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]