Sec. 80.97  Radiotelegraph operating procedures.

    This section applies to ships and coast stations authorized to 
transmit in the band 405-525 kHz.
    (a) Except for the transmission of distress or urgency signals, all 
transmissions must cease within the band 485-515 kHz during each 500 kHz 
silence period.
    (b) Stations transmitting telegraphy must use the service 
abbreviations (``Q'' code) listed in Appendix 14 to the Radio 
Regulations.
    (c) The call consists of:
    (1) The call sign of the station called, not more than twice; the 
word ``DE'' and the call sign of the calling station, not more than 
twice; if useful, the frequency on which the called station should 
reply; and the letter ``K''.
    (2) If the call is transmitted twice at an interval of not less than 
one minute, it must not be repeated until after an interval of three 
minutes.
    (d) The reply to calls consists of: The call sign of the calling 
station, not more than twice; the word ``DE''; and the call sign of the 
station called, once only.