Sec. 74.1236  Emission and bandwidth.

    (a) The license of a station authorized under this subpart allows 
the transmission of either F3 or other types of frequency modulation 
(see Sec. 2.201 of this chapter) upon a showing of need, as long as the 
emission complies with the following:
    (1) For transmitter output powers no greater than 10 watts, 
paragraphs (b), (c), and (d) of this section apply.
    (2) For transmitter output powers greater than 10 watts, Sec. 73.317 
(a), (b), (c), and (d) apply.
    (b) Standard width FM channels will be assigned and the transmitting 
apparatus shall be operated so as to limit spurious emissions to the 
lowest practicable value. Any emissions including intermodulation 
products and radiofrequency harmonics which are not essential for the 
transmission of the desired aural information shall be considered to be 
spurious emissions.
    (c) The power of emissions appearing outside the assigned channel 
shall be attenuated below the total power of the emission as follows:

                                                                        
------------------------------------------------------------------------
                                                               Minimum  
                                                             attenuation
         Distance of emission from center frequency             below   
                                                             unmodulated
                                                               carrier  
------------------------------------------------------------------------
120 to 240 kHz.............................................        25 dB
Over 240 and up to 600 kHz.................................        35 dB
Over 600 kHz...............................................        60 dB
------------------------------------------------------------------------

    (d) Greater attenuation than that specified in paragraph (c) of this 
section may be required if interference results outside the assigned 
channel.

[ 35 FR 15388 , Oct. 2, 1970, as amended at  52 FR 31406 , Aug. 20, 1987;  55 FR 50698 , Dec. 10, 1990]