What reading on an SWR meter indicates a perfect impedance match between the antenna and the feed line?

• A. 2:1
• B. 1:1
• C. 3:1
• D. 4:1

Answer: (B)

A reading of 1:1 on an SWR (Standing Wave Ratio) meter indicates a perfect impedance match between the antenna and the feed line. This means that all the power being transmitted from the transmitter is being radiated by the antenna, with no power being reflected back toward the transmitter.

In practice, an SWR of 1:1 signifies that the impedance of the antenna matches the characteristic impedance of the feed line, which is typically 50 ohms for most amateur radio equipment. A higher SWR reading, such as 2:1, 3:1, or 4:1, indicates increasing levels of impedance mismatch, resulting in some portion of the transmitted power being reflected rather than transmitted. This mismatch can lead to reduced efficiency, potential damage to the transmitter, and a decrease in overall system performance. Thus, achieving a 1:1 SWR is crucial for optimal operation of a ham radio station.