Why is automatic level control (ALC) used with an RF power amplifier?
To balance the transmitter audio frequency response
To reduce harmonic radiation
To prevent excessive drive✓Correct answer
To increase overall efficiency
Explanation
Automatic level control samples the amplifier drive or output and feeds a correction back to reduce the exciter's output when drive would push the amplifier beyond its linear range. Without it, overdrive produces flat-topping, splatter and distortion.