[opendtv] Re: Google's Page: White spaces test was unfair

  • From: "John Willkie" <johnwillkie@xxxxxxxxxxxxx>
  • To: <opendtv@xxxxxxxxxxxxx>
  • Date: Fri, 26 Sep 2008 18:39:23 -0700

So, you're able to "answer" vaguely worded questions.  Google is confused,
Sergei is confused, and you are confused somewhat as well.

Here's a good rule of thumb.  The "interference area" caused by an emitter
like a TV transmitter is about three times the size of the "service area."  

This is something else, no doubt, that was unfair to Google, which wants to
negotiate laws of physics.

They may want 1 watt; they are unlikely ever to get even as much as 100 mw.

John Willkie

-----Mensaje original-----
De: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx] En
nombre de Manfredi, Albert E
Enviado el: Friday, September 26, 2008 3:17 PM
Para: opendtv@xxxxxxxxxxxxx
Asunto: [opendtv] Re: Google's Page: White spaces test was unfair

Tom Barry wrote:

> Are wireless microphones allowed to operate on the same frequencies
> as local TV channels?

Wouldn't work too well, because the broacast signal would soon overpower
the mike's signal.

The article was very confused. I don't know if Google was confused, or
whether the author was confused. After re-reading it, I think both were.

The risk to wireless mikes is that when they operate over a white space,
the drunken fans in the stadium will be lighting up their little new
toys. These new toys would be designed to detect broadcast channels in
use by broadcasters, but might not so easily auto-detect the much weaker
signal from the mikes in the stadium, trying to operate over that unused
frequency slice. So they could (and do, I gather) end up interfering
with the mikes.

This is similar to the problem these devices create in apartment
buildings, for example. Where the white space device might be turned on
in a small dead zone for a given TV signal, and we all know these do
exist indoors, and end up obliterating the already weakened broadcaster
signal in nearby apartments.

I did the numbers. At 1 watt output supposedly to be allowed, this is a
definite possibility.

Bert
 
 
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