Simrad SN90, Operator'S Manual

Page: 83 / 188

381295/B
81
Procedure
1 Click in any view to make it active.
The active view is identified with a thicker border.
2 Open the
Active
menu.
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
Improving the recognition of fish and schools using receiver filters, page 79
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 SN90 are implemented in “series”. The noise filtering is done in two
stages early in the receiver process.
Procedure
1 Click in any view to make it active.
The active view is identified with a thicker border.
Operating procedures