Extra exam question E8D05
Subelement E8, SIGNALS AND EMISSIONS· Group E8D
What is the most common method of reducing key clicks?
- A.Increase keying waveform rise and fall times (correct answer)
- B.Insert low-pass filters at the transmitter output
- C.Reduce keying waveform rise and fall times
- D.Insert high-pass filters at the transmitter output
WhyThe most common method of reducing key clicks is to increase the keying waveform's rise and fall times. The most common way to reduce key clicks is to increase the keying waveform's rise and fall times, deliberately softening the transitions between key-down and key-up so the signal's spectrum doesn't spread as wide, answer A. Reducing rise and fall times would make key clicks worse, not better, and inserting low-pass or high-pass filters at the transmitter output isn't the standard fix for a problem that originates in the keying waveform itself, before it ever reaches the final output stage.
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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