Electronic Communication Systems 2nd Edition by Roy Blake

تمرين 58

An AM transmitter uses high-level modulation. The RF power amplifier runs from a 12 volt source, putting out a carrier power of 75 watts, at an efficiency of 75%.
(a) What is the dc current drawn by this stage from the power supply
(b) What load impedance is required by this amplifier in order for it to deliver rated power
(c) How much power must be provided by the modulating amplifier for 100% modulation
(d) What impedance would be seen at the modulation transformer secondary