Question
What does an SWR reading of 4:1 indicate?
Answer Options
- A) Loss of -4 dB
- B) Good impedance match
- C) Gain of +4 dB
- D) Impedance mismatch
Correct Answer: D
Explanation
The Standing Wave Ratio (SWR) measures the quality of the impedance match between the transmitter/feed line and the antenna (T9B12). A perfect match is 1:1 (T7C04). Any ratio greater than 1:1 indicates that power is being reflected back to the source.
Therefore, an SWR reading of 4:1 indicates a significant impedance mismatch. This mismatch means a large amount of the transmitted power is not reaching the antenna to be radiated, leading to power loss in the feed line (T7C07) and potentially tripping the radio’s protection circuit (T7C05).
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