Which of the following is NOT a function of the receiver?

• A. Amplification
• B. RF to video conversion
• C. Demodulation
• D. Dynamic aperture

Answer: (D)

The receiver’s job is to process the incoming RF signal so the original content can be recovered. Amplification boosts a weak signal so it can be properly processed without excessive noise. RF to video conversion refers to downconverting the high-frequency carrier to a lower frequency or baseband where the subsequent stages can work, effectively preparing the signal for detection. Demodulation then extracts the actual video (or baseband) information from the carrier, delivering the usable output.

Dynamic aperture, on the other hand, isn’t a processing step the receiver performs. It relates to the imaging or sensing system’s ability to collect light or energy, or to how the system handles varying signal levels in its optics or detector, rather than to the signal processing chain inside the receiver. So it does not belong in the list of receiver functions.