[opendtv] Re: News: Shure Wants White Space Tests at Pats-Ravens Game
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 19 Nov 2007 09:21:30 -0500
At 9:12 AM -0500 11/18/07, Tom Barry wrote:
Do the wireless mics have some sort of legal precedence here? That
is, do they somehow reserve the right to the spectrum they use in
the name of the broadcasters?
Or in the future will those mics also be required to auto-sense
other uses of a frequency, and act as good citizens?
Not exactly. Technically, wireless mics require a license that one
can obtain from the FCC, but many do not bother since the FCC does
not enforce these license. Interference is controlled in several ways:
Local frequency coordinators - you register with the local authority
and they tell you what frequencies you can use.
Monitoring - you use a spectrum analyzer to look for signals that you
might interfere with.
Laize Faire - you just do it and don't worry because the signal
levels are so low that they probably won;t interfere with anything.
Typically you just turn on the mic and find a frequency that is NOT
noisy.
The larger question here is whether White Space Devices must be
capable of detecting the high powered signals of broadcasters, or
must also detect low power uses by other white space devices such as
wireless mics and medical telemetry devices?
I believe that this gets much more difficult. My guess is that the
correct solution is to set aside some frequencies in each market for
wireless mics that cannot be shared by WSDs. If all WSDs must go
through some local frequency coordination this should not be a
problem. Looks like the broadcasters want all devices to be
coordinated.
Regards
Craig
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