Question
What is standing wave ratio (SWR)?
Answer Options
- A) A measure of how well a load is matched to a transmission line
- 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
Correct Answer: A
Explanation
The Standing Wave Ratio (SWR) is a metric used to describe the efficiency of power transfer between a transmission line (like coax) and the antenna (the load). It is calculated by comparing the amount of power traveling forward to the amount of power reflected back from the antenna.
Therefore, SWR is a measure of how well a load is matched to a transmission line. A low SWR (near 1:1) indicates a good match and highly efficient power transfer (T9B01). A high SWR indicates a poor match, wasted power (T7C07), and potential damage to the transmitter (T7C05).
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