Ham Radio General Class Test 2025 – 400 Free Practice Questions to Pass the Exam

A field strength meter is an instrument used to measure the strength of electromagnetic fields, particularly in the context of radio waves. One of its primary applications is to assess how the radio waves emitted from an antenna propagate through space. When used with an antenna, a field strength meter can help visualize and measure the radiation pattern of the antenna, which represents how the antenna radiates energy in different directions.

The radiation pattern is typically depicted as a graphical representation showing the power levels in various directions relative to the antenna. By taking measurements at different angles and distances from the antenna, one can map out the maximum and minimum radiation fields, thereby determining the shape and efficiency of the radiation pattern.

While the other options mentioned involve aspects of transmission and signal integrity, they do not directly relate to the capabilities of a field strength meter. Radiation resistance is a specific parameter that requires more detailed measurement methods, and phase and amplitude distortion are characteristics of the transmitted signal that typically necessitate different types of analysis equipment, such as oscilloscopes or spectrum analyzers. Thus, the field strength meter is best suited for assessing the radiation pattern of an antenna.