Sec.  21.2   Definitions.

   

   As used in this part:

   Antenna power gain. The square of the ratio of the root-mean-square
   free space field intensity produced at one mile in the horizontal
   plane, in millivolts per meter for one kilowatt antenna input power to
   137.6 mV/m. This ratio should be expressed in decibels (dB). (If
   specified for a particular direction, antenna power gain is based on
   the field strength in that direction only.)

   Antenna power input. The radio frequency peak or RMS power, as the
   case may be, supplied to the antenna from the antenna transmission
   line and its associated impedance matching network.

   Antenna structures. The antenna, its supporting structure and anything
   attached to it.

   Assigned frequency. The centre of the frequency band assigned to a
   station.

   Authorized bandwidth. The maximum width of the band of frequencies
   permitted to be used by a station. This is normally considered to be
   the necessary or occupied bandwidth, whichever is greater.

   Authorized frequency. The frequency, or frequency range, assigned to a
   station by the Commission and specified in the instrument of
   authorization.

   Authorized power. The maximum power a station is permitted to use.
   This power is specified by the Commission in the station's
   authorization.

   Bandwidth occupied by an emission. The band of frequencies comprising
   99 percent of the total radiated power extended to include any
   discrete frequency on which the power is at least 0.25 percent of the
   total radiated power.

   Basic Trading Area (BTA). The geographic areas by which the Multipoint
   Distribution Service is licensed. BTA boundaries are based on the Rand
   McNally 1992 Commercial Atlas and Marketing Guide, 123rd Edition, pp.
   36-39, and include six additional BTA-like areas as specified in
   Sec. 21.924(b).

   Bit rate. The rate of transmission of information in binary (two
   state) form in bits per unit time.

   Booster service area. A geographic area to be designated by an
   applicant for a booster station, within which the booster station
   shall be entitled to protection against interference as set forth in
   this part. The booster service area must be specified by the applicant
   so as to not overlap the booster service area of any other booster
   authorized to or proposed by the applicant. However, a booster station
   may provide service to receive sites outside of its booster service
   area, at the licensee's risk of interference.

   BTA authorization holder. The individual or entity authorized by the
   Commission to provide Multipoint Distribution Service to the
   population of a BTA.

   BTA service area. The area within the boundaries of a BTA to which a
   BTA authorization holder may provide Multipoint Distribution Service.
   This area excludes the protected service areas of incumbent MDS
   stations and previously proposed and authorized ITFS facilities,
   including registered receive sites.

   Carrier. In a frequency stabilized system, the sinusoidal component of
   a modulated wave whose frequency is independent of the modulating
   wave; or the output of a transmitter when the modulating wave is made
   zero; or a wave generated at a point in the transmitting system and
   subsequently modulated by the signal; or a wave generated locally at
   the receiving terminal which when combined with the side bands in a
   suitable detector, produces the modulating wave.

   Carrier frequency. The output of a transmitter when the modulating
   wave is made zero.

   Channel. Unless otherwise specified, a channel under this part shall
   refer to a 6 MHz frequency block assigned pursuant to Sec. Sec. 21.901(b) or
   74.902(a) of this chapter.

   Communication common carrier. Any person engaged in rendering
   communication service for hire to the public.

   Control point. A control point is an operating position at which an
   operator responsible for the operation of the transmitter is stationed
   and which is under the control and supervision of the licensee.

   Control station. A fixed station whose transmissions are used to
   control automatically the emissions or operations of another radio
   station at a specified location, or to transmit automatically to an
   alarm center telemetering information relative to the operation of
   such station.

   Coordination distance. For the purpose of this part, the expression
   "coordination distance" means the distance from an earth station,
   within which there is a possibility of the use of a given transmitting
   frequency at this earth station causing harmful interference to
   stations in the fixed or mobile service, sharing the same band, or of
   the use of a given frequency for reception at this earth station
   receiving harmful interference from such stations in the fixed or
   mobile service.

   Digital modulation. The process by which some characteristic
   (frequency, phase, amplitude or combinations thereof) of a carrier
   frequency is varied in accordance with a digital signal, e.g. one
   consisting of coded pulses or states.

   Documented complaint. A complaint that a party is suffering from
   non-consensual interference. A documented complaint must contain a
   certification that the complainant has contacted the operator of the
   allegedly offending facility and tried to resolve the situation prior
   to filing. The complaint must then specify the nature of the
   interference, whether the interference is constant or intermittent,
   when the interference began and the site(s) most likely to be causing
   the interference. The complaint should be accompanied by a videotape
   or other evidence showing the effects of the interference. The
   complaint must contain a motion for a temporary order to have the
   interfering station cease transmitting. The complaint must be filed
   with the Secretary's office and served on the allegedly offending
   party.

   Domestic fixed public service. A fixed service, the stations of which
   are open to public correspondence, for radiocommunications originating
   and terminating solely at points all of which lie within:

   (a) The State of Alaska;

   (b) The State of Hawaii;

   (c) The contiguous 48 States and the District of Columbia; or

   (d) A single possession of the United States. Generally, in cases
   where service is afforded on frequencies above 72 MHz,
   radio-communications between the contiguous 48 States (including the
   District of Columbia) and Canada or Mexico, or radiocommunications
   between the State of Alaska and Canada, are deemed to be in the
   domestic fixed public service.

   Domestic public radio services. The land mobile and domestic fixed
   public services the stations which are open to public correspondence.

     NOTE: Note:

     Part 80 of this chapter is applicable to the maritime services and
     fixed stations associated with the maritime services; part 87 of
     this chapter is applicable to aeronautical services.

   Earth station. A station located either on the earth's surface or
   within the major portion of the earth's atmosphere and intended for
   communications:

   (a) With one or more space stations; or

   (b) With one or more stations of the same kind by means of one or more
   reflecting satellites or other objects in space.

   Effective radiated power (ERP). The product of the power supplied to
   the antenna and its gain relative to a half-wave dipole in a given
   direction.

   Equivalent Isotropically Radiated Power (EIRP). The product of the
   power supplied to the antenna and the antenna gain in a given
   direction relative to an isotropic antenna. This product may be
   expressed in watts or dB above 1 watt (dBW).

   Facsimile. A form of telegraphy for the transmission of fixed images,
   with or without half-tones, with a view to their reproduction in a
   permanent form.

   Fixed earth station. An earth station intended to be used at a
   specified fixed point.

   Fixed station. A station in the fixed service.

   Frequency tolerance. The maximum permissible departure by the centre
   frequency of the frequency band occupied by an emission from the
   assigned frequency or, by the characteristic frequency of an emission
   from the reference frequency. The frequency tolerance is expressed as
   a percentage or in Hertz.

   Harmful interference. Interference which endangers the functioning of
   a radionavigation service or of other safety services or seriously
   degrades, obstructs, or repeatedly interrupts a radiocommunication
   service.

   Incumbent. An MDS station that was authorized or proposed before
   September 15, 1995, including those stations that are subsequently
   modified, renewed or reinstated.

   Landing area. A landing area means any locality, either of land or
   water, including airports and intermediate landing fields, which is
   used, or approved for use for the landing and take-off of aircraft,
   whether or not facilities are provided for the shelter, servicing, or
   repair of aircraft, or for receiving or discharging passengers or
   cargo.

   Microwave frequencies. As used in this part, this term refers to
   frequencies of 890 MHz and above.

   Multichannel Multipoint Distribution Service (MMDS). Those Multipoint
   Distribution Service Channels that use the frequency band 2596 MHz to
   2644 MHz and associated 125 kHz channels.

   Multipoint Distribution Service (MDS). A domestic public radio service
   rendered on microwave frequencies from one or more fixed stations
   transmitting to multiple receiving facilities located at fixed points.
   MDS also may encompass transmissions from response stations to
   response station hubs or associated fixed stations.

   Multipoint Distribution Service response station. A fixed station
   operated by an MDS licensee, the lessee of MDS channel capacity or a
   subscriber of either to communicate with a response station hub or
   associated MDS station. A response station under this part may share
   facilities with other MDS response stations and/or one or more
   Instructional Television Fixed Service (ITFS) response stations
   authorized pursuant to Sec. 74.939 of this chapter or Sec. 74.940 of this
   chapter.

   Necessary bandwidth of emission. For a given class of emission, the
   width of the frequency band that is just sufficient to ensure the
   transmission of information at the rate and with the quality required
   under specified conditions.

     NOTE: Note:

     The necessary bandwidth for an emission may be calculated using the
     formulas in Sec. 2.202 of this chapter.

   Partitioned service area authorization holder. The individual or
   entity authorized by the Commission to provide Multipoint Distribution
   Service to the population of a partitioned service area.

   Partitioned service area (PSA). The area within the coterminous
   boundaries of one of more counties or other geopolitical subdivisions,
   drawn from a BTA, to which an authorization holder may provide
   Multipoint Distribution Service or the area remaining in a BTA upon
   partitioning any portion of that BTA. This area excludes the protected
   service areas of incumbent MDS stations and previously proposed and
   authorized ITFS stations, including registered receive sites.

   Private line service. A service whereby facilities for communication
   between two or more designated points are set aside for the exclusive
   use or availability for use of a particular customer and authorized
   users during stated periods of time.

   Public correspondence. Any telecommunication which the offices and
   stations, by reason of their being at the disposal of the public, must
   accept for transmission.

   Radio station. A separate transmitter or a group of transmitters under
   simultaneous common control, including the accessory equipment
   required for carrying on a radiocommunication service.

   Radiocommunication. Telecommunication by means of radio waves.

   Rated power output. The term "rated power output" of a transmitter
   means the normal radio frequency power output capability (Peak or
   Average Power) of a transmitter, under optimum conditions of
   adjustment and operation, specified by its manufacturer.

   Record communication. Any transmission of intelligence which is
   reduced to visual record form at the point of reception.

   Reference frequency. A frequency having a fixed and specified position
   with respect to the assigned frequency. The displacement of this
   frequency with respect to the assigned frequency has the same absolute
   value and sign that the displacement of the characteristic frequency
   has with respect to the center of the frequency band occupied by the
   emission.

   Relay station. A fixed station used for the reception and
   retransmission of the signals of another station or stations.

   Repeater station. A fixed station established for the automatic
   retransmission of radiocommunications received from one or more
   stations and directed to a specified receiver site.

   Response station hub. A fixed facility licensed to an MDS licensee,
   and operated by an MDS licensee or the lessee of an MDS facility, for
   the reception of information transmitted by one or more MDS response
   stations that utilize digital modulation. A response station hub
   licensed under this part may share facilities with other MDS response
   station hubs, ITFS response station hubs authorized pursuant to
   Sec. 74.939 of this chapter, MDS signal booster stations, ITFS signal
   booster stations, MDS stations, and/or ITFS stations.

   Response station hub license. A blanket license authorizing the
   operation of a single response station hub at a specific location and
   the operation of a specified number of associated digital response
   stations of one or more classes at unspecified locations within one or
   more regions of the response service area.

   Sectorization. The use of an antenna system at an MDS station, booster
   station and/or response station hub that is capable of simultaneously
   transmitting multiple signals over the same frequencies to different
   portions of the service area and/or simultaneously receiving multiple
   signals over the same frequencies from different portions of the
   service area.

   Signal Booster Station. An MDS station licensed for use in accordance
   with Sec. 21.913 that operates on one or more MDS channels. Signal booster
   stations are intended to augment service as part of a distributed
   transmission system where signal booster stations retransmit the
   signals of one or more MDS stations and/or originate transmissions on
   MDS channels. A signal booster station licensed under this part may
   share facilities with other MDS signal booster stations, ITFS signal
   booster stations authorized pursuant to Sec. 74.985 of this chapter, MDS
   response station hubs and/or ITFS response station hubs.

   Standby transmitter. A transmitter installed and maintained for use in
   lieu of the main transmitter only during periods when the main
   transmitter is out of service for maintenance or repair.

   Symbol rate. Modulation rate in bauds. This rate may be higher than
   the transmitted bit rate as in the case of coded pulses or lower as in
   the case of multilevel transmission.

   Television. A form of telecommunication for transmission of transient
   images of fixed or moving objects.

   Television STL station (studio transmitter link). A fixed station used
   for the transmission of television program material and related
   communications from a studio to the transmitter of a television
   broadcast station.

   [ 61 FR 26671 , May 28, 1996, as amended at  63 FR 65100 , Nov. 25, 1998;
    64 FR 63730 , Nov. 22, 1999]

Subpart B--Applications and Licenses

   

General Filing Requirements