Furuno 841 MARK-2 manual Antenna Unit Installation, Siting, handling considerations, Mounting

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5. INSTALLATION

This chapter provides the procedures neces- sary for installation. Installation mainly con- sists of the following:

Ásiting and mounting the display unit and antenna unit

Áconnection of the signal cable and the power cable

Áestablishing the ground

Áchecking the installation, and

Áadjustments.

5.1 Antenna Unit Installation

Siting, handling considerations

ÁThe antenna unit is generally installed either on top of the wheelhouse or on the radar mast on a suitable platform. Locate the antenna unit where there is a good all-round view rig- ging intercepting the scanning beam. Any obstruction will cause shadow and blind sec- tors. A mast for instance, with a diameter considerably less than the width of the radicator, will cause only a small blind sec- tor, but a horizontal spreader or crosstrees in the same horizontal plane as the antenna unit would be a much more serious obstruction; you would need to place the antenna unit well above or below it.

ÁIt is rarely possible to place the antenna unit where a completely clear view in all direc- tion is available. Thus, you should determine the angular width and relative bearing of any shadow sectors for their influence on the ra- dar at the first opportunity after fitting. (The method of determining blind and shadow sectors appears later in this chapter.)

ÁIf you have a radio direction finder on your boat, local its antenna clear of the antenna unit, to prevent interference to the direction finder. A separation of more than two meters is recommended.

ÁTo lessen the chance of picking up electrical interference, avoid where possible routing the signal cable near other onboard electri- cal equipment. Also avoid running the cable in parallel with power cables.

ÁThe compass safe distance should be ob- served to prevent deviation of the magnetic compass.

Standard compass

Steering compass

 

 

0.9 m

0.7 m

 

 

ÁDo not paint the radome to ensure proper emission of the radar waves.

ÁWhen this radar is to be installed on larger vessels, consider the following points:

(1)The signal cable run between the antenna and the display comes in lengths of 10 m, 15 m, 20 m and 30 m. Whatever length is used it must be unbroken; namely, no splicing allowed.

(2)Deposits and fumes from a funnel or other exhaust vent can adversely affect the aerial performance and hot gases may distort the radiator portion. The an-

tenna unit must not be mounted where the temperature is more than 70°C.

Mounting

Figure 5-1 Typical antenna unit location

Unpacking the antenna unit

1.Open the antenna unit packing box carefully.

2.Unbolt the four bolts at the base of the ra- dome to remove the radome cover.

Radome cover

Figure 5-2 Antenna unit

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Contents Marine Radar B . N o . O M E 3 4 4 4 Safety Instructions Stay away from transmitting antenna Do not open the equipmentDo not disassemble or modify the equipment Do not operate the equipment with wet handsUse the correct fuse IiiTable of Contents Foreword FeaturesAntenna Unit SpecificationsTransceiver Module contained in radome Display UnitInterface Nmea Accessories FP03-05900 Installation Materials CP03-15xxEquipment List Complete SetOptional Equipment Model 841 MARK-2 ConfigurationPrinciple of Operation How radar works Control Description OperationTurning the Radar On and Off Display Indications and Markers5NM 675NM 220.9R 0.646NM 308.7RAdjusting Control Panel Brilliance Adjusting LCD Backlighting and Display ToneTransmitting Selecting the RangeSTC MAN Auto Adjusting GAIN, STC, A/C Rain and FTCGeneral procedure Adjusting A/C Rain Tuning the ReceiverAdjusting FTC How to tune manuallyMeasuring the Bearing Measuring the RangeSee the table on the next Menu OperationPress the Menu key to open the menu. The main menu appears Menu Function Menu description11 Display modes Selecting the Display ModeWindow Display Selecting the Presentation ModeCourse-up, you may select CU or WPT- UP, on the menu CU course-upSetting the guard zone Guard AlarmSilencing the audible alarm WPT-UP waypoint-upSuppressing Radar Interference Canceling the guard zoneSelecting Pulselength Suppressing Noise InterferenceOff Centering the Display Navigation Data Display Echo TrailsEcho Stretch magnifying long range echoes Setting up the nav data displayPress the Menu key Select Nav Data and press the ENT key Turning echo stretch on or offSelecting Bearing Reference Selecting Unit of Measurement for RangeWatchman Turning on watchmanErasing the Heading Marker Canceling watchmanDeselecting Ranges Displaying Navigation Data During Stand-byError Visual alarm Visual Alarm IndicationsOutputting Cursor Position to Navigator Displaying Cursor Position, Range and Bearing to CursorRadar Wave and Radar Horizon Interpreting the DisplayTarget Properties and Radar Wave Reflection Super-refractionRange Resolution Bearing ResolutionFalse Echoes Multiple echoesIndirect echoes Side-lobe echoesNautical Chart and Radar Picture Safety Information Maintenance & Troubleshooting Period Check point Remarks Preventative Maintenance Replacing the Fuse But Then TroubleshootingSelf Test Self TestMounting Antenna Unit InstallationSiting, handling considerations 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 connectionFor E/S To connect external equipment to the OP- Tion connectorNavigation aid, video sounder connection Heading Sensor ConnectionRadar Installation Check ListFollow the procedure below to obtain proper radar picture Initial Adjustment of PictureDisplaying the Installation Menus Sweep Timing Entering Initial SettingsRelative Bearing Alignment Press the Menu key and turn off the power Closing the Installation MenusPage Page Page Page Page Page
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