Radios

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Radios

• How do they work?

By Amanda Deller
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How do they work?

• Radios use Radio waves to send signals to
  satellites and you hear what comes to your home
  radio.

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Parts of the radio

• There are two main parts of a radio
• Transmitter
• Reciever

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Transmitter

• Takes some type of message
• Converts it onto a sine wave
• And transmits it with radio waves

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Reciever

• Receives the radio waves
• Decodes the message from the sine wave it receives

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Radio waves!

• Form of electro magnetic radiation
• Created whenever a charged object accelerates
  with a frequency that lies in the radio frequency
• Radio frequency is part of the electromagnetic
  spectrum

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AM Radio

• AM stands for-Amplitude modulation
• AM transmitters vary the signal level smoothly in
  direct proportion to the sound they are
  transmitting
• Main disadvatage
• Many sounds in the background. ( No sounds are
  rejected)

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FM radio

• FM stands for frequency Modulation
• the effects of amplitude noise are minimized.
• no compensation for different signal levels is
  required

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Putting this all together..

• -an electrical signal is sent to an antenna
• -the antenna converts the electrical signal into
  an electromagnetic wave
• -wave travels through air
• -you hear what the radio sent
• http//en.wikipedia.org/wiki/Radio
•  

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