What is meant by the term “flat-topping,” when referring to an amplitude-modulated phone signal?
Signal distortion caused by insufficient collector current
The transmitter’s automatic level control (ALC) is properly adjusted
Signal distortion caused by excessive drive or speech levels✓Correct answer
The transmitter’s carrier is properly suppressed
Explanation
Flat-topping is what a modulated RF envelope looks like when drive or audio level pushes a stage into saturation and the envelope peaks are clipped off flat. It is an excess-drive problem, so the choice blaming insufficient collector current has the cause backwards.