Kongsberg Simrad ST90, Reference Manual

Page: 122 / 690

120
442704/A
3 Select
AGC
(Automatic Gain Control).
4 Select a value from the options provided.
The choice you make is by default only applied to the currently selected (active) view.
Select the middle of the button to open a small menu with the available options. Select
the
left side of the button to select a "lower"' menu choice. Select the right side of the
button to select a "higher"' menu choice.
Related topics
Operating procedures, page 79
Improving the recognition of fish and schools using receiver filters, page 117
AGC (Automatic Gain Control) function, page 482
Reducing propeller noise and interference with the Noise Filter
Unless you synchronize the transmissions from your other hydroacoustic systems you may
have an issue with interference. Even with synchronization activated the noise from other
nearby vessels may cause noise.
Context
The
Noise Filter
is used to minimize the interference from other acoustics systems (sonars
and echo sounders) on your own and/or other vessels. The filter also suppresses noise from
your propellers, and from other similar noise sources. The
Noise Filter
is very effective if
you are bothered by strong noise or interference, especially from your own vessel, or even
from other vessels operating near you.
Tip
Use weak filtering - or turn the filter off - if you have strong echoes on short ranges. The
filter may then be too powerful, and distort the echo presentation.
The filters in the ST90 system are implemented in “series”. The noise filtering is done
early in the receiver process.
Procedure
1 Click in any view to make it active.
The active view is identified with a thicker border.
2 Open the
Active
menu.
Simrad ST90 Reference Manual