Sec. 90.209  Bandwidth limitations.

    (a) Each authorization issued to a station licensed under this part 
will show an emission designator representing the class of emission 
authorized. The designator will be prefixed by a specified necessary 
bandwidth. This number does not necessarily indicate the bandwidth 
occupied by the emission at any instant. In those cases where Sec. 2.202 
of this chapter does not provide a formula for the computation of 
necessary bandwidth, the occupied bandwidth, as defined in part 2 of 
this

[[Page 460]]

chapter, may be used in lieu of the necessary bandwidth.
    (b) The maximum authorized single channel bandwidth of emission 
corresponding to the type of emission specified in Sec. 90.207 is as 
follows:
    (1) For A1A or A1B emissions, the maximum authorized bandwidth is 
0.25 kHz. The maximum authorized bandwidth for type A3E emission is 8 
kHz.
    (2) For operations below 25 MHz utilizing J3E emission, the 
bandwidth occupied by the emission shall not exceed 3000 Hz. The 
assigned frequency will be specified in the authorization. The 
authorized carrier frequency will be 1400 Hz lower in frequency than the 
assigned frequency. Only upper sideband emission may be used. In the 
case of regularly available double sideband radiotelephone channels, an 
assigned frequency for J3E emissions is available either 1600 Hz below 
or 1400 Hz above the double sideband radiotelephone assigned frequency.
    (3) For all other types of emissions, the maximum authorized 
bandwidth shall not be more than that normally authorized for voice 
operations.
    (4) Where a frequency is assigned exclusively to a single licensee, 
more than a single emission may be used within the authorized bandwidth. 
In such cases, the frequency stability requirements of Sec. 90.213 must 
be met for each emission.
    (5) Unless specified elsewhere, channel spacings and bandwidths that 
will be authorized in the following frequency bands are given in the 
following table.

                   Standard Channel Spacing/Bandwidth                   
------------------------------------------------------------------------
                                               Channel                  
            Frequency band (MHz)               spacing     Authorized   
                                                (kHz)    bandwidth (kHz)
------------------------------------------------------------------------
Below 25 \2\................................                            
25-50.......................................     20              20     
72-76.......................................     20              20     
150-174.....................................  \1\ 7.5     1,3 20/11.25/6
220-222.....................................      5               4     
421-512 \2\.................................  \1\ 6.25    1,3 20/11.25/6
806-821/851-866.............................     25              20     
821-824/866-869.............................     12.5            20     
896-901/935-940.............................     12.5            13.6   
902-928 \4\.................................                            
929-930.....................................     25              20     
1427-1435 \2\...............................                            
2450-2483.52 \2\............................                            
Above 2500 \2\..............................                            
------------------------------------------------------------------------
\1\ For stations authorized on or after August 18, 1995.                
\2\ Bandwidths for radiolocation stations in the 420-450 MHz band and   
  for stations operating in bands subject to this footnote will be      
  reviewed and authorized on a case-by-case basis.                      
\3\ Operations using equipment designed to operate with a 25 kHz channel
  bandwidth will be authorized a 20 kHz bandwidth. Operations using     
  equipment designed to operate with a 12.5 kHz channel bandwidth will  
  be authorized a 11.25 kHz bandwidth. Operations using equipment       
  designed to operate with a 6.25 kHz channel bandwidth will be         
  authorized a 6 kHz bandwidth.                                         
\4\ The maximum authorized bandwidth shall be 12 MHz for non-           
  multilateration LMS operations in the band 909.75-921.75 MHz and 2 MHz
  in the band 902.00-904.00 MHz. The maximum authorized bandwidth for   
  multilateration LMS operations shall be 5.75 MHz in the 904.00-909.75 
  MHz band; 2 MHz in the 919.75-921.75 MHz band; 5.75 MHz in the 921.75-
  927.25 MHz band and its associated 927.25-927.50 MHz narrowband       
  forward link; and 8.00 MHz if the 919.75-921.75 MHz and 921.75-927.25 
  MHz bands and their associated 927.25-927.50 MHz and 927.50-927.75 MHz
  narrowband forward links are aggregated.                              

[ 60 FR 37263 , July 19, 1995]