When a radiotelephone transmitter is 100%...

Question 1 / 27070D52xD4E4lPWDODcKUyBo

Question 1 of 27070D52xD4E4lPWDODcKUyBo

When a radiotelephone transmitter is 100% modulated by sinusoidal waveform , how much antenna current will be observed?

Question 1 of 27070

When a radiotelephone transmitter is 100% modulated by sinusoidal waveform , how much antenna current will be observed?

🔍 Key Concepts

• 100% modulation of a carrier by a single (sinusoidal) audio tone • Relationship between carrier power and sideband power in amplitude modulation (AM) • How antenna current is related to RF power (I ∝ √P)

💭 Think About

• For a carrier that is 100% amplitude-modulated by a single sine wave, what happens to the total RF power in the carrier-plus-sidebands compared to the unmodulated carrier? • If power changes by a certain percentage, how does that translate into a percentage change in antenna current, given that current is proportional to the square root of power? • Which options (increase, decrease, no change) are consistent with the physics of adding sideband power to a carrier in AM?

✅ Before You Answer

• First determine the percentage increase in total RF power at 100% modulation for a single-tone AM signal. • Then convert that power change to a current change using I_new / I_old = √(P_new / P_old). • Check whether your calculated percentage change in current matches one of the answer choices (pay attention to increase vs decrease).

Question 1 of 27070

When a radiotelephone transmitter is 100% modulated by sinusoidal waveform , how much antenna current will be observed?

22.5 % increase

22.5 % decrease

12.25% increase

No change in antenna current