Discussion
A receiver's dial reads \( 1000 \ \mathrm{kHz} \) but the station is actually at \( 1010 \ \mathrm{kHz} \). With a \( 6 \ \mathrm{kHz} \) passband the result is
Answer: C
A ten kilohertz error against a six kilohertz passband puts the carrier outside the flat region:
\[ \begin{aligned} \text{error} &= 10 \ \mathrm{kHz} \\ \text{half-passband} &= 3 \ \mathrm{kHz} \end{aligned} \]
so one sideband is attenuated more than the other and the result is reduced output with distortion rather than silence, since the skirts still pass something. Asymmetric sideband attenuation is the mechanism, and it is why accurate tuning matters more as a filter narrows.
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