6.9 how a radio works

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6.9 how a radio works

  1. 1. 6.9 How radio works January 29, 2015 What is this image? What other information can you get from it?
  2. 2. Aims • Review knowledge of AC • State the difference between AM and FM • Describe how a simple radio works
  3. 3. Sending sounds by radio RF Oscillator Modulator Amplifier Microphone AF signal RF carrier Modulated RF carrier
  4. 4. Sending sounds by radio Amplifier demodulator Tuning circuit Loudspeaker AF signal Modulated RF carrier
  5. 5. Radio gaga • AF signal: varying voltage • RF oscillator creates high frequency AC, this is the carrier • AF signals modulate the RF waves • RF wave is then amplified • RF waves then generate a voltage in the aerial • The tuning circuit decides which frequency of RF carrier to detect • The demodulator then removes the carrier wave leaving on AF • This is amplified and then converted to sound
  6. 6. AM and FM • This is amplitude modulation or AM • You can also use frequency modulation (FM) • FM has less noise so this is better

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