Sec. 73.1545  Carrier frequency departure tolerances.

    (a) AM stations. The departure of the carrier frequency for 
monophonic transmissions or center frequency for stereophonic 
transmissions may not exceed plus-minus 20 Hz from the 
assigned frequency.
    (b) FM stations. (1) The departure of the carrier or center 
frequency of an FM station with an authorized transmitter output power 
more than 10 watts may not exceed plus-minus2000 Hz from the 
assigned frequency.
    (2) The departure of the carrier or center frequency of an FM 
station with an authorized transmitter output power of 10 watts or less 
may not exceed plus-minus3000 Hz from the assigned frequency.
    (c) TV stations. (1) The departure of the visual carrier frequency 
of a TV station may not exceed plus-minus1000 Hz from the 
assigned visual carrier frequency.
    (2) The departure of the aural carrier frequency of a TV station may 
not exceed plus-minus1000 Hz from the actual visual carrier 
frequency plus exactly 4.5 MHz.
    (d) International broadcast stations. The departure of the carrier 
frequency of an International broadcast station may not exceed 0.0015% 
of the assigned frequency on which the station is transmitting.

[ 44 FR 58734 , Oct. 11, 1979;  44 FR 64408 , Nov. 7, 1979, as amended at  47 FR 13165 , Mar. 29, 1982]