Which of the following measures a filter’s ability to reject signals in adjacent channels?
The correct answer is C: Shape factor. Which of the following measures a filter's ability to reject signals in adjacent channels is shape factor. Shape factor measures how sharp the filter transition is. For amateur radio operators, this is important for filter evaluation. Understanding this helps when evaluating filters.
Exam Tip
Measure of filter's adjacent channel rejection = shape factor. Think 'S'hape 'F'actor = 'S'harpness 'F'actor (measures transition sharpness). Shape factor measures how sharp the filter transition is. Not passband ripple, not phase response, not noise factor - just shape factor.
Memory Aid
"Measure of filter's adjacent channel rejection = shape factor. Think 'S'hape 'F'actor = 'S'harpness. Shape factor measures how sharp the filter transition is. Important for filter evaluation."
Real-World Application
A filter's ability to reject signals in adjacent channels: It's measured by shape factor. Shape factor is the ratio of bandwidths at different attenuation levels, indicating how sharp the filter transition is. This is the measure - shape factor.
Key Concepts
Why Other Options Are Wrong
Option A (Passband ripple): Incorrect. Passband ripple doesn't measure adjacent channel rejection - shape factor does. Passband ripple isn't the measure.
Option B (Phase response): Incorrect. Phase response doesn't measure adjacent channel rejection - shape factor does. Phase response isn't the measure.
Option D (Noise factor): Incorrect. Noise factor doesn't measure adjacent channel rejection - shape factor does. Noise factor isn't the measure.
题目解析
The correct answer is C: Shape factor. Which of the following measures a filter's ability to reject signals in adjacent channels is shape factor. Shape factor measures how sharp the filter transition is. For amateur radio operators, this is important for filter evaluation. Understanding this helps when evaluating filters.
考试技巧
Measure of filter's adjacent channel rejection = shape factor. Think 'S'hape 'F'actor = 'S'harpness 'F'actor (measures transition sharpness). Shape factor measures how sharp the filter transition is. Not passband ripple, not phase response, not noise factor - just shape factor.
记忆口诀
Measure of filter's adjacent channel rejection = shape factor. Think 'S'hape 'F'actor = 'S'harpness. Shape factor measures how sharp the filter transition is. Important for filter evaluation.
实际应用示例
A filter's ability to reject signals in adjacent channels: It's measured by shape factor. Shape factor is the ratio of bandwidths at different attenuation levels, indicating how sharp the filter transition is. This is the measure - shape factor.
错误选项分析
Option A (Passband ripple): Incorrect. Passband ripple doesn't measure adjacent channel rejection - shape factor does. Passband ripple isn't the measure. Option B (Phase response): Incorrect. Phase response doesn't measure adjacent channel rejection - shape factor does. Phase response isn't the measure. Option D (Noise factor): Incorrect. Noise factor doesn't measure adjacent channel rejection - shape factor does. Noise factor isn't the measure.
知识点
Measures filter's ability, Reject signals, Adjacent channels, Shape factor
Verified Content
Question from official FCC Extra Class question pool. Explanation reviewed by licensed amateur radio operators.