Simrad SU90 Operator's Manual page 114

Simrad SU90
9
Ping Sector
The parameter is used to select the type of search sector the SU90 shall
Sector
use; Omni or Sector
Use Omni to transmit in 360 degrees, or Sector to transmit a single beam
10
Frequency
This parameter is used to control the transmitter and receiver operational frequency.
11
TVG
The parameter allows you to choose the Time Variable Gain setting in the
TVG
SU90. This function will automatically adjust the gain in the SU90 to compensate
for geometric spreading and absorption.
12
AGC
This parameter controls the Automatic Gain Control. This function will
automatically reduce the gain if you experience reverberation and noise, or increase
it if the conditions permit it.
13
RCG
This parameter is used to control the Reverberation Controlled Gain. This function
will automatically remove unwanted reverberation from the bottom or from the sea
surface. It may however also remove scattered fish from the presentation.
14
Noise Filter
This parameter allows you to control the built-in filter designed to remove unwanted
acoustic noise from the SU90 presentation.
It will reduce the interference from other acoustic systems (sonars and echo
sounders) on your own vessel and from other vessels in the vicinity. It will also
suppress the noise from your own and other vessels' propellers, and from other
similar noise sources.
15
Bottom Filter
The
Bottom Filter
of the bottom echoes when searching for targets close to the bottom.
16
PP Filter
This parameter controls the ping-ping filter, which reduces the amount of unwanted
noise and echoes on the screen. The filter will only show you the echoes if they are
still present after several consecutive pings (2, 4 or 8). This function will provide
you with a more stable echo presentation, as spurious echoes will be suppressed.
17
Help
Click this button to open the online help system.
→ Online help on page 60
18
Status
The parameter dialog contains a transducer position indicator, as well as
Status
presentation of current time, date, latitude, longitude, heading and speed. Some of
the buttons allow you to adjust these parameters.
112
parameter dialog provides a digital filter to decrease the influence
381291/B