[opendtv] Re: News: Shure Wants White Space Tests at Pats-Ravens Game
- From: "Hunold, Ken" <KRH@xxxxxxxxx>
- To: <opendtv@xxxxxxxxxxxxx>
- Date: Mon, 19 Nov 2007 13:25:19 -0500
The Society of Broadcast Engineers does frequency coordination for a
variety of users. This is from their web site www.sbe.org.
"SBE maintains a vital frequency coordination program. Volunteers from
across the country maintain local BAS databases and provide coordination
to Part 74 frequency users. SBE also offers frequency coordination for
events, including games of the National Football League (NFL).
SBE provides an online frequency coordination request system for use by
broadcasters and others who need to coordinate BAS frequency use.
SBE also works with the FCC, Sprint Nextel, NAB and MSTV to facilitate
the Broadcast Auxiliary Spectrum (BAS) transition."
-----Original Message-----
From: opendtv-bounce@xxxxxxxxxxxxx [mailto:opendtv-bounce@xxxxxxxxxxxxx]
On Behalf Of Craig Birkmaier
Sent: Monday, November 19, 2007 9:22 AM
To: opendtv@xxxxxxxxxxxxx
Subject: [opendtv] Re: News: Shure Wants White Space Tests at
Pats-Ravens Game
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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