Deep Dive: E4A11
The correct answer is D: All these choices are correct. Which of the following can be measured with an antenna analyzer includes: velocity factor, cable length, and resonant frequency of a tuned circuit. All three can be measured with antenna analyzers. For amateur radio operators, this is important for test equipment. Understanding this helps when using antenna analyzers.
Why Other Answers Are Wrong
Option A: While correct, this is incomplete. Cable length and resonant frequency can also be measured. Option B: While correct, this is incomplete. Velocity factor and resonant frequency can also be measured. Option C: While correct, this is incomplete. Velocity factor and cable length can also be measured.
Exam Tip
All three can be measured with antenna analyzer: velocity factor, cable length, resonant frequency. When all listed parameters can be measured with antenna analyzers, 'all of the above' is usually the answer. All are valid antenna analyzer measurements.
Memory Aid
All three can be measured with antenna analyzer: Velocity factor, Cable length, Resonant frequency. Think 'A'll 'A'ntenna 'A'nalyzer measurements. All three are valid antenna analyzer measurements. Important for test equipment.
Real-World Example
An antenna analyzer: It can measure velocity factor (by measuring electrical length vs physical length), cable length (by measuring delay), and resonant frequency of a tuned circuit (by finding minimum SWR). All three can be measured. This is what can be measured - all these parameters.
Source & Coverage
Question Pool: 2024-2028 Question Pool
Subelement: E4A
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 E4A topic.