Kongsberg Simrad ST90, Reference Manual

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When the ST90 system is turned on,
Tx Power
is by default set to Off . This is a safety
precautions to prevent inadvertent transmissions when the vessel is in dry dock.
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.
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.
To change the setting, move the cursor to either side of the button. Select the left side of the
button to decrease the value. Select the right side of the button to increase the value. You
can also select the middle of the button to open a small menu with the options available.
Related topics
Choosing operating mode and key transmit parameters, page 84
Functions and dialog boxes, page 416
Operation menu; Functions and dialog boxes, page 430
Record RAW function
Record RAW
allows you to record the unprocessed echo data received by the transducer.
You can save the data to the hard disk, or onto an external storage device. The data files can
be played back on the ST90 system. You can keep the recorded files for future reference,
training purposes and calibration.
How to open
This function is opened from the
Operation
menu.
Simrad ST90 Reference Manual