So, these devices will also have a live online connection and a gps device, and they will know how close they are to a sporting venue, and what (unlicensed, but authorized) uses are made of which frequencies at the venue, and they'l know how close they are to which hospitals, and they'll know what (unlicensed, but authorized) use these hospitals make in their ICUs and elsewhere of broadcast frequencies for patient monitoring-equipment?

What if the wsd is in a laptop, and junior comes to visit grandma, who is on life support on her death bed?  Then, junior turns on his laptop to show grandma the latest photos, and kills grandma, because his wsd turns on and was using, at least for a second, the parameters that worked at home.

You may have the home situation thought out; your scenario wouldn't work outside of the home, or fixed devices.  Now, let's talk about people with WSDs and evil intent, not ignorance ...

John Willkie

-----Original Message-----
From: Richard Hollandsworth
Sent: Oct 3, 2007 3:32 PM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: News: Microsoft, Philips Offer New White Space Test Results

I think the scenaria need to be clarified.....

Towards the "fringes" (and maybe only half-way to Class B limit), DTV viewers are
forced to use attic or roof-mounted antenna systems with moderate gain in order to
receive a usable signal.

On the other hand, WSD devices may be located in the bottom floor of a condo/apt
building, or even in the basement and hence would need to be more sensitive.

Basic problem is whether an improvement of 20 dB in sensitivity is enough or not.
Given the height gain difference, indoor loss and negative gain antenna factors, there are
going to be many WSD devices that do not detect what the OTA DTV is trying to watch.

But avoiding active DTV channels is a readily solvable problem via on-line
database lookup (or whatever)....so presumably only the WSD and remote
mike systems need to avoid each other....

But, of course, there are NO White Spaces on Cable (and some SAT systems).

holl_ands

=================================
John Shutt <shuttj@xxxxxxxxx> wrote:

Al,

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.

John

----- Original Message -----
From: "Allen Le Roy Limberg"
To:


> One could drive a hundred yards or so from good reception to abysmal
> reception. The transmission antenna heights are pretty low for some DC
> area
> stations, and the terrain is pretty much hill and dale.

---

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