Installation manual

Simrad SP70

850-164186 / Rev.D

AGC (Automatic Gain Control)

The AGC parameter is accessed from the Horizontal, Vertical ,

Echo sounder and Trawl menus.

The AGC (Automatic Gain Control) adjusts the gain in the

sonar’s preamplifier circuitry. This gain depends on the strength

of the incoming echo signal. The result is a filter effect,

reducing noise and reverberation. As show in the menu, the

AGC has four different settings.

Off - no gain adjustment

Weak - slow gain adjustment

Medium - medium fast gain adjustment

Strong - fast gain adjustment

Note that the AGC is sensing the echo strength in five

directions, and use this as a basis for common adjustment for all

the receiver beams.