P5e concept map

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  • Created by: Theex
  • Created on: 26-04-14 13:55
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  • P5e concept map
    • Microwaves
      • They undergo very little diffraction
        • This means...
        • So they can pass through the ionosphere
      • They have very short wavelengths
        • So
          • They undergo very little diffraction
            • This means...
            • So they can pass through the ionosphere
      • The transmitter and reciever must be in line of sight/ carefully aligned
      • Short wavelength radio waves
        • They have very short wavelengths
          • So
          • So the communication dish needs to be much larger
          • Frequencies above 30GHz are weakened by rain and dust due to absorption and scattering
          • They're wavelength is larger than microwaves though
            • So the communication dish needs to be much larger
        • Medium wavelength radio waves
          • Frequency lower than 30MHz
          • Due to longer wavelength
            • Reflect from the ionosphere back to Earth
        • Long wavelength radio waves
          • Due to longer wavelength
            • Reflect from the ionosphere back to Earth
          • Undergo lots of diffraction and bend around Earth
            • The receiving dish is large and curved to focus and maximise collection of signal
          • The receiving dish is large and curved to focus and maximise collection of signal
      • The transmitter and reciever must be in line of sight/ carefully aligned

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