Wireless Microphone Issues

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					      Presented By Tom Smith
  WHA-TV Engineering Department
SBE Chapter 24 Frequency Coordinator
DTV Post Transition:
      Clearing 700 MHz Band
TV White Space Devices
Legal and Illegal Users
Refarming of TV Band For Wireless
Channel Changes By TV Broadcasters
   Clearing of 700 MHz Band
 This should have been completed as
stations have been operating on DTV
    Channels since 2002 or earlier
 Some Stations Changed Their DTV
Channels Between February 17th and
              June 12th.
If you are experiencing interference
 issues, you may be on one of those
    FCC Has Auctioned Off Most of
    Channels 51-69 for Wireless Use
     Channels 62, 64, 68 and 69 are
        Reserved for Public Safety
All TV stations and Broadcast Auxiliary
      users have to vacate the Band
FCC Ordered all Manufacturers to cease
manufacturing, importing and selling
of units on channels 51-69 in Fall of
FCC has not issued a rulemaking
requiring users to cease operation on
channels 51-69
Wireless Auction Winners want
wireless Microphones off these
channels by February 17, 2010 or at the
start of their operations in a market.
Wireless microphone users groups
would like up to 2 years to clear band,
maybe as late February 17, 2012
As we don’t know when the FCC will
rule or how long they will give, it is best
to budget and start the purchase
process as soon as possible if you are on
the affected channels.
On November 4, 2008, the FCC issued a
rulemaking allowing unlicensed
broadband systems to share the TV
broadcast Band.
These TV Broadband Devices can be
WiMax data transmitters or other
computer data or media devices.
The National Association of
Broadcasters, the Association for
Maximum Service Television, ESPN, all
of the pro sports leagues and the
Broadway theater operators have filed
lawsuits asking that the rulemaking be
Two types of systems will be allowed.
One will be a high power transmission
system that will cover several square
The second system will be a low power
system that will provide coverage over
short distances such as in a home or
Wide area transmission systems can
operate with 4 watts at up to 30 meters in
height on 2nd adjacent or greater from an
occupied TV stations channel
 Personal return units and private networks
can operate with 100 milliwatts on the same
channels and 40 milliwatts on channels
adjacent to TV stations
TV White Space Devices must have access
to data base in order to find an open
channel to operate on.
They will be required to check that
database when beginning to operate and at
regular intervals when in operation.
When the technology is operational, listen
before transmit will be allowed
Besides TV stations and licensed
broadcast auxiliary users, the big issue
now is what other wireless microphone
users can be placed on the database.
One of the Issues in the TV White
Space Rulemaking was unlicensed
White Space Proponents considered
unlicensed users as squatters that
would prohibit their use of the TV
bands and asked that they receive no
interference protection.
According to the FCC rules, the only
persons that can use wireless
microphones in the TV or other aural
broadcast auxiliary bands are those that
are eligible for a license
Out of all of the broadcasters, TV and
motion picture producers, networks
and cable programmers, there are less
than a thousand licensed wireless
microphone users.
Sec. 74.801 Definitions.
Cable television system operator. A cable television operator is defined in
Sec. 76.5(cc) of the rules.
Low power auxiliary station. An auxiliary station authorized and operated
pursuant to the provisions set forth in this subpart. Devices authorized as
low power auxiliary stations are intended to transmit over distances of
approximately 100 meters for uses such as wireless microphones, cue and
control communications, and synchronization of TV camera signals.
Motion picture producer. Motion picture producer refers to a person or
organization engaged in the production or filming of motion pictures.
 Television program producer. Television program producer refers to a
person or organization engaged in the production of television programs.
Wireless assist video device. An auxiliary station authorized and operated
by motion picture and television program producers pursuant to the
provisions of this subpart. These stations are intended to transmit over
distances of approximately 300 meters for use as an aid in composing
camera shots on motion picture and television sets. .
Sec. 74.832 Licensing requirements and procedures.
(a) A license authorizing operation of one or more low power auxiliary stations will be
issued only to the following:
(1) A licensee of an AM, FM, TV, or International broadcast station or low power TV
station. Low power auxiliary stations will be licensed for used with a [[Page 503]]
specific broadcast or low power TV station or combination of stations licensed to the
same licensee within the same community.
(2) A broadcast network entity.
(3) A cable television system operator who operates a cable system that produces
program material for origination or access cablecasting, as defined in Sec. 76.5(r). (4)
Motion picture producers as defined in Sec. 74.801.
(5) Television program producers as defined in Sec. 74.801.
(6) Licensees and conditional licensees of stations in the Service and Multichannel
Multipoint Distribution Service as defined in Sec. 21.2 of this chapter, or entities that
hold an executed lease agreement with an MDS or MMDS licensee or conditional
licensee or with an Instructional Television Fixed Service licensee or permittee
Sec. 74.802 Frequency assignment.
Frequencies within the following bands may be assigned for use by low power
auxiliary stations: [[Page 502]]
 26.100-26.480 MHz
54.000-72.000 MHz 76.000-88.000 MHz
161.625-161.775 MHz (except in Puerto Rico or the Virgin Islands)
174.000-216.000 MHz
450.000-451.000 MHz
455.000-456.000 MHz
470.000-488.000 MHz
488.000-494.000 MHz (except Hawaii)
494.000-608.000 MHz
614.000-806.000 MHz
944.000-952.000 MHz
(b) The following frequencies are available for wireless microphone
operations to eligible's in this part, subject to the provisions of this
Frequencies (MHz) 169.445, 171.045, 169.505 , 171.105, 170.245, 171.845
170.305, 171.905
(1) The emission bandwidth shall not exceed 54 kHz.
(2) The output power shall not exceed 50 milliwatts.
 (3) The frequency stability of wireless microphones shall limit the total
emission to within <PLUS-MINUS32.5 kHz of the assigned frequency.
(4) Wireless microphone operations are unprotected from interference
from other licensed operations in the band. If any interference from
wireless microphone operation is received by any Government or non-
Government operation, the wireless microphone must cease operation
on the frequency involved. Applications are subject to Government
A number of comments in the TV
white space rulemaking asked that
the FCC deal with the ineligible
users of wireless mikes. They
included the wireless microphone
manufacturers, users, public
interest groups and some from the
computer industry.
A number of comments from the
proponents of the use of TV white
spaces asked that that FCC prohibit
the use of the TV band by those
ineligible for a licenses as this would
restrict their access to the band.
On August 25th, the Association for
Maximum Service Television
(MSTV) proposed that the FCC allow
theaters, live music producers,
government bodies and houses of
worship to obtain license to operate
wireless microphones under part 74
of the FCC rules.
As part of it’s inquiry into the future
of broadband, the FCC issued a
notice of inquiry asking for input on
the future use of radio spectrum for
wireless including asking what
spectrum would be needed and
where it would come from.
On October 23rd, the Consumer
Electronics Association released a
paper suggesting that TV spectrum
was too valuable to used for TV
broadcasting. Many comments
appeared in print that supported
the proposal.
The NAB and the MSTV meet with
Blair Levin, the FCC’s broadband
advisor who suggested possibly
reducing all TV broadcasts to one
SD multicast channel.
Congress is requiring the FCC to
release the results of their
broadband inquiry by February 17,
2010. Their plans for the future uses
of the TV band will become known
at that time.
Maintains databases of broadcast
auxiliary frequencies to aid local
stations and visitors to plan usage.
Facilitates dialog between users.
Flags possible conflicts .
Does not assign frequencies, only
helps users select their own.
    Tom Smith