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  2. 2. Radio Waves and Telecommunications<br />Naomi Bowden<br />Tech1002<br />Z Allman Wednesday 9am<br />
  3. 3. Radio Waves<br /> Radio waves are transmitted and received using electromagnetic waves also known as radio waves.<br />Electric and magnetic fields are oscillated to determine the frequency. Frequency (oscillates per second) determine what they can be used for.<br />
  4. 4. The standard frequency bandwidth for telecommunications, including broadcast television and radio is set at between 30KHz and 300 GHz<br />( 25/01/11)<br />
  5. 5. Radio Communication using Amplitude Modulation<br />A carrier signal is used to modulate sound waves such as speech and music, rather than the frequency being modulated as in FM radio broadcasts.<br />
  6. 6. Electrical signals given off by microphones and other devices are used to vary the amplitude of the carrier wave rather than the frequency.<br />
  7. 7. How Mobile Phone Networks Use Radio Communication<br /> 60% of the UK population, around 40 million people, own and use a mobile telephone<br />
  8. 8. Mobile phones send and receive signals to and from the nearest base station. These radio waves are then sent back to the devices at a slightly different frequency which vibrate within the phones speaker so that our ears can convert the signals to voices or music.<br />
  9. 9. Base stations link phones together (both mobile and landline) and transmit the information given either through phone cables or high frequency radio links via antenna.<br />
  10. 10. References:<br /> 25/01/11<br /> 25/01/11<br />