[opendtv] Re: News: Shure Wants White Space Tests at Pats-Ravens Game
- From: Albert Manfredi <albert.e.manfredi@xxxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 19 Nov 2007 20:43:12 -0500
Craig Birkmaier wrote:
> The test is to determine if the WSDs are able to detect the
> use of the channel(s) that are being used for the wireless
> mics. I believe they will test the ability of the WSDs to
> detect the mic signals, but will not use the transmit
> capabilities of the tested devices.
Richard Hollandsworth wrote:
> In order to detect a mic being activated on a presumed
> "unused" freq after the initial scan, WSD devices will
> need to continually rescan on what is now a WSD
> operational freq, looking for a late mic (et. al.) arrival.
>
> The WSD tests should be conducted in an "operational"
> environment, whereby the devices are kept busy
> receiving data (at max throughput rate) in order to truly
> evaluate "scan while operate"....if it's even implemented
> in the prototypes....
The risk of WSDs is their potential proximity to a receiver trying to receive a
TV station. The fact that a 1 watt transmitter very close to a receiver can
overwhelm the signal strength of a much stronger distant station. And
apparently, even cable receivers connected via coax to the cable system.
If these mikes are equally low-powered, and typically used in large venues,
possibly the likelihood of WSDs interfering with mikes becomes very low. Except
that we really don't know yet what these WSDs will be. For example, maybe
someone will come up with some cool ad-hoc WSD mesh nets for fans at a ball
park to use to chat with each other or exchange photos taken at the game. That
could interfere with mikes. But WSDs in homes? Probably not an issue.
> Of course, we can already see the glowing press releases
> being written now, claiming that everything is working
> perfectly---despite the very limited and artificial construct
> of the proposed NFL test---just as they are trying to
> paper over the miserable results from the earlier OET
> tests....
I'd like to see a redo of the FCC test. What I can't figure out is how the
results can possibly change, given tha the real problem discovered in that test
was the cable receivers, and of course there's no white spaces there. I'm quite
certain that if the only problem had been OTA TV reception, in the US anyway,
the level of concern would be a lot lower. It would be just another excuse for
retailers (and broadcasters) to try to convince everyone to subscribe to an
umbillical system.
Bert
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