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Furuno 821 Operator's Manual

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MARINE RADAR
MODEL 821/841
MODEL

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Summary of Contents for Furuno 821

  • Page 1 MARINE RADAR MODEL 821/841 MODEL...
  • Page 2 Yo u r L o c a l A g e n t / D e a l e r 9 - 5 2 , A s h i h a r a - c h o , N i s h i n o m i y a , J a p a n Te l e p h o n e : 0 7 9 8 - 6 5 - 2 111 Te l e f a x :...
  • Page 3 SAFETY INFORMATION Safety Arrangements All known steps are taken in the design of this radar to ensure that electromagnetic radio frequency energy radiated by the equipment will not be a hazard to personnel. This is true if the following precautions are met. •...

  • Page 4: Table Of Contents

    2.26 Watchman ........18 TABLE OF CONTENTS 2.27 Erasing the Heading Marker .... 19 2.28 Deselecting Ranges ......19 2.29 Displaying Navigation Data During FOREWORD ........ii Stand-by ........... 19 2.30 Outputting Cursor Position to SPECIFICATIONS ......iii Navigator ......... 20 EQUIPMENT LIST ......

  • Page 5: Foreword

    • Operates on 10.2 to 31.2 V DC power have the unit installed by a FURUNO rep- supply and consumes about 40 W. resentative or other qualified technician. The importance of a thorough installation can- •...

  • Page 6: Specifications

    10. Bandwidth SPECIFICATIONS– 7 MHz MODEL 821 11. Duplexer Circulator with diode limiter Antenna Unit Display Unit 1. Radiator 1. Indication system Printed array PPI raster scan 2. Radiator length 2. Display 40 cm 8-inch diagonal LCD, STN semi- 3. Horizontal beamwidth transparent, yellow mode 3.
  • Page 7 With navigation input (option): Course SPECIFICATIONS– (CRS), Latitude and longitude, Speed MODEL 841 (SPD), Range and bearing to waypoint (WP), Cross Track Error (XTE), Date and time, Water depth, Water temperature. (This radar has Antenna Unit only two data input ports. To receive data from more than two equipment 1.

  • Page 8: Display Unit

    9. Receiver front end With navigation input (option): Course MIC (Michoeave IC) (CRS), Latitude and longitude, Speed 10. Bandwidth (SPD), Range and bearing to waypoint 7 MHz (WP), Cross Track Error (XTE), Date 11. Duplexer and time, Water depth, Water Circulator with diode limiter temperature.
  • Page 9 17. Compass safe distance Interface NMEA (MODEL 821/841) Input Own ship’s position : RMA>RMC>GLL (GLL is available Ver.5 and after.) Speed : RMA>RMC>VTG>VHW Heading(True): HDT>VHW>HDG>VHW>HDM Heading (Magnetic): HDM>VHW>HDG>VHW>HDM Course (True): RMA>RMC>VTG Course (Magnetic) VTG>RMA>RMC Waypoint (L/L, Range, Bearing): RMB>BWC>BWR Loran time difference : RMA>GLC>GTD Water depth : DPT>DBK, DBS, DBT Water temperature : MDA>MTW...

  • Page 11: Configuration

    CONFIGURATION OF MODEL 821/841 Antenna Unit (MODEL 821) MODEL 821/841 (In/Out) IEC 1162* Remote Display FMD-811 IEC 1162* Video Sounder (In) Fluxgate Heading Sensor C-2000 External Alarm Gyro Gyro Converter Buzzer OP03-136 AD-100 *Equivalent to NMEA0183 Option Rectifier RP-62 115/230VAC 10.2~31.2VDC viii...

  • Page 12: Principle Of Operation

    1. PRINCIPLE OF 1.4 How Radar Determines Bearing OPERATION The bearing to a target found by the radar is determined by the direction in which the radar scanner antenna is pointing when it 1.1 What is Radar? emits an electronic pulse and then receives a returning echo.
  • Page 13 Heading marker Targets Range and bearing of a target, relative to own ship, are readable on the PPI. Own ship Own ship in center (radar) (A) Bird's eye view of situation (B) Radar picture of (A) Figure 1-1 How radar works...

  • Page 14: Control Description

    2. OPERATION 2.1 Control Description Cursor pad Shift cursor, VRM and EBL; select items and options on menu. Registers selection MENU Opens/closes menus. on menus. Press to adjust gain, ECHO Erases heading marker; A/C RAIN, STC selects cursor data (Lat/Long, R/B); and FTC.

  • Page 15: Display Indications And Markers

    2.2 Display Indications and Markers Heading (requires heading data) Range Echo trail, AUTO tuning TRAIL AUTO Echo trail elapsed time, Range ring interval HDG 326.8° 0:00 echo trail time, tuning indicator G (IN) Presentation mode FTC1 Guard zone Off center CENTER Fast Time Constant Pulsewidth...

  • Page 16: Transmitting

    2.4 Transmitting 2.6 Adjusting LCD Backlighting and Display Tone After the power is turned on and the mag- netron has warmed up, ST-BY (Stand-By) The [BRILL] key adjusts the LCD back- appears at the screen center. This means the lighting in eight levels, including off. The radar is now fully operational.

  • Page 17: Adjusting Gain, Stc, A/Crain And Ftc

    How to adjust STC (suppressing sea 2.8 Adjusting GAIN, STC, A/C clutter) RAIN and FTC Echoes from waves can be troublesome, General procedure covering the central part of the display with random signals known as sea clutter. The The [ECHO] key enables adjustment of the higher the waves, and the higher the scan- gain, STC, A/C RAIN and FTC.

  • Page 18: Tuning The Receiver

    How to adjust A/C RAIN and FTC 2.9 Tuning the Receiver (suppressing rain clutter) The receiver can be tuned automatically or The vertical beamwidth of the scanner is de- manually. For automatic tuning the receiver signed to see surface targets even when the is tuned each time you switch from stand- ship is rolling.

  • Page 19: Measuring The Range

    2.10 Measuring the Range You can measure the range to a target three ways: by the range rings, by the cursor, and by the VRM (Variable Range Marker). Target By range rings Press the [RINGS] key to display the range rings.

  • Page 20: Menu Operation

    To erase the EBL, press and hold down the 2.12 Menu Operation [EBL] key for about three seconds. The menu, consisting of 6 sub menus, mostly contains less-often used functions which once preset do not require regular adjust- ment. To open or close the menu, press the Target [MENU] key.
  • Page 21 Table 1-1 Menu description Menu Function 1. Selects control panel backlighting; four is 1. BACKLIGHT/BRILLIANCE MENU maximum backlighting. Select item and option 2. Selects brilliance for echo trails and keys. markers; four is maximum brilliance. 1. Panel 1 2 3 4 2.

  • Page 22: Selecting The Display Mode

    2.13 Selecting the Display Each time the key is pressed the display mode changes in one of the sequences shown Mode below, depending on equipment connected and menu settings. The display mode may be selected with the [DISP MODE] key. Four modes are avail- Note: In the window display mode, the [DISP able (with navigation input): Normal, Nor- MODE] key reselects zoom area.

  • Page 23: The Window Display

    2.14 The Window Display Area selector (1/4 or 1/3 of range) The window display appears at the bottom right (or left) 1/4 of the display. Two types of window displays are available: zoom and wide. Zoom doubles the size of the area se- Window lected by the operator, and wide (range-up) display...

  • Page 24: Guard Alarm

    WPT-UP (waypoint-up) Selecting guard zone type The guard alarm can be set to sound on tar- An azimuth stabilized display in which the gets entering (guard in) or exiting (guard out) line connecting the center with the top of the guard zone. Select type of guard zone the display indicates the bearing to the “TO”...

  • Page 25: Suppressing Radar Interference

    reverse video. You can silence the alarm by precipitation. As the level of these returns pressing the [GUARD] key. When this is varies with environment, the operator done, G (ACKN) replaces G (IN) (or G should properly adjust the STC, gain (sen- (OUT)).

  • Page 26: Suppressing Noise Interference

    corner on the display when the interference 2.20 Off Centering the Display rejection circuit is turned on. Your vessel’s position can be shifted any- where within 75% of the effective display area. The primary advantage of the off cen- 2.18 Suppressing Noise tered display is that for any range setting, Interference the view ahead of your vessel can be ex-...

  • Page 27: Echo Trails

    Continuous trail 2.21 Echo Trails The maximum continuous trail time is 99 You can show the trails of targets in after- minutes and 59 seconds. When the elapsed glow. This function is useful for alerting you time clock counts up to that time the elapsed to possible collision situations.

  • Page 28: Echo Stretch

    4) Select Nav Data Disp to OFF or ON. 5) Select Pos Disp Mode to L/L (latitude and AUTO HDG 326.8° longitude or TD (Loran C). 6) Select unit of depth measurement to meters, fathoms, or feet. 7) Select unit of measurement for water tem- perature to Centigrade or Fahrenheit.

  • Page 29: Selecting Unit Of Measurement For Range

    5) Press the [ENT] key followed by the 3) Select EBL Ref. [MENU] key. ES appears at the top right 4) Select Rel(ative) or True. side on the display when the echo stretch feature is on. 5) Press the [ENT] key followed by the [MENU] key.

  • Page 30: Erasing The Heading Marker

    Press any key while the radar is transmit- vessel’s position in latitude and longitude, ting. (Pressing a key during stand-by causes the range and bearing to waypoint, speed, the radar to go to warm-up condition.) course, date, time and cross track error may be input to this radar, and be seen in the bot- tom text area during stand-by.

  • Page 31: Outputting Cursor Position To Navigator

    2.30 Outputting Cursor Position to Navigator Cursor position (NMEA0183 data sentence TLL) can be output to the navigator con- nected to this radar by pressing and holding down the [HM OFF] key. 2.31 Displaying Cursor Position, Range and Bearing to Cursor The cursor data indication at the bottom of the display can show cursor position in lati-...

  • Page 32: Interpreting The Display

    Radar horizon 3. INTERPRETING Radar is essentially a “line-of-sight” phe- THE DISPLAY nomenon. That means you have just about the same range to horizon with a radar as you do with your own eyes. However under normal atmospheric conditions, the radar As an aid to navigation, radar can be a very horizon is 6% greater than the optical hori- valuable tool.

  • Page 33: Range Resolution

    On the other hand, hulls made from wood 3.4 Bearing Resolution or fiberglass return much weaker echoes. Bearing resolution is a measure of the capa- Vertical surfaces, such as a cliff, are good bility of a radar to display as separate tar- targets provided they face the radar.
  • Page 34 Indirect echoes oes may be observed on the display at double, triple or other multiples of the ac- Indirect echoes may be returned from either tual range of the target as shown in Figure a passing ship or returned from a reflecting 3-4.

  • Page 35: Nautical Chart And Radar Picture

    Blind and shadow sectors 3.6 Nautical Chart and Radar Picture Funnels, stacks, masts, or derricks in the path of antenna may reduce the intensity of the Under normal conditions, a picture which radar beam. If the angle subtended at the is similar to a nautical chart can be obtained scanner is more than a few degrees a blind on the radar display.

  • Page 36: Maintenance & Troubleshooting

    RF RADIATION HAZARD 4. MAINTENANCE & The radar scanner emits high fre- TROUBLESHOOTING quency radio radiation which can be harmful, particularly to your eyes. Never look directly into the scanner from a distance of less than two feet when the radar is in This chapter tells you how to keep your ra- operation as you could injure the cornea of dar in good working order.

  • Page 37: Preventative Maintenance

    4.2 Preventative Maintenance 4.3 Replacing the Fuse Regular maintenance is important for good The 5A fuse in the power cable protects the performance. Always keep the equipment as equipment against reverse polarity of ship’s free as possible from dirt, dust, and water mains, overcurrent, and equipment fault.

  • Page 38: Troubleshooting

    4.4 Troubleshooting Table 4-2 contains simple troubleshooting procedures which you can follow to try to restore normal operation. If you cannot re- store normal operation, do not attempt to check inside any unit of the radar system. Any repair work is best left to a qualified technician.

  • Page 39: Self Test

    4.5 Self Test The self test facility checks the keyboard, ROM and RAM for proper operation. You may run the test as follows. 1) Press the [MENU] key. 2) Select Self Check. The following display appears. [SELF TEST] KEY BOARD TEST Press each key.

  • Page 40: Installation

    • A magnetic compass will be affected if 5. INSTALLATION placed too close to the antenna unit. Ob- serve the minimum compass safe dis- tances to prevent deviation of a magnetic compass: This chapter covers installation. Installation mainly consists of the following: Table 5-1 Compass safe distances •...
  • Page 41 Mounting procedure for MODEL 821 Mounting platform Removing packing materials 3) Prepare a platform of 5 to 10mm in thickness for the antenna unit. (For sail- 1) Open the radome cover carefully. Re- boats, an optional mounting bracket move mounting hardware at the bottom which can be fixed to a mast is avail- of the radome base assembly;...
  • Page 42 Wiring and final preparation inside the 5) Make sure the vent tube is in the correct position, and then fasten the radome base antenna unit for MODEL 821 to the mounting platform with four each 1) Drill a hole of at least ø27mm through of M10 x 20 hex bolts, flat washers and the deck or bulkhead to run the signal spring washers (supplied).
  • Page 43 5) Connect three plugs to the antenna unit: P801 (9 way), P813 (2 way), and P810 (10 way). J813 J810 TP804 Figure 5-5 Antenna unit (MODEL 821), inside view 6) Put the radome on the radome base as- 7) Tighten the fixing bolts for the radome. sembly.
  • Page 44 Mounting procedure for MODEL 841 Mounting platform Removing packing materials 3) Prepare and fasten a platform of 5 to 10mm in thickness to the mounting lo- 1) Open the radome cover carefully. Re- cation. (For sailboats, an optional mount- move mounting hardware at the bottom ing bracket which can be fixed to a mast of the radome base assembly;...
  • Page 45 Wiring and final preparation inside the 5) Make sure the vent tube is in the correct position, and then fasten the radome base antenna unit for MODEL 841 to the mounting platform with four each 1) Drill a hole of at least ø20mm through of M10 x 20 hex bolts, flat washers and the deck or bulkhead to run the signal spring washers (supplied).
  • Page 46 8) Put the radome on the radome base as- 9) Tighten the fixing bolts for the radome. sembly. The arrow should face toward 10) The cable run must be properly sup- the bow. ported, and must not be used to provide impromptu foot-holds or hand-holds! Clips or hangers should be employed every 20 cm.

  • Page 47: Display Unit Installation

    5.2 Display Unit Installation • The orientation of the display unit should be so the radar screen is viewed while the operator is facing in the direction of the Mounting considerations bow. This makes determination of your When selecting a mounting location for the position much easier.
  • Page 48 10mm 222(8.7") Cutting size for flushmount 4 - ø6 FIXING HOLES (10.79") (5.12") (3.15") (0.71") *140 (5.51") (9.37") (0.39") (3.94") * :SERVICING CLEARANCE (0.79") (0.71") *80 (3.15") Figure 5-13 How to mount the display unit...
  • Page 49 Connect signal cable SER.NO. DATE COMPASS SAFE DISTANCE from antenna here. M STEER EQUPMENT CLASS FURUNO ELECTRIC CO., LTD Ground terminal Connect ground wire between here and ship's ground. CAUTION Tigthen the boot-boud securely to ensure watertightness. See page 44.
  • Page 50 Navigation aid, video sounder Cable supplied DISPLAY connection with radar UNIT (connector assy. If your navigation aid can output data in 03-1796(5)) NMEA 0183 data format, your vessel’s po- sition in latitude and longitude, the range and bearing to waypoint, speed, and course may VIDEO SPU-9180 be input to this radar, and be seen in the bot-...

  • Page 51: Installation Check List

    9. Replace the covers removed in step 1. 10.Connect navaid and other equipment to radar. SPU-9180 Parts side 11.Turn on the radar and confirm that NAV data in properly received at the radar and external equipment. Remove JP3. CR14 5.3 Installation Check List After completing the installation it is a good Remove R91 and R92.

  • Page 52: Initial Adjustment Of Picture

    Are all connectors at the rear of the 5) Select minimum range. Press the display unit fastened securely? [ECHO] key and press the cursor pad to select STC-AUTO, if it is not already se- lected. CAUTION If it is necessary to open the display unit, be sure the rear cover is fitted to the front chassis 5.5 Displaying the Installation properly when closing the rear cover.

  • Page 53: Relative Bearing Alignment

    3) Press the cursor pad to select Installa- 5) Press the [ENT] key. tion Setup 1 and press the [ENT] key. Leave the menu open to complete the next several adjustments. INSTALLATION SETUP 1 Select item and option keys. 1. Key Beep OFF ON 5.7 Relative Bearing Alignment 2.

  • Page 54: Closing The Installation Menus

    6) As a final test, move the boat towards a small buoy and confirm that the buoy shows up dead ahead on the radar when it is visually dead ahead. 5.8 Sweep Timing (1) Correct (2) Target pushed (3) Target pushed inward outward This adjustment ensures proper radar per-...

  • Page 55: Signal Cable Connection

    5.10 Signal cable connection 1. Connect the signal cable to DJ-1 on the rear panel of the display unit. Rubber cover Boot-band DJ Connector Cable DJ-1 Display unit 2. Cover the connector with the rubber cover. The projection on the connector base is inserted into the groove on the rubber cover.

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