Kongsberg Simrad ST90, Reference Manual

Page: 127 / 690

442704/A
125
Adjusting the intensity of the echo presentations
The effect of the
Gain
adjustment is minimized if you apply
RCG
(Reverberation Controlled
Gain) and
AGC
(Automatic Gain Control). The
Display Gain
is applied at the end of the
filter sequence in the ST90 system. This means that you can use
Display Gain
if you are not
completely satisfied with the results of the automatic gain functionality.
Context
Display Gain
controls the "amount" of echo that is displayed, in other words the "strength"
or "intensity" of the echo presentation. The function thus increases or decreases the
presentation of the echo colours. Use this setting together with
Gain
to adjust the sensitivity
of the ST90 system.
For all practical purposes, adjusting
Display Gain
has the same effect as adjusting
Gain
.
Adjust the
Display Gain
so that you can see the targets without too much noise and
reverberation. The chosen setting is a matter of personal preferences.
Procedure
1 Open the
Display
menu.
2 Select
Display Gain
.
3 Adjust the setting to fit your requirements.
To change the setting, move the cursor to either
side of the button. Select the
left side of the
button to decrease the value. Select the right side of the button to increase the value.
Select the middle of the button to open it.If you have a keyboard connected to the
ST90 system, type the requested value.
Related topics
Operating procedures, page 79
Controlling the gain and range settings, page 94
Improving the recognition of fish and schools using receiver filters, page 117
Display Gain function, page 444
Operating procedures