Sec. 74.1201  Definitions.

    (a) FM translator. A station in the broadcasting service operated 
for the purpose of retransmitting the signals of an 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 FM broadcast service to the 
general public.
    (b) Commercial FM translator. An FM broadcast translator station 
which rebroadcasts the signals of a commercial FM radio broadcast 
station.
    (c) Noncommercial FM translator. An FM broadcast translator station 
which rebroadcasts the signals of a noncommercial educational FM radio 
broadcast station.
    (d) Primary station. The FM radio broadcast station radiating the 
signals which are retransmitted by an FM broadcast translator station or 
an FM broadcast booster station.
    (e) FM radio broadcast station. When used in this Subpart L, the 
term FM broadcast station or FM radio broadcast station refers to 
commercial and noncommercial educational FM radio broadcast stations as 
defined in Sec. 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. The coverage contour for an FM 
translator providing ``fill-in'' service is congruent with its parent 
station: For a fill-in translator for a commercial Class B station it is 
the predicted 0.5 mV/m field strength contour; for a fill-in translator 
for a commercial Cass B1 station it is the predicted 0.7 mV/m field 
strength contour; and for a fill-in translator for all other classes of 
commercial stations as well as all noncommercial educational stations it 
is the predicted 1 mV/m field strength contour. A fill-in FM 
translator's coverage contour must be contained within the primary 
station's coverage contour. 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).

[ 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]

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