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
1.6.3
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
