Extra exam question E9C12
Subelement E9, ANTENNAS AND TRANSMISSION LINES· Group E9C
Which of the following describes an extended double Zepp antenna?
- A.An end-fed full-wave dipole antenna
- B.A center-fed 1.5-wavelength dipole antenna
- C.A center-fed 1.25-wavelength dipole antenna (correct answer)
- D.An end-fed 2-wavelength dipole antenna
WhyAn extended double Zepp antenna is a center-fed 1.25-wavelength dipole antenna. An extended double Zepp is a center-fed dipole antenna that's 1.25 wavelengths long, longer than an ordinary half-wave dipole, a length chosen specifically because it produces extra forward gain over a plain dipole while still being practical to feed at the center, answer C. It isn't end-fed, and it isn't 1.5 or 2 wavelengths long, those don't match the specific 1.25-wavelength design this antenna is named for.
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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