[opendtv] Re: Which Modulation Would You Choose on a really bad day?
- From: "Ian Mackenzie" <ian@xxxxxxxxxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Fri, 22 Sep 2006 19:45:56 +1000
Obviously Mexico and Canada have to use
whatever the US chooses.
Basically the USA and S.Korea are the
only takers for ATSC
As to HD there are 5 networks with over 80
Stations transmitting full time HD in Australia.
They have been for some time and more are coming
On line all the time. (not counting translators,
repeaters and gap-fillers).
HD on satellite in Japan and Europe is also something
That's been operating for some time.
One doesn't have to give excuses as to whether COFDM
will work in mobile or handheld, city, suburban or
urban environments, it just does.
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of John Willkie
Sent: Friday, 22 September 2006 2:28 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: Which Modulation Would You Choose on a really bad
day?
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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