Deep Dive: G9C10
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.
Why Other Answers 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.
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 Example
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.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G9C
Reference: 2023-2027 Question Pool · G9 - Antennas and Feed Lines
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G9C topic.