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The input to a receiver with a gain of 31 dB and bandwidth of 5MHz is...

The input to a receiver with a gain of 31 dB and bandwidth of 5MHz is terminated with a matched antenna. The noise out of the receiver is -2dBm.
i. Find the receiver’s noise figure.   
ii. If the effective area of the receiver antenna is doubled; how does this affect the Noise figure of the system?   
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