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. 99.132(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+10 x 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 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 9, 1994, 
as amended at  59 FR 14119 , Mar. 25, 1994]