The effective noise temperature of an antenna looking toward empty sky is approximately 4 K. The…

The effective noise temperature of an antenna looking toward
empty sky is approximately 4 K. The antenna is connected to a receiver, which
has a noise temperature of about 54 K, with a transmission line of physical
temperature of 300 K. The transmission line has an attenuation coefficient 0.1
dB/m and its length is 10 m.

a. Find the effective noise temperature at the receiver
terminals and calculate the increase in the noise power in dB at the receiver
input due to the use of the lossy cable

b. Repeat part (a) when there is a cloud in the boresight
direction of the antenna which has a

The effective noise temperature of an antenna looking toward
empty sky is approximately 4 K. The antenna is connected to a receiver, which
has a noise temperature of about 54 K, with a transmission line of physical
temperature of 300 K. The transmission line has an attenuation coefficient 0.1
dB/m and its length is 10 m.

a. Find the effective noise temperature at the receiver
terminals and calculate the increase in the noise power in dB at the receiver
input due to the use of the lossy cable

b. Repeat part (a) when there is a cloud in the boresight
direction of the antenna which has a temperature of 250 K and causing a loss of
2 dB at the frequency of operation.

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