Kongsberg Simrad SN90 Reference Manual page 71

Purse seine and trawling sonar

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The echo strength (A) changes with time. The minimum level of detection (B) is adjusted

up or down with the

reduces the minimum level, and this increases the sensitivity. Only echoes over the

minimum level are shown in the echogram (C).

Do not confuse this

During normal operating conditions we recommend that you keep the gain between 15

and 30. If you need to adjust the gain "from scratch" disable AGC (Automatic Gain

Control) and RCG (Reverberation Controlled Gain) to see the immediate effect of the

gain adjustments. While you adjust the gain you may find it useful to have a known

target (for example an island) as reference.

Click in the view you want to activate.

The active view is identified with a thicker border. Unless you use the

function, all changes you make will only be applied to this view.

Use the joystick to make the adjustment.

Optionally: Turn the relevant rotary switch to make the adjustment.

The Mk2 Operating Panel is fitted with three rotary switches. The switches are

identified with numbers. Each switch can be assigned a function related to range,

gain, bearing or tilt. Investigate the functionality provided on the

page. This page is located in the

Its default location is on the right side of the display presentation.

function. Increasing the

setting with the

Installation

with a more positive number

(Time Variable Gain) setting.

Getting started

Apply to all

Operating Panel

Chapters

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