Discussion
Which measurement determines a receiver's noise figure?
Answer: C
The Y-factor method compares the output with two known noise sources at different temperatures, which yields the noise figure without needing an absolute power calibration. A swept generator measures frequency response. Audio output with no antenna gives residual noise but no reference. And the detector's direct output measures signal strength. Any measurement of a degradation needs two known conditions, which is what the two sources provide.
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