Extra exam question E4A08
Subelement E4, AMATEUR PRACTICES· Group E4A
Which of the following is used to measure SWR?
- A.Directional wattmeter
- B.Vector network analyzer
- C.Antenna analyzer
- D.All these choices are correct (correct answer)
WhyA directional wattmeter, a vector network analyzer, and an antenna analyzer can all be used to measure SWR. SWR can be measured with a directional wattmeter (comparing forward and reflected power), a vector network analyzer (measuring the full complex reflection coefficient), or a dedicated antenna analyzer, each arriving at an SWR figure through a different measurement approach, answer D. Since all three genuinely can be used to measure SWR, no single one of them alone is the complete answer.
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.
Related questions
- E4A01Which of the following limits the highest frequency signal that can be accurately displayed on a digital oscilloscope?
- E4A02Which of the following parameters does a spectrum analyzer display on the vertical and horizontal axes?
- E4A03Which of the following test instruments is used to display spurious signals and/or intermodulation distortion products generated by an SSB transmitter?
- E4A04How is compensation of an oscilloscope probe performed?
- E4A05What is the purpose of using a prescaler with a frequency counter?