Sec.  80.121   Public coast stations using telegraphy.

   (a) Narrow-band direct-printing (NB-DP) operating procedures. (1) When both
   terminals of the NB-DP circuit are satisfied that the circuit is in operable
   condition, the message preamble must be transmitted in the following format:

   (i) One carriage return and one line feed,

   (ii) Serial number or number of the message,

   (iii) The name of the office of origin,

   (iv) The number of words,

   (v) The date of handing in of the message,

   (vi) The time of handing in of the message, and

   (vii) Any service instructions. (See The ITU “Manual for Use by the Maritime
   Mobile and Maritime Mobile-Satellite Services”.)

   (2) Upon completion of transmission of the preamble, the address, text and
   signature must be transmitted as received from the sender.

   (3) Upon completion of transmission of the signature the coast station must,
   following the signal “COL”, routinely repeat all service indications in the
   address and for figures or mixed groups of letters, figures or signs in the
   address, text or signature.

   (4) In telegrams of more than 50 words, routine repetition must be given at
   the end of each page.

   (5) Paragraphs (a) (1) through (4) of this section need not be followed when
   a direct connection is employed.

   (6) In calling ship stations by narrow-band direct-printing, the coast
   station must use the ship station selective calling number (5 digits) and
   its assigned coast station identification number (4 digits). Calls to ship
   stations must employ the following format: Ship station selective call
   number, repeated twice; “DE”, sent once; and coast station identification
   number, repeated twice. When the ship station does not reply to a call sent
   three times at intervals of two minutes, the calling must cease and must not
   be renewed until after an interval of fifteen minutes.

   (7) A public coast station authorized to use NB-DP frequencies between 4000
   kHz and 27500 kHz may use class A1A emission on the “mark” frequency for
   station identification and for establishing communications with ship
   stations. The radio station license must reflect authority for this type of
   operation, and harmful interference must not be caused.

   (b) Watch on ship calling frequencies. (1) Public coast stations using
   telegraphy must maintain a continuous watch during their working hours for
   calls from ship stations on frequencies in the same band(s) in which the
   coast station is licensed to operate. See subpart H of this part.

   (2) Such station must employ receivers which are capable of being accurately
   set to any designated calling frequency in each band for which the receiver
   is intended to operate. The time required to set the receiver to a frequency
   must not exceed five seconds. The receiver must have a long term frequency
   stability of not more than 50 Hz and a minimum sensitivity of two microvolts
   across receiver input terminals of 50 ohms, or equivalent. The audio
   harmonic distortion must not exceed five percent at any rated output power.

   (c) Radiotelegraph frequencies. Radiotelegraph frequencies available for
   assignment to public coast stations are contained in subpart H of this part.