Which of the following can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna?
The correct answer is D: All these choices are correct. What can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna includes: the physical length of the boom, the number of elements on the boom, and the spacing of each element along the boom. All three can be adjusted to optimize Yagi performance. For amateur radio operators, this explains Yagi design flexibility. Understanding this helps when designing Yagi antennas.
Exam Tip
All three can optimize Yagi: boom length, number of elements, element spacing. When all listed parameters can be adjusted to optimize Yagi performance, 'all of the above' is usually the answer. All affect forward gain, F/B ratio, and SWR bandwidth.
Memory Aid
"All three can optimize Yagi: Boom length, Number of elements, Element spacing. Think 'A'll 'Y'agi 'O'ptimization parameters. All three can be adjusted to optimize forward gain, F/B ratio, or SWR bandwidth. Yagi design flexibility."
Real-World Application
Yagi optimization: (1) Boom length affects element spacing and overall performance, (2) Number of elements affects gain and F/B ratio, (3) Element spacing affects gain, F/B ratio, and SWR bandwidth. All three can be adjusted to optimize Yagi performance - forward gain, front-to-back ratio, or SWR bandwidth. This is Yagi design flexibility.
Key Concepts
Why Other Options Are Wrong
Option A: While correct, this is incomplete. Number of elements and spacing also affect optimization.
Option B: While correct, this is incomplete. Boom length and spacing also affect optimization.
Option C: While correct, this is incomplete. Boom length and number of elements also affect optimization.
题目解析
The correct answer is D: All these choices are correct. What can be adjusted to optimize forward gain, front-to-back ratio, or SWR bandwidth of a Yagi antenna includes: the physical length of the boom, the number of elements on the boom, and the spacing of each element along the boom. All three can be adjusted to optimize Yagi performance. For amateur radio operators, this explains Yagi design flexibility. Understanding this helps when designing Yagi antennas.
考试技巧
All three can optimize Yagi: boom length, number of elements, element spacing. When all listed parameters can be adjusted to optimize Yagi performance, 'all of the above' is usually the answer. All affect forward gain, F/B ratio, and SWR bandwidth.
记忆口诀
All three can optimize Yagi: Boom length, Number of elements, Element spacing. Think 'A'll 'Y'agi 'O'ptimization parameters. All three can be adjusted to optimize forward gain, F/B ratio, or SWR bandwidth. Yagi design flexibility.
实际应用示例
Yagi optimization: (1) Boom length affects element spacing and overall performance, (2) Number of elements affects gain and F/B ratio, (3) Element spacing affects gain, F/B ratio, and SWR bandwidth. All three can be adjusted to optimize Yagi performance - forward gain, front-to-back ratio, or SWR bandwidth. This is Yagi design flexibility.
错误选项分析
Option A: While correct, this is incomplete. Number of elements and spacing also affect optimization. Option B: While correct, this is incomplete. Boom length and spacing also affect optimization. Option C: While correct, this is incomplete. Boom length and number of elements also affect optimization.
知识点
Yagi optimization, Boom length, Number of elements, Element spacing
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.