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:


------------------------------------------------------------------------
                                              Maximum
                                Authorized   frequency  Type of emission
         Frequencies            bandwidth    deviation         \2\
                                  (kHz)      \1\ (kHz)
------------------------------------------------------------------------
MHz:
    25.87 to 26.03...........  40.........          10  Frequencies
    26.07 to 26.47...........  20.........           5   25.87 to
    152.8625 to 153.3575 \3\.  30/60......        5/10   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       Frequencies
    450.98125 to 450.99375...   160.860 to
    455.00625 to 455.025.....   455.950
    455.98125 to 455.99375...   MHz: A1A,
                                A1B, A1D,
                                A1E, A2A,
    Up to 12.5...............   A2B, A2D,
                                A2E, A3E,
                                F1A, F1B,
    1.5......................   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
------------------------------------------------------------------------
\1\ Applies where F1A, F1B, F1D, F1E, F2A, F2B, F2D, F2E, F3E, or F9E
  emissions are used.
\2\ Stations 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.
\3\ New 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
\4\ For 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]