Extra exam question E1B01
Subelement E1, COMMISSION RULES· Group E1B · 47 CFR §97.3
Which of the following constitutes a spurious emission?
- A.An amateur station transmission made without the proper call sign identification
- B.A signal transmitted to prevent its detection by any station other than the intended recipient
- C.Any transmitted signal that unintentionally interferes with another licensed radio station and whose levels exceed 40 dB below the fundamental power level
- D.An emission outside the signal’s necessary bandwidth that can be reduced or eliminated without affecting the information transmitted (correct answer)
WhyA spurious emission is any emission outside a signal's necessary bandwidth that can be reduced or eliminated without removing any of the information being transmitted. §97.3 defines a spurious emission as one falling outside a signal's necessary bandwidth that can be reduced or eliminated without taking away any of the information being sent, things like harmonics and unwanted mixing products, answer D. Missing identification, intentionally undetectable signals, and interference above a specific dB threshold are all separate concepts covered by other rules, none of them is what the term spurious emission actually means.
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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