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Simrad SN90 Operator Manual
Procedure
1
Open the
Operation
2
Set
to Normal.
Operation
3
Set
Transmission Mode
4
Specify the interval between each ping.
a
Select either side of the button to choose a value.
b
Select the middle of the button to open it.
If you have a keyboard connected to the SN90, type the requested value.
You can also change the value by selecting - and holding - the middle of the
button, and move the cursor sideways. Drag the cursor sideways to increase or
decrease the value. Release the mouse button when requested value is shown.
Related topics
Choosing operating mode and key transmit parameters, page 55
Setting up the SN90 for maximum echo refresh rate, page 58
Transmitting single pings, page 59
Adjusting the output power to match varying conditions
You are permitted to adjust the output power from the SN90.
the amount of power that is transmitted with each ping.
Context
Most users operate the SN90 with
range, and works well in open waters with sufficient depth. Certain operating conditions
may make it appropriate to adjust the output power. Use
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 operate in the close vicinity of other vessels that are also using the SN90,
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 SN90
by turning off all the receiver filters and adjust the output power.
60
menu.
to Interval.
set to Maximum. This allows for maximum
Tx Power
is used to control
Tx Power
to reduce the
Tx Power
381295/B
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