Extra exam question E2E04
Subelement E2, OPERATING PROCEDURES· Group E2E
Which of the following is characteristic of the FST4 mode?
- A.Four-tone Gaussian frequency shift keying
- B.Variable transmit/receive periods
- C.Seven different tone spacings
- D.All these choices are correct (correct answer)
WhyFST4 combines four-tone Gaussian frequency shift keying, variable transmit and receive periods, and a choice of seven tone spacings. FST4 combines several characteristics at once: four-tone Gaussian frequency shift keying, transmit/receive periods that can be varied to trade speed for sensitivity, and a choice of seven different tone spacings to optimize for different conditions, answer D. Since each of those three is a genuine part of how FST4 works, no single one by itself is the complete description.
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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