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P1f Wireless Signals

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P1f Wireless Signals

  1. 1. P1f Wireless Technology <ul><li>How wireless technology can be used </li></ul><ul><li>How the radiation used for communications can be refracted and diffracted </li></ul><ul><li>How long-distance communications rely on reflection of waves </li></ul>
  2. 2. Wireless technology
  3. 3. Radio reception
  4. 4. Radio reception <ul><li>Masts are located in _________ places </li></ul><ul><li>You get good reception if the mast is __________ your horizon </li></ul><ul><li>Transmitters broadcast lots of different signals, they all have different _______ </li></ul>
  5. 5. How can we communicate over the horizon? Atmospheric refraction
  6. 6. How can we communicate over the horizon? Atmospheric refraction <ul><li>Waves used for communication can be ______________ </li></ul><ul><li>This happens as the _______ up or _________ down when moving to areas of air in the atmosphere with different densities </li></ul>
  7. 7. How can we communicate over the horizon? Ionospheriec reflection
  8. 8. How can we communicate over the horizon? Ionospheriec reflection <ul><li>Radio waves can be reflected by an area of charged particles high up in the atmosphere called the _____________ </li></ul><ul><li>This allows signals to travel over the horizon </li></ul><ul><li>But the height of the ionosphere varies during the day as the atmosphere heats/cools, so signal strength can vary </li></ul>
  9. 9. Satellite communications
  10. 10. Satellite communications
  11. 11. Satellite communications <ul><li>Microwaves are used because they are not ____________ by the ionosphere </li></ul><ul><li>They travel in straight lines, are received by satellites in ____________ orbits and are beamed back to earth </li></ul><ul><li>Satellite dishes increase the strength of the signal from space by __________ and ___________ it onto a receiver </li></ul>
  12. 12. Losing the signal
  13. 13. Losing the signal
  14. 14. Losing the signal <ul><li>The signal can change direction due to ____________ caused by different layers in the atmosphere </li></ul><ul><li>Microwaves are not affected by __________ </li></ul><ul><li>If the wavelength of the signal is similar to the diameter of the transmitter dish then the signal spreads out due to _____________ </li></ul><ul><li>If the dish is much bigger than the signal wavelength then there is no _____________ </li></ul>

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