Transmitter output power=Ep * Ip * F
Where:
Ep=DC input voltage of final radio stage.
Ip=Total DC input current of final radio stage.
F =Efficiency factor.
47 C.F.R. §73.267
Secs. 4, 5, 303, 48 Stat., as amended, 1066, 1068, 1082 ( 47 U.S.C. 154 , 155 , 303 )