From Detector

Fig. 5, Diode in series with AGC line provides fast-attack slow-decay action for use with SSB and CW signals. Waveforms produced by CW character **Rn illustrate the action. (Then detector voltage goes negative at start of each code element. capacitor voltage follows almost instantly. When detector voltage goes positive* diode cuts off and only discharge path for capacitor is the high-value resistor shunting it. This permits AGC control voltage to rise toward ground level, but much more slowly. Re* ceiver gain is restored eventually, but not before next code element arrives* In pauses between words or sentences, however, full gain is available.

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