Deep Dive: G4B12
The correct answer is B: Received power that interferes with SWR readings. The effect that strong signals from nearby transmitters can have on an antenna analyzer is received power that interferes with SWR readings. Strong RF signals can interfere with the analyzer's measurements, giving false readings. For amateur radio operators, this is a problem when using analyzers near active transmitters. Understanding this helps when using antenna analyzers.
Why Other Answers Are Wrong
Option A: Incorrect. Desensitization and intermodulation aren't the primary effects - the main issue is received power interfering with measurements. Desensitization is a different phenomenon. Option C: Incorrect. Harmonic generation isn't the issue - the analyzer doesn't generate harmonics from received signals. Harmonics aren't the problem. Option D: Incorrect. Since A and C are not the primary effects, 'all of the above' cannot be correct. Only received power interference is the main effect.
Exam Tip
Strong signals effect on analyzer = received power interferes with SWR readings. Think 'S'trong 'S'ignals = 'S'poils 'S'WR readings. Strong RF signals can interfere with analyzer's measurements, giving false readings. Not desensitization, not harmonics - just received power interference.
Memory Aid
Strong signals effect on analyzer = received power interferes with SWR readings. Think 'S'trong 'S'ignals = 'S'poils 'S'WR readings. Strong RF signals can interfere with analyzer's measurements. Use analyzer when nearby transmitters are off.
Real-World Example
You use an antenna analyzer near an active transmitter. Strong RF signals from the transmitter are received by the analyzer, interfering with its test signal and measurements. This can give false SWR readings. You should use the analyzer when nearby transmitters are off to get accurate readings.
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.