§  80.859   Main power supply.

   (a) The main power supply must simultaneously energize the
   radiotelephone transmitter at its required antenna power and the
   required receivers. Under this load condition the voltage of the main
   power supply at the radiotelephone input terminals must not deviate
   from its rated potential by more than 10 percent on ships completed on
   or after July 1, 1941, nor by more than 15 percent on ships completed
   before that date.

   (b) Means must be provided for charging any batteries used as a main
   power supply. A continuous indication of the rate and polarity of the
   charging current must be provided during charging of the batteries.

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