[opendtv] Re: Mobile DTV test
- From: "John Willkie" <jmwillkie@xxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Wed, 21 Apr 2004 23:37:13 -0700
Sure, the signal levels are better-maintained in the U.K.; TV there ain't
exactly commercial, either, and citizens tend to anticipate being served if
they're being taxed. Convincing economic actors that they need to decrease
their transmitter power to better serve viewers reminds me of being in the
LPTV field.
There are LPTV DTV stations and translators in the U.S.: Paul H. has talked
of several that he is personally involved with.
I would also offer that there are more than 80 TV transmitters in Oregon,
when one considers LPTV and translators. (British "transmitters" are
essentially what people in the U.S. call "translators", and those 80
transmitters handle just five national channels, and the fifth ain't exactly
a national service, last time I checked.
John Willkie
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx
[mailto:opendtv-bounce@xxxxxxxxxxxxx]On Behalf Of Eory Frank-p22212
Sent: Wednesday, April 21, 2004 11:00 PM
To: 'opendtv@xxxxxxxxxxxxx'
Subject: [opendtv] Re: Mobile DTV test
John Willkie wrote:
>Frank;
>
>By what measure of density does the U.K. have more transmitters than the
>U.S.? Last time I checked, there were 1600 or something full service
>transmitters in the U.S., and more than 5K translators/lptv. The average
>british tv station is slightly more powerful than the average U.S. LPTV.
>
>John Willkie
By this measure: In late 2002, there were 80 DTV transmitters in the U.K.
This is in a country that is slightly smaller than the state of Oregon.
Perhaps our British colleagues can update us on the latest number, which may
be larger since the Freeview launch.
In the U.S., there will eventually be 1600 DTV transmitters -- still a lower
density per square mile compared to the U.K. -- but so far no LP-DTV
translators. Your observation that the average British TV transmitter is
only slightly more powerful than the average U.S. LPTV transmitter further
demonstates a point I have made several times in the past -- the need for a
well-engineered DTV broadcast infrastructure. The U.K., with lots of "medium
sticks" is a lot closer to that goal than the U.S.
Regardless of the merits of one modulation scheme vs. another, the fact is
the U.K. has a much more uniform DTV field strength. In the U.S., with our
geographically sparse mega-stick transmitters, it's easy to go from tuner
overload to unusably weak signal within the same metropolitan area. That is
not the ideal way to operate a broadband wireless digital communications
link, no matter what modulation you are using.
-- Frank
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