Deep Dive: G7C04
The correct answer is D: Used in a single sideband receiver to extract the modulated signal. How a product detector is used is in a single sideband receiver to extract the modulated signal. Product detectors mix the SSB signal with a local oscillator to recover the audio. For amateur radio operators, this is how SSB receivers work. Understanding this helps when designing SSB receivers.
Why Other Answers Are Wrong
Option A: Incorrect. Product detectors aren't used in test gear to detect spurious mixing products - that's done by spectrum analyzers, not product detectors. Spurious detection isn't the use. Option B: Incorrect. Product detectors aren't used in transmitters for frequency multiplication - that's done by multipliers, not product detectors. Frequency multiplication isn't the use. Option C: Incorrect. Product detectors aren't used in FM receivers to filter sidebands - FM receivers use discriminators, not product detectors. FM demodulation is different.
Exam Tip
Product detector use = in SSB receiver to extract modulated signal. Think 'P'roduct 'D'etector = 'P'roduces 'D'emodulated audio in 'S'SB receiver. Product detectors mix SSB signal with local oscillator to recover audio. Not spurious detection, not frequency multiplication, not FM filtering - just SSB demodulation.
Memory Aid
Product detector use = in SSB receiver to extract modulated signal. Think 'P'roduct 'D'etector = 'P'roduces 'D'emodulated audio. Product detectors mix SSB signal with local oscillator to recover audio. Essential for SSB reception.
Real-World Example
An SSB receiver: The product detector mixes the incoming SSB signal with a local oscillator (BFO - Beat Frequency Oscillator). This mixing process extracts the audio from the SSB signal. Product detectors are essential for SSB reception - they're how SSB receivers recover the audio. This is the primary use of product detectors.
Source & Coverage
Question Pool: 2023-2027 Question Pool
Subelement: G7C
Reference: 2023-2027 Question Pool · G7 - Practical Circuits
Key Concepts
Verified Content
Question from the official FCC General Class pool. Explanation reviewed by licensed amateur radio operators and mapped to the G7C topic.