Goto Section: 80.251 | 80.271 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 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
(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
(g) Demonstration of the radiotelephone installation may be required by
Commission representatives to show compliance with applicable
(h) The radiotelephone installation must be protected from excessive
currents and voltages.
(i) The radiotelephone installation must be maintained in an efficient
[ 51 FR 31213 , Sept. 2, 1986. Redesignated and amended at 68 FR 46973 ,
Aug. 7, 2003; 73 FR 4483 , Jan. 25, 2008]
Goto Section: 80.251 | 80.271
Goto Year: 2020 |
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