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

  • From: "Allen Le Roy Limberg" <allimberg@xxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Mon, 8 Oct 2007 19:59:56 -0400

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
----- Original Message ----- 
From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
To: <opendtv@xxxxxxxxxxxxx>
Sent: Thursday, October 04, 2007 10:54 AM
Subject: [opendtv] Re: News: Microsoft, Philips Offer New White Space Test
Results


>
> My own short answer is that if an auto-free-channel-detect mechanism is
> *not* used, but some other more fool-proof method is used, then there is
> a higher chance of the WSD not causing any problems with respect to OTA
> TV.
>
> The problems to cable TV is another matter, because there are no white
> spaces there. So that could be enough to keep thses devices off the
> market, depending what the FCC finds this time around.
>
> The other issue is the N+/-1, N+/-2, N+7, N-6, whatever other weird
> vulnerabilities they find. In a managed system, beacon signal or service
> provider managed, that could limit white spaces quite a bit.
>
> Bert
>
>
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