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Figure 34 Beam widths: Wide (A), Normal (B) and Narrow (C)
307670/D
About beam widths
A narrow beam will always reach further than a wide beam. This
is because the transmitted power of the sonar is concentrated.
Nevertheless, you can easily "miss" a school of fish if you make
the beam too narrow. If the range is reduced, it is the common to
use a wider beam.
Default setting on the SX90 sonar is
basically designed for longer ranges.
You may also try setting
adjust the beam width depending on the current range.
About Gain
You can adjust the gain in many different ways, but the most
important is the setting made by the
Operating Panel and on the
If you have too much gain, you will see a sonar picture with too
many echoes. This is because the large amplification presents all
kind of noise and reverberation that the sonar picks up. If the
gain is smaller the noise and reverberation will disappear, but if it
the gain is too small the fish echoes may disappear as well. In
most cases you should try with a medium value. On the SX90
sonar, the default value is set to 30.
On this sonar, you can adjust the horizontal and vertical gain
independent of each other. The horizontal gain is used when the
sonar operates in a horizontal mode, for example Bow up or True
motion. If you switch to a mode with a vertical view, for example
True motion/Vertical, your sonar will need a different gain setting
for the beams directed towards the bottom.
To adjust the gain, see How to adjust the gain on page 37.
. This setting is
Normal
. This setting will automatically
Auto
buttons on the
Gain
and
Horizontal
Vertical
Basic theory
menus.
185
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