A receiver has poor IF selectivity. It will therefore also have poor

Solution (By Examveda Team)

IF Selectivity: Intermediate Frequency (IF) selectivity refers to the ability of a receiver's intermediate frequency amplifier to select the desired signal and reject adjacent unwanted signals. A receiver's IF stage is crucial for filtering out interfering signals that are close in frequency to the desired signal after it has been downconverted from the Radio Frequency (RF).

Poor IF Selectivity: If the IF selectivity is poor, it means the IF amplifier is not effectively filtering out adjacent channel signals. This allows unwanted signals to pass through, leading to various reception problems.

Correct Answer: A. Blocking
Blocking occurs when a strong, out-of-band signal overwhelms the receiver's IF amplifier, affecting the amplification and demodulation of the desired signal. Poor IF selectivity directly contributes to blocking because the filter isn't rejecting the strong, interfering signal sufficiently. The strong signal essentially "blocks" the desired signal from being properly processed.

Why other options are less likely:
B. Double-spotting: Double-spotting is a phenomenon where a single strong signal appears at two different points on the frequency scale. This is typically caused by image response or other frequency-related issues, but not directly by poor IF selectivity alone.

C. Diversion reception: Diversion reception refers to the reception of an unwanted signal that is outside the normal tuning range. This may be due to insufficient RF filtering or other issues, but not specifically poor IF selectivity.

D. Sensitivity: Sensitivity refers to the minimum signal strength a receiver needs to detect. While poor IF selectivity can indirectly affect sensitivity by introducing interference which could mask weak signals, it's not its primary effect. Poor IF selectivity's main impact is on the receiver's ability to reject unwanted signals close to the desired signal, leading to problems like blocking.