Furuno CSH-83, CSH-84 manual Adjusting Beamwidth, Setting Noise limiter data setting window Signal

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Setting Noise limiter (data setting window: SIGNAL,

SIGNAL PROCESS)

Weak, unwanted reflections, colored light-blue or green, appear when the water is dirty, plankton layers exists, or due to ship’s noise. The noise limiter (NL) can reduce the effects of these unwanted reflections–raising the setting causes them to become bluish to background color. Normally a setting of 3 or 4 is suffi- cient.

Adjusting Beamwidth

Beamwidth can be adjusted at SONR•BEAM, BEAM on the data setting window.

Table 3-1 Beamwidth adjustment menus

Menu

Application

 

 

 

Set to "0" for normal use. The higher the setting the

HOR

narrower the beam. This control may be used

together with the AGC and NL controls to suppress

 

 

sea surface reflections and seabed echoes.

 

 

 

In case of TX Frequency 75, 81 and 88 kHz.

 

0: This is standard setting. Use for normal

 

conditions.

 

1: This is to suppress the seasurface noises (weak).

 

Between tilt angle 0° and 13°, the lower the tilt

 

angle, the stronger the AGC for near range.

 

2: Same as above "1", but AGC is more effective.

 

3: Sane as above "1", but AGC is effective between

 

tilt angle -5°and 60°.

 

4. Same as above "3", but AGC is more effective.

 

 

 

In case of TX Frequency 94 and 107 kHz.

 

0: This is standard setting. Use for normal

VER

conditions.

 

1: This is used for detecting far range. The output

 

power goes up and the gain (TVG) of near range

 

is supprened.

 

2: This is used for improving the presentation. The

 

output pulselength is shorten and the receiving

 

gain goes up.

 

3. This is to suppress the surface voises. TVG

 

effective area changes as follows;

 

Near: 0 to 100 m

 

Medium: 25 to 400 m

 

Far: More than 100 m

 

4: The vertical beamwidth for TX and RX goes

 

wider than normal.

 

 

3-6

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Contents Color Scanning Sonar 00080806600 Safety Instructions Do not use the equipment for other than its intended purpose Table of Contents PORT/STARBOARD, Horizontal Slice Displays Self Tests This page is intentionally left blank Word to CSH-83/84 Owners FeaturesForeword System Configuration Standard OptionControl Layout on Display Unit and Remote Control Box Control DescriptionMain Panel Main panel control descriptionControl Function Sub Panel ENDSub Panel 2 data setting window Signal AGCProcess 2AGCAlarm SonarUP/TM SonrbeamRemote Control Box + +Turning the Power On/Off Adjusting Screen Brilliance, Control Panel BacklightingOperational Overview Lowering the TransducerSelecting a Display Mode Display mode descriptionSeabed echo and tilt angle Setting the Tilt AngleSelecting a Display Range How to discriminate fish echoes from the seabed Points to considerTilt angle for surface fish Tilt angle and sea surface reflectionsSuitable tilt angle Tilt angle and beam coverageAdjusting the Gain Measuring Range and Bearing to a TargetPage Eliminating Unwanted Feeble Echoes Fine Tuning the PictureHow to adjust TVG Page AGC data setting window SIGNAL, Signal Pulselength data setting window TVGTX,PL2AGC data setting window SIGNAL, Signal Process Suppressing Seabed TailIdentifying noise source Data setting window TVGTX, OutputRejecting Sonar Interference and Noise Changing Tx cycle data setting window Tvgtx CycleAdjusting Beamwidth Setting Noise limiter data setting window SignalMarks and Data Marks, Data and Display ModeNormal display mode Normal display mode w/text Echo sounder combination displayPermanently Displayed Marks and Data History displayErasable Marks and Data Mark/Data DescriptionBearing marker Mark Description Range R Auto Tilt Auto Scan Gain Brill TVG TVG DIM Page Menu Overview User Menu OperationMenu screen location and display mode User Menu Hist DSP/GRPHUser Menu Description Current VEC Save PictureSystem Menu Description FAR TVGTM DSP Target LockBRG Readout Mark SizeMenu Description Data SET Menu Description Color CurveChange Color NET Shoot PlanNET Sonde NET Plot CorrInit SET/TEST Menu Description Defaults Echo TestNET REC Others Event KEYFunction Keys Programming the Function KeysFunction Key Fine Tuning Replaying a Function KeySaving Function Key Settings to a Memory Card Replaying Function Key Settings from a Memory CardThis page is intentionally left blank Finding Fish School Center How to find fish school centerAdvanced Level Operation Tracking a Fish School target lock Tracking a fish schoolErasing target lock mark Choosing target lock modeTarget lock mark appearance Tracking target lock mark Target lock and tilt angleSetting target lock conditions System Menu Target LockDescription of target lock items Detecting Fish Schools Aurally Fish Alarm How to set the fish alarm zoneHow to relocate fish schools Relocating Fish School for Easy ObservationComparing of Fish School Concentration Estimate marks and their dataHow to measure fish speed Measuring Fish School SpeedEvent Mark 10 Event marksEntering an event mark Erasing an event markTrue Motion Display 12 True motion displayPlotting Net Location Mark 13 Net location markObserving Net Behavior 14 Net behaviorTarget Slice Display No. Display Information ApplicationsThis page is intentionally left blank PORT/STARBOARD, Horizontal Slice Displays Port/Starboard displayHorizontal slice display Horizontal slice displayMemory Card Operations Initializing Memory CardsSaving the Picture Transferring Echo Data from Internal Memory to Memory CardNet shooting data contents Saving Net Shooting DataHow net shooting data is saved Transferring net shooting data to memory cardDeleting Memory Card Contents Replaying Saved DataTurning marks on/off through the user menu Turning marks on/off through the data setting windowTurning MARKS, Data ON/OFF 10-2 Interpreting the Display Seabed EchoesFish Schools Sea surface fishSea Surface Reflections WakeFalse Echo by Sidelobe Noise and InterferenceOvervoltage Warning Unretracted Transducer WarningHow to manually raise the transducer Self Tests Opening the Self Test MenuContinuous test Self Test DescriptionSingle test Panel test Color testGray test SIO testInterface Unit CS-120A Self Test Interface unit CS-120A, cover opened13-6 Input Data Selection Selection of Data at Interface Unit CS-120ASetting Distances Between Net Sonde Transmitters How to set net sonde transmitter distancesMaintenance Display Unit MaintenanceHull Unit Maintenance Zinc block near the transducer must be replaced yearlyMenu Tree User MenuData SET Menu Init SET/TEST Menu System Menu Previous Page Specifications SP-1Display SP-2Hull Unit SP-3SP-4 Index 11-2IN-2