Simrad TV80, Справочное руководство

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operating on the TV80 frequency range. This filter has been implemented to remedy
for such interference problems as well.
Note
We recommend that you switch this filter On if there are large fluctuations in
the displayed data, or if the rate of change is small. No filtering is preferable if
instantaneous readings are required, since this shortens the delay between updating
the changes in sensor data, and the corresponding displayed information.
Water Profile
Use this setting to set up the TV80 for operation in fresh or salt water.
Detection Threshold (DT)
This parameter is used to control the threshold level for detection of signals. Signals
below the threshold level will not be detected, while signals above the threshold will
be detected. Setting the threshold level too low may cause false signals to be detected.
If the detection threshold is set too high, the signal from the catch monitoring sensor
will not be detected.
For the TV80 system, two different parameter ranges are used.
•
3 to 14
By increasing the parameter value, the threshold level is increased.
•
15 to 20
By increasing the parameter value, the threshold level is decreased.
The default value for
Detection Threshold (DT)
is 17 .
Max shooting speed
The TV80 has a built-in Doppler compensation function which is set up using this
parameter. The parameter and related function is, however, only relevant if sensor data
is desired while the purse seine or trawl is being deployed. It has no effect once the
vessel is stopped and waiting for the net or trawl to sink.
Note
If you set this parameter too high, you may create a conflict with the channel selection.
Related topics
Defining receiver parameters for the PI50 and PI60 Receiver Units, page 42
Adjusting the receiver sensitivity for the PI50 and PI60 Receiver Units, page 124
Reducing noise disturbance from the data received on a SR15 or SR70 Receiver Unit,
page 125
Functions and dialog boxes