Technician exam question T9B12
Subelement T9, ANTENNAS AND FEED LINES· Group T9B
What is standing wave ratio (SWR)?
- A.A measure of how well a load is matched to a transmission line (correct answer)
- B.The ratio of amplifier power output to input
- C.The transmitter efficiency ratio
- D.An indication of the quality of your station’s ground connection
WhyStanding wave ratio (SWR) is a measure of how well a load is matched to a transmission line. Standing wave ratio is a direct measure of how well a load, typically an antenna system, is matched to the characteristic impedance of the transmission line feeding it, answer A. It isn't a measure of amplifier gain (B) or transmitter efficiency (C), and it doesn't indicate anything about a station's ground connection (D), SWR is purely about the impedance match between line and load.
Published 2026-08-28 · Last updated 2026-08-28 · Question text is verbatim from the 2026-2030 NCVEC Element 2 pool (public domain); the explanation above is original writing, see our methodology.
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