[opendtv] 5th-generation test

  • From: Mark Schubin <tvmark@xxxxxxxxxxxxx>
  • To: Open DTV Forum <opendtv@xxxxxxxxxxxxx>
  • Date: Thu, 05 May 2005 11:25:30 -0400

Bob Miller brought over the latest version (I'm not permitted to say 
whose).  It was much better than last time (comparable to a good 
4th-generation rather than not as good as a second generation, as the 
last one was) but still nothing like the 5th-generation LG.

With a loop antenna, it seemed to be sensitive to us moving around the 
room.  With a Silver Sensor, it didn't seem to be, but different antenna 
orientations brought in different stations.

In all of the tests, we could get WNBC-DT, WWOR-DT, and WFUT-DT 
solidly.  Depending on antenna and orientation, we could also get 
one antenna position and orientation, the receiver sniffed WFME-DT, but 
it did not appear to decode anything.  I'm not certain that was a DTT 
problem.  The receiver crashed once, and once wouldn't decode WABC-DT 
audio until the channel was changed and changed back.  It's also 
possible the station wasn't transmitting any pictures.

Regarding numbers of channels, WNBC-DT, WNYW-DT, WABC-DT, WWOR-DT, and 
WPIX-DT were all multicasting two programs.  WNJN-DT was multicasting 
six channels.  WFME-DT appears to have been multicasting ten channels 
(it was the last time we received it, too).  So, counting minor 
channels, the receiver sniffed out at least 29 "channels."

Performance degraded the farther the antenna was from the window.

There did not appear to be much of a correlation between the "signal 
strength" reading and reliability (except that when we got a signal 
strength of zero we got nothing).


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