Sec.  22.359   Emission limitations.

   The rules in this section govern the spectral characteristics of emissions
   in the Public Mobile Services, except for the Air-Ground Radiotelephone
   Service (see  Sec. 22.861, instead) and the Cellular Radiotelephone Service (see
    Sec. 22.917, instead).

   (a)  Out  of  band emissions. The power of any emission outside of the
   authorized  operating  frequency  ranges  must be attenuated below the
   transmitting power (P) by a factor of at least 43 + 10 log (P) dB.

   (b) Measurement procedure. Compliance with these rules is based on the use
   of measurement instrumentation employing a resolution bandwidth of 30 kHz or
   more. In the 60 kHz bands immediately outside and adjacent to the authorized
   frequency range or channel, a resolution bandwidth of at least one percent
   of the emission bandwidth of the fundamental emission of the transmitter may
   be employed. A narrower resolution bandwidth is permitted in all cases to
   improve measurement accuracy provided the measured power is integrated over
   the  full required measurement bandwidth (i.e., 30 kHz or 1 percent of
   emission bandwidth, as specified). The emission bandwidth is defined as the
   width  of  the signal between two points, one below the carrier center
   frequency and one above the carrier center frequency, outside of which all
   emissions are attenuated at least 26 dB below the transmitter power.

   (c) Alternative out of band emission limit. Licensees in the Public Mobile
   Services may establish an alternative out of band emission limit to be used
   at specified frequencies (band edges) in specified geographical areas, in
   lieu of that set forth in this section, pursuant to a private contractual
   arrangement of all affected licensees and applicants. In this event, each
   party  to such contract shall maintain a copy of the contract in their
   station files and disclose it to prospective assignees or transferees and,
   upon request, to the FCC.

   (d) Interference caused by out of band emissions. If any emission from a
   transmitter  operating in any of the Public Mobile Services results in
   interference  to users of another radio service, the FCC may require a
   greater attenuation of that emission than specified in this section.

   [ 70 FR 19308 , Apr. 13, 2005]