Furuno CSH-5L/CSH-8L - Manual (Page 5)

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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