Extra exam question E7B07
Subelement E7, PRACTICAL CIRCUITS· Group E7B
Which of the following is the likely result of using a Class C amplifier to amplify a single-sideband phone signal?
- A.Reduced intermodulation products
- B.Increased overall intelligibility
- C.Reduced third-order intermodulation
- D.Signal distortion and excessive bandwidth (correct answer)
WhyUsing a Class C amplifier to amplify a single-sideband phone signal is likely to cause signal distortion and excessive bandwidth. Running a single-sideband phone signal through a Class C amplifier, which is designed for constant-envelope signals like CW or FM, badly distorts the varying-amplitude SSB envelope and generates excessive bandwidth from that distortion, answer D. It doesn't reduce intermodulation products or improve intelligibility, Class C amplification of a signal with a changing amplitude envelope is a mismatch that makes things worse, not better.
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.
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