What practice helps prevent cross-talk when lines are shared?

• A. Speak loudly enough to be heard over others.
• B. Ignore line discipline during busy periods.
• C. Share lines among teams to save equipment.
• D. Maintain proper line discipline and exclusive use of each line.

Answer: (D)

The main idea here is line discipline and ensuring each line is used by only one group. Cross-talk happens when transmissions overlap on a shared line or when multiple parties try to talk at once, causing voices to interfere with each other and distort the message. By maintaining proper line discipline—speaking only when the line is clear, waiting for a turn, using call signs, and ending each transmission clearly with “over” or similar signals—you keep conversations orderly and reduce overlap. Coupled with exclusive use of each line, where a single team or function has its own dedicated wire or circuit, there’s no competing transmission on the same path, so signals don’t bleed into other conversations. In contrast, shouting to be heard, ignoring discipline during busy times, or sharing lines among teams all promote interference rather than prevent it.