Sec. 80.913  Radiotelephone receivers.

    (a) If a medium frequency radiotelephone installation is provided, 
the watch receiver must be capable of effective reception of J3E 
emissions, be connected to the antenna system specified by Sec. 80.923, 
and be preset to, and capable of accurate and convenient selection of, 
the frequencies 2182 kHz, 2638 kHz, and the receiving frequency(s) of 
public coast stations serving the area in which the vessel is navigated.
    (b) If a single sideband radiotelephone installation is provided, 
the receiver must be capable of reception of H3E and J3E emissions on 
2182 kHz and J3E emission on any receiving frequency authorized pursuant 
to Sec. 80.909 of this part.
    (c) If a very high frequency radiotelephone installation is 
provided, the receiver used for maintaining the watch required by 
Sec. 80.303 must be capable of effective reception of G3E emission, be 
connected to the antenna system specified by Sec. 80.923 and be preset 
to, and capable of selection of, the frequencies 156.300 MHz, 156.800 
MHz, and the receiving frequency(s) of public coast stations serving the 
area in which the vessel is navigated.
    (d) One or more loudspeakers must be provided to permit reception on 
2182 kHz or 156.800 MHz at the principal operating position and at any 
other place where listening is performed.
    (e) Any receiver provided as a part of the radiotelephone 
installation must have a sensitivity of at least 50 microvolts in the 
case of MF equipment, and 1 microvolt in the case of HF or VHF 
equipment.
    (f) The receiver required in paragraphs (a), (b) or (c) of this 
section must be capable of efficient operation when energized by the 
main source of energy. When a reserve source of energy is required 
pursuant to Sec. 80.905 or Sec. 80.917 of this part, the receiver must 
also be capable of efficient operation when energized by the reserve 
source of energy.
    (g) The sensitivity of a receiver is the strength in microvolts of a 
signal, modulated 30 percent at 400 Hertz, 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 the Commission.
[ 51 FR 31213 , Sept. 2, 1986, as amended at  56 FR 19302 , Apr. 26, 1991]