A television composite video signal is found to contain a large number of pulses. These pulses are provided so that
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ECE · all questionsSatellite Communication
Satellite Communication
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For an earth station transmitter with an antenna output power of 40 dBW (10,000 W), a back-off loss of 3 dB, a total branching and feeder loss of 3 dB and transmit antenna gain of 4 dB, the effective isotropic radiated power (EIRP) will be
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Perigee means
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A signal transmitted from an Earth station bounces back from a geostationary satellite, with an altitude of 35864 km from the Earth surface. The range from the Earth station is 38200 km. The round trip time is about:
(excluding processing delays and assuming c = 3 × 108 m/s)
(excluding processing delays and assuming c = 3 × 108 m/s)
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In ship to ship communication, the problem of fading can be overcome by using
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The received power of a RADAR receiving antenna whose effective area is 0.2 m2 for an available power density of 200 µW/m2 is:
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The A-scope of a radar displays
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What is the greatest allowable PRF for unambiguous reception in a radar having a maximum range of 120 km?
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Which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?
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A radar system uses TWTA as high power RF source for transmitting 300 W peak power. The efficiency of transmitter during pulse is 75% and the transmit duty is 25%. If the DC power required during pulse off period is 20 W. The average power dissipation in TWTA is
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The lowest frequency used in satellite communication is
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In radar propagation, attenuation in the clear atmosphere is seldom a serious problem at frequencies below
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A scan type radar display can
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If it takes a transmitted signal 1 m sec to go up to the target and come back after reflection, how far is the transmitter from the target?
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In Satellite antennas, the available noise from a thermal noise is given by
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As per WARC-1979 allocation, commercial communication satellites use bandwidth of
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A planet nine times far away from Sun as compared to earth, has an orbital period of
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An artificial satellite can be tracked very precisely from the earth by using-
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A satellite orbiting in 600 km orbit transmits 5 GHz frequency. The Doppler shift observed at the ground station, when the satellite is over head of the station is
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Q100
Open questionTracking radar determines
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