Sec.  74.462   Authorized bandwidth and emissions.

   (a) Each authorization for a new remote pickup broadcast station or system
   shall require the use of certificated equipment and such equipment shall be
   operated in accordance with emission specifications included in the grant of
   certification and as prescribed in paragraphs (b), (c), and (d) of this
   section.

   (b) The maximum authorized bandwidth of emissions corresponding to the types
   of emissions specified below, and the maximum authorized frequency deviation
   in the case of frequency or phase modulated emission, shall be as follows:
   Frequencies Authorized bandwidth
   (kHz) Maximum frequency deviation^1
   (kHz) Type of emission^2
   MHz:
   25.87 to 26.03
   26.07 to 26.47
   152.8625 to 153.3575^3 40
   20
   30/60 10
   5
   5/10 Frequencies 25.87 to 153.3575 MHz: A3E, F1E, F3E, F9E.
   160.860 to 161.400 60 10
   161.625 to 161.775 30 5
   166.25 and 170.15^4 12.5/25 5
   450.00625 to 450.025
   450.98125 to 450.99375
   455.00625 to 455.025
   455.98125 to 455.99375


   Up to 12.5


   1.5 Frequencies 160.860 to 455.950 MHz: A1A, A1B, A1D, A1E, A2A, A2B, A2D,
   A2E, A3E, F1A, F1B, F1D, F1E, F2A, F2B, F2D, F2E, F3E, F9E
   450.03125 to 450.61875
   455.03125 to 455.61875 Up to 25 5
   450.6375 to 450.8625
   455.6375 to 455.8625 25–50 10
   450.900, 450.950
   455.900, 455.950 50–100 35

   ^1Applies  where  F1A,  F1B, F1D, F1E, F2A, F2B, F2D, F2E, F3E, or F9E
   emissions are used.

   ^2Stations operating above 450 MHz shall show a need for employing A1A, A1B,
   A1D, A1E, A2A, A2B, A2D, A2E, F1A, F1B, F1D, F1E, F2A, F2B, F2D, or F2E
   emission.

   ^3New or modified licenses for use of the frequencies will not be granted to
   utilize transmitters on board aircraft, or to use a bandwidth in excess of
   30 kHz and maximum deviation exceeding 5 kHz

   ^4For stations licensed or applied for before April 16, 2003, the sum of the
   bandwidth of emission and tolerance on frequencies 166.25 MHz or 170.15 MHz
   shall not exceed 25 kHz, and such operation may continue until January 1,
   2005. For new stations licensed or applied for on or after April 16, 2003,
   the sum of the bandwidth of emission and tolerance on these frequencies
   shall not exceed 12.5 kHz. For all remote pickup broadcast stations, the sum
   of the bandwidth of emission and tolerance on these frequencies shall not
   exceed 12.5 kHz on or after January 1, 2005.

   (c) For emissions on frequencies above 25 MHz with authorized bandwidths up
   to 30 kHz, the emissions shall comply with the emission mask and transient
   frequency behavior requirements of  Sec.  Sec. 90.210 and 90.214 of this chapter. For
   all other emissions, the mean power of emissions shall be attenuated below
   the mean output power of the transmitter in accordance with the following
   schedule:

   (1) On any frequency removed from the assignment frequency by more than 50
   percent up to and including 100 percent of the authorized bandwidth: at
   least 25 dB:

   (2) On any frequency removed from the assigned frequency by more than 100
   percent up to and including 250 percent of the authorized bandwidth: at
   least 35 dB;

   (3) On any frequency removed from the assigned frequency by more than 250
   percent on the authorized bandwidth; at least 43 plus 10 log^10 (mean output
   power, in watts) dB.

   (d) In the event a station's emissions outside its authorized channel cause
   harmful interference, the Commission may, at its discretion, require the
   licensee to take such further steps as may be necessary to eliminate the
   interference.

   Note: The measurements of emission power can be expressed in peak or mean
   values provided they are expressed in the same parameters as the unmodulated
   transmitter carrier power.

   (Sec. 5, 48 Stat. 1068; 47 U.S.C. 155)

   [ 41 FR 29686 , July 19, 1976, as amended at  41 FR 32429 , Aug. 3, 1976;  41 FR 35068 , Aug. 19, 1976;  43 FR 14662 , Apr. 7, 1978;  43 FR 38391 , Aug. 28, 1978;
    44 FR 65765 , Nov. 15, 1979;  56 FR 28498 , June 21, 1991;  63 FR 36604 , July 7,
   1998;  68 FR 12765 , Mar. 17, 2003;  68 FR 25540 , May 13, 2003]