Sec.  74.501   Classes of aural broadcast auxiliary stations.

   (a) Aural broadcast STL station. A fixed station for the transmission of
   aural  program  material  between  the studio and the transmitter of a
   broadcasting station other than an international broadcasting station.

   (b) Aural broadcast intercity relay (ICR) station. A fixed station for the
   transmission of aural program material between radio broadcast stations,
   other than international broadcast stations, between FM radio broadcast
   stations and their co-owned FM booster stations, between noncommercial
   educational FM radio stations and their co-owned noncommercial educational
   FM translator stations assigned to reserved channels (Channels 201 to 220),
   between FM radio stations and FM translator stations operating within the
   coverage contour of their primary stations, or for such other purposes as
   authorized in  Sec. 74.531.

   (c)  Aural broadcast microwave booster station. A fixed station in the
   broadcast auxiliary service that receives and amplifies signals of an aural
   broadcast STL or intercity relay station and retransmits them on the same
   frequency.

   [ 28 FR 13716 , Dec. 14, 1963, as amended at  49 FR 7129 , Feb. 27, 1984;  53 FR 4169 , Feb. 12, 1988;  55 FR 50692 , Dec. 10, 1990;  57 FR 41111 , Sept. 9, 1992]