RF PREP // FCC AMATEUR RADIO

T4 · Amateur Radio Practices

Technician · correct answers only, in question-pool order.

T4A01

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

Answer13.8 volts at 12 amperes.

A typical mobile transceiver is designed around nominal automotive-system voltage and can draw substantial current while transmitting.

T4A03

AnswerTo minimize voltage drop when transmitting.

Transmit current can be high. Short, heavy conductors reduce resistance and keep more of the supply voltage at the radio.

T4A05

AnswerIn the feed line, between the transmitter and antenna.

RF power and SWR instruments must sample the RF traveling on the transmission line, so they belong in series with the feed line.