Sec.  23.13   Types of emission.

   Stations in the international fixed public radiocommunication services may
   be authorized to use any of the types of emission or combinations thereof,
   described in part 2 of this chapter, as well as new types which may be
   developed: Provided, That harmful interference to adjacent operations is not
   caused  thereby,  And  provided  further,  That the intelligence to be
   transmitted will use the bandwidth requested to a degree of efficiency
   compatible  with  the current state of the art. A determination of the
   possibilities of interference will be made as outlined in  Sec. 23.20. In certain
   cases frequencies or emissions may be authorized on a temporary basis to
   determine if interference will occur. During normal operations, emissions
   shall be centered about an assigned frequency. Non-centered emissions may be
   employed for short periods of time as needed to avoid interfering signals or
   meet fluctuating traffic loading: Provided, That the occupied bandwidth of
   these emissions be contained within the authorized bandwidth, And provided
   further , That prior to any such use, the Commission be notified of the
   reference  frequency or frequencies proposed to be used in lieu of the
   assigned frequency.

   [ 38 FR 22479 , Aug. 21, 1973]