§  87.135   Bandwidth of emission.

   (a) Occupied bandwidth is the width of a frequency band such that,
   below the lower and above the upper frequency limits, the mean powers
   emitted are each equal to 0.5 percent of the total mean power of a
   given emission.

   (b) The authorized bandwidth is the maximum occupied bandwidth
   authorized to be used by a station.

   (c) The necessary bandwidth for a given class of emission is the width
   of the frequency band which is just sufficient to ensure the
   transmission of information at the rate and with the quality required
   under specified conditions.