81. A television composite video signal is found to contain a large number of pulses. These pulses are provided so that
82. 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
83. Perigee means
84. 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)
85. In ship to ship communication, the problem of fading can be overcome by using
86. 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:
87. The A-scope of a radar displays
88. What is the greatest allowable PRF for unambiguous reception in a radar having a maximum range of 120 km?
89. Which of the following frequencies cannot be used for reliable beyond the horizon terrestrial communications without repeaters?
90. 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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