>
>-----Original Message-----
>From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
>On Behalf Of Doug McDonald
>Sent: Thursday, 21 September 2006 7:06 AM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: Which Modulation Would You Choose on a really bad
>day?
>
>To reply to the subject line,
>
>I would choose whichever system gave the most bits at with the least
>problems with digital into digital co-channel and adjacent channel
>interference.
>
>This chooses ATSC over DVB-T.
>
>The reason is simple. A really bad day is one in which tropo ducting is
>strong. This fairly frequently causes, where I live, bad adjacent
>channel interference and more rarely co-channel. The 3 dB interference
>advantage of ATSC can really help.
>
>Doug McDonald
>
>
>
>
>
>
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