Sec.  74.901  Definitions.

    Attended operation. Operation of a station by a designated person on 
duty at the place where the transmitting apparatus is located with the 
transmitter in the person's plain view.
    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. The booster station must be capable of 
providing substantial

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service within the designated booster service area.
    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) of this chapter or 74.902(a).
    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.
    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 radiator. This product may be expressed 
in watts or dB above 1 watt (dBW).
    Instructional television fixed station. A fixed station licensed to 
an educational organization and intended primarily for video, data, or 
voice transmissions of instructional, cultural, and other types of 
educational material to one or more fixed receiving locations.
    ITFS response station. A fixed station operated by an ITFS licensee, 
the lessee of ITFS channel capacity or a subscriber of either to 
communicate with a response station hub or associated ITFS station. A 
response station under this part may share facilities with other ITFS 
response stations and/or one or more Multipoint Distribution Service 
(MDS) response stations authorized pursuant to Sec.  21.909 of this 
chapter or Sec.  21.949 of this chapter.
    Main channel: The main channel is that portion of each authorized 
channel used for the transmission of visual and aural information as set 
forth in Sec.  73.682 of this Chapter and Sec.  74.938 of this subpart.
    Point-to-point ITFS station. An ITFS station that transmits a highly 
directional signal from a fixed transmitter location to a fixed receive 
location.
    Remote control. Operation of a station by a designated person at a 
control position from which the transmitter is not visible but where 
suitable control and telemetering circuits are provided which allow the 
performance of the essential functions that could be performed at the 
transmitter.
    Response station hub. A fixed facility licensed to an ITFS licensee, 
and operated by an ITFS licensee or the lessee of an ITFS channel, for 
the reception of information transmitted by one or more ITFS response 
stations that utilize digital modulation with uniform power spectral 
density. A response station hub licensed under this part may share 
facilities with other ITFS response station hubs, MDS response station 
hubs authorized pursuant to Sec.  21.909 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 ITFS 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 ITFS station licensed for use in 
accordance with Sec.  74.985 that operates on one or more ITFS channels. 
Signal booster stations are intended to augment service as part of a 
distributed transmission system where signal booster stations retransmit 
the signal of an ITFS station and/or originate information. A signal 
booster station licensed under this part

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may share facilities with other ITFS signal booster stations, MDS signal 
booster stations authorized pursuant to Sec.  21.913 of this chapter, 
MDS response stations and/or ITFS response stations.
    Studio to transmitter link (STL). A directional path used to 
transmit a signal from a station's studio to its transmitter.
    Subsidiary channel: A subsidiary channel is any portion of an 
authorized channel not used for main channel transmissions.
    Temporary fixed ITFS station. An ITFS station used for the 
transmission of material from temporary unspecified points to an ITFS 
station.
    Unattended operation. Operation of a station by automatic means 
whereby the transmitter is turned on and off and performs its functions 
without attention by a designated person.

[ 28 FR 13731 , Dec. 14, 1963, as amended at  35 FR 4705 , Mar. 18, 1970;  48 FR 33901 , July 26, 1983;  49 FR 32596 , Aug. 15, 1984;  55 FR 46013 , Oct. 
31, 1990;  60 FR 55483 , Nov. 1, 1995;  63 FR 65113 , Nov. 25, 1998;  64 FR 63737 , Nov. 22, 1999]