Sec. 80.858  Radiotelephone receiver.

    (a) The receiver required by Sec. 80.854(a) of this part must be 
capable of reception of H3E and J3E emissions on the radiotelephone 
distress frequency. The receiver must be capable of reception of J3E 
emissions on 2638 kHz and the receiving frequencies associated with the 
transmitting frequencies authorized pursuant to Sec. 80.855(a).
    (b) In addition to the receiver required by paragraph (a) of this 
section, a radiotelephone distress frequency watch receiver meeting the 
technical standards of Sec. 80.269 must be provided.
    (c) One or more loudspeakers capable of being used to maintain the 
distress frequency (2182 kHz) watch at the principal operating position 
and at any other place where the listening watch is performed must be 
provided.
    (d) The receiver required by paragraph (a) of the section must:
    (1) Have a sensitivity of 50 microvolts;
    (2) Be capable of operation when energized by the main source of 
energy, and by the reserve source of energy if a reserve source is 
required by Sec. 80.860(a);
    (3) Be protected from excessive currents and voltages;
    (4) Be provided with a nameplate showing the name of the receiver 
manufacturer and the type or model.
    (e) The sensitivity of a receiver is the strength in microvolts of a 
signal, modulated 30 percent at 400 cycles per second, required at the 
receiver input to produce an audio output of 50 milliwatts to the 
loudspeaker with a signal-to-noise ratio of at least 6 decibels. 
Evidence of a manufacturer's rating or a demonstration of the 
sensitivity of a required receiver computed on this basis must be 
furnished upon request of a Commission representative.