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Satellite Communication



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Power received from Sun per m2 surface area of a geosynchronous satellite in nearly __________ watt


A geostationary satellite is one which


In selecting a satellite system, the First determining factor is its


The average noise temperature of Earth, as viewed from space, is __________ °K


For satellite transmission, analog signals may be converted into digital form with the help of


The degradation of satellite solar cells with time is mainly due to


Assuming earth to be a sphere of radius 6400 km and height of a geosynchronous satellite above Earth as 36000 km, the velocity of a geosynchronous satellite is __________ km/hr


Most of the communication satellites are stationed to the West of their service areas in order to reduce their


To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required


For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre


Satellite launch sites are invariably located on Eastern seaboards to ensure that


Rotation of a geosynchronous satellite means its


The most effective anti jamming technique is


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


Depending on the technique used, digitized television requires a bit rate between __________ millions


The noise temperature of sky is about __________ °K


When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K


A transponder is a satellite equipment which


The distance of a synchronous satellite from Earth's surface is __________ km


The Sun blots out the transmission of a geosynchronous satellite twice a year when satellite passes directly in front of it. This outage lasts for about


Presently, the worlds's largest and most advanced multi-purpose communication satellite is


The number of days when Earth's shadow falls on a geosynchronous satellite is


A typical signal strength received from a geosynchronous communication satellite is of the order of a few


While keeping the down-link frequency constant, the diameter of a satellite antenna is reduced byhalf.
To offer the same EIRP over the increased coverage area, the RF output power has to be increases by a factor of


A few minutes disturbance in space communications occurs twice a year during Sunblinding when __________ are in line


The present total cost per watt of power generation in geosynchronous orbit is nearly Rs


Orbital disturbances of a geosynchronous satellite are caused by the


The echo heard by a telephone user on a satellite channel can be removed by using


In communication satellites, the up-link normally operates at a higher frequency than the down-link because it


A modem is