ECE :: Satellite Communication
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To make antenna more directional, either its size must be increased or
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India's first domestic geostationary satellite 1NSAT-IA was launched on 10th April 1982 from
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Satellite launch sites are invariably located on Eastern seaboards to ensure that
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The owner of a communication satellite is usually required to keep the spacecraft on station at its assigned place in the geosynchronous orbit with an accuracy of __________ degree.
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The number of days when Earth's shadow falls on a geosynchronous satellite is
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Of the four INSAT-I satellites planned by India so for, only __________ has proved to be successful.
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Radio broadcasting is a familiar example of
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As compared to 17.34° antenna, the total increase in the signal relayed by 4.5° antenna of INTELSAT-IV is
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Which one of the following statements regarding DSI is wrong?
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Which one of the following statements regarding compandor is FALSE?
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A.
It is a digital form of TASI
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B.
Though it is more efficient than TASI, it is much slower
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C.
A speaker has to wait (it at all) for only a few milliseconds for reallocation of channel
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D.
It has increased the capacity of satellite channels by a factor of 2.2 or more with out degrading speech quality
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A.
It compresses the higher-amplitude parts of a signal before modulation and expands them back to normal again after demodulation.
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B.
It gives preferential treatment to the weaker parts of the signal
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C.
For weaker signals it gives a poor ratio of signal strength to quantizing error
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D.
Weaker signals, traverse more quantum steps than they would do otherwise and so quantizing error is reduced.
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