Sec. 23.15  Emission limitations.

    (a) For all transmitters placed into operation after September 19, 
1973, and for all transmitters after September 19, 1975, which operate 
on frequencies below 30 MHz:
    (1) The occupied bandwidth of emission shall be confined within the 
least possible spectrum space consistent with the state of the art and 
the required quality of transmission, and in no event shall be more than 
the authorized bandwidth.
    (2) Spurious emissions of transmitters of mean power of 50 kilowatts 
or less shall be attenuated at least 40 decibels below the mean power of 
the fundamental without exceeding the power of 50 milliwatts.
    (3) Spurious emissions of transmitters of mean power exceeding 50 
kilowatts shall be attenuated at least 60 decibels below the mean power 
of the fundamental and every effort should be made to keep the level of 
spurious emissions below the power of 50 milliwatts.
    (b) For all transmitters placed into operation after September 19, 
1973, and for all transmitters after September 19, 1975, which operate 
on frequencies above 30 MHz, the mean powers of emissions shall be 
attenuated below the mean output power of the transmitter in accordance 
with the following schedule:
    (1) On any frequency removed from the assigned frequency by more 
than 50 percent up to and including 100 percent of the authorized 
bandwidth: At least 25 decibels;
    (2) On any frequency removed from the assigned frequency by more 
than 100 percent up to and including 250 percent of the authorized 
bandwidth: at least 35 decibels;
    (3) On any frequency removed from the assigned frequency by more 
than 250 percent of the authorized bandwidth: at least 43 plus 10 log 
(mean output power in watts) decibels, or 80 decibels, whichever is the 
lesser attenuation.
    (c) When an emission outside of the authorized bandwidth causes 
harmful interference, the Commission may, at its discretion, require 
greater attenuation than that specified in this section.
[ 38 FR 22479 , Aug. 21, 1973;  38 FR 24901 , Sept. 11, 1973]