Furuno 841 MARK-2 manual Suppressing Noise Interference, Off Centering the Display

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corner on the display when the interference rejection circuit is turned on.

2.18Suppressing Noise Interference

Noise interference appears on the screen as many bright dots. These dots can be sup- pressed by turning on the noise rejector. Note however that there are some forms of noise interference which this radar cannot sup- press.

Procedure

1)Press the [MENU] key.

2)Select P/L & Int/Noise Rej & ES and press the [ENT] key.

3)Select Noise Reject to ON.

4)Press the [ENT] key followed by the [MENU] key.

2.20 Off Centering the Display

Your vessel’s position can be shifted any- where within 75% of the effective display area. The primary advantage of the off cen- tered display is that for any range setting, the view ahead of your vessel can be ex- tended without changing the range or size of targets.

Procedure

1)Locate the cursor where you want to the screen center to be.

2)Press the [OFF CENTER] key.

OFF CENTER appears at the top left corner on the display when the display is off cen- tered.

Note: The off centered display is automatically canceled when the [DISP MODE] key is pressed.

2.19 Selecting Pulselength

Pulselength is the transmission time of a single radar pulse. The longer the pulselength the greater the detection range capability, however range accuracy and range resolution are reduced.

Pulselength can be selected to short or long on the 1.5 and 3 nautical mile ranges.

1)Press the [MENU] key.

2)Select P/L & Int/Noise Rej & ES and press the [ENT] key.

3)Select Pulselength to SHORT or LONG

6)Press [ENT] and [MENU] key.

Cursor

Cursor

(1) Place cursor

(2) Press [OFF CENTER]

where desired.

key; cursor location

 

becomes screen center.

Figure 2-16 Off centering the display

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Contents Marine Radar B . N o . O M E 3 4 4 4 Safety Instructions Do not operate the equipment with wet hands Do not open the equipmentStay away from transmitting antenna Do not disassemble or modify the equipmentUse the correct fuse IiiTable of Contents Foreword FeaturesDisplay Unit SpecificationsAntenna Unit Transceiver Module contained in radomeInterface Nmea Complete Set Installation Materials CP03-15xxAccessories FP03-05900 Equipment ListOptional Equipment Model 841 MARK-2 ConfigurationPrinciple of Operation How radar works Control Description Operation675NM 220.9R 0.646NM 308.7R Display Indications and MarkersTurning the Radar On and Off 5NMSelecting the Range Adjusting LCD Backlighting and Display ToneAdjusting Control Panel Brilliance TransmittingAdjusting GAIN, STC, A/C Rain and FTC General procedureSTC MAN Auto How to tune manually Tuning the ReceiverAdjusting A/C Rain Adjusting FTCMeasuring the Bearing Measuring the RangeMenu Operation Press the Menu key to open the menu. The main menu appearsSee the table on the next Menu Function Menu description11 Display modes Selecting the Display Mode CU course-up Selecting the Presentation Mode Window Display Course-up, you may select CU or WPT- UP, on the menuWPT-UP waypoint-up Guard AlarmSetting the guard zone Silencing the audible alarmSuppressing Radar Interference Canceling the guard zoneSuppressing Noise Interference Off Centering the DisplaySelecting Pulselength Navigation Data Display Echo TrailsTurning echo stretch on or off Setting up the nav data displayEcho Stretch magnifying long range echoes Press the Menu key Select Nav Data and press the ENT keyTurning on watchman Selecting Unit of Measurement for RangeSelecting Bearing Reference WatchmanDisplaying Navigation Data During Stand-by Canceling watchmanErasing the Heading Marker Deselecting RangesDisplaying Cursor Position, Range and Bearing to Cursor Visual Alarm IndicationsError Visual alarm Outputting Cursor Position to NavigatorSuper-refraction Interpreting the DisplayRadar Wave and Radar Horizon Target Properties and Radar Wave ReflectionMultiple echoes Bearing ResolutionRange Resolution False EchoesIndirect echoes Side-lobe echoesNautical Chart and Radar Picture Safety Information Maintenance & TroubleshootingPreventative Maintenance Replacing the FusePeriod Check point Remarks But Then TroubleshootingSelf Test Self TestAntenna Unit Installation Siting, handling considerationsMounting Parallel with the fore and aft line Holes for antenna unitMounting considerations Display Unit InstallationDisplay unit is designed to be mounted on a tabletop Mounting procedureConnections Signal cable connectionHeading Sensor Connection To connect external equipment to the OP- Tion connectorFor E/S Navigation aid, video sounder connectionRadar Installation Check ListInitial Adjustment of Picture Displaying the Installation MenusFollow the procedure below to obtain proper radar picture Entering Initial Settings Relative Bearing AlignmentSweep Timing Press the Menu key and turn off the power Closing the Installation MenusPage Page Page Page Page Page