Installation manual

Operational procedures
Gain adjustment procedures
This section explains how to control the manual and automatic
gain settings on the SH80 sonar.
How to adjust the gain
You can adjust the sonar gain by means of the control buttons
on the Operating Panel, or by using the
Gain button on the
Horizontal and Vertical menus.
Gain
H-
Gain
H+
Gain
V-
Gain
V+
1 On the Operating Panel, locate the Gain field.
2 Press the
Gain H+ or Gain H- buttons to increase
or decrease
the gain in the horizontal presentation.
3 Press the
Gain V+ or Gain V- buttons to increa
se or decrease
the gain in the vertical presentati
on.
4 In the sonar’s menu system, click th
e
Gain button on the
Horizontal or Vertical menus to a
djust the gain.
Click the left or right side of the
Gain buttontodecreaseor
increase the gain, or the middl
e of the button to open the
parameter dialogue.
For more information abo
ut this parameter, see About Gain on
page 173.
How to adjust the RCG
The RCG (Reverberation Controlled Gain) regulates the r eceiver
gain individually for each of the receiving beams. If you select
a small or medium value, echoes from propellers, surface and
bottom reverberations will be suppressed, while target echoes
will remain in view. If you select a strong filter setting, it will
remove the bottom, while echoes on the bottom will be presented.
Note
Scattered fish can be perceived as reverberation. The RCG
function must therefore be used with care if you wish to find
scattered schools.
1 Click the Horizontal or Vertical tab to open the respective
menu.
2 Click the
RCG button to adjust the parameter.
Click the left or right side of the
RCG button to decrease
or increase the setting, or the middle of the button to open
the parameter dialogue.
For m ore information about this parameter, see What is RCG?
on page 173.
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