§  22.917   Emission limitations for cellular equipment.

   The rules in this section govern the spectral characteristics of
   emissions in the Cellular Radiotelephone Service.

   (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
   100 kHz or greater. In the 1 MHz bands immediately outside and adjacent
   to the frequency block 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. 100 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 this service
   may establish an alternative out of band emission limit to be used at
   specified band edge(s) 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 this service results in interference to
   users of another radio service, the FCC may require a greater
   attenuation of that emission than specified in this section.

   [ 67 FR 77191 , Dec. 17, 2002]