8.6 A communications satellite is in orbit 35 800 km above an earth station. The down path from satellite to earth station operates at 4 GHz. At the earth station the receiver has an effective input noise temperature of 60 K and a bandwidth of 30 MHz, the parabolic dish aerial has a gain of 60 dBi, and the aerial noise temperature is 40 K. If the e.r.p. of the satellite is 30 dBW, calculate (a) the carrier-to-noise ratio of the receiver, and (b) the G/T ratio.

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The answer should be 28.27 dB, 40 dB K^-1
8.6 A communications satellite is in orbit 35 800 km above
an earth station. The down path from satellite to earth station
operates at 4 GHz. At the earth station the receiver has an
effective input noise temperature of 60 K and a bandwidth
of 30 MHz, the parabolic dish aerial has a gain of 60 dBi,
and the aerial noise temperature is 40 K. If the e.r.p. of the
satellite is 30 dBW, calculate (a) the carrier-to-noise ratio
of the receiver, and (b) the G/T ratio.
Transcribed Image Text:8.6 A communications satellite is in orbit 35 800 km above an earth station. The down path from satellite to earth station operates at 4 GHz. At the earth station the receiver has an effective input noise temperature of 60 K and a bandwidth of 30 MHz, the parabolic dish aerial has a gain of 60 dBi, and the aerial noise temperature is 40 K. If the e.r.p. of the satellite is 30 dBW, calculate (a) the carrier-to-noise ratio of the receiver, and (b) the G/T ratio.
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