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 band (MHz)       Frequency tolerance
                        Fixed (percent) Mobile (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

   ^1Stations 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]