Icom EX-2714, MR-1000TTM, MR-1000RTM Multiple echoes, Minimum range, Basic Radar Theory

Page 26

8 BASIC RADAR THEORY

■Multiple echoes

Multiple echoes may appear when a short-range and strong echo is received from a ship, bridge, or break- water.

Own ship

Another ship

Multiple echoes will appear beyond the target’s true echo point on the same bearing of a large target. They can be reduced with proper adjustment of the

[SEA]/[	] control.
See p. 10 for the [SEA]/[		] control.

False echoes

True echo

■Minimum range

Detection at short range is very important. Minimum range is determined primarily by transmitter pulse length, vertical beam width and height of the scanner unit. The shorter the transmission time, the quicker the return echoes can be received and their distance mea- sured.

The ability to see targets very close to the ship is de- creased if the scanner is mounted too high off the water, because the bottom of the vertical beam of the scanner cuts off nearby targets.

Vertical beam width

This target can not be recognized with radar. Pulse length

Pulse starting point

The target in this area can not be recognized.

22

Image 26

Contents MR-1000R EX-2780Open array type unit Qty Model Name CRT Display Scanner UnitEX-2714Radome type unit Qty System cable OPC-1188 15 m SX-2713/277910 inch CRT display unitRine Radar Word DefinitionTable of Contents Radiation Hazard Panel Description Front panel0PARALLEL Index Line Function PI 9EBL1 VRM1 Switch EBL1 VRM1@0DISPLAY Brilliance Switch Brill 2HEADING Line OFF Function HL OFF@9MODE Indicator Screen$8OWN Ship Vector Indicator #9CURSOR Indicator$3HEADING Indicator 6TIME Indicator %7TIME IndicatorMenu ATA Automatic Tracking Aid Checklist Checking the installationTurning power ON/OFF Basic OperationBasic operation OFF Center function Rain functionSEA function Zoom function IR functionStretch function Zoom function expands the target to two times normal sizePower save function Trails functionPosition indication Bearing settingShip speed indication Waypoint indicationDistance and Direction Measurements Using the ﬁxed ringsUsing the variable range marker Distance measurementDistance and Direction Measurements Using the EBL and VRMBearing and Distance measurement Push EBL1 VRM1/ to clear EBL1 and VRM1Push EBL2 VRM2/ to display the EBL2 and VRM2 Advanced measurementsMeasuring the distance and direction between 2 targets Push Ù Ú Ω ≈ to move the cursor on the other targetZone alarm setting Alarm FunctionAlarm zone setting Setting and using the alarm functionATA menu setting ATA Automatic Tracking AidATA Automatic Tracking Aid ATA operationPlotting marks Course and speed vector Plots ATAIndirect echoes Basic Radar TheorySide-lobe echoes Basic Radar Theory Multiple echoesMinimum range Direction resolution Target resolutionDistance resolution Blind and Shadow sectorsPower source requirement Installation and ConnectionsConnecting the units Ground connectionInstalling the display unit Mounting the EX-2714 scanner unit Ship’s bow directionConnect the system cable Wiring the EX-2714 system cableScanner unit disassembly Mounting the EX-2780 scanner unit Wiring the EX-2780 system cable Fixing the EX-2780 scanner unit BeaconAntenna rotation speed All resetOther Functions Test pattern indicationSelect the language Service MAN MenuService man menu Service MAN Menu Timing adjustmentHDG adjustment SPD adjustment Range selectionMessage Condition Error MessageError message list Scanner unit maintenance MaintenancePeriodic maintenance Display unit maintenanceEX-2780 Open array SpecificationsEX-2714 Radome Specifications Display unitExternal Data List Bearing Speed PositionSX-2713/2779 Display mounting bracket template EX-2714 Radome template EX-2780 Open array type template