[Code of Federal Regulations]
[Title 47, Volume 2]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 47CFR21.101]

[Page 51]
 
                       TITLE 47--TELECOMMUNICATION
 
                    CHAPTER I--FEDERAL COMMUNICATIONS
                         COMMISSION (CONTINUED)
 
PART 21--DOMESTIC PUBLIC FIXED RADIO SERVICES--Table of Contents
 
                     Subpart C--Technical Standards
 
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 January 21, 2000, the equipment authorized to be used at
  all MDS main stations, and at all MDS booster stations authorized
  pursuant to Sec.  21.913(b) of this part, shall maintain a frequency
  tolerance of 0.001%. MDS booster stations authorized pursuant to Sec.
  21.913(e) of this part and MDS response stations authorized pursuant
  to Sec.  21.909 of this part shall employ transmitters with sufficient
  frequency stability to ensure that the emission is, at all times,
  within the required emission mask.

    (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 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; 63 FR 65101, Nov. 25, 1998; 64 FR 63730, Nov. 22, 1999]