Deep Dive: E4B11
The correct answer is D: All these choices are correct. Which of the following can be measured with a vector network analyzer includes: input impedance, output impedance, and reflection coefficient. All three can be measured with VNAs. For amateur radio operators, this is important for test equipment. Understanding this helps when using network analyzers.
Why Other Answers Are Wrong
Option A: While correct, this is incomplete. Output impedance and reflection coefficient can also be measured. Option B: While correct, this is incomplete. Input impedance and reflection coefficient can also be measured. Option C: While correct, this is incomplete. Input impedance and output impedance can also be measured.
Exam Tip
All three can be measured with VNA: input impedance, output impedance, reflection coefficient. When all listed parameters can be measured with VNAs, 'all of the above' is usually the answer. All are valid VNA measurements.
Memory Aid
All three can be measured with VNA: Input impedance, Output impedance, Reflection coefficient. Think 'A'll 'V'NA measurements. All three are valid VNA measurements. Important for test equipment.
Real-World Example
A vector network analyzer: It can measure input impedance (S11), output impedance (S22), and reflection coefficient (S11, S22). VNAs measure S parameters which provide all this information. This is what can be measured - all these parameters with VNA.
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.