§ 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]

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