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12.17. Explain why the LNA of a receiving system is placed at the antenna end of the feeder cable. 12.18. An antenna having a noise temperature of 35 K is connected through a feeder having 0.5-dB loss to an LNA. The LNA has a noise temperature of 90 K. Calculate the system noise temperature referred to (a) the feeder input and (b) the LNA input. 12.19. Explain what is meant by carrier-to-noise ratio. At the input to a receiver the received carrier power is 400 pW and the system noise temperature is 450 K. Calculate the carrier-to-noise density ratio in dBHz. Given that the bandwidth is 36 MHz, calculate the carrier-to-noise ratio in decibels. 12.20. Explain what is meant by the G/T ratio of a satellite receiving system. A satellite receiving system employs a 5-m parabolic antenna operating at 12 GHz. The antenna noise temperature is 100 K, and the receiver front-end noise temperature is 120 K. Calculate [G/T]. 12.21. In a satellite link the propagation loss is 200 dB. Margins and other losses account for another 3 dB. The receiver [G/T] is 11 dB, and the [EIRP] is 45 dBW. Calculate the received [C/N] for a system bandwidth of 36 MHz. 12.22. A carrier-to-noise density ratio of 90 dBHz is required at a receiver having a [G/T] ratio of 12 dB. Given that total losses in the link amount to 196 dB, calculate the [EIRP] required. 12.23. Explain what is meant by saturation flux density. The power received by a 1.8-m parabolic antenna at 14 GHz is 250 pW. Calculate the power flux density (a) in W/m2 and (b) in dBW/m2 at the antenna. 12.24. An earth station radiates an [EIRP] of 54 dBW at a frequency of 6 GHz. Assuming that total losses amount to 200 dB, calculate the power flux density at the satellite receiver. 12.25. A satellite transponder requires a saturation flux density of 110 dBW/m2, operating at a frequency of 14 GHz. Calculate the earth station [EIRP] required if total losses amount to 200 dB. 12.26. Explain what is meant by input BO. An earth station is required to operate at an [EIRP] of 44 dBW in order to produce saturation of the satellite transponder. If the transponder has to be operated in a 10 dB input BO mode, calculate the new value of [EIRP] required. 12.27. Determine the carrier-to-noise density ratio at the satellite input for an uplink, which has the following parameters: operating frequency 6 GHz, saturation flux density 95 dBW/m2, input BO 11 dB, satellite [G/T] 7 dBK 1, [RFL] 0.5 dB. (Tabulate the link budget values as shown in the text).
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12.28. For an uplink the required [C/N] ratio is 20 dB. The operating frequency is 30 GHz, and the bandwidth is 72 MHz. The satellite [G/T] is 14.5 dBK 1. Assuming operation with 11 dB input BO, calculate the saturation flux density. [RFL] are 1 dB. 12.29. For the uplink in Prob. 12.28, the total losses amount to 218 dB. Calculate the earth station [EIRP] required. 12.30. An earth station radiates an [EIRP] of 54 dBW at 14 GHz from a 10-m parabolic antenna. The transmit feeder losses between the HPA and the antenna are 2.5 dB. Calculate the output of the HPA. 12.31. The following parameters apply to a satellite downlink: saturation [EIRP] 22.5 dBW, free-space loss 195 dB, other losses and margins 1.5 dB, earth station [G/T] 37.5 dB/K. Calculate the [C/N0] at the earth station. Assuming an output BO of 6 dB is applied, what is the new value of [C/N0] 12.32. The output from a satellite TWTA is 10 W. This is fed to a 1.2-m parabolic antenna operating at 12 GHz, the feeder loss being 2 dB. Calculate the [EIRP]. 12.33. The [C/N] values for a satellite circuit are uplink 25 dB, downlink 15 dB. Calculate the overall [C/N] value. 12.34. The required [C/N] value at the ground station receiver is 22 dB and the downlink [C/N] is 24 dB. What is the minimum value of [C/N] that the uplink can have in order that the overall value can be achieved 12.35. A satellite circuit has the following parameters:
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Uplink, decilogs [EIRP] [G/T] [FSL] [RFL] [AA] [AML] 54 0 200 2 0.5 0.5 Downlink, decilogs 34 17 198 2 0.5 0.5
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