Sec.  23.23   Use of frequencies for radio-telegraph communication within the
continental United States.

   

   Licensees of point-to-point radiotelegraph stations may use any
   frequency authorized in a station license for communication between
   designated points within the 48 contiguous states and the District of
   Columbia upon the express condition that the use of any frequency
   above 5000 kHz shall be subject to the limitation that no interference
   shall be caused to the international service, or to service with
   Alaska or Hawaii; and in the event such interference is caused the
   licensee shall immediately discontinue the use of the frequency or
   frequencies producing such interference and operation thereon may be
   conducted only at times when such interference will not be caused.