Question 13B4

Automatic Gain Control (AGC) systems are vital for maintaining a consistent audio output level despite fluctuations in the received signal strength. For Single Sideband (SSB) voice, which inherently has widely varying amplitude due to the nature of speech, AGC characteristics are particularly critical. A **fast attack** is desirable because it allows the AGC circuit to quickly reduce receiver gain when a strong signal or speech peak arrives. This prevents distortion, harsh clipping, and sudden, uncomfortable bursts of loudness, protecting both the receiver's audio stages and the listener's ears. A **slow decay** is equally important. After a speech peak subsides, the gain should not immediately increase. A slow decay holds the reduced gain for a short period, preventing the background noise level from "pumping" up and down between words or syllables. This creates a much more stable, less fatiguing listening experience. Options with slow attack would allow strong signals to blast through before the gain reduces. Options with fast decay would cause severe noise pumping, making SSB reception difficult and tiring.