§  5.115   Station identification.

   Each class of station in the experimental services shall, unless
   specifically exempted by the terms of the station authorization,
   transmit its assigned call sign at the end of each complete
   transmission: Provided, however, that the transmission of the call sign
   at the end of each transmission is not required for projects requiring
   continuous, frequent, or extended use of the transmitting apparatus,
   if, during such periods and in connection with such use, the call sign
   is transmitted at least once every thirty minutes. The station
   identification shall be transmitted in clear voice or Morse code. All
   digital encoding and digital modulation shall be disabled during
   station identification.