General exam question G8B09
Subelement G8, SIGNALS AND EMISSIONS· Group G8B
Why is it good to match receiver bandwidth to the bandwidth of the operating mode?
- A.It is required by FCC rules
- B.It minimizes power consumption in the receiver
- C.It improves impedance matching of the antenna
- D.It results in the best signal-to-noise ratio (correct answer)
WhyMatching receiver bandwidth to the bandwidth of the operating mode results in the best signal-to-noise ratio. A receiver's noise power scales with how much bandwidth it lets through, so matching the receiver's bandwidth as closely as possible to the actual signal's bandwidth admits only the noise unavoidably mixed in with the signal, which yields the best achievable signal-to-noise ratio, answer D. This isn't an FCC-mandated requirement, it doesn't meaningfully reduce the receiver's power consumption, and it has nothing to do with antenna impedance matching, so A, B, and C are wrong.
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.
Related questions
- G8B01Which mixer input is varied or tuned to convert signals of different frequencies to an intermediate frequency (IF)?
- G8B02What is the term for interference from a signal at twice the IF frequency from the desired signal?
- G8B03What is another term for the mixing of two RF signals?
- G8B04What is the stage in a VHF FM transmitter that generates a harmonic of a lower frequency signal to reach the desired operating frequency?
- G8B05Which intermodulation products are closest to the original signal frequencies?