51. If the PRF is 1200 and the pulse width is 1.5 µs, the duty cycle will be
52. Consider the following statements regarding communication by geostationary satellites:
1. A back and forth telephone transmission involves nearly half a second.
2. Since the ground station antenna points towards a fixed direction, large corrections are necessary to compensate for orbital variation and atmospheric diffraction.
3. Since the satellite antenna is limited in size, the earth are illuminated by the beam is also small.
4. As there is no Doppler shift, no correction for frequency is necessary.
Select the correct answer out of these statements.
1. A back and forth telephone transmission involves nearly half a second.
2. Since the ground station antenna points towards a fixed direction, large corrections are necessary to compensate for orbital variation and atmospheric diffraction.
3. Since the satellite antenna is limited in size, the earth are illuminated by the beam is also small.
4. As there is no Doppler shift, no correction for frequency is necessary.
Select the correct answer out of these statements.
53. One of the following is tracking radar
54. A biostatic radar system shown in figure has following parameters; f = 5 GHz, Gdt = 34 dB, Gdr = 22 dB. To obtain a return power of 8pW the minimum necessary radiated power should be
55. A satellite transmits signals at a frequency of 6 GHz to a user 40000 km away. The free space path loss incurred by the signal is nearly:
56. A fixed radar station transmits 100 kW at 3 GHz. The smallest ocean-going ship has a radar cross-section of 200 m2. The radar antenna gain is 16 dB. If detection requires a minimum of 1 nW/m2 at the radar antenna, the effective range of the radar is nearly
57. A vertical wire of 1 m length carries a current of 1 A at 10 MHz. The total radiating power is nearly
58. What are the celestial bodies revolving around the planets called as?
59. A geostationary satellite located at about 35000 km from earth can cover
60. A low earth orbit satellite can provide large signal strength at an earth station because
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