Deep Dive: E4B09
The correct answer is B: Filter frequency response. Which of the following can be measured by a two-port vector network analyzer is filter frequency response. VNAs can measure frequency response of two-port devices like filters. For amateur radio operators, this is important for test equipment. Understanding this helps when using network analyzers.
Why Other Answers Are Wrong
Option A (Phase noise): Incorrect. Phase noise isn't typically measured with VNA - VNAs measure frequency response. Phase noise isn't measured. Option C (Pulse rise time): Incorrect. Pulse rise time isn't measured with VNA - VNAs measure frequency response. Pulse rise time isn't measured. Option D (Forward power): Incorrect. Forward power isn't measured with VNA - VNAs measure S parameters and frequency response. Forward power isn't measured.
Exam Tip
Two-port VNA can measure = filter frequency response. Think 'V'ector 'N'etwork 'A'nalyzer = 'F'requency 'R'esponse. VNAs can measure frequency response of two-port devices like filters. Not phase noise, not pulse rise time, not forward power - just frequency response.
Memory Aid
Two-port VNA can measure = filter frequency response. Think 'V'ector 'N'etwork 'A'nalyzer = 'F'requency 'R'esponse. VNAs can measure frequency response of two-port devices like filters. Important for test equipment.
Real-World Example
A two-port vector network analyzer: It can measure filter frequency response. The VNA sends signals through the filter and measures the response, showing how the filter responds at different frequencies. This is what can be measured - filter frequency response.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E4B
Reference: 2024-2028 Question Pool · E4 - Amateur Practices
Key Concepts
Verified Content
Question from the official FCC Extra Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the E4B topic.