26. A communication satellite is a repeater between
27. The ending part of the popular teleserial Mahabharat will be beamed to the viewers
28. The most effective anti jamming technique is
29. For satellite communication, standard Earth stations have antenna diameters in the range of __________ metre.
30. 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
31. In satellite communication, frequency modulation is used because satellite channel has
32. In the case of a 70-MHz IF carrier for a transponder bandwidth of 36 MHz, energy must lie between MHz.
33. Which of the following factor does NOT contribute to the drift of a geostationary satellite from its stationary position in space?
34. In communication satellites, the up-link normally operates at a higher frequency than the down-link because it
35. For global communication, the number of satellites needed is
36. The noise temperature of sky is about __________ °K.
37. 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.
38. In the context of error detection in satellite transmission, ARQ stands for
39. To cover all inhabited regions of the Earth, the number of geosynchronous communication satellites required
40. The different access methods which permit many satellite users to operate in parallel through a single transponder without interfering with each other as
41. When a communication satellite passes into Earth's shadow, its temperature drops to about __________ ° K.
42. In envelope detection of an AM waveform
43. Shannon's Law relates
44. India's first three-axis stabilised geostationary communication satellite is
45. Point out the false statement.
Launching of geostationary experimental communication satellite has helped India to gain experience in
46. A modem is
47. In synchronous detection of an AM signal
48. A typical signal strength received from a geosynchronous communication satellite is of the order of a few
49. The expression for satellite link frequencies such as 4/6 GHz denotes that
50. Assuming a minimum angle of elevation of 5°, a geosynchronous satellite remains in line-of-sight for __________ percentage of Earth's surface.