[opendtv] Re: Demand for free DTV rising in Australia

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Sat, 23 Jun 2007 10:38:14 -0400

At 4:11 PM -0400 6/22/07, Manfredi, Albert E wrote:

John Shutt wrote:


 At the 2000 NAB, Sinclair used HM-COFDM to delivered 13.6 Mbps
 to fixed receivers on the exhibition floor using indoor
 antennas, and simultaneously delivered 4.5 Mbps to a portable
 Nokia Mediascreen that worked everywhere in Las Vegas,
 including in a car traveling at well over the legal highway
 speed limit, and could only be made to fail when shut inside
 of a transmitter cabinet.

 At the 2007 NAB, A-VSB delivered 14 Mbps to fixed receivers
 and 500 Kbps to mobile receivers that never broke 25 MPH.


Question 1: Did you do a C/N margin comparison? If not, why not? What
are we comparing here?

Question 2: Did the mobile test try highway speeds for A-VSB? If not,
why not? What are we comparing here?
The Samsung R&S A-VSB mobile demo did get onto a freeway and I would guess the spped was up to 45-50 MPH. This did not cause any major problems - perhaps a few more break-ups for the less robust constellations that were demonstrated. 

Regards
Craig


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