Extra exam question E9H08
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9H
What is the function of a sense antenna?
- A.It modifies the pattern of a DF antenna to provide a null in only one direction (correct answer)
- B.It increases the sensitivity of a DF antenna array
- C.It allows DF antennas to receive signals at different vertical angles
- D.It provides diversity reception that cancels multipath signals
WhyA sense antenna modifies a direction-finding antenna's pattern to provide a null in only one direction. A sense antenna modifies a direction-finding antenna's inherently bidirectional pattern (like a loop's) so it has a null in only one direction instead of two, resolving the 180-degree ambiguity a loop alone can't distinguish on its own, answer A. It doesn't increase array sensitivity, doesn't let a DF antenna receive at different vertical angles, and doesn't provide multipath-canceling diversity reception, those aren't what a sense antenna is added to accomplish.
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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