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]