CBSE Class 12-science Answered
how signals is divided meaning space satellite were in space how this signals would be divided into the whole globe is there is frequency role which handle all this communation system or and why only fibre optics used and what is the role of bandwidth in this system pleaes exlain with draw or with examples
Asked by saggugurupal | 26 Nov, 2016, 01:29: PM
Expert Answer
Satellites work on line-of-sight communication similar to our eyes. So, a satellite will send signals and cover a part of our globe.
If the entire globe is to be covered with the signals then a single satellite will not be helpful. A series of satellites need to be placed in sync so that the job can be done.
Role of Frequency: The signals that are transmitted to and fro between the satellites and the Earth belong to the microwave frequency range. The reason is that these microwave signals can cross the ionosphere without interference. Any other frequency range will either be absorbed or reflected back by the ionosphere.
Fibre optics are not used in space communication because fibre optic cables cannot be setup for such a large distance between Earth and satellites.
Role of bandwidth: The range of frequency (bandwidth) for UPLINK between Earth and satellite is 5.925 GHz - 6.425 GHz and that of DOWNLINK between satellite and receivers on Earth is 3.7 GHz - 4.2 GHz. Now, signals are selected in bandwidths because they should not interfere between other signals of similar frequencies. That is, a satellite can work on 5.925 GHz frequency and another should then work for 5.625 GHz (say). This will avoid any interference between these two satellites.
Now, there is difference in bandwidths between Uplink and Downlink signals as well. The reason for this is these two signals should not interfere with each other while transmission otherwise it will be difficult to say which is uplink and which is downlink.
Answered by Romal Bhansali | 28 Nov, 2016, 11:40: AM
Concept Videos
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Modulation and detection of signals - Part 1 ...
This video discusses modulation and detection of signals. -
Modulation and Detection of Signals - Part 2
This video explains production and detection of amplitude modulated wave. -
Modulation and detection of signals - Part 2 ...
This video further discusses Modulation & detection of signals
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