Furuno 841, 821 Suppressing Noise Interference, Off Centering the Display, Selecting Pulselength

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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

15

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Contents Marine Radar First Edition AUG Ground both the Display Unit and the Antenna Unit Safety ArrangementsElectrical Shock Hazard Useable EnvironmentTable of Contents Features ForewordTransceiver Module contained in radome SPECIFICATIONS- ModelAntenna Unit Display UnitWarm-up time Modulator switching method Power supply & power consumptionProtection features VibrationAmbiont temperature Receiver front end MIC Michoeave IC Bandwidth 7 MHz DuplexerInterface Nmea Model 821/841 Page Configuration Model 821/841Principle of Operation How radar works Operation Control DescriptionDisplay Indications and Markers Turning the Radar On OffTransmitting Adjusting LCD Backlighting and Display ToneAdjusting Control Panel Brilliance Selecting the RangeAdjusting GAIN, STC, A/C Rain and FTC STC MAN AutoAdjusting FTC Tuning the ReceiverAdjusting A/C Rain How to tune manuallyMeasuring the Range Measuring the BearingMenu Operation Target on collision course with your vessel?Menu description Selecting the Display Mode 11 Display modesCU course-up Selecting the Presentation ModeWindow Display Guard Alarm WPT-UP waypoint-upSuppressing Radar Interference GuardSelecting Pulselength Suppressing Noise InterferenceOff Centering the Display Echo Trails Navigation Data DisplayEcho Stretch magnifying long range echoes Press the Menu key Select Nav Data and press the ENT keyWatchman Selecting Unit of Measurement for RangeSelecting Bearing Reference Displaying Navigation Data During Stand-by Erasing the Heading MarkerDeselecting Ranges Displaying Cursor Position, Range and Bearing to Cursor Visual Alarm IndicationsOutputting Cursor Position to Navigator Target Properties and Radar Wave Reflection Interpreting the DisplayRadar Wave and Radar Horizon Super-refractionFalse Echoes Bearing ResolutionRange Resolution Multiple echoes Nautical Chart and Radar Picture Blind and shadow sectorsForming any maintenance or Maintenance & TroubleshootingSafety Information Troubleshooting procedurePreventative Maintenance Replacing the FuseTroubleshooting Troubleshooting tableSelf Test Self TestInstallation Antenna Unit InstallationVent tube Removing packing materialsMounting platform How to fasten the radome base To the mounting platform Ships bow Removing packing materials 10 Antenna unit Model 841, inside view, shield cover removed 12 Optional mounting bracket installation for sailboat Display Unit Installation 13 How to mount the display unit 14 Display unit, rear view Option connector ProcedureInstallation Check List Initial Adjustment of Picture Displaying the Installation MenusEntering Initial Settings Relative Bearing AlignmentClosing the Installation Menus Sweep TimingSignal cable connection Page Page Page Page Page Page Page