Kongsberg Simrad ST90, Reference Manual

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Adjusting the output power to match varying conditions
You are permitted to adjust the output power from the ST90 system.
Tx Power
is used to
control the amount of power that is transmitted with each ping.
Context
Most users operate the ST90 system with
Tx Power
set to
Maximum
. This allows for
maximum range, and works well in open waters with sufficient depth. Certain operating
conditions may make it appropriate to adjust the output power. Use
Tx Power
to reduce the
transmitted acoustic energy compared to the maximum output.
Tip
If you work in shallow and/or confined waters you may find it useful to reduce the output
power to avoid reverberation.
Some of our users claim that reducing the output may be useful if you are looking for
scattered fish.
If you work in vicinity of other vessels using hydroacoustic systems in the same frequency
range as your ST90 system, interference may cause problems. Reducing the output power is
not a practical way to deal with interference. It is more efficient to change the operating
frequency.
To investigate unknown and/or unfamiliar targets, some user prefer to "reset" the ST90
system by turning off all the receiver filters and adjust the output power.
Sea conditions vary, sometimes drastically. The acoustic conditions are also changing.
Temperature and salinity layers differ from one day to the next, and from one position to
another. It is not possible to identify settings that will provide the best data at all times.
Procedure
1 Open the
Operation
menu.
2 Select
Tx Power
.
3 Select the requested output power.
Select either side of the button to choose a value.
Select the middle of the button to open a small menu with the available options.
Operating procedures