Simrad TV80, Reference Manual

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406388/B
Catch/Bottom Filter
The
Catch/Bottom Filter
is used to restrict the change of state from the catch and
bottom contact sensors. This will reduce jitter in the presentation. When the filter is
switched off any change in measurement status will immediately be shown in the
presentation. The default setting of the filter is
Weak .
The following options are available.
•
Off
The filter is switched off.
•
Weak
The information provided from the sensors must be stable for at least two
consecutive transmissions. If this is not the case, the information is not shown in
the TV80 presentation.
•
Medium
The information provided from the sensors must be stable for at least four
consecutive transmissions. If this is not the case, the information is not shown in
the TV80 presentation.
•
Strong
The information provided from the sensors must be stable for at least eight
consecutive transmissions. If this is not the case, the information is not shown in
the TV80 presentation.
AGC (Automatic Gain Control)
The
AGC
(Automatic Gain Control) function runs an automatic analysis of the echo
strength. During normal operation, On is the recommended (and default) setting.
Manual Gain
This function allows you to apply a selected amount of gain to the receiver circuitry. If
you decide to switch the AGC off you must set the gain manually.
The default and recommended setting is Medium .
Multipath Filter
The
Multipath Filter
is designed to remedy for reflections, spikes and time-lag in the
sensor data. These problems may occur if neighbouring channels are used, or if the
TV80 is disturbed by other hydroacoustic systems in use on your own or other vessels.
When you operate in areas with substantial reverberation due to the bottom conditions,
or in shallow waters, you may experience “jumps” or spikes in the data received from
the sensors. Such errors can also be caused by other types of hydroacoustic equipment
Simrad TV80 Reference Manual