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

  • From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 8 Oct 2007 17:11:04 -0700

Is there an n+7 / -6 issue with 8-VSB?  I thought dtv receivers didn't
commonly employ 45 mhz if sections.  I can see n+/- 1 and n+/- 2 (splatter).

Of course, this would be less of a problem if all stations are forced to use
SFNs, and all txs for a market are present at each tx site.  Then, linearity
would help minimize interference.

And, we might as well think in that direction, because full co-location is
about as probable in the U.S. as is mandated use of SFNs.

John Willkie

-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Allen Le Roy Limberg
Enviado el: Monday, October 08, 2007 5:00 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: News: Microsoft, Philips Offer New White Space Test
Results

A narrowband auto-free-channel-detect mechanism presents the problem that it
does not evaluate the harmonic, intermodulation and cross-modulation
problems that the low-power transmitter can cause for nearby TV receivers
tuned to channels other than the one it transmits in.  Bert alludes to these
problems, but perhaps in a vague enough way that some may not catch the
drift of his remarks.

Al


 
 
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