Furuno 821, 841 manual Removing packing materials, Mounting platform, Vent tube

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Mounting procedure for MODEL 821

Removing packing materials

1)Open the radome cover carefully. Re- move mounting hardware at the bottom of the radome base assembly; four each of M10 bolts, spring washers and flat washers. This hardware may be dis- carded; do not use them to fix the an- tenna unit to the mounting platform.

Flat

washer

Spring

washer M10 x 20 hex head bolt

Figure 5-2 Antenna unit (MODEL 821), showing location of mounting hardware

2)Unfasten the fixing bolts for the radome base.

Fixing

Rubber

washer

bolt

 

Figure 5-3 Antenna unit (MODEL 821),

showing location of fixing bolts

Mounting platform

3)Prepare a platform of 5 to 10mm in thickness for the antenna unit. (For sail- boats, an optional mounting bracket which can be fixed to a mast is avail- able. See page 35 for details.)

The mounting surface must be parallel with the waterline and provided with five holes whose dimensions are shown in the outline drawing at the back of the manual. Four 10mm holes for fixing, and one 20mm hole for the vent tube.

There is a cable entry (cable gland) out- side the antenna unit which should face the stern direction. The unit is adjusted so a target echo returned from the bow direction will be shown on the zero de- gree (heading marker) position on the screen. When drilling holes, be sure they are parallel with the fore and aft line.

Vent tube

Moisture can condense inside the ra- dome, causing corrosion, if a means is not provided to keep moisture out of the radome. A vent tube fitted on the base of the radome allows the radome to "breathe" while not allowing entry of water from outside into the radome. Be sure the tube is kept free of foreign ma- terials and is not pinched or kinked. The vent tube extends downward by 27mm from the radome base. Ensure the vent tube extends downward before mount- ing the radome base.

4)Find the cable entry on the radome base. Position the radome base so the cable entry faces the stern direction. (This alignment must be as accurate as pos- sible.)

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Contents Marine Radar First Edition AUG Electrical Shock Hazard Safety ArrangementsGround both the Display Unit and the Antenna Unit Useable EnvironmentTable of Contents Foreword FeaturesAntenna Unit SPECIFICATIONS- ModelTransceiver Module contained in radome Display UnitProtection features Power supply & power consumptionWarm-up time Modulator switching method VibrationReceiver front end MIC Michoeave IC Bandwidth 7 MHz Duplexer Ambiont temperatureInterface Nmea Model 821/841 Page Model 821/841 ConfigurationPrinciple of Operation How radar works Control Description OperationTurning the Radar On Off Display Indications and MarkersAdjusting Control Panel Brilliance Adjusting LCD Backlighting and Display ToneTransmitting Selecting the RangeSTC MAN Auto Adjusting GAIN, STC, A/C Rain and FTCAdjusting A/C Rain Tuning the ReceiverAdjusting FTC How to tune manuallyMeasuring the Bearing Measuring the RangeTarget on collision course with your vessel? Menu OperationMenu description 11 Display modes Selecting the Display ModeCU course-up Selecting the Presentation ModeWindow Display WPT-UP waypoint-up Guard AlarmGuard Suppressing Radar InterferenceSelecting Pulselength Suppressing Noise InterferenceOff Centering the Display Navigation Data Display Echo TrailsPress the Menu key Select Nav Data and press the ENT key Echo Stretch magnifying long range echoesWatchman 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 Radar Wave and Radar Horizon Interpreting the DisplayTarget Properties and Radar Wave Reflection Super-refractionFalse Echoes Bearing ResolutionRange Resolution Multiple echoes Blind and shadow sectors Nautical Chart and Radar PictureSafety Information Maintenance & TroubleshootingForming any maintenance or Troubleshooting procedureReplacing the Fuse Preventative MaintenanceTroubleshooting table TroubleshootingSelf Test Self TestAntenna Unit Installation 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 Procedure Option connectorInstallation Check List Displaying the Installation Menus Initial Adjustment of PictureRelative Bearing Alignment Entering Initial SettingsSweep Timing Closing the Installation MenusSignal cable connection Page Page Page Page Page Page Page