Goto Section: 80.909 | 80.913 | Table of Contents
Revised as of September 1, 2021
Goto Year:2020 |
§ 80.911 VHF transmitter.
(a) The transmitter must be capable of transmission of G3E emission on
156.800 MHz, 156.300 MHz, and on the ship-to-shore working frequencies
necessary to communicate with public coast stations serving the area in
which the vessel is navigated.
(b) The transmitter must be adjusted so that the transmission of speech
normally produces peak modulation within the limits 75 percent and 100
(c) The transmitter must be certificated to transmit between 20 watts
and 25 watts, on each of the frequencies 156.300 MHz, 156.800 MHz and
on ship-to-shore public correspondence channels, into 50 ohms effective
resistance when operated with a primary supply voltage of 13.6 volts
(d) When an individual demonstration of the capability of the
transmitter is necessary the output power requirements prescribed in
this paragraph must be met as follows:
(1) Measurements of primary supply voltage and transmitter output power
must be made with the equipment drawing energy only from ship's
(2) The primary supply voltage, measured at the power input terminals
to the transmitter, and the output power of the transmitter, terminated
in a matching artificial load, must be measured at the end of 10
minutes of continuous operation of the transmitter at its full power
(3) The primary supply voltage must not be less than 11.5 volts.
(4) The transmitter output power must be not less than 15 watts.
(5) For primary supply voltages, measured in accordance with the
procedures of this paragraph, greater than 11.5 volts, but less than
12.6 volts, the required transmitter output power shall be equal to or
greater than the value calculated from the formula
P = 4.375(V)−35.313
where V equals the measured primary voltage and P is the calculated
output power in watts.”
[ 51 FR 31213 , Sept. 2, 1986, as amended at 54 FR 40059 , Sept. 29, 1989;
63 FR 36607 , July 7, 1998]
Goto Section: 80.909 | 80.913
Goto Year: 2020 |
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