Extra exam question E9D03
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9D
What is the most efficient location for a loading coil on an electrically short whip?
- A.Near the center of the vertical radiator (correct answer)
- B.As low as possible on the vertical radiator
- C.At a voltage maximum
- D.At a voltage null
WhyThe most efficient location for a loading coil on an electrically short whip is near the center of the vertical radiator. The most efficient place for a loading coil on an electrically short whip is near the center of the vertical radiator, a practical compromise that captures most of the efficiency benefit of top loading while remaining mechanically simpler than mounting the coil right at the very top, answer A. Placing it as low as possible on the radiator is actually one of the least efficient locations, and "at a voltage maximum" and "at a voltage null" don't correctly describe where the coil should go for best efficiency on a short vertical.
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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