General exam question G8C07
Subelement G8, SIGNALS AND EMISSIONS· Group G8C
Which of the following narrow-band digital modes can receive signals with very low signal-to-noise ratios?
- A.MSK144
- B.FT8 (correct answer)
- C.AMTOR
- D.MFSK32
WhyFT8 is a narrow-band digital mode that can receive signals with very low signal-to-noise ratios. FT8 is specifically engineered with strong forward error correction and a narrow, tightly defined symbol structure that lets it reliably decode signals well below what the ear or eye could otherwise recognize, giving it very low signal-to-noise ratio performance, answer B. MSK144, AMTOR, and MFSK32 are all real digital modes but none is designed for or known for FT8's particular weak-signal decoding capability, so A, C, and D 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
- G8C02Which digital mode is used as a low-power beacon for assessing HF propagation?
- G8C03What part of a packet radio frame contains the routing and handling information?
- G8C04Which of the following describes Baudot code?
- G8C05In an ARQ mode, what is meant by a NAK response to a transmitted packet?
- G8C06What action results from a failure to exchange information due to excessive transmission attempts when using an ARQ mode?