§ 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.

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