Satellite Communication Numerical Problem 6

Gwalior earth station has a Antenna of diameter of 30 m, and an overall efficiency of 69%. It is used to receive a signal of 4150 MHz. At this frequency, the system noise temperature is 79 K when the antenna points at the satellite at an If heavy rain causes the sky temperature to increase so that the system noise temperature increases to 88˚ K what is the change in G/T value in dB /K ? A) 0.46  B) 4.6 C) 46 D) 0.046