What is the role of the amplifier in a radio transmitter?

What is the role of the amplifier in a radio transmitter?

• A. Amplifies the modulated carrier wave to increase its power.
• B. Demodulates the received signal.
• C. Filters out noise.
• D. Drives the antenna mechanically.

Answer: (A)

The main idea is that the amplifier’s job is to provide enough RF power to drive the antenna. After the information has been impressed onto the carrier, the RF amplifier boosts the strength of that modulated carrier so it can be radiated effectively over a distance. Demodulation happens at the receiver, not the transmitter. Filtering and noise reduction are typically handled by filters and other front-end stages to clean the signal, but the amplifier’s primary function is increasing power, not removing noise. Driving the antenna mechanically isn’t how RF transmission works—the amplifier supplies electrical energy to the feedline and the antenna converts that power into radio waves. So the best description is that it amplifies the modulated carrier to raise its power for transmission.

The main idea is that the amplifier’s job is to provide enough RF power to drive the antenna. After the information has been impressed onto the carrier, the RF amplifier boosts the strength of that modulated carrier so it can be radiated effectively over a distance. Demodulation happens at the receiver, not the transmitter. Filtering and noise reduction are typically handled by filters and other front-end stages to clean the signal, but the amplifier’s primary function is increasing power, not removing noise. Driving the antenna mechanically isn’t how RF transmission works—the amplifier supplies electrical energy to the feedline and the antenna converts that power into radio waves. So the best description is that it amplifies the modulated carrier to raise its power for transmission.