Kongsberg Simrad SU90 Operator's Manual page 35

presentations will also show this noise. Too much gain may therefore "distort" the
presentation.
Comparing the gain function with the volume control on your car radio is not very
accurate. In fact, the gain in the SU90 system is constant. The
adjust the sensitivity. This is done by controlling the minimum level of detection. When
you increase the gain level (more positive number), you reduce the minimum level of
detection, and thus increase the echo sensitivity.
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
Gain
Tip
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.
Procedure
1 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.
2 Use the joystick to make the adjustment.
Tip
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 or bearing. Investigate the functionality provided on the
This page is located in the
381291/D
function. Increasing the
Gain
setting with the
Installation
with a more positive number
Gain
(Time Variable Gain) setting.
TVG
dialog box.
Getting started
function is used to
Gain
Apply to all
page.
Operating Panel
33