Sec. 74.462  Authorized bandwidth and emissions.

    (a) Each authorization for a new remote pickup broadcast station or 
system issued pursuant to an application accepted after (one year 
following the

[[Page 399]]

effective date of these rules) shall require the use of type accepted 
equipment and such equipment shall be operated in accordance with 
emission specifications included in the type acceptance grant and as 
prescribed in paragraphs (b), (c), and (d) of this section.
    (b) The maximum authorized bandwidth of emissions corresponding to 
the types of emissions specified below, and the maximum authorized 
frequency deviation in the case of frequency or phase modulated 
emission, shall be as follows:

                                                                                                
                
------------------------------------------------------------------------------------------------
----------------
                                                                  Maximum                       
                
                                                  Authorized     frequency                      
                
            Frequencies (megahertz)             bandwidth \1\  deviation \2\       Type of emiss
ion \3\ \4\     
                                                 (kilohertz)    (kilohertz)                     
                
------------------------------------------------------------------------------------------------
----------------
25.87 to 26.03................................            40             10   A3, F3, F3Y, F9   
                
26.07 to 26.47................................            20              5   A3, F3, F3Y, F9   
                
152.87 to 153.35 \5\..........................         30/60           5/10   A3, F3, F3Y, F9   
                
160.89 to 161.37..............................            60             10   A1, A2, A3, F1, F2
, F3, F3Y, F9   
161.64 to 161.76..............................            30              5   A1, A2, A3, F1, F2
, F3, F3Y, F9   
166.25 to 170.15..............................            25              5   A1, A2, A3, F1, F2
, F3, F3Y, F9   
450 to 455.99 (10 kHz channels)...............            10            1.5   A1, A2, A3, F1, F2
, F3, F9        
450.0875 to 455.6125 (25 kHz channels)........            25              5   A1, A2, A3, F1, F2
, F3, F3Y, F9   
450.05 to 455.85 (50 kHz channels)............            50             10   A1, A2, A3, F1, F2
, F3Y, F9       
450.925 and 455.925 (100 kHz channels)........           100             35   A1, A2, A3, F1, F2
, F3, F3Y, F9   
------------------------------------------------------------------------------------------------
----------------
\1\ Notwithstanding the authorized bandwidths shown in the table, not more than 20 kHz bandwidth
 will be        
  authorized in the case of F3Y emission.                                                       
                
\2\ Applies where class F1, F2, F3, or F9 emission is used.                                     
                
\3\ Stations operating above 450 MHz shall show a need for employing A1, A2, F1, or F2 emission.
                
\4\ The emission designators shown in the table no longer conform to those contained in subpart 
C of part 2 of  
  the Commission's Rules and Regulations. They will be so-conformed after necessary modification
s to broadcast  
  auxiliary application processing programs are completed. For transmitting equipment which is t
ype accepted,   
  emission designators will appear in the Commission's Radio Equipment List. Equipment approved 
for emissions   
  contained in subpart C of part 2 may be used by part 74 stations if their emissions are equiva
lent to the     
  previous emission designators shown in the table.                                             
                
\5\ New or modified licenses for use of the frequencies will not be granted to utilize transmitt
ers on board    
  aircraft, or to use a bandwidth in excess of 3 kHz and maximum deviation exceeding 5 kHz.     
                

    (c) The mean power 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 assignment frequency by more 
than 50 percent up to and including 100 percent of the authorized 
bandwidth: at least 25 dB:
    (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 dB;
    (3) On any frequency removed from the assigned frequency by more 
than 250 percent on the authorized bandwidth; at least 43 plus 10 
log10 (mean output power, in watts) dB.
    (d) In the event a station's emissions outside its authorized 
channel cause harmful interference, the Commission may, at its 
discretion, require the licensee to take such further steps as may be 
necessary to eliminate the interference.
    (e) The maximum authorized bandwidth for stations operating on 1606, 
1622, or 1646 kHz shall be 10 kHz and operations on these frequencies 
shall be limited to A3 emission only.
    (f) For those transmitters using the F3Y emission and operating in 
the frequency range between 25.87 MHz and 170.15 MHz, the power of any 
emission shall be attenuated below the unmodulated carrier power (P) in 
accordance with the following schedule:
    (1) On any frequency removed from the center of the authorized 
bandwidth by a displacement frequency (Fd in kHz) of more 
than 5 kHz, up to and including 10 kHz: At least 83 Log10 
(Fd/5) decibels;
    (2) On any frequency removed from the center of the authorized 
bandwidth by a displacement frequency (Fd in kHz) of more 
than 10 kHz, up to and including 250 percent of the authorized 
bandwidth: At least 29 Log10 ((Fd)exp2/11) 
decibels or 50 decibels, whichever is the lesser attenuation.
    (3) On any frequency removed from the center of the authorized 
bandwidth by more than 250 percent of the authorized bandwidth: At least 
43 plus 10 Log10 (output power in watts) decibels

[[Page 400]]

or 80 decibels, whichever is the lesser attenuation.
    (g) For those transmitters using the F3Y emission and operating in 
the frequency range between 450.01 MHz and 455.925 MHz, the power of any 
emission shall be attenuated below the unmodulated carrier power (P) in 
accordance with the following schedule:
    (1) On any frequency removed from the center of the authorized 
bandwidth by a displacement frequency (Fd in kHz) of more 
than 5 kHz, up to and including 10 kHz: At least 83 Log10 
(Fd/5) decibels;
    (2) On any frequency removed from the center of the authorized 
bandwidth by a displacement frequency (Fd in kHz) of more 
than 10 kHz, up to and including 250 percent of the authorized 
bandwidth: At least 116 Log10 (Fd/6.1) decibels or 
70 decibels, whichever is the lesser attenuation.
    (3) On any frequency removed from the center of the authorized 
bandwidth by more than 250 percent of the authorized bandwidth: At least 
43 + 10 Log10 (output power in watts) decibels or 80 
decibels, whichever is the lesser attenuation.

    Note: The measurements of emission power can be expressed in peak or 
mean values provided they are expressed in the same parameters as the 
unmodulated transmitter carrier power.

(Sec. 5, 48 Stat. 1068; 47 U.S.C. )

[41 155 FR 29686 , July 19, 1976, as amended at  41 FR 32429 , Aug. 3, 1976;  41 FR 35068 , Aug. 19, 1976;  43 FR 14662 , Apr. 7, 1978;  43 FR 38391 , Aug. 
28, 1978;  44 FR 65765 , Nov. 15, 1979;  56 FR 28498 , June 21, 1991]