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E4C11

Why can an attenuator be used to reduce receiver overload on the lower frequency HF bands with little or no impact on signal-to-noise ratio?

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ASignals are attenuated separately from the noise
BThe attenuator has a noise filter to suppress interference
CThe attenuator has a low-pass filter to increase the strength of lower frequency signals
DAtmospheric noise is generally greater than internally generated noise even after attenuation