§  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 § 22.861, instead) and the Cellular
   Radiotelephone Service (see § 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]