Sec. 80.1015  Power supply.

    (a) There must be readily available for use under normal load 
conditions, a power supply sufficient to simultaneously energize the 
bridge-to-bridge transmitter at its required antenna power, and the 
bridge-to-bridge receiver. Under this load condition the voltage of the 
power supply at the power input terminals of the bridge-to-bridge 
radiotelephone installation must not deviate from its rated voltage by 
more than 10 percent on vessels completed on or after March 1, 1957, nor 
by more than 15 percent on vessels completed before that date.
    (b) When the power supply for a nonportable bridge-to-bridge 
radiotelephone installation consists of or includes batteries, they must 
be installed as high above the bilge as practicable, secured against 
shifting with motion of the vessel, and accessible with not less than 26 
cm (10 in.) head room.
    (c) Means must be provided for adequately charging any rechargeable 
batteries used in the vessel's bridge-to-bridge radiotelephone 
installation. There must be provided a device which will give a 
continuous indication of the charging current during charging.
[ 51 FR 31213 , Sept. 2, 1986, as amended at  58 FR 44954 , Aug. 25, 1993]