Electronic Communication Systems 2nd Edition by Roy Blake

تمرين 50

An AM transmitter operates into a 50 resistive load. The RMS voltage measured at the output is 250 V without modulation and 300 V with modulation, using a true-RMS reading meter. Find:
(a) the power with modulation
(b) the power without modulation
(c) the modulation index
(d) the peak voltage with modulation
(e) the overall efficiency with modulation if the transmitter draws 3 kW from the ac line when modulated
(f) the amount of power that will be drawn from the ac line when the transmitter is unmodulated, if the efficiency is the same as in part (e)
Figure 5.39