[opendtv] Re: News: Microsoft, Philips Offer New White Space Test Results

  • From: "John Shutt" <shuttj@xxxxxxxxx>
  • To: "OpenDTV" <opendtv@xxxxxxxxxxxxx>
  • Date: Tue, 2 Oct 2007 10:18:02 -0400

A possibility but it would only make sense to use the ATSC pilot as the
narrow spectrum examined.  It would be hard to imagine such a deep null that
even the pilot was below -114 db, yet the ATSC signal was recoverable a few
feet away.

Like a bullet hitting a bullet.


----- Original Message ----- From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>

The problem with a narrowband detector is that it could be physically
located in a spectral null of the TV signal, which null is caused by
multipath.  If the detector activated a low-power transmitter, the signal
from the low-power transmitter could interfere with nearby TV receivers
outside the multipath-caused spectral null.

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