Rejecting Radar Interference, Radar interference | Furuno 1823C

2. RADAR OPERATION

2.14Rejecting Radar Interference

Radar interference may occur when near another shipborne radar that is operating in the same frequency band as your radar. Its on-screen appearance looks like many bright dots either scattered at random or in the form of dotted lines extending from the center to the edge of the display. Interference effects are distinguishable from normal echoes because they do not appear in the same place on successive rotations of the scanner.

Be sure to turn off the interference rejector when no interference exists – weak targets may be missed.

Radar interference

1.If not displayed, press the [HIDE/SHOW] key to show the radar soft keys.

2.Press the SIGNAL PROC. soft key.

12/LP 3nm

H-UP

319.9° M SIGNAL

PROCESS

I.REJ

OFF

	E. AVG	Shown when radar
	OFF	Shown when radar
	OFF	source is the Model
		source is the Model
	PULSE	1800/1900 series
	E. STR	radar. Not shown
	E. STR	otherwise.
	OFF	otherwise.
	OFF

RETURN

+359.9 ˚R

11.70nm

SIGNAL PROCESS soft keys

3.Press the I. REJ soft key successively to choose the interference rejection level desired; LOW, MED, HIGH or OFF.

4.Press the RETURN soft key to finish.

The display shows IR L (Low), IR M (Medium) or IR H (High) when the interference rejector is on.

2-17

Image 53

Furuno 1823C manual Rejecting Radar Interference, Radar interference

Contents

Back 00080919804 Safety Instructions Compliance with R&TTE Directive 1999/5/EC Table of Contents Page Plotter Operation Video Sounder Operation Customizing Your Unit Vii Data Transfer Viii Foreword Model Output Range Radar Features NavNet system Model 1823C/1833C/1933C/1943C/1953C NavNet system Model 1823C/1833C/1933C/1943C/1953C Single-unit NavNet system GD-1900C XiiSingle-unit NavNet system GD-1900C Two-unit NavNet system XiiiTwo-unit NavNet system Three-or-more-unit NavNet system Xiv What is WAAS? Operational Overview Display unit controls Operating ControlsOverview of display unit controls Control unit Radar and plotter displays Soft keysDisplay unit Key Function Remote controller Display unit Memory card interface unit Option Inserting a Chart CardChart card and card remover Startup sequence Turning the Unit On/Off Display Brilliance, Panel Brilliance, Hue Brilliance adjustment soft keysDisplay brilliance, panel brilliance Display brilliance and panel brilliance windows Night Day Twilight 2 HueHue window Display screens Selecting a DisplayDisplay modes Radar combination screen selection window Selecting a displayDisplay screen selection window To adjust Sounder Plotter Switching control in combination and overlay screens Radar source and sounder source windows Selecting image sourceSelect source menu Cursor, cursor data Trackball, Cursor MOB mark messages Entering the MOB Mark, Setting MOB as DestinationMOB concept Data boxes Data BoxesShowing, hiding data boxes with soft key Temporarily erasing a data box Rearranging data boxes Function Keys Function Default Setting, Key LabelExecuting a function Function keys Simulation Display Simulation setup menu Plotter RadarNavNet display unit-generated echoes Sounder Radar display Radar Display Adjusting the Gain TuningTuning window Transmitting, Stand-by Gain sensitivity window Gain adjustment soft keys SEA setting window Adjusting the A/C SEAReducing Sea Clutter How the A/C SEA works Reducing Precipitation Clutter Adjusting the A/C RainRain setting window Range scales km Range ScaleRange scales nm, sm Pulselength Signal process soft keys Radar display soft keys Presentation ModeSelecting a presentation mode Course-up presentation mode Head-up presentation modeDescription of presentation modes Head-up True motion presentation mode North-up presentation modeNorth-up True motion Measuring range by range rings Measuring the Range Measuring range by cursor How to measure range to a target with the cursor EBL/VRM soft keys Measuring range by VRM Measuring the Bearing Erasing an EBL, EBL indication How to measure bearing with the EBL Reducing Noise Interference Erasing the Heading Line, North Marker Radar interference Rejecting Radar Interference Zooming in on radar targets ZoomZooming in on ARP, TTM targets Zoom Manual shift Shifting the PictureTarget no. selection window Shifting the picture manually Auto ship speed setting window Setting automatic shift maximum speedAutomatic shift Automatic shift Predicting collision course with the offset EBL Using the Offset EBLPredicting collision course Measuring range and bearing between two targets Measuring range & bearing between two targets Trail time Echo TrailsSample echo trails Trail soft keys Multitone and monotone trails Starting echo trailsTrail gradation Trail mode window Echo trail modeTrail color Trail color window Types of echo stretch Echo Stretch Effect of echo averaging Echo Averaging Target soft keys Outputting TLL Data How to set a guard alarm zone Guard AlarmSetting a guard alarm zone Cancelling the guard alarm When the alarm is violated… Watchman Setting watchman stand-by intervalHow watchman works Turning on/off watchman Second-trace echoes Suppressing Second-trace Echoes Waypoint marker Waypoint Marker 26 ARP, TTM Operation Usage precautions for ARP ARP target info window ARP setup menuActivating/deactivating ARP, TTM Acquiring and tracking targets ARP ARP plot symbolsManual acquisition Automatic acquisition ARP target number Displaying target number ARP, TTMAutomatic acquisition area Terminating tracking of ARP targets Cancel all targets windowTerminating tracking of selected targets Terminating tracking of all targets Vector reference, vector time Setting vector attributes ARPWhat is a vector? History interval window Displaying past position ARPPast position displays ARP target data 26.7 ARP, TTM target data CPA window 26.8 CPA/TCPA alarm ARP Canceling a lost target Lost target alarm ARPTcpa window Lost target mark Minimum and maximum ranges Interpreting the Radar DisplayGeneral Bearing resolution Radar resolutionRange resolution Bearing accuracy Multiple echoes False echoesMultiple echoes Sidelobe echoes Virtual image Virtual imageShadow sectors Shadow sectors Sart Search and Rescue Transponder Appearance of Sart signal on the radar display General remarks on receiving Sart General procedure for detecting Sart response Racon Radar Beacon Appearance of racon signal on the radar displaySEA control Rain control Full-screen plotter display Plotter DisplaysFull-screen plotter display Nav data window Contents of nav data window Compass display Compass display XTE range setting window Reading the XTE cross-track error monitorSetting the range for the XTE monitor Highway display Highway display Nav data displays Nav data display North-up Plotter display, north-up mode Course-up Plotter display, auto course-up modeAuto course-up Plotter display, course-up mode, destination set Shifting the Display Chart ScaleCharts scales Chart icons and their meanings Chart CardsChart card overview When a chart cannot be displayed Indices and chart enlargementSample chart Japan, showing indices Data for aids to navigation Furuno and NavCharts chartsChart symbols Plotter display, showing port service display Port service iconsCurrent or tide data Current data display Cursor and data display MAP chartsObjects window Example of caution area window Object windows Icon dataLighthouse icon Tide information Sample lighthouse data Date window Map, port service displayTide window Displaying track Working with TrackOwn ship track Track control menu Target track Stopping, restarting plotting of own ship track Own ship track color window Changing track colorOwn ship’s track Track plotting method Track plotting method and interval for own ship trackInterval window Track plotting interval Track memory window Changing own ship track/mark distribution setting Erase menu Erasing trackErasing own ship track by area Erase track by color window Erasing own ship track by colorErasing all own ship track Erasing all target tracks Entering a mark, line Marks, LinesChanging mark attributes Marks & lines menu Lines style window Selecting line typeMarks shape window Erasing an individual mark Erasing marks, linesErasing an individual line Erasing marks, lines by area Entering waypoints WaypointsEntering a waypoint at own ship position Entering a waypoint with the cursor Waypoint mark color selection window Waypoint mark shape selection window Entering a waypoint by range and bearing Entering a waypoint from the waypoint list Editing waypoint dataAlphanumeric and local waypoint lists Editing waypoint data from the waypoint list Plotter display Editing a waypoint from the plotter display Erasing a waypoint directly from the plotter display Erasing waypointsErasing a waypoint from the menu Erasing a waypoint from the waypoint list Chart details menu Changing waypoint mark size FURUNO, NavCharts Alphanumeric list Searching waypoints Creating routes RoutesEntering a route with existing waypoints Route menu Entering a route with the cursor New route entry screen Save route window Creating voyage-based routesSave route menu To stop recording waypoints and save the route Displays for entry of time, distance intervalFor manual entry of waypoints, do the following Connect route window Connecting routes Inserting a waypoint from the route list Inserting waypointsEdit route menu Waypoint list for editing a route local list Inserting a waypoint in an intermediate location on a route Inserting a waypoint from the plotter display Erasing routes Removing waypoints from a routeRemoving a waypoint from the route list Removing a waypoint from the plotter display Navigating to a quick point NavigationSelecting quick point entry method Go to method window Navigating to multiple quick points Navigating to waypointsSelecting a waypoint from the plotter display Selecting a waypoint from the waypoint list QP window Navigating to ports, port services NavCharts/C-MAPSelecting an external waypoint Sample filling station locations southern Italy Port services and sample port list Selecting the route to follow Following a routePlotter display, route selected as destination Navigating waypoints in reverse order Log display Example of when to restart navigationRestarting navigation Switching waypoints Setting speed for ETA calculationAutomatic waypoint switching methods Select speed for ETA window Canceling route navigation Audio alarm on/off AlarmsPlotter alarm menu Audio alarm window Arrival alarm window Arrival alarmHow the arrival alarm works Anchor watch alarm window Anchor watch alarmHow the anchor watch alarm works Speed alarm XTE Cross-Track Error alarmHow the XTE alarm works XTE alarm window Proximity mark Proximity alarmProximity alarm window Trip alarm window Trip alarm Plotter alarm menu, Alarm information Message Meaning Alarm messagesPlotter alarm messages and their meanings General setup menu, Resetting Trip Distance Underwater conditions and video sounder display Principle of Operation Selecting a sounder display Display mode windowSounder Displays Single-frequency display Description of sounder displaysIndications on the single frequency display Selecting transmission frequency Dual-frequency display LF picture Dual-frequency displayHF picture Sounding area and transmission frequency Bottom-zoom display plus normal sounder display Marker-zoom display plus normal sounder displayBottom-zoom display Bottom-lock display plus normal sounder display Bottom-lock display Bottom discrimination display Bottom discrimination displayScope display display only Scope display Selecting screen split method in combination displays How to use the Split soft key example dual frequency display Automatic Sounder Operation How to enable automatic sounder operationHow the automatic sounder works Types of automatic sounder modes Adjusting the gain Selecting the manual modeManual Sounder Operation Selecting display range Shift concept Shifting the rangeGain window Measuring Depth, Time How to measure depth and time Noise limiter window Reducing InterferenceTypes of interference Clutter window Reducing Low Level NoiseAppearance of clutter Appearance of weak echoes Signal level windowErasing Weak Echoes White marker window Color bar 16 color when white marker function is activeWhite Marker Picture advance window Picture Advance SpeedAdvancement independent of ship’s speed Advancement synchronized with ship’s speed How the speed-dependent picture advance mode works Hue No Echo Color Background Color Display ColorsHue no. and background and echo colors Alarm audio window Sounder alarm menu Fish alarm Bottom alarmBottom alarm window Fish alarm window Fish alarm B/L window Fish alarm B/L Water temperature alarm window Water temperature alarm Alarm information window When an alarm setting is violated Sounder alarm messages and their meanings Water Temperature Graph Changing Pulse Repetition Rate Zero line Interpreting the Sounder DisplayBottom echo Zero line Surface noise/Aeration Fish school echoesFish school echoes Surface noise/aeration General setup menu General Setup On next Contents of general setup menu Radar display setup Radar SetupContents of general setup menu con’t from previous Radar display setup menu Con’t on next Contents of radar display setup menu Contents of radar display setup menu con’t from previous Model Maximum Range Radar range setupRadar range setup menu Function Key Default Function Function Key Label Function key setupRadar function key menu Radar function key options Menu Item Function Function Key Radar function keys Navigation options Plotter SetupPlotter setup menu Contents of plotter setup menu Plotter function key options Function Default Function Function Key LabelPlotter function key menu Plotter function keys Plotter display, chart offset selected Chart SetupChart offset Chart details menu FURUNO, NavCharts FURUNO, NavCharts chart attributes Contents of chart details menu FURUNO, NavCharts Contour line menu FURUNO, NavCharts MAP chart attributesChart details menu C-MAP Cntour Line soft key Contents of chart details menu C-MAP Depth Info soft key Settings description Data box menu Data Boxes Setup Hot page setup menu Hot Page Setup HOT Hot page setup menu, Split X 3 screen, sub screen selection Navigation data source Navigator SetupContents of nav setup menu GPS setup menu Contents of GPS setup menu GPS receiver setup Set equipped with GP-310B/320B Contents of GPS setup menu con’t from previous Status Contents of Waas Setup menu Waas Setup TD setup menu TD display setupDisplaying Loran C TDs Loran GRI & station pair window Decca chain and station pair window Displaying Decca TDs Nav data setup window Nav Data Display SetupNav data setup screen System setup Sounder SetupSounder system setup menu Sounder system setup menu description SM1-SM4, OFF Sounder system setup menu description con’t from previous Sensor setup menu settings Sensor setupSensor setup menu Default basic ranges Sounder range setup menuSounding range, zoom range, bottom lock range Zoom range and bottom-lock ranges Sounder function key options Function Default Function Function KeySounder function key menu Sounder function keys Save data menu Memory Card OperationsFormatting memory cards Saving data to a memory card Message Reason Remedy Memory card messagesMemory card messages Load data menu Playing back data from a memory card Uploading, Downloading Data Setting communication software on the PCUploading or downloading data Upload and download menus Waypoint data format Baud rate windowWaypoint data format Characters available for comment End of sentence Route data menuRoute comment data format Loading Waypoint Data from Yeoman Receive data menu Receiving Data Via Network EquipmentHost name window Marks & lines window Select sentence menu Outputting Data Through the Network Check point Remedy Preventive MaintenanceMaintenance program Replacement of Fuse Replacement of BatteriesBattery on circuit board Batteries in remote controller Replacement the Synchro Belt 1823C only Replacement the MagnetronTrackball Maintenance Part Type Code No Retainer ring and ball MU3721 000-144-645 General troubleshooting Simple TroubleshootingRadar troubleshooting Radar Plotter Plotter troubleshooting Sounder Sounder troubleshooting Memory I/O Test menu DiagnosticsMemory I/O test Display unit test results Display unit testGPS sensor test Requires GPS Receiver GP-310B/320B GPS receiver test results ARP test results Network sounder test results Test pattern sequence Test pattern Screen for testing keyboard, remote controller Keyboard, remote controller test GPS status display GPS Status Display Windows for clearing memory Clearing MemoriesMemory clear menu Error Message Meaning Remedy Error MessagesError messages Menu key Menu Overview Appendix System Port 4800 Chart Setup Menu Plotter Setup Speed Speed for ETA, 0-99 kt, GPS or manual input Temperature Graph ON, OFF PRR Level 0-20, SPD Sensing PRR Radar Alarms Alarm keyPlotter Alarms Sounder Alarms Geodetic Chart List World Time Chart Icons Correct chart and suitable scale full chart reliabilityNorth marker. Points to North Icon Meaning Specifications of Marine Radar Model 1800C/1900C Series Transceiver Module Display Unit Plotter Function Environmental Condition Specifications of Video Plotter GD-1900C IPX5 This page is intentionally left blank Index-1 Index Index Index-2 Navigation Index-3 Index-4 Presentation mode Track Halt soft key Track Resume soft key Trackball Index-5Page