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iii
TABLE OF CONTENTS
FOREWORD .................................................................................................................vi
SYSTEM CONFIGURATION.......................................................................................vii
1. OPERATIONAL OVERVIEW................................................................................ 1-1
1.1 Control Unit................................................................................................................1-1
1.2 Remote Controller (option).........................................................................................1-2
1.3 Basic Operating Procedure........................................................................................1-3
1.3.1 Turning on the power.......................................................................................1-3
1.3.2 Lowering the transducer ..................................................................................1-3
1.3.3 Transmitting.....................................................................................................1-4
1.3.4 Adjusting backlighting of control unit................................................................1-5
1.3.5 Choosing a display mode.................................................................................1-6
1.3.6 Choosing the display range..............................................................................1-8
1.3.7 Adjusting the gain............................................................................................1-9
1.3.8 Retracting the transducer, turning off the power...............................................1-9
1.4 Setting the Tilt Angle................................................................................................1-10
1.4.1 Automatic tilt on/off ........................................................................................1-10
1.4.2 Bottom and tilt angle......................................................................................1-12
1.4.3 How to discriminate fish echoes from the bottom...........................................1-12
1.4.4 Points to consider ..........................................................................................1-13
1.4.5 Tilt angle for surface fish................................................................................1-13
1.4.6 Suitable tilt angle ...........................................................................................1-14
1.5 Finding Range and Bearing to a Target....................................................................1-14
1.6 Sonar Menu Overview .............................................................................................1-15
1.6.1 Operating procedure......................................................................................1-15
1.6.2 Sonar menu description.................................................................................1-16
2.
FINE TUNING THE SONAR PICTURE
...................................................................... 2-1
2.1 Eliminating Unwanted Echoes ...................................................................................2-1
2.2 Displaying Surface Fish Clearly .................................................................................2-2
2.3 Suppressing Bottom Tail ............................................................................................2-2
2.3.1 AGC.................................................................................................................2-2
2.3.2 Pulse length.....................................................................................................2-3
2.3.3 2ND AGC.........................................................................................................2-3
2.4 Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds.........2-4
2.5 Rejecting Sonar Interference and Noise.....................................................................2-5
2.5.1 Identifying noise source ...................................................................................2-5
2.5.2 Rejecting noise with the interference rejector...................................................2-5
2.5.3 Rejecting noise with the noise limiter...............................................................2-5
2.5.4 Rejecting interference with TX cycle ................................................................2-6
2.6 Choosing Beamwidth.................................................................................................2-7
2.6.1 Horizontal beamwidth ......................................................................................2-7
2.6.2 Vertical beamwidth...........................................................................................2-7
2.7 Deleting Weak Echoes...............................................................................................2-7
2.8 Echo Averaging..........................................................................................................2-7