Furuno MODEL CSH-73 Rejecting Sonar Interference and Noise, Data setting window TVGTX, Output

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Suppressing Seabed and Sea Surface Reflections in Shallow Waters

Data setting window: TVG•TX, OUTPUT

In shallow fishing grounds with hard or rocky bottom, seabed reflections often interfere with wanted fish echoes and they can not be eliminated sufficiently with the aforementioned TVG and AGC controls, especially when the TILT is set to a larger angle in order to track fish schools approaching within 400 m. In such cases try to reduce the output power by adjusting the OUTPUT control instead of turning down the gain. The picture becomes clearer when output power is reduced rather than when the GAIN is decreased as illustrated below.

WRONG

METHOD

Fish echo

Seabed echo

 

 

 

 

TVG and AGC

False seabed echo

 

Surface echo

 

adjusted with

 

 

 

OUTPUT kept high

 

CORRECT

 

METHOD

Fish echo

 

OUTPUT decreased

 

with GAIN kept

 

constant

Figure 3-3 How to suppress seabed and sea surface reflections in shallow waters

Rejecting Sonar Interference and Noise

While observing the sonar picture, you may encounter occasional or intermittent noise and interference. These are mostly caused by on-board electronic equipment, engine or propeller noise, or electrical noise from other sonars being operated nearby.

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Contents Color Scanning Sonar 00080806200 Safety Instructions Table of Contents Function Keys Maintenance Features ForewordWord to CSH-73 Owners System Configuration StandardControl Layout on Display Unit and Remote Control Box Control DescriptionPower Transducer Main PanelControl Function Sub Panel Control FunctionSub Panel 2 data setting window This example shows settings of TVG and TXMain Setting Description Normal Range Sub Main Setting Description Normal Sub Range Remote Control Box + +Turning the Power On/Off Adjusting Screen Brilliance, Control Panel BacklightingOperational Overview Lowering the TransducerSelecting a Display Mode ModeNormal DescriptionSetting the Tilt Angle Selecting a Display RangeAdjusting the Gain Measuring Range and Bearing to a TargetFine Tuning the Picture Eliminating Unwanted Feeble EchoesHow to adjust TVG Principle of TVGAGC data setting window SIGNAL, Signal Pulselength data setting window TVGTX, PL2AGC data setting window SIGNAL, Signal Process Suppressing Seabed TailData setting window TVGTX, Output Rejecting Sonar Interference and NoiseChanging Tx cycle data setting window Tvgtx Identifying noise sourceSetting F-shift data setting window Sonrbeam Noise limiter data setting window SIGNAL, Signal ProcessAdjusting Beamwidth Menu ApplicationHOR This page is intentionally left blank Marks, Data and Display Mode Normal display modeMarks and Data Normal display mode w/text Echo sounder combination displayPermanently Displayed Marks and Data History displayErasable Marks and Data Mark/Data DescriptionRange and Bearing Mark Data Mark Description Net sonde transmitters with bars extending from the marks This page is intentionally left blank Menu How to open User Menu OverviewUser Menu Operation Menu screen location and display mode User Menu Hist DSP/GRPHUser Menu Description Menu Menu Item DescriptionCurrent VEC Save PictureFunction 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 Advanced Level Operation Finding Fish School CenterTracking a Fish School target lock Tracking a fish schoolChoosing target lock mode Target lock mark appearanceErasing target lock mark 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 markSetting Distances Between Net Sonde Transmitters How to set net sonde transmitter distancesObserving Net Behavior 16 Net behaviorPort/Starboard, Horizontal Slice Displays Port/Starboard displayHorizontal slice display 18 Horizontal slice displayTurning Marks, Data On/Off Turning marks on/off through the user menuSAVING, Replaying Picture Initializing Memory CardsData to Save Saving Method Saving to Saving 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 DataInterpreting the Display Seabed EchoesFish Schools Surface Fish SchoolBottom Fish School Sea Surface Reflections WakeFalse Echo by Sidelobe Noise and InterferenceOvervoltage Warning Unretracted Transducer WarningHow to manually raise the transducer Self Tests Opening the Self Test MenuSelf Test Description Single testContinuous test Panel test Color testGray test SIO testInterface Unit CS-120A Self Test Interface unit CS-120A, cover openedThis page is intentionally left blank Maintenance Display Unit MaintenanceHull Unit Maintenance Zinc block near the transducer must be replaced yearlySpecial Menu Description System Menu DescriptionMenu Description BRG ReadoutMark Size Defaults ES/NET RECHist Display InterlockData SET Menu Description Color CurveMenu Change ColorNET Shoot PlanNET Sonde NET Plot CorrInit SET/TEST Menu Description Echo Test NET RECOthers Event KEY Menu Tree User MenuData SET Menu Init SET/TEST Menu System Menu From Previous This page is intentionally left blank Specifications SP-1Display SP-2Features SP-3This page is intentionally left blank Index 13-4IN-2

MODEL CSH-73 specifications

The Furuno MODEL CSH-73 is a cutting-edge marine radar that embodies innovative technology and exceptional performance, designed specifically for commercial vessels and professional mariners. This model represents a significant advancement in radar capabilities, enhancing both navigational safety and operational efficiency.

One of the standout features of the CSH-73 is its compact design paired with a high-resolution display. The radar boasts a 12.1-inch color LCD screen that provides a crisp and clear view, allowing operators to easily identify targets and navigate in challenging conditions. The intuitive user interface facilitates quick access to essential radar functions, making it user-friendly even for those who may not be experts in radar operation.

A notable technological advancement in the CSH-73 is its digital signal processing (DSP) technology, which dramatically improves target detection capabilities, especially in adverse weather conditions. This technology helps to filter out noise and clutter, enabling the radar to provide accurate readings and reliable targeting information. The advanced target tracking capabilities allow users to monitor multiple vessels simultaneously, enhancing situational awareness.

In addition to its impressive detection capabilities, the CSH-73 features an Automatic Radar Plotting Aid (ARPA), which aids in collision avoidance by tracking the course and speed of approaching vessels. This sophisticated system simplifies decision-making for the crew, promoting safer navigation.

Another key innovation is the integration of Ethernet and NMEA 2000 connectivity. This feature enables seamless integration with other onboard systems, such as chart plotters and autopilots, creating a comprehensive navigation network. This connectivity allows for real-time data sharing, which enhances the overall operational effectiveness of the vessel.

The CSH-73 is also equipped with a range of customizable settings, allowing mariners to tailor the radar display to their specific needs and preferences. Features such as adjustable gain, sea clutter, and rain clutter suppression enhance the radar's performance under various environmental conditions.

Constructed with durability in mind, the CSH-73 adheres to robust marine standards, ensuring reliable performance even in the harshest maritime environments. This resilience is crucial for commercial vessels that regularly operate in challenging conditions.

In summary, the Furuno MODEL CSH-73 stands out as a powerful tool for enhancing maritime safety and navigation. Its advanced technologies, user-friendly interface, and durable construction make it an essential component for modern vessels, providing mariners with the confidence they need to operate effectively in any navigational scenario. The CSH-73 continues to uphold Furuno's reputation for excellence in marine electronics, making it a trusted choice for professionals worldwide.
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