write short notes on modulation and demodulation, space communication, advantage and disadvantage of satellite?
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: Through satellite transmission, coverage over geographical area is quite large mainly for sparsely populated areas. High bandwidth. Wireless and mobile communication applications can be easily established by satellite communication independent of location
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write short notes on modulation and demodulation, space communication, advantage and disadvantage of satellite?
1) Modulation is the process of converting data into radio waves by adding information to an electronic or optical carrier signal. A carrier signal is one with a steady waveform -- constant height, or amplitude, and frequency.
2) Demodulation is extracting the original information-bearing signal from a carrier wave. A demodulator is an electronic circuit (or computer program in a software-defined radio) that is used to recover the information content from the modulated carrier wave.
3) The transmission of information between the earth and spacecraft, between two or more points on the earth via spacecraft or using artificial means located in space (a belt of needles, a cloud of ionized particles, and so on), and between two or more spacecraft.
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