Extra exam question E2E10
Subelement E2, OPERATING PROCEDURES· Group E2E
E2E10
Which of these digital modes has the narrowest bandwidth?
- A.MFSK16
- B.170 Hz shift, 45-baud RTTY
- C.FT8 (correct answer)
- D.PACTOR IV
WhyAmong these digital modes, FT8 has the narrowest bandwidth. FT8's tightly packed multitone signal occupies only around 50 Hz of bandwidth, narrower than 170 Hz shift RTTY, MFSK16, or PACTOR IV, all of which spread their energy across a noticeably wider slice of spectrum, answer C. Among the choices given, FT8's bandwidth is the narrowest.
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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