Basic Qualification · B-006 Feedlines and antenna systems · B-006-005-002
What does an SWR reading of less than 1.5:1 mean?
- A An impedance match that is too low
- B A serious impedance mismatch, something may be wrong with the antenna system
- C An antenna gain of 1.5
- D A fairly good impedance match
Correct answer: D — A fairly good impedance match. From the official ISED question bank, verified word for word.
Why
An SWR reading under 1.5:1 means the radio energy flows from your transmitter to the antenna with very little bouncing back, which indicates the antenna system is tuned well to the frequency. The full explanation — and one for every question — is in Pro.
Practise this section
Getting the signal out: antennas, feedlines, SWR, baluns, matching, and why antenna length depends on frequency.