Kongsberg Simrad SN90 Reference Manual page 6

Simrad SN90
Saving the current user settings..............................................................................79
Defining the ping (transmission) modes.................................................................80
Context-sensitive online help...........................................................................................81
OPERATING PROCEDURES ..................................................... 82
Getting started..................................................................................................................83
Turning on the SN90 system ..................................................................................83
Lowering and hoisting the transducer from the user interface ...............................84
Turning off the SN90 system..................................................................................86
Choosing operating mode and key transmit parameters ..................................................87
Selecting Normal mode to start pinging.................................................................87
Selecting Replay mode ...........................................................................................88
Selecting Inactive mode .........................................................................................89
Setting up the SN90 system for maximum echo refresh rate .................................90
Transmitting single pings .......................................................................................91
Transmitting with fixed-time intervals ...................................................................92
Adjusting the output power to match varying conditions ......................................92
Selecting the best operating frequency...................................................................94
Controlling the gain and range settings ...........................................................................96
Adjusting the gain (echo sensitivity)......................................................................96
Adjusting the TVG (Time Variable Gain) setting ..................................................98
Adjusting the sonar range.......................................................................................99
Adjusting the intensity of the echo presentations.................................................100
Changing the tilt ...................................................................................................101
Adjusting the bearing ...........................................................................................103
Using the markers and tracking features........................................................................105
Starting a position track........................................................................................105
Starting a target track............................................................................................107
Placing a new marker ...........................................................................................108
Deleting a marker .................................................................................................109
Measuring the size of a school relative to the purse seine ................................... 110
Using visual aids during the purse seine catch phase........................................... 111
Selecting a geographical area for accurate target tracking................................... 113
Defining the physical size of the tracking area..................................................... 114
Choosing the fishing gear in use........................................................................... 115
Changing the fishing gear properties to match your own equipment................... 116
Improving the recognition of fish and schools using receiver filters ............................. 118
About the receiver filter sequence in the SN90 system........................................ 118
Reducing noise and reverberation with the AGC (Automatic Gain Control)
function ............................................................................................................ 119
Reducing propeller noise and interference with the Noise Filter .........................121
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381294/E