Furuno CSH-5L/CSH-8L manual Displaying Surface Fish Clearly, Suppressing Bottom Tail, 1 AGC

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2.FINE TUNING THE SONAR PICTURE

8.On a long range, locate a fish school which is approaching own ship. Note that the tilt should be kept adjusted so that the fish school is always placed in the center of the sonar beam, i.e., so that the fish school is displayed in strongest colors possible. Check that the fish echo is displayed in the same color while it approaches. If the color changes suddenly to weaker colors as the fish echo enters FAR and NEAR areas, the TVG is improperly set. Adjust the TVG to correct it. If this again produces sea surface reflections and noise, try to remove them with the AGC and noise limiter as described later on.

9.Press the [MENU] key to close the menu.

2.2Displaying Surface Fish Clearly

When you are searching for surface fish with the tilt set to a narrow angle, sea surface reflections may disturb or mask wanted fish echoes. In this case, in addition to the TVG adjustment described earlier, adjust AGC on the SONAR menu. Normally set it between “0” and “3.”

2.3Suppressing Bottom Tail

As noted earlier, fish schools (echoes) located near the bottom are sometimes difficult to detect because you have to discriminate them from the bottom reflections. AGC, PULSE LENGTH and 2ND AGC in the SONAR menu, if used properly, decrease the tail of bottom reflections, making it easier to discriminate bottom fish.

2.3.1AGC

The AGC functions to automatically reduce the receiver gain only against strong echoes such as the bottom or a large fish school. Since weak echoes remain unaffected, a small fish school becomes easier to detect. Adjust the AGC so it works only on bottom reflections.

1.Press the MENU key.

2.Use the [RANGE] control to choose [MENU MODE] at the top of the screen.

3.Use the [GAIN] control to choose SONAR to display the SONAR menu.

4.Use the [RANGE] control to choose AGC.

5.Use the [GAIN] control to set AGC value. The setting range is 0-10 and the higher the setting the stronger the AGC effect.

6.Press the [MENU] key to close the menu.

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Contents Color Scanning Sonar 00080940402 Safety Instructions Turn off the hull unit before using the hand crank Table of Contents Marks and Data Index Features ForewordWord to the Owner of the CSH-5L/CSH-8L System Configuration System configuration of CSH-5LVii System configuration of CSH-8L ViiiOperational Overview Control UnitControl unit Remote Controller option Remote controllerBasic Operating Procedure Turning on the powerLowering the transducer Transmitting Sonar menuAdjusting backlighting of control unit System menuNorm Choosing a display modeMode description Description Display COMBI-1COMBI-1 display sonar display + audio display Normal mode display sonar displaySonar display COMBI-1 display sonar display + audio displayCOMBI-2 display sonar display + echosounder display Choosing the display rangeCOMBI-2 display sonar display + echosounder display Detection rangeAdjusting the gain Retracting the transducer, turning off the powerExamples of proper and improper gain Setting the Tilt Angle Automatic tilt on/offTilt range Range and tilt angle Range m ±2-10 ±4-14 ±6-20 ±10-26Auto tilt concept Case 1 Tilt angle 30 to 40 degrees How to discriminate fish echoes from the bottomBottom and tilt angle Case 2 Tilt angle 10 to 20 degreesPoints to consider Tilt angle for surface fishTilt angle and surface fish example CSH-5L Depth, detection range and tilt angle Finding Range and Bearing to a TargetSuitable tilt angle Location of trackball dataOperating procedure Sonar Menu OverviewSonar menu description Description of sonar menuDescription Ref. Description of sonar menu con’t from previous This page intentionally left blank Fine Tuning the Sonar Picture Eliminating Unwanted EchoesHow TVG works Displaying Surface Fish Clearly Suppressing Bottom Tail1 AGC Pulse length 3 2ND AGCHow to adjust TX output Rejecting noise with the interference rejector Rejecting Sonar Interference and NoiseIdentifying noise source Rejecting noise with the noise limiterRejecting interference with TX cycle Interference ringsEcho Averaging Choosing BeamwidthDeleting Weak Echoes Horizontal beamwidthThis page intentionally left blank Advanced Sonar Operation Tracking a Fish School target lockTarget lock mark and target lock data Target lock and tilt angle Detecting Fish Schools Aurally Fish Alarm Fish alarm zoneFish alarm zones Measuring Fish School Speed Entering a fish markFish mark and fish mark data How to use the off-center function Relocating Fish School for Easy ObservationDeleting individual fish marks Event mark How to use the event markEvent Mark, Own Ship Position Mark Entering an event markEntering an own ship position mark Deleting an event markEvent marks Collectively Deleting Marks TrackShip Programming for fishing ground or target fish Function Keys F1-F4Operating the function keys Erase Marks dialog boxTX Output Pulse Length TX Cycle TVG Near TVG FAR HOR Programming specific functionUseful programs main items only Beamwidth Color Curve ResponseConfirming function key program Function key assignment confirmation screenSuppressing Effects of Pitching and Rolling Stabilizer How the stabilizer worksStabilizer mark Advanced Sonar Operation Echosounder Mode Choosing the RangeDisplay range and shift concept Adjusting the Gain Sounder menuPicture Advance Speed Measuring DepthMeasuring depth Interference Suppressing InterferenceSuppressing Low Level Noise ClutterErasing Weak Echoes Weak echoesCurve Other Items on the Sounder MenuSounder menu description DraftMarks and Data Marks and Data on the Normal DisplayMarks and data on the normal display Description of marks and data on the normal display Points to North Heading MarkMarks and Data Press the R/B key. Own ship position and trackball mark are Marks and Data on the Echosounder and Audio Displays Marks and data on the echosounder and audio displaysOn the System menu Interpreting the Display Bottom EchoBottom echoes Fish School Fish echoesSea surface reflections Sea Surface ReflectionsWake WakeSidelobe echo False Echo by SidelobeNoise and Interference Noise and interferenceMarks and System Menus Marks MenuMarks menu Marks menu description Dimmer System MenuSystem menu Description of System menu Disp SelectDescription of System menu con’t from previous MAINTENANCE, Troubleshooting General MaintenanceCleaning the Equipment Hull Unit Maintenance Hull unit maintenance pointsLubrication points, zinc plate Manually raising the transducer Hull unitHand crank Unit Fuse Type Code No Fuse ReplacementFan Replacement Type Code NoTroubleshooting Symptom Check, RemedyTransducer not retracted Error MessagesMessage Meaning, Remedy Overvoltage High speedDiagnostic Tests Choosing a diagnostic testDescription of diagnostic tests Single test, Continuous testContinuous test example CSH-5L, 55 kHz transducer Panel test Panel testColor test Color testWhite RED Green Blue Pattern testSIO test SIO testEcho tests Echo testsSpecifications of Color Scanning Sonar CSH-5L/8L Hull Unit Interface This page is intentionally left blank Sounder menu Menu TreeSonar menu AP-1Marks menu System menuAP-2 Index IN-1

CSH-5L/CSH-8L specifications

Furuno CSH-5L and CSH-8L are advanced marine radar systems known for their cutting-edge technology and user-friendly interfaces. Designed primarily for maritime applications, these radar units cater to a wide range of vessels, from commercial ships to fishing boats. The primary distinguishing feature of the CSH-5L and CSH-8L radar systems lies in their ability to provide high-resolution images and precise detection of targets, ensuring navigational safety and operational efficiency on the water.

One of the standout technologies incorporated into both models is the pulse compression technique. This feature significantly enhances target resolution and minimizes blind spots, allowing the radar to detect smaller objects at greater distances. With the CSH-5L and CSH-8L's powerful signal processing capabilities, users can expect exceptional performance even in challenging weather conditions, ensuring reliable operation during storms or fog.

The CSH-5L model operates at a frequency range of 5 GHz, while the CSH-8L uses an 8 GHz frequency. Both radars are equipped with a rotating antenna that provides a wide coverage range, allowing for efficient monitoring of the surrounding marine environment. Their high sensitivity and low noise levels enhance target detection, making them particularly useful for locating small fishing vessels or buoys.

Another important characteristic of the Furuno CSH-5L and CSH-8L is their user-friendly interfaces. Both models feature intuitive controls, allowing operators to adjust settings easily and access critical information quickly. The displays are designed for clarity, enabling users to distinguish between targets and navigate effectively.

Additionally, the radar systems include advanced features such as automatic target tracking and target acquisition capabilities. This functionality allows users to monitor multiple targets simultaneously, providing essential situational awareness for safe navigation. The CSH-5L and CSH-8L also support integration with other onboard systems, including ECDIS (Electronic Chart Display and Information System), which enhances the overall effectiveness of maritime navigation.

In summary, the Furuno CSH-5L and CSH-8L radar systems represent the forefront of marine radar technology, offering exceptional detection capabilities, user-friendly controls, and robust integration options. Their advanced features ensure that mariners can navigate confidently, making them a vital asset for anyone operating in the marine environment.
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