Sec. 21.101  Frequency tolerance.

    (a) The carrier frequency of each transmitter authorized in these 
services shall be maintained within the following percentage of the 
reference frequency except as otherwise provided in paragraph (b) of 
this section or in the applicable subpart of this part (unless otherwise 
specified in the instrument of station authorization the reference 
frequency shall be deemed to be the assigned frequency):

                                                                        
------------------------------------------------------------------------
                                                              Frequency 
                                                              tolerance 
                   Frequency range (MHz)                      for fixed 
                                                               stations 
                                                              (percent) 
------------------------------------------------------------------------
2,150 to 2,162 \1\ \2\.....................................        0.001
2,596 to 2,680 \2\.........................................       0.005 
------------------------------------------------------------------------
\1\ Beginning Aug. 9, 1975, this tolerance will govern the marketing of 
  equipment pursuant to Secs.  2.803 and 2.805 of this chapter and the  
  issuance of all authorizations for new radio equipment. Until that    
  date new equipment may be authorized with a frequency tolerance of    
  0.03 percent in the frequency range 2,200 to 10,500 MHz and equipment 
  so authorized may continue to be used for its life provided that it   
  does not cause interference to the operation of any other licensee.   
  Equipment authorized in the frequency range 2,450 to 10,500 MHz prior 
  to June 23, 1969, at a tolerance of 0.05 percent may continue to be   
  used until February 1, 1976 provided it does not cause interference to
  the operation of any other licensee.                                  
\2\ Beginning November 1, 1991, equipment authorized to be operated in  
  the frequency bands 2150-2162 MHz, 2596-2644 MHz, 2650-2656 MHz, 2662-
  2668 MHz, and 2674-2680 MHz for use in the Multipoint Distribution    
  Service shall maintain a frequency tolerance within +1 KHz of the     
  assigned frequency.                                                   

    (b) As an additional requirement in any band where the Commission 
makes assignments according to a specified channel plan, provisions 
shall be made to prevent the emission included within the occupied 
bandwidth from radiating outside the assigned channel at a level greater 
than that specified in Sec. 21.106.
[44 1997 FR 60534 , Oct. 19, 1979, as amended at  46 FR 23450 , Apr. 27, 1981; 
 48 FR 50329 , Nov. 1, 1983;  48 FR 50732 , Nov. 3, 1983;  49 FR 37775 , Sept. 
26, 1984;  54 FR 10327 , Mar. 13, 1989;  54 FR 24905 , June 12, 1989;  55 FR 46009 , Oct. 31, 1990;  56 FR 57816 , Nov. 14, 1991;  61 FR 26675 , May 28, 
1996]

Secs. 21.102-21.104  [Reserved]