Adjusting The Echo Sensitivity - Simrad SN90 Operator's Manual

Simrad SN90 Operator Manual
Tip
The Operating Panel is fitted with three rotary switches. The switches are identified
with numbers. Each switch can be assigned a function related to range, gain or
bearing. Investigate the functionality provided on the
page is located in the
Optionally:
3 Observe the
Main
Its default location is on the right side of the SN90 presentation.
4 Select .
Range
5 Make the necessary adjustment.
The following methods can be used to adjust this setting:
a Select [+] or [-] to choose the requested setting.
b Place the cursor on the button. Press and hold the left mouse button. Move the
cursor horizontally over the button. Release the mouse button when requested
value is shown.
c Select the middle of the button to open it. If you have a keyboard connected to
the SN90, type the requested value.
d Select the middle of the button to open it. Select a value from the options
provided.
6 Open the button and select
the views in the current presentation mode.
Related topics
Starting normal operation, page 26

Adjusting the echo sensitivity

Some echoes are weak while others are stronger. To compensate for this it is often
necessary to adjust the sensitivity of the SN90. This adjustment is commonly referred
to as gain.
Context
You can compare this gain setting with the volume control on your car radio. When
the gain is increased, the echoes will appear stronger. Weak echoes will be easier to
see. However, since you also increase the acoustic noise in the reception, the SN90
presentations will also show this noise. Too much gain may therefore "distort" the
presentation.
36
dialog box.
Installation
menu.
if you wish to use the chosen setting in all
Apply to all
page. This
Operating Panel
381295/B