Which of the following is a characteristic of using a gamma match with a Yagi antenna?
The correct answer is A: It does not require the driven element to be insulated from the boom. A characteristic of using a gamma match with a Yagi antenna is that it does not require the driven element to be insulated from the boom. Gamma matches allow the driven element to be directly connected to the boom. For amateur radio operators, this simplifies construction. Understanding this helps when building Yagi antennas.
Exam Tip
Gamma match characteristic = does not require driven element insulated from boom. Think 'G'amma 'M'atch = 'G'rounded 'M'atching (element can be grounded). Gamma matches allow driven element to be directly connected to boom. Not no inductors/capacitors, not multiband-specific - just no insulation required.
Memory Aid
"Gamma match characteristic = does not require driven element insulated from boom. Think 'G'amma 'M'atch = 'G'rounded matching. Gamma matches allow driven element to be directly connected to boom. Simplifies construction."
Real-World Application
A Yagi antenna with gamma match: The driven element can be directly connected to the boom (not insulated), and the gamma match provides impedance matching. This simplifies construction - no need to insulate the driven element from the boom. This is a key advantage of gamma matches - they don't require insulation.
Key Concepts
Why Other Options Are Wrong
Option B: Incorrect. Gamma match may require capacitors or inductors for tuning - it doesn't eliminate the need for them. No inductors/capacitors isn't correct.
Option C: Incorrect. Gamma match isn't specifically useful for multiband antennas - it's a matching method, not multiband-specific. Multiband isn't the characteristic.
Option D: Incorrect. Since B and C are not correct, 'all of the above' cannot be correct. Only the insulation characteristic is correct.
题目解析
The correct answer is A: It does not require the driven element to be insulated from the boom. A characteristic of using a gamma match with a Yagi antenna is that it does not require the driven element to be insulated from the boom. Gamma matches allow the driven element to be directly connected to the boom. For amateur radio operators, this simplifies construction. Understanding this helps when building Yagi antennas.
考试技巧
Gamma match characteristic = does not require driven element insulated from boom. Think 'G'amma 'M'atch = 'G'rounded 'M'atching (element can be grounded). Gamma matches allow driven element to be directly connected to boom. Not no inductors/capacitors, not multiband-specific - just no insulation required.
记忆口诀
Gamma match characteristic = does not require driven element insulated from boom. Think 'G'amma 'M'atch = 'G'rounded matching. Gamma matches allow driven element to be directly connected to boom. Simplifies construction.
实际应用示例
A Yagi antenna with gamma match: The driven element can be directly connected to the boom (not insulated), and the gamma match provides impedance matching. This simplifies construction - no need to insulate the driven element from the boom. This is a key advantage of gamma matches - they don't require insulation.
错误选项分析
Option B: Incorrect. Gamma match may require capacitors or inductors for tuning - it doesn't eliminate the need for them. No inductors/capacitors isn't correct. Option C: Incorrect. Gamma match isn't specifically useful for multiband antennas - it's a matching method, not multiband-specific. Multiband isn't the characteristic. Option D: Incorrect. Since B and C are not correct, 'all of the above' cannot be correct. Only the insulation characteristic is correct.
知识点
Gamma match, Yagi antenna, Driven element, Not insulated from boom
Verified Content
Question from official FCC General Class question pool. Explanation reviewed by licensed amateur radio operators.