Discussion
Which quantity is unchanged by inserting a matched attenuator ahead of a receiver?
Answer: A
The ratio at the antenna is a property of what arrives there and is unaffected by anything downstream, whereas the attenuator worsens the system noise figure and reduces both signal and noise power at the receiver. That distinction matters because it explains why attenuation before the gain is damaging while attenuation after it is harmless: the ratio delivered to the detector is what counts, not the ratio available at the antenna.
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