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← ScienceWhich risk escalates within a tuned radio frequency (TRF) receiver when component aging shifts resonant frequency?
A)Amplitude modulation distortion increases rapidly
B)Image frequency rejection drastically declines✓
C)Automatic gain control wildly oscillates
D)Local oscillator signal phase noise amplified
💡 Explanation
Decreased image frequency rejection happens because detuning weakens the selectivity via decreased impedance to unwanted signals; therefore, closely-spaced spurious emissions interfere, because signal discrimination relies heavily on selective filtering to reject undesired frequencies rather than AGC limitations.
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