Ham Amateur Radio Technician Practice Exam

A Yagi antenna is a type of directional antenna that is widely used in amateur radio due to its efficiency and ability to focus radio signals in a specific direction. The forward gain, front-to-back ratio, and SWR (Standing Wave Ratio) bandwidth are all important performance characteristics of a Yagi antenna that can be optimized through various adjustments.

Forward gain refers to the ability of the antenna to radiate power in its designated direction compared to an isotropic radiator. By adjusting elements such as the length and spacing of the driven element and reflectors, you can maximize this gain.

The front-to-back ratio indicates how effectively the antenna can receive or transmit signals from the front compared to the back. This characteristic can also be enhanced by altering the element configuration, such as the spacing and length of the parasitic elements.

SWR bandwidth describes the range of frequencies over which the antenna operates efficiently, particularly at low SWR levels. Adjustments to the antenna’s dimensions can help optimize the bandwidth, making it more versatile for different frequency ranges.

Since all three aspects—forward gain, front-to-back ratio, and SWR bandwidth—can be adjusted for improvement by tweaking the physical characteristics of the antenna, selecting the option indicating that all choices are correct accurately reflects the