§ 74.1201   Definitions.

   (a) FM translator. A station in the broadcasting service operated for the
   purpose of retransmitting the signals of an AM or FM radio broadcast station
   or another FM broadcast translator station without significantly altering
   any characteristics of the incoming signal other than its frequency and
   amplitude,  in order to provide radio broadcast service to the general
   public.

   (b) Commercial FM translator. An FM broadcast translator station which
   rebroadcasts the signals of a commercial AM or FM radio broadcast station.

   (c) Noncommercial FM translator. An FM broadcast translator station which
   rebroadcasts the signals of a noncommercial educational AM or FM radio
   broadcast station.

   (d) Primary station. The AM or FM radio broadcast station radiating the
   signals which are retransmitted by an FM broadcast translator station or an
   FM broadcast booster station.

   (e) AM or FM radio broadcast station. When used in this Subpart L, the term
   AM broadcast station or AM radio broadcast station or FM broadcast station
   or  FM  radio broadcast station refers to commercial and noncommercial
   educational AM or FM radio broadcast stations as defined in § 2.1 of this
   chapter, unless the context indicates otherwise.

   (f) FM broadcast booster station. A station in the broadcasting service
   operated for the sole purpose of retransmitting the signals of an FM radio
   broadcast station, by amplifying and reradiating such signals, without
   significantly altering any characteristic of the incoming signal other than
   its amplitude.

   (g) Translator coverage contour. For a fill-in FM translator rebroadcasting
   an FM radio broadcast station as its primary station, the FM translator's
   coverage contour must be contained within the primary station's coverage
   contour. For purposes of this rule section, the coverage contour of the FM
   translator has the same field strength value as the protected contour of the
   primary FM station (i.e., for a commercial Class B FM station it is the
   predicted 0.5 mV/m field strength contour, for a commercial Class B1 FM
   station it is the predicted 0.7 mV/m field strength contour, and for all
   other classes of FM stations it is the predicted 1 mV/m field strength
   contour). The coverage contour of an FM translator rebroadcasting an AM
   radio broadcast station as its primary station must be contained within the
   lesser of the 2 mV/m daytime contour of the AM station and a 25-mile (40 km)
   radius centered at the AM transmitter site. The protected contour for an FM
   translator station is its predicted 1 mV/m contour.

   (h) Fill-in area. The area where the coverage contour of an FM translator or
   booster station is within the protected contour of the associated primary
   station (i.e., predicted 0.5 mV/m contour for commercial Class B stations,
   predicted 0.7 mV/m contour for commercial Class B1 stations, and predicted 1
   mV/m contour for all other classes of stations).

   (i) Other area. The area where the coverage contour of an FM translator
   station extends beyond the protected contour of the primary station (i.e.,
   predicted 0.5 mV/m contour for commercial Class B stations, predicted 0.7
   mV/m contour for commercial Class B1 stations, and predicted 1 mV/m contour
   for all other classes of stations).

   (j)  AM Fill-in area. The area within the lesser of the 2 mV/m daytime
   contour of the AM radio broadcast station being rebroadcast and a 25-mile
   (40 km) radius centered at the AM transmitter site.

   [ 35 FR 15388 , Oct. 2, 1970, as amended at  45 FR 37842 , June 5, 1980;  52 FR 31405 , Aug. 20, 1987;  55 FR 50693 , Dec. 10, 1990;  74 FR 45129 , Sept. 1,
   2009]

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