Furuno CSH-5L/CSH-8L manual Rejecting Sonar Interference and Noise, Identifying noise source

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2. FINE TUNING THE SONAR PICTURE

2.5Rejecting 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.

2.5.1Identifying noise source

To eliminate noise effectively, you should first identify the noise source.

•Turn off “TRANSMISSION” in the SONAR menu to stop transmission and operate all on board equipment one by one while observing the picture.

•Run the boat at various speeds to check if the noise is speed dependent.

If neither of the above two steps affects on the picture, adjust the INT REJECT (Interference Rejector), NOISE LIMITER or TX CYCLE on the SONAR menu as appropriate.

2.5.2Rejecting noise with the interference rejector

This control is similar to the interference rejector on echo sounders and radars. It is effective for rejecting random noise and sea surface reflections in rough sea conditions. Set the interference rejector so that noise is just eliminated. Do not use an unnecessarily high setting since small wanted echoes may also be rejected.

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 INT REJECT.

5.Use the [GAIN] control to set interference rejection level, from 0 (OFF) to 3 (highest degree of suppression).

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

2.5.3Rejecting noise with the noise limiter

Weak, unwanted reflections, colored light blue or green, are displayed when water is contaminated or plankton layers exist or due to ship’s noise.

1.Press the MENU key. The last-used menu appears.

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 NOISE LIMITER.

5.Use the [GAIN] control to set noise limiter level. The setting range is 0-10 and the higher the figure the greater the degree of suppression.

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 Viii System configuration of CSH-8LOperational Overview Control UnitControl unit Remote controller Remote Controller optionBasic Operating Procedure Turning on the powerLowering the transducer Sonar menu TransmittingSystem menu Adjusting backlighting of control unitMode description Description Display Choosing a display modeNorm COMBI-1Sonar display Normal mode display sonar displayCOMBI-1 display sonar display + audio 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 Bottom and tilt angle How to discriminate fish echoes from the bottomCase 1 Tilt angle 30 to 40 degrees Case 2 Tilt angle 10 to 20 degreesPoints to consider Tilt angle for surface fishTilt angle and surface fish example CSH-5L Suitable tilt angle Finding Range and Bearing to a TargetDepth, detection range and tilt angle Location of trackball dataSonar Menu Overview Operating procedureSonar 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 3 2ND AGC Pulse lengthHow to adjust TX output Identifying noise source Rejecting Sonar Interference and NoiseRejecting noise with the interference rejector Rejecting noise with the noise limiterInterference rings Rejecting interference with TX cycleDeleting Weak Echoes Choosing BeamwidthEcho Averaging 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, Own Ship Position Mark How to use the event markEvent mark Entering an event markEntering an own ship position mark Deleting an event markEvent marks Collectively Deleting Marks TrackShip Operating the function keys Function Keys F1-F4Programming for fishing ground or target fish Erase Marks dialog boxUseful programs main items only Programming specific functionTX Output Pulse Length TX Cycle TVG Near TVG FAR HOR Beamwidth Color Curve ResponseFunction key assignment confirmation screen Confirming function key programSuppressing Effects of Pitching and Rolling Stabilizer How the stabilizer worksStabilizer mark Advanced Sonar Operation Echosounder Mode Choosing the RangeDisplay range and shift concept Sounder menu Adjusting the GainPicture Advance Speed Measuring DepthMeasuring depth Suppressing Low Level Noise Suppressing InterferenceInterference ClutterWeak echoes Erasing Weak EchoesSounder menu description Other Items on the Sounder MenuCurve DraftMarks and Data Marks and Data on the Normal DisplayMarks and data on the normal display Points to North Heading Mark Description of marks and data on the normal displayMarks 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 echoes Fish SchoolWake Sea Surface ReflectionsSea surface reflections WakeNoise and Interference False Echo by SidelobeSidelobe echo Noise and interferenceMarks and System Menus Marks MenuMarks menu Marks menu description System menu Description of System menu System MenuDimmer 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 Fan Replacement Fuse ReplacementUnit Fuse Type Code No Type Code NoSymptom Check, Remedy TroubleshootingMessage Meaning, Remedy Overvoltage Error MessagesTransducer not retracted High speedChoosing a diagnostic test Diagnostic TestsDescription of diagnostic tests Single test, Continuous testContinuous test example CSH-5L, 55 kHz transducer Panel test Panel testWhite RED Green Blue Color testColor test Pattern testSIO test SIO testEcho tests Echo testsSpecifications of Color Scanning Sonar CSH-5L/8L Hull Unit Interface This page is intentionally left blank Sonar menu Menu TreeSounder menu AP-1Marks menu System menuAP-2 IN-1 Index

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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