Extra exam question E2B11
Subelement E2, OPERATING PROCEDURES· Group E2B
What is the function of the vertical interval signaling (VIS) code sent as part of an SSTV transmission?
- A.To lock the color burst oscillator in color SSTV images
- B.To identify the SSTV mode being used (correct answer)
- C.To provide vertical synchronization
- D.To identify the call sign of the station transmitting
WhyThe vertical interval signaling code sent as part of an SSTV transmission identifies which SSTV mode is being used. The vertical interval signaling (VIS) code sent at the start of an SSTV transmission tells the receiving software which specific SSTV mode (image format, resolution, and timing) is being used, so the decoder can interpret the rest of the transmission correctly, answer B. It doesn't lock a color burst oscillator, provide vertical sync on its own, or carry the transmitting station's call sign, those are separate functions.
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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