Furuno 1715 manual Suppressing Sea Clutter, Automatic adjustment by the A/C SEA control

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1. OPERATION

Manual gain adjustment

While observing the screen and the gain tuning bar, press ◄ or ► to adjust the gain. The setting range is 0-100.

3. Press the [MENU/ESC] key to finish.

1.8 Suppressing Sea Clutter

Echoes from waves cover the central part of the display with random signals known as sea clutter. The higher the waves, and the higher the scanner above the water, the further the clutter will extend. When sea clutter masks the picture, suppress it by the A/C SEA control.

Automatic adjustment by the A/C SEA control

Sea clutter, as well as rain clutter, can be automatically adjusted with the automatic A/C SEA function.

Manual adjustment of A/C SEA

The A/C SEA control reduces the amplification of echoes at short ranges (where clutter is the greatest) and progressively increases amplification as the range increases, so amplification will be normal at those ranges where there is no sea clutter.

The proper setting of the A/C SEA should be such that the clutter is broken up into small dots, and small targets become distinguishable.

If the setting is set too low, targets will be hidden in the clutter, while if the setting is too high, both sea clutter and targets will disappear from the display. In most cases adjust the control until clutter has disappeared to leeward, but a little is still visible windward.

Note: The auto A/C SEA function can erase weak target echoes. Adjust the control carefully watching the display.

Sea clutter at screen center

1.Press the [GAIN] key consecutively until the display shown below appears.

				A/C SEA

	AUTO	: MODERATE

	MANU				20
					20

[GAIN]		: A/C RAIN MENU

[MENU/ESC] : Exit.

A/C SEA adjustment window

2.Press ▲ or ▼ to choose AUTO or MANU as appropriate.

Automatic A/C SEA adjustment

1)Press ► to open the automatic A/C SEA options window.

ROUGH

MODERATE

CALM

A/C SEA options

2)Press ▲ or ▼ to choose ROUGH, MODERATE or CALM depending on sea conditions.

3)Press ◄ to close the window.

5

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Contents Model Model European Union Important NoticesUSA Other countriesSafety Instructions Compliance with R&TTE Directive 1999/5/EC Table of Contents Foreword FeaturesWord to the Owner of the Model Navigator System ConfigurationDisplay unit installation materials Antenna installation materialsEquipment Lists Standard supplyOperation How to remove the hard coverControls Display unitIndications IndicationsAbout the LCD Brilliance/contrast adjustment window Turning Power On/OffTransmitting, Standby Startup screenAutomatic gain adjustment Adjusting Display Contrast, BrillianceChoosing the Range Receiver SensitivityManual adjustment of A/C SEA Automatic adjustment by the A/C SEA controlManual gain adjustment Automatic A/C SEA adjustmentMeasuring the Range Suppressing Rain ClutterMeasuring range by the range rings Measuring range by the cursorShifting the Display Measuring the BearingMeasuring bearing with the cursor Measuring bearing with the EBLUser Menu Overview ZoomZoom display User menu,Interference Rejector Heading LineUser menu description Appearance of interferenceEcho Trail, Trail Brilliance Noise RejectorEcho Stretch Echo trailsSetting a guard zone Guard AlarmSilencing the audio alarm Canceling the guard zone and guard alarmWatchman Setting watchman stand-by intervalSuppressing Heavy Rain Clutter Panel Backlighting24 Hue Resetting Distance RunProg Key Outputting Target Position to a PlotterTurning Navigation Data On/Off Setting up Nav Data Displays30 00.065N 130 00.574E Nav data displays 21 nm30 00.065N 130 00.574ESystem menu description System Menu1 of system menu Waypoint Mark The waypoint mark shows3 of system menu Maintenance MAINTENANCE, TroubleshootingMaintenance program Period Check point ActionTroubleshooting TroubleshootingReplacing the Fuse If… But… Then…Installation menu DiagnosticsDisplay unit Antenna unitClearing the Memory Test PatternReplacing the Magnetron Replacing the Synchro BeltAntenna Unit Installation InstallationMounting considerations Mounting on a platformAntenna unit, inside view How to fasten the antenna base to platformAntenna cable and gasket to use How to fix the EMI core Mounting using the optional mounting bracketContents of radome mounting assy Connecting antenna cable to antenna unitMounting Display Unit InstallationDesktop, overhead mounting Flush mountingConnecting external equipment WiringWiring Input sentencesConnecting the external buzzer AdjustmentsHeading alignment Display unit, rear viewTiming adjustment Timing adjustment display Nmea port setup, GPS Waas setupMD board Magnetron Heater VoltageTrail Brilliance LOW, High System Menu Menu TreeSP-1 Specifications of Marine RadarSP-2 Environmental ConditionsPage Page Page Page Marine Radar Page 00014790912