Discussion
Which change would improve a receiver's sensitivity most effectively?
Answer: D
Sensitivity is set by the noise added before the gain, so improving the first stage's noise figure is the only change that helps materially. Additional audio gain amplifies noise and signal alike. A narrower audio filter helps a little by reducing the noise bandwidth, at the cost of fidelity. And the loudspeaker affects loudness rather than sensitivity. The cascade formula's weighting of the first stage is the reason low-noise preamplifiers are placed at the antenna.
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