[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: 47CFR24.133]



[Page 236]

 

                       TITLE 47--TELECOMMUNICATION

 

                    CHAPTER I--FEDERAL COMMUNICATIONS

                         COMMISSION (CONTINUED)

 

PART 24_PERSONAL COMMUNICATIONS SERVICES--Table of Contents

 

                        Subpart D_Narrowband PCS

 

Sec. 24.133  Emission limits.



    (a) The power of any emission shall be attenuated below the 

transmitter power (P), as measured in accordance with Sec. 24.132(f), 

in accordance with the following schedule:

    (1) For transmitters authorized a bandwidth greater than 10 kHz:

    (i) On any frequency outside the authorized bandwidth and removed 

from the edge of the authorized bandwidth by a displacement frequency 

(fd in kHz) of up to and including 40 kHz: at least 116 

Log10 ((fd+10)/6.1) decibels or 50 plus 10 

Log10 (P) decibels or 70 decibels, whichever is the lesser 

attenuation;

    (ii) On any frequency outside the authorized bandwidth and removed 

from the edge of the authorized bandwidth by a displacement frequency 

(fd in kHz) of more than 40 kHz: at least 43+10 

Log10 (P) decibels or 80 decibels, whichever is the lesser 

attenuation.

    (2) For transmitters authorized a bandwidth of 10 kHz:

    (i) On any frequency outside the authorized bandwidth and removed 

from the edge of the authorized bandwidth by a displacement frequency 

(fd in kHz) of up to and including 20 kHz: at least 116 x 

Log10 ((fd+5)/3.05) decibels or 

50+10xLog10 (P) decibels or 70 decibels, whichever is the 

lesser attenuation;

    (ii) On any frequency outside the authorized bandwidth and removed 

from the edge of the authorized bandwidth by a displacement frequency 

(fd in kHz) of more than 20 kHz: at least 43+10 Log 

10 (P) decibels or 80 decibels, whichever is the lesser 

attenuation.

    (b) The measurements of emission power can be expressed in peak or 

average values provided they are expressed in the same parameters as the 

transmitter power.

    (c) When an emission outside of the authorized bandwidth causes 

harmful interference, the Commission may, at its discretion, require 

greater attenuation than specified in this section.

    (d) The following minimum spectrum analyzer resolution bandwidth 

settings will be used: 300 Hz when showing compliance with paragraphs 

(a)(1)(i) and (a)(2)(i) of this section; and 30 kHz when showing 

compliance with paragraphs (a)(1)(ii) and (a)(2)(ii) of this section.



[58 FR 59183, Nov. 8, 1993. Redesignated at 59 FR 18499, April 19, 1994, 

as amended at 59 FR 14119, Mar. 25, 1994; 66 FR 10968, Feb. 21, 2001]