Furuno MODEL CSH-73 manual Fine Tuning the Picture, Eliminating Unwanted Feeble Echoes

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FINE TUNING THE PICTURE

This chapter provides the information necessary for tuning the sonar picture. All operations are performed on sub panel 2 (data setting window).

Sub Panel 2

Figure 3-1 Display unit

Eliminating Unwanted Feeble Echoes

Echoes from targets such as seabed and fish return to the trans- ducer in order of distance to them, and when we compare their intensities at the transducer face, those from nearer targets are generally stronger when their reflecting properties are nearly equal. The sonar operator will be quite inconvenienced if these echoes are directly displayed on the screen, since he can not judge the actual size of the target from the size of echoes dis- played on the screen. To overcome this inconvenience, the TVG function is incorporated. It compensates for propagation loss of sound in water; amplification of echoes on short range is sup- pressed and gradually increased as range increases so that simi- lar targets are displayed in the similar intensities irrespective of the ranges to them.

The CSH-73 has three TVG functions, NEAR, MEDIUM and FAR, and they mainly compensate for propagation loss on short, middle and long ranges respectively, centered at the ranges shown in the figure on the next page. The higher the TVG setting the greater the amplification of echoes.

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Contents Color Scanning Sonar 00080806200 Safety Instructions Table of Contents Function Keys Maintenance Features ForewordWord to CSH-73 Owners Standard System ConfigurationControl Description Control Layout on Display Unit and Remote Control BoxMain Panel Power TransducerControl Function Control Function Sub PanelThis example shows settings of TVG and TX Sub Panel 2 data setting windowMain Setting Description Normal Range Sub Main Setting Description Normal Sub Range + + Remote Control BoxAdjusting Screen Brilliance, Control Panel Backlighting Turning the Power On/OffOperational Overview Lowering the TransducerMode Selecting a Display ModeNormal DescriptionSelecting a Display Range Setting the Tilt AngleMeasuring Range and Bearing to a Target Adjusting the GainEliminating Unwanted Feeble Echoes Fine Tuning the PicturePrinciple of TVG How to adjust TVGPulselength data setting window TVGTX, PL AGC data setting window SIGNAL, Signal2AGC data setting window SIGNAL, Signal Process Suppressing Seabed TailRejecting Sonar Interference and Noise Data setting window TVGTX, OutputIdentifying noise source Changing Tx cycle data setting window TvgtxNoise limiter data setting window SIGNAL, Signal Process Setting F-shift data setting window SonrbeamAdjusting Beamwidth Menu ApplicationHOR This page is intentionally left blank Marks, Data and Display Mode Normal display modeMarks and Data Echo sounder combination display Normal display mode w/textHistory display Permanently Displayed Marks and DataMark/Data Description Erasable Marks and DataRange 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 User Menu Hist DSP/GRPH Menu screen location and display modeMenu Menu Item Description User Menu DescriptionSave Picture Current VECProgramming the Function Keys Function KeysReplaying a Function Key Function Key Fine TuningReplaying Function Key Settings from a Memory Card Saving Function Key Settings to a Memory CardThis page is intentionally left blank Finding Fish School Center Advanced Level OperationTracking a fish school Tracking a Fish School target lockChoosing target lock mode Target lock mark appearanceErasing target lock mark Target lock and tilt angle Tracking target lock markSystem Menu Target Lock Setting target lock conditionsDescription of target lock items Detecting Fish Schools Aurally How to set the fish alarm zone Fish AlarmRelocating Fish School for Easy Observation How to relocate fish schoolsEstimate marks and their data Comparing of Fish School ConcentrationMeasuring Fish School Speed How to measure fish speed10 Event marks Event MarkErasing an event mark Entering an event mark12 True motion display True Motion Display13 Net location mark Plotting Net Location MarkHow to set net sonde transmitter distances Setting Distances Between Net Sonde Transmitters16 Net behavior Observing Net BehaviorPort/Starboard display Port/Starboard, Horizontal Slice Displays18 Horizontal slice display Horizontal slice displayTurning marks on/off through the user menu Turning Marks, Data On/OffSAVING, Replaying Picture Initializing Memory CardsData to Save Saving Method Saving to Transferring Echo Data from Internal Memory to Memory Card Saving the PictureSaving Net Shooting Data Net shooting data contentsHow net shooting data is saved Transferring net shooting data to memory cardReplaying Saved Data Deleting Memory Card ContentsSeabed Echoes Interpreting the DisplayFish Schools Surface Fish SchoolBottom Fish School Wake Sea Surface ReflectionsNoise and Interference False Echo by SidelobeUnretracted Transducer Warning Overvoltage WarningHow to manually raise the transducer Opening the Self Test Menu Self TestsSelf Test Description Single testContinuous test Color test Panel testSIO test Gray testInterface unit CS-120A, cover opened Interface Unit CS-120A Self TestThis page is intentionally left blank Display Unit Maintenance MaintenanceZinc block near the transducer must be replaced yearly Hull Unit MaintenanceSystem Menu Description Special Menu DescriptionMenu Description BRG ReadoutMark Size ES/NET REC DefaultsHist Display InterlockColor Curve Data SET Menu DescriptionChange Color MenuPlan NET ShootNET Sonde NET Plot CorrInit SET/TEST Menu Description Echo Test NET RECOthers Event KEY User Menu Menu TreeData SET Menu Init SET/TEST Menu System Menu From Previous This page is intentionally left blank SP-1 SpecificationsSP-2 DisplaySP-3 FeaturesThis page is intentionally left blank 13-4 IndexIN-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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