Furuno MODEL CSH-73 manual Suppressing Seabed Tail, AGC data setting window SIGNAL, Signal

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Suppressing Seabed Tail

AGC (data setting window: SIGNAL, SIGNAL

PROCESS)

The AGC functions to automatically reduce the receiver gain only against strong echoes such as the seabed or a large fish school. Since weak echoes remain unaffected, a small fish school becomes easier to detect. Adjust it so that the AGC works only on seabed reflections. Do not set it too high; weak echoes may be missed.

Pulselength (data setting window: TVG•TX, PL)

The pulselength control determines the length of the transmis- sion pulse emitted into the water. While a longer pulse is advan- tageous for long range sounding, it has the disadvantage of being poor in discrimination of targets, that is, ability to separate sev- eral closely located targets. When searching bottom fish, there- fore, it is useful to shorten the pulselength in order to separate fish echoes from seabed reflections. Decrease the PULSELENGTH setting to shorten the pulselength. For search of surface and midwater fish in which seabed reflections are not so strong, use the longest pulselength “10”.

2AGC (data setting window: SIGNAL, SIGNAL PROCESS)

While it is ideal to suppress seabed echoes with the AGC con- trol alone there are some fishing grounds where this is not pos- sible. (The high power sonar has the advantage of long-range detection but this can also be a disadvantage, since weaker ech- oes may be hidden in strong, unwanted echoes such as the sea- bed.)

If you cannot suppress seabed echoes or sea surface reflections by the AGC control alone, use the 2AGC control. Normally a setting of 2 or 3 is suitable. For especially strong echoes, use a setting of 4 or 5.

AR, -4 to 1: Adjusts horizontal beamwidth 2AGC function is fixed at “3”.

0:2AGC function is off.

1 to 5: Larger the number, the greater the effect of 2AGC.

3-3

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Contents Color Scanning Sonar 00080806200 Safety Instructions Table of Contents Function Keys Maintenance Word to CSH-73 Owners FeaturesForeword 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 BoxLowering the Transducer Turning the Power On/OffAdjusting Screen Brilliance, Control Panel Backlighting Operational OverviewDescription Selecting a Display ModeMode NormalSelecting 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 TVGSuppressing Seabed Tail AGC data setting window SIGNAL, SignalPulselength data setting window TVGTX, PL 2AGC data setting window SIGNAL, Signal ProcessRejecting 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 SonrbeamHOR Adjusting BeamwidthMenu Application This page is intentionally left blank Marks and Data Marks, Data and Display ModeNormal display mode 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 User Menu Operation Menu How to openUser Menu Overview 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 lockErasing target lock mark Choosing target lock modeTarget lock mark appearance 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/OffData to Save Saving Method Saving to SAVING, Replaying PictureInitializing Memory Cards Transferring Echo Data from Internal Memory to Memory Card Saving the PictureTransferring net shooting data to memory card Net shooting data contentsSaving Net Shooting Data How net shooting data is savedReplaying Saved Data Deleting Memory Card ContentsSeabed Echoes Interpreting the DisplayBottom Fish School Fish SchoolsSurface 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 TestsContinuous test Self Test DescriptionSingle 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 DescriptionMark Size Menu DescriptionBRG Readout Interlock DefaultsES/NET REC Hist DisplayColor Curve Data SET Menu DescriptionChange Color MenuNET Plot Corr NET ShootPlan NET SondeInit SET/TEST Menu Description Others Event KEY Echo TestNET REC 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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