Discussion
Which three figures of merit describe a receiver?
Answer: A
The classical trio is sensitivity, how weak a signal can be used; selectivity, how well neighbours are rejected; and fidelity, how faithfully the audio is reproduced - and they pull against one another, since narrowing the bandwidth improves selectivity while harming fidelity. Gain, bandwidth and impedance are circuit parameters. Power and efficiency belong to transmitters. And the last three are modulation parameters. Naming the trade-off explicitly is what distinguishes receiver design from mere amplification.
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