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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, bearing or tilt. Investigate the functionality provided on the
page. This page is located in the
Optionally:
3
Observe the
Main
Its default location is on the right side of the display presentation.
4
Select
.
Gain
5
Make the necessary adjustment.
The following methods can be used to adjust this setting:
a
Select [+] or [-] to choose the requested setting.
b
Place the cursor on the button. Press and hold the left mouse button. Move the
cursor horizontally over the button. Release the mouse button when requested
value is shown.
c
Select the middle of the button to open it. If you have a keyboard connected to
the SN90 system, type the requested value.
6
Open the button and select
the views in the current presentation mode.
381294/E
setting with the
TVG
Installation
menu.
Apply to all
(Time Variable Gain) setting.
dialog box.
if you wish to use the chosen setting in all
Operating procedures
Apply to all
Operating Panel
97
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