What type of modulation varies the instantaneous power level of the RF signal?
Power modulation
Phase modulation
Frequency modulation
Amplitude modulation✓Bonne réponse
Explication
Amplitude modulation varies the carrier amplitude, and RF power varies as the square of amplitude, so the instantaneous power level follows the modulation. Angle modulation (FM and PM) keeps the envelope constant, so its power level does not change with modulation.