17. A feeder uplink frequency (Ku band) is: A. 14MHaz B. 140 MHz C. 1400 MHz D.
ID: 2249213 • Letter: 1
Question
17. A feeder uplink frequency (Ku band) is: A. 14MHaz B. 140 MHz C. 1400 MHz D. 14000MHz E. None of the above is true. I8. In geo-synchronous orbits: A. The orbital period is the half of Earth's orbital period B. The orbital period is the same as that of Earth's orbital period C. The orbital period is twice of Earth's orbital period D. The orbital period is three times of Earth's orbital period E. None of the above is true. 19. In geo-synchronous orbits: A. Only the weight of the satellite has an impact on the power needed to operate the satellite. B. The satellite is placed very close to Earth and, therefore, low-power satellites are needed to communicate with the compact ground antennas. C. The distance from Earth has no impact on the power needed to operate a satellite. D. The satellie needs to have sufficiently high power to communicate with the compact ground antennas. E. None of the above is true. 20. Non geo-stationary orbiting satellites A. Have orbits farther from Earth as compared to geo-synchronous satellites B. Only a single satellite is needed in each orbit for effective communication. C. Have orbits closer to Earth as compared to geo-synchronous satellites D. Have orbits that can be closer to or E. None of the above is true. farther from Earth as compared to geo-synchronous satellites, depending on the needExplanation / Answer
17(a)
Ku band– uplink 14 GHz; downlink 10.9-12.75 GHz Ku band is used typically for consumer direct-to-home access, distance learning applications, retail and enterprise connectivity. The antenna sizes, ranging from 0.9m -1.2m (~3ft), are much smaller than C band because the higher frequency means that higher gain can be achieved with small antenna sizes than C-band. Networks in this band are more susceptible to rain fade, especially in tropical areas.
18(b)
An object in such an orbit has an orbital period equal to the Earth's rotational period (one sidereal day) and thus appears motionless, at a fixed position in the sky, to ground observers. Communications satellitesand weather satellites are often placed in geostationary orbits, so that the satellite antennas (located on Earth) that communicate with them do not have to rotate to track them, but can be pointed permanently at the position in the sky where the satellites are located. Using this characteristic, ocean color satellites with visible and near-infrared light sensors (e.g. the Geostationary Ocean Color Imager (GOCI)) can also be operated in geostationary orbit in order to monitor sensitive changes of ocean environments.
19(d)
As the satellite needs to communicate with the antennas present in the Earth's surface.
20(d)
As they are not orbiting around earth so they may be near our far depending on this their needs
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