Rejecting Radar Interference, Radar interference | Furuno 1734C

2. RADAR OPERATION

2.14 Rejecting 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.

1.5/	.500nm	319.9	° M	PROCESS
	.500nm		° M	SIGNAL
H-UP	SP
H-UP
				I. REJ
				LOW

E. AVG

OFF

PULSE

SHORT

E. STR

LOW

RETURN

+359.9° R 1.40nm

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.

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Furuno 1734C, 1724C manual Rejecting Radar Interference, Radar interference

Contents

Page How to discard this product How to discard a used battery GeneralEuropean Union USA Safety Instructions Table of Contents Plotter Operation 10.4 AIS Operation MAINTENANCE, Troubleshooting Vii Features Foreword NavNet system Model 1724C/1734C NavNet system Model 1724C/1734C External buzzer Two-unit NavNet system Two-unit NavNet system Three-or-more-unit NavNet system Max display units Three-or-more-unit NavNet system Display unit controls Operating ControlsDisplay unit controls Plotter displays Soft keysDisplay unit Key Function Remote controllerKey Inserting a Chart Card Turning the Unit On/Off Brilliance adjustment soft keys Display Brilliance, Panel Brilliance, HueDisplay 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 Switching control in combination and overlay screens Radar source and sounder source windows Selecting image sourceSelect source menu Cursor pad, Cursor Cursor, cursor data MOB mark messages Entering the MOB Mark, Setting MOB as DestinationMOB concept Data Boxes Showing, hiding data boxes with soft keyRearranging data boxes Temporarily erasing a data box Function keys Function Default Setting, Key LabelFunction Keys Radar Simulation setup menuSimulation Display Plotter Sounder This page intentionally left blank Radar Display Radar display Tuning Adjusting the GainTuning window Transmitting, Stand-by Adjusting the FTC Reducing Sea ClutterHow the A/C SEA works Gain sensitivity window Adjusting the A/C SEA SEA setting windowRain setting window Reducing Precipitation Clutter Range scales km Range ScaleRange scales nm, sm Signal process soft keys Pulselength Function Indicator on display Soft key label Presentation ModeSelecting a presentation mode Description of presentation modes Head-upCourse-up North-up How to measure range to a target with the cursor Measuring the RangeMeasuring range by range rings Measuring range by cursor Various VRM operations How to measure range with the VRMMeasuring range by VRM Measuring the Bearing Measuring bearing by cursorMeasuring bearing by EBL Various EBL operations Erasing the Heading Line, North Marker Reducing Noise Interference Rejecting Radar Interference Radar interference Zoom Zooming radar targetsZooming ARP, TTM targets Zoom Shifting the Picture Manual shiftAutomatic shift Target no. selection window Using the Offset EBL Setting automatic shift maximum speedPredicting collision course Automatic shift Measuring range & bearing between two targets Predicting collision course with the offset EBL Echo Trails Trail timeMeasuring range and bearing between two targets Sample echo trails Trail time window Starting echo trailsTrail soft keys Trail color window Trail gradationTrail color Echo Stretch Types of echo stretch Echo Averaging Effect of echo averaging Outputting TLL Data Target soft keys How to set a guard alarm zone Guard AlarmSetting a guard alarm zone When the alarm is violated… Cancelling the guard alarmWatchman How watchman works Watchman time window Setting watchman stand-by intervalTurning on/off watchman Waypoint Marker Waypoint marker Usage precautions for ARP 25 ARP, TTM Operation ARP setup menu Activating/deactivating ARP, TTMAcquiring and tracking targets ARP ARP Target Info window Automatic acquisition area window ARP plot symbolsAutomatic acquisition Displaying target number ARP, TTM Terminating tracking of ARP targetsARP target number Terminating tracking of selected targets Vector reference, vector time Setting vector attributes ARPWhat is a vector? History interval window Displaying past position ARPPast position displays 25.7 ARP, TTM target data ARP target data Tcpa time 25.8 CPA/TCPA alarm ARPCPA distance Lost target mark Lost target alarm ARPCanceling a lost target Interpreting the Radar Display False echoesMultiple echoes Sidelobe echoes Shadow sector Appearance of Sart signal on the radar displaySart Search and Rescue Transponder Racon Radar Beacon General procedure for detecting Sart responseAppearance of racon signal on the radar display This page is intentionally left blank Plotter Displays Full-screen plotter displayFull-screen plotter display Nav data window Contents of nav data window Plotter Operation Compass display Nav graphic displayCompass display Reading the XTE cross-track error monitor XTE range setting window Anemometer display Anemometer display Highway display Highway display Nav data display Nav data displays Auto course-up Perspective C-map onlyNorth-up Course-up Chart Scale Chart CardsChart card overview Shifting the Display When a chart cannot be displayed Indices and chart enlargementSample chart Japan, showing indices Navionics charts Port service iconsPlotter display, showing port service display Data for aids to navigation Current or tide data Current data displayObject information Object information window Find window MAP charts Cursor and data displayObjects window Example of caution area window Sample lighthouse data Lighthouse iconObject windows Tide window Map, port service displayTide information Port service icons Working with Track Displaying trackOwn ship track Track control menu Stopping, restarting plotting of own ship track Changing track color Track plotting method and interval for own ship track Own ship’s trackOwn ship track color window Track plotting method Changing own ship track/mark distribution setting Interval windowTrack plotting interval Interval windows Erasing track Track memory windowErasing own ship track by area Erase menu Erasing own ship track by color Erase track by color windowErasing all own ship track Erasing all target tracks Marks, Lines Entering a mark, lineChanging mark attributes Marks & lines menu Lines style window Selecting line typeMarks shape window Erasing marks, lines Erasing an individual markErasing an individual line Erasing marks, lines by area Waypoints Entering waypointsEntering a waypoint at own ship position Entering a waypoint with the cursor Waypoint mark shape selection window Waypoint mark color selection window Entering a waypoint by range and bearing Entering a waypoint from the waypoint list Editing waypoint data from the waypoint list Editing waypoint dataAlphanumeric and local waypoint lists Editing a waypoint from the plotter display Plotter display Erasing waypoints Erasing a waypoint directly from the plotter displayErasing a waypoint from the menu Erasing a waypoint from the waypoint list Chart details menu Changing waypoint mark size Navionics Gold Searching waypoints Alphanumeric list Routes Creating routesEntering a route with existing waypoints Route menu Entering a route with the cursor Creating voyage-based routes Displays for entry of time, distance interval Save route menuSave route window Connecting routes Connect route window Inserting waypoints Inserting a waypoint from the route listEdit route menu Waypoint list for editing a Route local list Removing waypoints from a route Inserting a waypoint from the plotter displayRemoving a waypoint from the route list Removing a waypoint from the plotter display Navigation Erasing routesNavigating to a quick point Selecting quick point entry method Navigating to waypoints Navigating to a single quick pointNavigating to multiple quick points Selecting a waypoint from the plotter display QP window Navigating to ports, port servicesSelecting an external waypoint Port services and sample port list Ex. NavChart Select Service Following a route Selecting the route to followPlotter display, route selected as destination Navigating waypoints in reverse order Log display Example of when to restart navigationRestarting navigation Setting speed for ETA calculation Switching waypointsAutomatic waypoint switching methods Select speed for ETA window On the plotter display Canceling route navigationThrough the menu Alarms Plotter alarm menu Arrival alarm window Arrival alarmHow the arrival alarm works Anchor watch alarm window Anchor watch alarmHow the anchor watch alarm works XTE Cross-Track Error alarm Speed alarmHow the XTE alarm works XTE alarm window Proximity alarm Trip alarmProximity alarm window Trip alarm window Grounding alarm C-MAP specification Grounding alarm window Alarm information Plotter alarm menu, Message Meaning Alarm messagesPlotter alarm messages and their meanings Resetting Trip Distance General setup menu, This page intentionally left blank Selecting a sounder display Display mode windowSounder Displays Description of sounder displays Single-frequency displayIndications on the single frequency display Dual-frequency display Marker-zoom display plus normal sounder display Sounding area and transmission frequencyMarker-zoom display Bottom-zoom display Bottom-zoom display plus normal sounder displayBottom-lock display Bottom-lock display plus normal sounder display Bottom discrimination display Bottom discrimination displayScope display display only Scope display Automatic Sounder Operation Selecting screen split method in combination displaysHow the automatic sounder works Types of automatic sounder modes How to enable automatic sounder operation Selecting the manual modeManual Sounder Operation Selecting display range Adjusting the gain Shifting the rangeExamples of proper and improper gain Gain window How to measure depth and time Measuring Depth, TimeReducing Interference Types of interference Reducing Low Level Noise Noise limiter windowAppearance of clutter Clutter window Appearance of weak echoes Signal level windowErasing Weak Echoes Color bar 16 color when white marker function is active White MarkerPicture Advance Speed Advancement independent of ship’s speed Picture advance window How the speed-dependent picture advance mode worksAdvancement synchronized with ship’s speed Hue No Echo Color Background Color Display ColorsHue no. and background and echo colors Alarm audio window Audio alarm on/offSounder alarm menu Bottom alarm Fish alarmBottom alarm window Fish alarm window Fish alarm B/L Water temperature alarmFish alarm B/L window Water temperature alarm window When an alarm setting is violated Fish Alarm Changing Pulse Repetition Rate Water Temperature GraphSounder alarm messages and their meanings Saving Sounder Picture to an SD Card Interpreting the Sounder DisplayZero line Zero line Bottom echo Bottom echoes Fish school echoes Surface noise/AerationFish school echoes Surface noise/aeration Turning AIS Feature On/Off AIS Option menu AIS Display Mode window Vector mode AIS Symbols Setting Number of AIS Targets to DisplayAIS symbols Symbol Description Activating Targets AIS target data display Setting CPA and Tcpa Lost TargetLost target Confirming a lost target Tcpa window Proximity AlarmCPA window AIS vector time window Showing, Hiding AIS Target TracksChoosing Vector Time Displaying Past Positions of AIS Targets AIS past position displays Save data menu Deleting all data from memory cards other than chart dataMemory Card Operations Saving data to a memory card Memory card messagesMemory card messages Message Reason Remedy Playing back data from a memory card Load data menu Setting communication software on the PC Uploading, Downloading DataUploading or downloading data Upload and download menus Baud rate window Waypoint data formatWaypoint data format Characters available for comment End of sentence Route data menuRoute comment data format Mark data format Loading Waypoint Data from YeomanMark data menu Receiving Data Via Network Equipment Receive data menuHost name window Marks & lines window Outputting Data Through the Network Select sentence menu This page intentionally left blank General Setup General setup menu Contents of general setup menu Contents of general setup menu con’t from previous Radar display setup menu Radar SetupRadar display setup Contents of radar display setup menu Con’t on next Contents of radar display setup menu con’t from previous Model Maximum Range Radar range setupRadar range setup menu Function key setup Function Key Default FunctionRadar function key menu Radar function key options Radar function keys Menu Item Function Function Key Label Navigation options Plotter SetupPlotter setup menu Contents of plotter setup menu Function Default Function Function Key Label Plotter function key menu Plotter function key options Scroll Plotter function keys Plotter display, chart offset selected Chart SetupChart offset Navionics Gold chart attributes MAP chart attributes Displaying the Chart Configuration menuChart configuration menu C-MAP Contour Line Soft key Object Content Settings Description Chart Configuration menu descriptionChart Configuration menu description Chart Configuration menu description con’t from previous Object Content Setting Description Safety Status Indication Normal or U.ZOOM or O.ZOOM Depth Config soft key Depth Config menuDepth Config menu description Setting Description Default Setting Setting Setting Range Default Setting Contours, depth data, etc Data Boxes Setup Data box menu Combination screen selection window Hot Page SetupHot page setup menu Navigator Setup Navigation data source Contents of nav setup menu Furuno BB GPS receiver setup GPS setup menu Contents of GPS setup menu Contents of GPS setup menu con’t on previous GPS Status TD setup menu TD display setupContents of Waas Setup menu Loran C GRI & station pair window Displaying Loran C TDsLoran GRI & station pair window Displaying Decca TDs Decca chain and station pair window Nav data setup window Nav Data Display SetupNav data setup screen Sounder system setup menu Sounder SetupSystem setup Sounder system setup menu description HF,LF Target Sensor setup Sensor setup menuSensor setup menu settings Settings Default Setting Sounder range setup menu Default basic rangesSounding range, zoom range, bottom lock range Zoom range and bottom-lock ranges Function key setting Function key label Sounder function key menu Sounder function keys Nav Graphic Display Setup NAV Graphic menuGraphic meter window Depth graph up-date window Check point Remedy Preventive MaintenanceMaintenance program Replacement of Batteries Replacement of FuseBattery on circuit board Batteries in remote controller Simple Troubleshooting General troubleshootingReplacing the Magnetron Radar model and magnetron used Radar troubleshooting Plotter troubleshootingRadar Plotter If… But… Then… Sounder troubleshootingSounder Memory I/O Test menu DiagnosticsMemory I/O test GPS receiver test results Display unit testGPS sensor test Requires a Furuno BB GPS receiver Test pattern Network sounder test results Test pattern sequence Keyboard, remote controller test Screen for testing keyboard, remote controller About the GPS status display GPS Status DisplayGPS status display Windows for clearing memory Clearing MemoriesMemory clear menu Error Message Meaning Remedy General Error MessagesError messages This page is intentionally left blank Menu Overview AP-1 AP-2 Appendix Setup AP-3 NAV Graphic Display Setup AP-4 AP-5 PURPLE, BLUE, White Interval TIME, Distance Chart Details MAP AP-6 AP-7 AP-8 Zoom Marker ON, OFF HUE Alarm key Radar AlarmsPlotter Alarms Sounder Alarms Geodetic Chart List AP-10 Icon Meaning IconsAP-11 AP-12 This page is intentionally left blank Model 1724C/1734C SP-1 Transceiver Module Plotter Function Coating Color Specifications of Video Plotter GD-1720C This page is intentionally left blank Index IN-1 IN-2 GPS sensor test Furuno BB IN-3 Messages Satellite disable Furuno BB IN-4 Shape Switching in route navigation IN-5