Discussion
Which of the following is not a way of reducing the effect of noise on a link?
Increasing the receiver's audio gain
Cooling the receiver's first stage
Narrowing the receiver bandwidth to the signal
Raising the modulation index within the allocated bandwidth
Answer: A
Increasing the audio gain raises signal and noise together and improves nothing, which is the most common misconception about receiver noise. Cooling reduces thermal noise in the stage that dominates. Narrowing the bandwidth admits less noise power. And a higher index buys demodulation gain where the bandwidth allows it. Each genuine remedy acts on the noise itself or on the demodulation, and any proposal that scales signal and noise equally can be dismissed without calculation.
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