P5e Satellite Communication
Transcript of P5e Satellite Communication
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P5e - Satellite communications
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Transmitting and receiving• Microwaves are used.• Why is a different
frequency used to send info back to Earth?
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Revision - Frequency• Frequency is…
• It is measured in…
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The ionosphere• The ionosphere is…
• Radio waves are _________ by it
• Microwaves have a ________ frequency and pass through
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Atmospheric effects
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DiffractionDiffraction
If it were not for diffraction, there would be many areas where radio waves would not reach.
Waves can still be detected even when they cannot travel in a straight line, from where they are being produced, to where they are to be received. This is because waves can be diffracted.
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DiffractionDiffractionThe size of the gap affects the amount that the waves are diffracted.
A large gap producessmall diffraction.
A small gap produceslarge diffraction.
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DiffractionDiffractionThe size of the gap affects the amount that the waves are diffracted.
A large gap produces
small diffraction. A small gap produces
large diffraction.
Radio waves diffract easily and so they are very suitable for broadcasting.
Long wave radio waves have a very long transmission range because they diffract around hills and over the horizon.
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Diffraction of waves
Don’t despair if you live behind a big hill!
Short wave
Long wave
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Diffraction of waves at the dishShort wave Long wave
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Amplitude modulation (AM)
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Frequency modulation (FM)