General exam question G7C04
Subelement G7, PRACTICAL CIRCUITS· Group G7C
How is a product detector used?
- A.Used in test gear to detect spurious mixing products
- B.Used in a transmitter to perform frequency multiplication
- C.Used in an FM receiver to filter out unwanted sidebands
- D.Used in a single sideband receiver to extract the modulated signal (correct answer)
WhyA product detector is used in a single sideband receiver to extract the modulated signal. A product detector mixes the incoming SSB signal with a locally generated carrier to recover the original audio, which is exactly the demodulation step an SSB receiver needs since the carrier was suppressed at the transmitter, answer D. It isn't test gear for spotting spurious mixing products, isn't used for transmitter frequency multiplication, and isn't the sideband filter used in an FM receiver, so A, B, and C describe unrelated functions.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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