Maintaining the peak RF output of a SSB transmitter at a relatively constant level requires a circuit called the:

In a Single Sideband (SSB) transmitter, speech input can vary wildly in amplitude. To prevent the transmitter's final amplifier from being overdriven, which causes splatter and distortion, an Automatic Level Control (ALC) circuit is used. The ALC circuit monitors the RF output and feeds back a control voltage to earlier amplifier stages, reducing their gain when the output peaks too high. This ensures the peak RF output remains relatively constant without exceeding the transmitter's limits. Other options like Automatic Gain Control (AGC) and Automatic Volume Control (AVC) are typically found in the receiver to maintain a constant audio output level despite varying incoming signal strengths, rather than controlling transmitter output power.