Deep Dive: G4B13
The correct answer is C: Impedance of coaxial cable. What can be measured with an antenna analyzer is impedance of coaxial cable. Antenna analyzers measure impedance, which can be used for antennas, feed lines, or other components. For amateur radio operators, this is a primary function of antenna analyzers. Understanding this helps when using analyzers.
Why Other Answers Are Wrong
Option A: Incorrect. Antenna analyzers don't measure front-to-back ratio - that requires measuring signal strength from different directions. Front-to-back ratio needs field strength measurements. Option B: Incorrect. Antenna analyzers don't measure transmitter power output - that requires power meters. Power measurement is different from impedance. Option D: Incorrect. Antenna analyzers don't measure antenna gain - that requires field strength measurements and comparisons. Gain measurement is different.
Exam Tip
Antenna analyzer measures = impedance of coaxial cable. Think 'A'ntenna 'A'nalyzer = 'A'nalyzes 'A'impedance. Measures impedance, which can be used for antennas, feed lines, or other components. Not front-to-back ratio, not power output, not gain - just impedance.
Memory Aid
Antenna analyzer measures = impedance of coaxial cable. Think 'A'ntenna 'A'nalyzer = 'A'nalyzes 'A'impedance. Measures impedance of antennas, feed lines, or other components. Primary function of antenna analyzers.
Real-World Example
You want to check the impedance of a coaxial cable. You connect an antenna analyzer to the cable. The analyzer measures the impedance (e.g., 50 ohms, 75 ohms, or other values). Antenna analyzers are excellent for measuring impedance of cables, antennas, and other components.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G4B
Reference: 2023-2027 Question Pool · G4 - Amateur Radio Practices
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G4B topic.