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  .........
31,000 to 31,300..................................      0.05       0.05 
------------------------------------------------------------------------
\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&177; 1 kHz above the    
  visual carrier frequency.                                             


[ 52 FR 7145 , Mar. 9, 1987]