General exam question G4B13
Subelement G4, AMATEUR RADIO PRACTICES· Group G4B
G4B13
Which of the following can be measured with an antenna analyzer?
- A.Front-to-back ratio of an antenna
- B.Power output from a transmitter
- C.Impedance of coaxial cable (correct answer)
- D.Gain of a directional antenna
WhyAn antenna analyzer can measure the impedance of coaxial cable. An antenna analyzer measures impedance versus frequency at its test port, which is exactly the measurement needed to characterize the impedance of a length of coaxial cable, answer C. It can't determine an antenna's front-to-back ratio or gain, those require a far-field pattern measurement, and it isn't a power meter, so it can't read a transmitter's power output either.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2023-2027 NCVEC Element 3 pool (public domain); the explanation above is original writing, see our methodology.
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