Deep Dive: E2B12
The correct answer is A: Specific tone frequencies. What signals SSTV receiving software to begin a new picture line is specific tone frequencies. SSTV uses specific tone frequencies to signal the start of a new line. For amateur radio operators, this is important for SSTV operation. Understanding this helps when operating SSTV.
Why Other Answers Are Wrong
Option B: Incorrect. Elapsed time isn't how new lines are signaled - specific tone frequencies signal new lines. Elapsed time isn't the signal. Option C: Incorrect. Specific tone amplitudes isn't how new lines are signaled - specific tone frequencies signal new lines. Tone amplitudes isn't the signal. Option D: Incorrect. A two-tone signal isn't how new lines are signaled - specific tone frequencies signal new lines. Two-tone isn't the signal.
Exam Tip
SSTV new line signal = specific tone frequencies. Think 'S'STV 'N'ew 'L'ine = 'S'pecific 'F'requencies. SSTV uses specific tone frequencies to signal the start of a new line. Not elapsed time, not tone amplitudes, not two-tone - just specific tone frequencies.
Memory Aid
SSTV new line signal = specific tone frequencies. Think 'S'STV 'N'ew 'L'ine = 'F'requencies. SSTV uses specific tone frequencies to signal the start of a new line. Important for SSTV operation.
Real-World Example
SSTV receiving software: It detects specific tone frequencies that signal the start of a new picture line. When the software detects these frequencies, it knows to begin a new line in the image. This is how SSTV synchronizes lines - specific tone frequencies signal new lines.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E2B
Reference: 2024-2028 Question Pool · E2 - Operating Procedures
Key Concepts
Official Pool Source
Question text and answer key are synchronized with the current NCVEC Extra Class pool and mapped to the E2B topic.