§ 80.268   Technical requirements for radiotelephone installation.

   All radiotelephone installations in radiotelegraph equipped vessels must
   meet the following conditions.

   (a) The radiotelephone transmitter must be capable of transmission of A3E or
   H3E  emission  on 2182 kHz and must be capable of transmitting clearly
   perceptible  signals  from  ship  to ship during daytime, under normal
   conditions over a range of 150 nautical miles when used with an antenna
   system in accordance with paragraph (c) of this section. The transmitter
   must:

   (1) Have a duty cycle which allows for transmission of the radiotelephone
   alarm signal described in § 80.221.

   (2) Provide 25 watts carrier power for A3E emission or 60 watts peak power
   on H3E emission into an artificial antenna consisting of 10 ohms resistance
   and 200 picofarads capacitance or 50 ohms nominal impedance to demonstrate
   compliance with the 150 nautical mile range requirement.

   (3) Have a visual indication whenever the transmitter is supplying power to
   the antenna.

   (4) Have a two-tone alarm signal generator that meets § 80.221.

   (5) This transmitter may be contained in the same enclosure as the receiver
   required by paragraph (b) of this section. These transmitters may have the
   capability to transmit J2D or J3E transmissions.

   (b)(1) The radiotelephone receiver must receive A3E and H3E emissions when
   connected to the antenna system specified in paragraph (c) this section and
   must be preset to 2182 kHz. The receiver must additionally:

   (i) Provide an audio output of 50 milliwatts to a loudspeaker when the RF
   input is 50 microvolts. The 50 microvolt input signal must be modulated 30
   percent at 400 Hertz and provide at least a 6 dB signal-to-noise ratio when
   measured in the rated audio bandwidth.

   (ii) Be equipped with one or more loudspeakers capable of being used to
   maintain a watch on 2182 kHz at the principal operating position or in the
   room from which the vessel is normally steered.

   (2) This receiver may be contained in the same enclosure as the transmitter
   required by paragraph (a) of this section. These receivers may have the
   capability to receive J2D or J3E transmissions.

   (c)  The  antenna system must be as nondirectional and efficient as is
   practicable for the transmission and reception of radio ground waves over
   seawater. The installation and construction of the required antenna must
   ensure, insofar as is practicable, proper operation in time of emergency. If
   the required antenna is suspended between masts or other supports subject to
   whipping, a safety link must be installed which under heavy stress will
   reduce  breakage of the antenna, the halyards, or any other supporting
   elements.

   (d) The radiotelephone installation must be provided with a device for
   permitting changeover from transmission to reception and vice versa without
   manual switching.

   (e) An artificial antenna must be provided to permit weekly checks, without
   causing  interference,  of  the  automatic  device  for generating the
   radiotelephone alarm signal on frequencies other than the radiotelephone
   distress frequency.

   (f) The radiotelephone installation must be located in the radiotelegraph
   operating room or in the room from which the ship is normally steered.

   (g) Demonstration of the radiotelephone installation may be required by
   Commission representatives to show compliance with applicable regulations.

   (h)  The  radiotelephone installation must be protected from excessive
   currents and voltages.

   (i) The radiotelephone installation must be maintained in an efficient
   condition.

   [ 51 FR 31213 , Sept. 2, 1986. Redesignated and amended at  68 FR 46973 , Aug.
   7, 2003;  73 FR 4483 , Jan. 25, 2008]

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