Question 3-59H4

Pulse modulation systems transmit radio frequency (RF) energy in short, discrete bursts or pulses. The peak transmitter power refers to the maximum power level achieved *during* these brief pulse durations. However, these pulses are often separated by significant periods of little to no transmission, meaning the system has a low "duty cycle" (the fraction of time the transmitter is actively sending a pulse). The average power is calculated over a longer period, taking into account both the high-power pulse durations and the low-power or zero-power off-periods. Therefore, due to the typically low duty cycle, the average power for a pulse modulation system is normally much lower than its peak power. Option B is incorrect because Single Sideband (SSB) voice transmitters use continuous amplitude and phase variations, not discrete RF pulses. Options C and D are incorrect because the average power in a pulse modulation system is often *substantially* lower than the peak power, frequently by factors far greater than two, due to the typically low duty cycle.