§ 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 § § 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 log10
   (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]

   return arrow Back to Top