Which of the following is an appropriate power supply rating for a typical 50 watt output mobile FM transceiver?

Modern mobile amateur radio transceivers are designed to be installed in vehicles, which use 12-volt battery systems that typically sit at about 13.8 volts when the vehicle's alternator is charging. Therefore, a base station power supply must mimic this and provide 13.8 volts, ruling out the 24.0-volt options which could severely damage the radio. A 50-watt transmitter requires significantly more power to operate than the 50 watts of RF energy it outputs because the internal RF amplifiers are less than 100 percent efficient. In fact, generating 50 watts of RF output typically requires over 100 watts of DC input power. Using Ohm's Law (Power = Voltage x Current), dividing roughly 150 watts of total consumption by 13.8 volts yields a current draw of around 10 to 12 amperes. A 4-ampere supply would quickly overload, blow a fuse, or shut down during transmission.