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E4C11:Why does input attenuation reduce receiver overload on the lower frequency HF bands with little or no impact on signal-to-noise ratio?

E4C11E4C

Why does input attenuation reduce receiver overload on the lower frequency HF bands with little or no impact on signal-to-noise ratio?

Direct answer summary (2024-2028 NCVEC pool)

The official correct answer for E4C11 is Atmospheric noise is generally greater than internally generated noise even after attenuation.

The reason is atmospheric noise is generally greater than internally generated noise even after attenuation. Connect the cause in the question to this direct result instead of memorizing the answer letter.

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