Video distribution with a Ku-band satellite The parameters in Table 4.8a define the video…

Video distribution with a Ku-band satellite The parameters in Table 4.8a define the video distribution system. Make the following changes. Uplink earth station diameter 7.0 m with aperture efficiency 63%. Receiving earth station diameter 3.0 m with 60% aperture efficiency. Earth station HPA output power 100W. Transponder bandwidth 100 MHz, transponder saturated output power 100W. The uplink and downlink earth stations are at a distance of 38 000 km from the satellite. Give all final answers to the nearest 0.1 dB. a. Calculate the gain of the uplink earth station antenna at a frequency of 14.0

»Video distribution with a Ku-band satellite The parameters in Table 4.8a define the video distribution system. Make the following changes. Uplink earth station diameter 7.0 m with aperture efficiency 63%. Receiving earth station diameter 3.0 m with 60% aperture efficiency. Earth station HPA output power 100W. Transponder bandwidth 100 MHz, transponder saturated output power 100W. The uplink and downlink earth stations are at a distance of 38 000 km from the satellite. Give all final answers to the nearest 0.1 dB. a. Calculate the gain of the uplink earth station antenna at a frequency of 14.0 GHz, and the gain of the downlink earth station antenna at a frequency of 11.0 GHz. Calculate path loss for the uplink and downlink. b. The signal transmitted by the uplink earth station has a bandwidth of 50 MHz and its power level at the input to the transponder is set such that the output from the transponder is half of its operating output power. The transponder is operated with 3.0 dB backoff. Find the output power of the transponder for this signal. c. Set out the uplink and downlink power and noise budgets similar to Tables 4.8c and 4.8d and find the uplink CNR and downlink CNR in clear air conditions. The receiver noise bandwidth is 50 MHz. Then calculate the overall CNR for the receiving earth station. d. Rain attenuation of 5 dB affects the uplink. What is the overall (CNR)o at the receiving earth station, assuming linear operation of the transponder? e. Rain attenuation of 3 dB affects the downlink. What is the overall (CNR)o at the receiving earth station, assuming linear operation of the transponder? f. What is the downlink rain margin for a threshold (minimum required) (CNR)o of 8.0 dB?

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