Extra exam question E2B12
Subelement E2, OPERATING PROCEDURES· Group E2B
What signals SSTV receiving software to begin a new picture line?
- A.Specific tone frequencies (correct answer)
- B.Elapsed time
- C.Specific tone amplitudes
- D.A two-tone signal
WhySSTV receiving software recognizes the start of a new picture line from specific tone frequencies. SSTV receiving software recognizes the start of each new picture line by detecting specific horizontal sync tone frequencies embedded in the signal, distinct from the tones used to encode brightness, answer A. It isn't triggered by elapsed time, tone amplitude, or a generic two-tone signal, the line-timing information is carried specifically in the tone's frequency.
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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