Sec.  78.111   Frequency tolerance.

   Stations in this service shall maintain the carrier frequency of each
   authorized transmitter to within the following percentage of the assigned
   frequency.


------------------------------------------------------------------------
                                                     Frequency tolerance
                                                   ---------------------
               Frequency band (MHz)                   Fixed      Mobile
                                                    (percent)  (percent)
------------------------------------------------------------------------
1,990 to 2,110....................................  .........      0.005
6,425 to 6,525....................................  .........      0.005
6,875 to 7,125....................................  .........      0.005
12,700 to 13,250 \1\..............................      0.005      0.005
17,700 to 18,820..................................      0.003  .........
18,820 to 18,920..................................      0.001  .........
18,920 to 19,700..................................      0.003  .........
------------------------------------------------------------------------
\1\ Stations that employing vestigal sideband AM transmissions shall
  maintain their operating frequency within 0.0005% the visual carrier,
  and the aural carrier shall be 4.5 MHz  ±1 kHz above the visual
  carrier frequency.

   [ 52 FR 7145 , Mar. 9, 1987, as amended at  68 FR 12776 , Mar. 17, 2003]