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]