[opendtv] Re: News: FCC: White Spaces Test "Well Done and Thorough"
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Thu, 30 Oct 2008 18:40:53 -0400
Richard Hollandsworth wrote:
> Here is link to Peer Review, incl. Tasking & Summary Memos:
> http://www.fcc.gov/oet/
> Note that the Tasking Memo did NOT ask whether the CONCLUSIONS
> in the report were well supported and appropriate. THAT is the
> biggest defect in the FCC/OET WSD PhII Interference Report..
Yes, but as a matter of fact, there is no "conclusions" section per se.
There's the executive summary up front, but nothing in it hints that
WSDs should be allowed. What the report reported is not consistent with
allowing WSDs. That decision came out of the blue.
The report clearly showed that in auto-sense only, the devices were not
fool proof. They went both ways, showing occupied channels as free and
also sometimes showing free channels as occupied. (And it's very easy to
show how auto sense can be fooled, especially when devices are used
indoors or where the DTT signal is badly distorted. Example: a notch
where the pilot is.)
The report showed that with geo-location, local channels were always
shown to be occupied correctly. HOWEVER, with geo-location, some
channels that were viewable but not local were labeled as free. So that
would allow a WSD to radiate there, which is counter to the FCC's stated
intent to continue to allow OTA viewers to view the out of market
stations they were capable of seeing before analog sutoff.
Furthermore, their (new with this report) restrictions to 100 mW, 50 mW
sense-only, and 40 mW adjacent channel to a DTT channel, do not work
when their recent report on receiver performance is taken into account.
This is easily shown. Has to do with the undesired signal level at the
receive antenna of a TV receiver. Undesired signal strength is very
high.
So it is with these points in mind that the FCC tentative approval makes
no sense.
Bert
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