Kongsberg Simrad SU90 Operator's Manual page 6

Simrad SU90
Transmitting with fixed-time intervals ...................................................................54
Adjusting the output power to match varying conditions ......................................55
Selecting the best operating frequency...................................................................56
Controlling the gain and range settings ...........................................................................58
Adjusting the gain (echo sensitivity)......................................................................58
Adjusting the TVG (Time Variable Gain) setting ..................................................60
Adjusting the sonar range.......................................................................................60
Expanding the range within the sonar view ...........................................................62
Adjusting the intensity of the echo presentations...................................................63
Changing the tilt .....................................................................................................63
Adjusting the bearing .............................................................................................65
Using the markers and tracking features..........................................................................68
Starting a position track..........................................................................................68
Starting a target track..............................................................................................69
Placing a new marker .............................................................................................70
Deleting a marker ...................................................................................................71
Measuring the size of a school relative to the purse seine .....................................72
Using visual aids during the purse seine catch phase.............................................72
Selecting a geographical area for accurate target tracking.....................................74
Defining the physical size of the tracking area.......................................................75
Choosing the fishing gear in use.............................................................................76
Changing the fishing gear properties to match your own equipment.....................77
Improving the recognition of fish and schools using receiver filters ...............................78
About the receiver filter sequence in the SU90 system..........................................78
Reducing noise and reverberation with the AGC (Automatic Gain Control)
function ..............................................................................................................79
Reducing propeller noise and interference with the Noise Filter ...........................80
Reducing bottom and surface reverberation with the RCG (Reverberation
Controlled Gain) function..................................................................................81
Reducing noise and false echoes with the Ping-Ping Filter ...................................83
Reducing the strong bottom echo to see fish close to the seabed...........................84
Adjusting the intensity of the echo presentations...................................................84
Recording and replaying echo data..................................................................................86
Defining the file and folder settings for data recording..........................................86
Recording echo data ...............................................................................................87
Accessing the echo data files to delete, move or copy them ..................................88
Selecting Replay mode ...........................................................................................89
Choosing which echo data file(s) to replay ............................................................90
Setting up presentation modes and views ........................................................................92
Moving a view to another display ..........................................................................92
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