Ham Radio General Class Practice Test

Which feature is NOT typically associated with a log periodic antenna?

1. Harmonic suppression

2. Multiple frequency operation

3. Constant gain over frequency

4. Logarithmic element scaling

The correct answer is: Constant gain over frequency

A log periodic antenna is designed to operate efficiently over a wide range of frequencies, featuring elements that are progressively scaled in length according to a logarithmic pattern. This results in the ability to handle multiple frequencies with good performance, making it a favored choice for applications requiring broadband capabilities. Harmonic suppression refers to the antenna's ability to minimize unwanted harmonics of the transmission frequency. A log periodic design does not inherently specialize in suppressing harmonics, which can be beneficial in various operational contexts. While a log periodic antenna can provide relatively consistent gain across different frequencies, it does not maintain a constant gain across its entire frequency range. Instead, the gain approximates relatively constant values, falling within a certain range. Logarithmic element scaling is a defining characteristic of these antennas, enabling them to achieve their operational efficiency over multiple frequencies.