General exam question G8C11
Subelement G8, SIGNALS AND EMISSIONS· Group G8C
How are the two separate frequencies of a Frequency Shift Keyed (FSK) signal identified?
- A.Dot and dash
- B.On and off
- C.High and low
- D.Mark and space (correct answer)
WhyThe two separate frequencies of a Frequency Shift Keyed signal are identified as mark and space. An FSK signal's two distinct tones are conventionally called mark and space, terms carried over from historical teleprinter signaling, answer D. "Dot and dash" describes CW/Morse elements, "on and off" describes simple keyed carrier presence, and "high and low" isn't the standard terminology for FSK's two states, so A, B, and C 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.
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