Basic Qualification · B-006 Feedlines and antenna systems · B-006-005-009
What does an SWR meter measure to determine the SWR?
- A Common-mode current
- B Forward and reflected voltage
- C Radiated RF energy
- D Conductor temperature
Correct answer: B — Forward and reflected voltage. From the official ISED question bank, verified word for word.
Why
An SWR meter works by sampling the radio signal travelling toward the antenna and the portion bouncing back, measuring both the forward and reflected voltage to calculate the Standing Wave Ratio. 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.