Extra exam question E4C10
Subelement E4, AMATEUR PRACTICES· Group E4C
What is an advantage of having a variety of receiver bandwidths from which to select?
- A.The noise figure of the RF amplifier can be adjusted to match the modulation type, thus increasing receiver sensitivity
- B.Receiver power consumption can be reduced when wider bandwidth is not required
- C.Receive bandwidth can be set to match the modulation bandwidth, maximizing signal-to-noise ratio and minimizing interference (correct answer)
- D.Multiple frequencies can be received simultaneously if desired
WhyHaving a variety of selectable receiver bandwidths lets the receive bandwidth be matched to the modulation bandwidth in use, maximizing signal-to-noise ratio and minimizing interference. Having a selection of receiver bandwidths lets an operator match the receive bandwidth to whatever mode's actual modulation bandwidth is in use, narrow for CW, wider for SSB, wider still for FM, maximizing signal-to-noise ratio while excluding as much adjacent interference as possible, answer C. It isn't primarily about adjusting RF amplifier noise figure, reducing power consumption, or receiving multiple frequencies at once, those aren't what selectable bandwidth is for.
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?