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[Discuss-gnuradio] SBE CHAPTER 40 NEWSLETTER and DTV
[Discuss-gnuradio] SBE CHAPTER 40 NEWSLETTER and DTV
Tue, 26 Mar 2002 14:42:55 -0800
If folks are interested in DTV technical issues, you may want to
subscribe to teh SBE Chapter 40 newsletter. Good pointers...
----- Forwarded message from Tim Pozar <address@hidden> -----
From: Tim Pozar <address@hidden>
Subject: [Sbe-announce] SBE CHAPTER 40 NEWSLETTER - MARCH 2002
Date: Tue, 26 Mar 2002 14:30:46 -0800
SBE CHAPTER 40 NEWSLETTER
Roy Trumbull - Editor address@hidden
Bill Dempster - Artist
Advertisers for this month's newsletter are:
Zack Electronics - Judi Lomas - (888) 329-0225
Advanced Marketing - Frank A. Santucci - (650) 365-3944
Belden - Steve Lampen - (415) 440-8393
Orban - address@hidden - (510) 351-3500
MARCOM - Martin Jackson - (408) 768-8668
William F. Ruck, Jr. Broadcast Engineer - (415) 564-1450
Audio Accessories - Rosie Alexander - (510) 787-3335
Kathrein (Scala Division) - Michael Wm. Bach - (541) 779-6500
Hammett & Edison, Inc. - Dane E. Ericksen, P.E. - (707)
LeBLANC - David A. Hill - (650) 574-4600
Gentner Communications - Kelly Hanning - (800) 879-9317
Improbable Missions Fource - Mike Schweizer - (888) 4-ISDN4U
Econco - George Badger - 650-327-7599
RF Specialties of California - Bill Newbrough - (888) 737-7321
ADC - Russ Erickson - (877) 440-7877
Enco Systems - Steve Rooney - 800-ENCO-SYS
Babes/SBE Luncheon on Wednesday Mar 27th
This month we'll have a presentation about the BMS Microwave
Carry-Coder which is a COFDM box. These units are know for
staying locked while the transmitter is in motion.
As usual, our luncheon will be at Sinbad's just south of the
Ferry Building on the Embarcadero near the foot of Mission St. We
meet at 11:30 and are seated at 12:30. To make reservations call
Paul Black at 925-827-9511 and leave a message on his machine.
SMPTE iBlast Meeting
This month there will be a SMPTE meeting March 28th at the Garden
Room of the RoundTable Pizza in Menlo Park, 1225 El Camino at Oak
Grove Av. Buy your own dinner from 6:30 - 7:30.
Peter Lude' of iBlast will talk about using DTV data transmissions
for internet connections thereby getting around the bottleneck of
the internet server farms. The internet will be as close as a
receiver card in your PC. Recent improvements in DTV receivers,
8VSB demodulation technology, antennas, and software applications
are allowing the creation of a wireless data broadcast infrastructure.
Within the last few months, the first thousand end-users have
subscribed to various datacasting services across the country, with
strong growth projected in the next several years.
Lo-Band TV and DTV
There are only two lo-band DTV stations on the air in the U.S. They
are WKYC in Cleveland and WBBM in Chicago. At the ATSC web site
(www.atsc.org) there is a paper dated Dec, 2000 of a study to
compare 8VSB to COFDM. One of the tests was done at WKYC. The 8VSB
did better than COFDM because COFDM gets killed by impulse noise
and the lo-band is loaded with it. That said, there were a surprisingly
low number of test sites that received either signal in comparison
to the other three studies that involved UHF stations. It remains
to be seen if lo-band is viable at the power levels granted by the
Last year at the fall IEEE conference a paper was given entitled:
"DTV Coverage and Service Prediction, Measurement, and Performance
Indices". Its authors were Oded Bendov, John F.X. Browne, Charles
W. Rhodes, Yiyan Wu, and Pierre Bouchard. It seriously questions
whether the planning factors used by the FCC for DTV are realistic.
Oded Bendov of Dielectric has questioned the noise figures used by
the FCC and in particular the wisdom of ignoring galactic noise
sources that are prevalent at VHF.
In a talk I heard by Browne in Canada about 1997, he was the first
to raise the planning factor issues and was kind enough to copy
many documents for me.
Charles Rhodes was the chief scientist at the ATSC test center in
Charlotte, NC. He is concerned about the effects of mismatch between
the antenna and receiver effecting the required carrier to noise
Wu and Bouchard are scientists from the Communications Research
Centre in Ottowa who have given papers over the past 2 years about
their extensive testing of receivers and reception conditions.
If this august group of scientists and engineers says there's a
problem, then there's a problem.
Subscribe to the online version of the newsletter
The electronic copy version of this newsletter is now availible via
a mailling list. You can subscribe by going to
http://www.lns.com/mailman/listinfo/sbe-announce and filling
out the form there.
Webmeister Tim Pozar has the current newsletter plus newsletters
all the way back to 1996 at: http://www.lns.com/sbe
Sbe-announce mailing list
----- End forwarded message -----
Snail: Tim Pozar / LNS / 1978 45th Ave / San Francisco CA 94116 / USA
POTS: +1 415 665 3790 Radio: KC6GNJ / KAE6247
"It's a damn poor mind that can only think of one way to spell a word."
- Andrew Jackson
"What is wanted is not the will to believe, but the will to find out,
which is the exact opposite." - Bertrand Russell, "Skeptical_Essays"
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