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

  • From: Craig Birkmaier <craig@xxxxxxxxx>
  • To: opendtv@xxxxxxxxxxxxx
  • Date: Mon, 15 Oct 2007 09:15:57 -0400

At 12:05 PM -0400 10/3/07, John Shutt wrote:

I believe your testing in DC, because I've seen it here in Lansing with ATSC.

However, I will stand by what I said, in that I find it almost impossible to have a null on the pilot that is -114 db, yet have that signal recoverable a few feet away.

What you described is a pilot that was maybe -80, dB and recoverable a couple of hundred yards away. Any WSD with sensitivity for pilot down to -114 dB would have still detected a carrier, even if you couldn't see it on an HP Spectrum Analyzer.

Ther is another tool available to help protect the used frequencies in any market. We can a database of known broadcasters into these devices. It could work with something as simple as entering a zip code in the device before you can use it. The device would look in the database for that zip code and block the use of known occupied channels. This could be especially effective for geographic locations that are know to suffer from multipath and terrain blockage.


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