[Code of Federal Regulations]

[Title 47, Volume 2]

[Revised as of October 1, 2004]

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 Sec. Sec. 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]