What is the purpose of a Bird Antenna Tester / VSWR meter?

What is the purpose of a Bird Antenna Tester / VSWR meter?

• A. To tune the transmitter frequency
• B. To indicate problems with the antenna system, such as resonance issues
• C. To record voice messages
• D. To convert RF to audio

Answer: (B)

Measuring how well the antenna matches the feedline and whether it’s resonant is what this tool is about. A Bird Antenna Tester or VSWR meter uses a directional coupler to measure forward and reflected RF power, giving you the VSWR (or return loss). When the antenna is properly resonant at the operating frequency and the feedline impedance matches (typically 50 ohms), reflections are minimized and the VSWR is near 1:1, meaning most power is radiated efficiently. If the antenna isn’t resonant or there are mismatches somewhere in the antenna system, reflected power increases, the VSWR rises, and you’re alerted to a problem in the antenna, such as resonance issues, damaged elements, or bad connections. This makes the device a diagnostic tool for installation and maintenance, helping you locate and fix problems. It isn’t used to tune the transmitter frequency, record voice messages, or convert RF to audio.

Measuring how well the antenna matches the feedline and whether it’s resonant is what this tool is about. A Bird Antenna Tester or VSWR meter uses a directional coupler to measure forward and reflected RF power, giving you the VSWR (or return loss). When the antenna is properly resonant at the operating frequency and the feedline impedance matches (typically 50 ohms), reflections are minimized and the VSWR is near 1:1, meaning most power is radiated efficiently. If the antenna isn’t resonant or there are mismatches somewhere in the antenna system, reflected power increases, the VSWR rises, and you’re alerted to a problem in the antenna, such as resonance issues, damaged elements, or bad connections. This makes the device a diagnostic tool for installation and maintenance, helping you locate and fix problems. It isn’t used to tune the transmitter frequency, record voice messages, or convert RF to audio.