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Radio transmitters

A radio transmitter consists of several elements that work together to generate radio waves that contain useful information such as audio, video, or digital data.

-Power supply: provides the necessary electrical power to operate the

transmitter.

- Oscillator: creates alternating current at the frequency on which the

transmitter will transmit. The oscillator usually generates a sine wave, which is referred to as a carrier wave.

-Modulator: adds useful information to the carrier wave. There are two main

ways to add this information. The first, called amplitude modulation or AM, makes slight increases or decreases to the intensity of the carrier wave. The second, called frequency modulation or FM, makes slight increases or decreases to the frequency of the carrier wave.

-Amplifier: amplifies the modulated carrier wave to increase its power. The

more powerful the amplifier, the more powerful the broadcast.

-Antenna: converts the amplified signal to radio waves.

3. Read the text and define the role of antennas in radio communication:

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