Extra exam question E4C09
Subelement E4, AMATEUR PRACTICES· Group E4C
Which of the following choices is a good reason for selecting a high IF for a superheterodyne HF or VHF communications receiver?
- A.Fewer components in the receiver
- B.Reduced drift
- C.Easier for front-end circuitry to eliminate image responses (correct answer)
- D.Improved receiver noise figure
WhyA high IF in a superheterodyne HF or VHF receiver makes it easier for front-end circuitry to eliminate image responses. A high intermediate frequency in a superheterodyne receiver pushes the image frequency (the mirror-image frequency that would otherwise mix down to the same IF) far enough away from the desired signal that front-end filtering can more easily reject it before it ever reaches the mixer, answer C. A high IF doesn't reduce component count, doesn't inherently reduce drift, and doesn't by itself improve noise figure, those depend on other design choices.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2024-2028 NCVEC Element 4 pool (public domain); the explanation above is original writing, see our methodology.
Related questions
- E4C01What is an effect of excessive phase noise in an SDR receiver’s master clock oscillator?
- E4C02Which of the following receiver circuits can be effective in eliminating interference from strong out-of- band signals?
- E4C03What is the term for the suppression in an FM receiver of one signal by another stronger signal on the same frequency?
- E4C04What is the noise figure of a receiver?
- E4C05What does a receiver noise floor of -174 dBm represent?