§  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 ±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 ±2000 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 ±3000 Hz from the assigned frequency.

   (c) TV stations. (1) The departure of the visual carrier frequency of a
   TV station may not exceed ±1000 Hz from the assigned visual carrier
   frequency.

   (2) The departure of the aural carrier frequency of a TV station may
   not exceed ±1000 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.

   (e) Class A TV stations. The departure of the carrier frequency of
   Class A TV stations may not exceed the values specified in § 74.761 of
   this chapter. Provided, however, that Class A TV stations licensed to
   operate with a carrier offset, including those stations licensed with a
   maximum effective radiated power and/or antenna height greater than the
   values specified in their initial Class A TV station authorization,
   must comply with paragraph (c) of this section.

   Note to paragraph (e): At a date not later than nine months after
   release of the Memorandum Opinion and Order on Reconsideration in MM
   Docket No. 00-10 (the proceeding that established the Class A TV
   service), all licensed Class A stations must operate with a carrier
   frequency offset. See Memorandum Opinion and Order on Reconsideration,
   In the Matter of Establishment of a Class A Television Service, MM
   Docket No. 00-10, released April 13, 2001.

   [ 44 FR 58734 , Oct. 11, 1979;  44 FR 64408 , Nov. 7, 1979, as amended at
    47 FR 13165 , Mar. 29, 1982;  65 FR 30004 , May 10, 2000;  67 FR 21691 , May
   1, 2001]