[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 21:11:47 -0700 (GMT-07:00)
what in the heck is a mobile application?
8-VSB is NO PROBLEM with data applications, and little to no problem with
audio. I guess you are talking about synchronized or synchronous video
applications using legacy codecs.
I have yet to see the ITU authorize the use of U.S. TV bands for mobile
applications, so at best it's an ancillary use. Of course, the DOD doesn't
need to worry much about that, but broadcasters do, until and unless you take
over their transmitters on that bad day. Broadcasters, in their planning, pay
little attention to the desires of the DOD. At least in this country.
But, how much electricity will be available on a bad day? Might it be that
electricity will be in short suppy? Or, is this just a moderately bad day, or
a bad day far away that you can enjoy in HDTV from your living room? Will
people be driving around in their cars at 60mph watching video coverage on this
bad day?
In that latter case, 8-VSB reception would be a problem. As would the laws in
all 50 states that forbid watching tv while driving.
John Willkie
-----Original Message-----
>From: "Stephen W. Long" <longsw@xxxxxxxxxxxxxx>
>Sent: Sep 21, 2006 3:25 PM
>To: opendtv@xxxxxxxxxxxxx
>Subject: [opendtv] Re: Which Modulation Would You Choose on a really bad day?
>
>The 3db does not exist in the real world, the echoes do. So, you think it
>is acceptable that no mobile applications can receive 8VSB?
>
>-----Original Message-----
>From: opendtv-bounce@xxxxxxxxxxxxx
>[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Doug McDonald
>Sent: Wednesday, September 20, 2006 5:06 PM
>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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