[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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