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


- 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:


  1. B. Listen to part of a radio interview with a historian talking about Einstein. Then complete each sentence with a word or a short phrase. (Track 17, CD2)
  2. From Radio Valves to Cosmic Communications
  4. Lesson 20 Radiotelephone Procedure
  5. Radio antennas
  6. Radio Equipment
  7. Radio receivers
  8. Radio systems
  9. Radio waves
  10. The Single Channel Ground and Airborne Radio System
  11. Transmission and Reception of Radio Waves

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Angle Modulation | Radio antennas

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