Page 2 - F I R S T E D I T I O N
C 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 1 1 1 Te l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0 Y o u r L o c a l A g e n t / D e a l e r A l l r i g h t s r e s e r v e d . P U B . N o . O M E - 3 4 1 6 0 M O D E L 8 2 1 / 8 4 1 ( Y O S H ) ...
Page 3 - Safety Arrangements; SAFETY INFORMATION; WARNING
DANGER Safety Arrangements All known steps are taken in the design of this radar to ensure that electromagnetic radiofrequency energy radiated by the equipment will not be a hazard to personnel. This is true ifthe following precautions are met. • Each piece of equipment is grounded to an adequate gr...
Page 4 - TABLE OF CONTENTS; INTERPRETING THE DISPLAY
i TABLE OF CONTENTS FOREWORD ..................................... iiSPECIFICATIONS ........................... iiiEQUIPMENT LIST .......................... viiCONFIGURATION ......................... viii 1. PRINCIPLE OF OPERATION ....... 1 1.1 What is Radar? ..................................... 11...
Page 5 - ii; FOREWORD; Features
ii FOREWORD Congratulations on your choice of theFURUNO MODEL 821/MODEL 841 Ma-rine Radar. We are confident you will seewhy the FURUNO name has become syn-onymous with quality and reliability. For over 40 years FURUNO Electric Com-pany has enjoyed an enviable reputation forinnovative and dependable ...
Page 6 - iii; Antenna Unit
iii SPECIFICATIONS–MODEL 821 Antenna Unit 1. Radiator Printed array 2. Radiator length 40 cm 3. Horizontal beamwidth 5.7 ° 4. Vertical beamwidth 30˚ 5. Sidelobe Less than -20dB 6. Polarization Horizontal 7. Antenna rotation speed 24 rpm 8. Wind resistance Relative wind speed 100 kts (51.5 m/s) Trans...
Page 7 - iv; Total amplitude; Printed array
iv With navigation input (option): Course(CRS), Latitude and longitude, Speed(SPD), Range and bearing to waypoint(WP), Cross Track Error (XTE), Dateand time, Water depth, Watertemperature. (This radar hasonly two data input ports. To receive data from more than two equipment install an mixing device...
Page 8 - Display Unit
v 9. Receiver front end MIC (Michoeave IC) 10. Bandwidth 7 MHz 11. Duplexer Circulator with diode limiter Display Unit 1. Indication system PPI raster scan 2. Display 8-inch diagonal LCD, STN semi-transparent, yellow mode 3. Range scales (nm) Range, Ring Interval: 0.125(0.0625),0.25(0.125), 0.5(0.12...
Page 9 - Input; RSD : A cycle of four seconds
vi 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>...
Page 11 - viii
viii 5A NAV Video Sounder Gyro Gyro Converter AD-100 *Equivalent to NMEA0183 Option IEC 1162* IEC 1162* (In/Out) (In) Fluxgate Heading Sensor C-2000 Antenna Unit(MODEL 821) Remote Display FMD-811 External Alarm Buzzer OP03-136 Rectifier RP-62 10.2~31.2VDC 115/230VAC MODEL 821/841 CONFIGURATION OFMOD...
Page 12 - The Radar Display
1 1. PRINCIPLE OFOPERATION 1.1 What is Radar? The term "RADAR" is an acronym mean-ing RAdio Detection And Ranging. Al-though the basic principles of radar weredeveloped during World War II, primarilyby scientists in Great Britain and the UnitedStates, the use of echoes as an aid to navi-gati...
Page 13 - Figure 1-1 How radar works
2 A B C D Own ship(radar) D A B C Heading marker Targets Own shipin center Range and bearingof a target, relativeto own ship, arereadable on the PPI. (A) Bird's eye view of situation (B) Radar picture of (A) Figure 1-1 How radar works
Page 14 - Control Description; Figure 2-1 Control panel
3 2. OPERATION 2.1 Control Description Cursor padShift cursor, VRMand EBL; selectitems and optionson menu. Selects display mode; erases heading error indication. Turns power on/off. Adjusts display brilliance. Sets radar in stand-by;transmits radar pulse. Selects radar range. Plots targets' trails. ...
Page 15 - Display Indications and Markers; Figure 2-2 Display indications; Turning the radar on; CAUTION
4 2.2 Display Indications and Markers 0.5 Range Range ring interval Echo trail, AUTO tuningEcho trail elapsed time,echo trail time, tuning indicatorGuard zoneFast Time Constant(rain clutter suppressor)Echo stretchInterference rejector EBL Range ring Cursor Heading marker Guard zone area VRM HDG 326....
Page 16 - Selecting the Range; • When navigating in or around crowded; Procedure; Figure 2-3 Display for adjustment of; Procedure; ) Press the cursor pad to select Backlight/
5 2.4 Transmitting After the power is turned on and the mag-netron has warmed up, ST-BY (Stand-By)appears at the screen center. This means theradar is now fully operational. In stand-bythe radar is available for use at anytime—but no radar waves are being transmitted. Press the [ST-BY TX] key to tra...
Page 17 - General procedure; GAIN; Figure 2-4 Display for adjustment of; Figure 2-5 Effect of STC
6 2.8 Adjusting GAIN, STC, A/CRAIN and FTC General procedure The [ECHO] key enables adjustment of thegain, STC, A/C RAIN and FTC. 1) Press the [ECHO] key. The following dis- play appears. AUTO 1 2 3 MAN AUTO 1 2 3 MAN GAIN STC ◆ ◆ [[ A/C RAIN 00 FTC 0 1 2 12 ECHO KEYTO EXIT Currentlevel Item selecte...
Page 18 - Adjusting FTC; Tuning the Receiver; Figure 2-7 Tuning indicator; Manual tuning; ) Press the cursor pad to select Tuning.; How to tune manually
7 How to adjust A/C RAIN and FTC(suppressing rain clutter) The vertical beamwidth of the scanner is de-signed to see surface targets even when theship is rolling. However, by this design theunit will also detect rain clutter (rain, snow,hail, etc.) in the same manner as normal tar-gets. Figure 2-6 s...
Page 19 - Figure 2-8 Measuring range by the VRM; Measuring the Bearing; By cursor; ) Press the cursor pad to bisect the target; Measuring the Range; By range rings; key to display the VRM.
8 1.5 NM 0.5 VRM range VRM Target VRM EBL + CURSOR 0.675 NM 220.9° R 0.675 NM 308.7° R Figure 2-8 Measuring range by the VRM 2.11 Measuring the Bearing There are two ways to measure the bearingto a target: by the cursor, and by the EBL(Electronic Bearing Line). By cursor Operate the cursor pad to bi...
Page 20 - Figure 2-9 Measuring bearing by the EBL; Tips for measuring the bearing; Figure 2-10 Main menu; Menu description
9 To erase the EBL, press and hold down the[EBL] key for about three seconds. 1.5 NM 0.5 EBL Target EBLbearing VRM EBL + CURSOR 0.675 NM 300.1° R 0.675 NM 300.1° R Figure 2-9 Measuring bearing by the EBL Tips for measuring the bearing • Bearing measurements of smaller targets are more accurate; the ...
Page 21 - Table 1-1 Menu description
10 Table 1-1 Menu description Menu Function 1. Selects control panel backlighting; four is maximum backlighting.2. Selects brilliance for echo trails and markers; four is maximum brilliance. 1. Selects pulselength for 1.5 and 3 mile ranges.2. Selects radar interference rejector level; 3 provides hig...
Page 22 - Figure 2-11 Display modes
11 2.13 Selecting the DisplayMode The display mode may be selected with the[DISP MODE] key. Four modes are avail-able (with navigation input): Normal, Nor-mal + Window, Normal + Nav Data, andNormal + Window + Nav Data. Each time the key is pressed the displaymode changes in one of the sequences show...
Page 23 - The Window Display; Selecting the type of window display; ) Select Window Display to Zoom or Wide; Selecting the area for the zoom picture; ) Press the cursor pad to place the circle
12 2.14 The Window Display The window display appears at the bottomright (or left) 1/4 of the display. Two typesof window displays are available: zoom andwide. Zoom doubles the size of the area se-lected by the operator, and wide (range-up)compresses and displays the entire radar pic-ture on the nex...
Page 24 - Figure 2-13 In and out alarms; Setting the guard zone
13 WPT-UP (waypoint-up) An azimuth stabilized display in which theline connecting the center with the top ofthe display indicates the bearing to the “TO”waypoint, which is selected on the naviga-tional equipment connected to the radar.When navigating a route and own ship en-ters the arrival zone of ...
Page 25 - • When the radar range is less than one half; Figure 2-14 How to set a guard zone; est degree of interference rejection
14 reverse video. You can silence the alarm bypressing the [GUARD] key. When this isdone, G (ACKN) replaces G (IN) (or G(OUT)). Press the [GUARD] key again to reactivatethe alarm. G (IN) (or G (OUT)) replaces G(ACKN). Canceling the guard zone Press and hold down the [GUARD] key untilthe guard zone d...
Page 26 - Selecting Pulselength; ) Select Pulselength to SHORT or LONG; Off Centering the Display; ) Locate the cursor where you want to the
15 corner on the display when the interferencerejection circuit is turned on. 2.18 Suppressing NoiseInterference Noise interference appears on the screen asmany bright dots. These dots can be sup-pressed by turning on the noise rejector. Notehowever that there are some forms of noiseinterference whi...
Page 27 - Starting echo trail; Figure 2-17 Appearance of echo trails; Fixed time trails; ) Select Backlight/Brilliance and press the; Canceling echo trails; • position in latitude and longitude or Lo-
16 2.21 Echo Trails You can show the trails of targets in after-glow. This function is useful for alerting youto possible collision situations. Starting echo trail Press the [TRAIL] key to start the echo trailfunction. Afterglow starts extending fromtargets and "TRAIL" and the echo trail tim...
Page 28 - Figure 2-18 Sample nav data display; Setting up the nav data display; Figure 2-19 Nav data menu; Turning echo stretch on or off
17 1.5 NM 0.5 HDG 326.8° 66° 04. 00N 166° 04. 00E VRM EBL + CURSOR 0.675 NM 240.1° R 0.646 NM 308.7° R DEPTH XTE SPD 350.0m 0.05NML 30.0KT WAYPOINT POSI L/L 12.0 NM 45.0° M AUTO Figure 2-18 Sample nav data display Setting up the nav data display 1) Press the [MENU] key. 2) Select Nav Data and press ...
Page 29 - How watchman works; Figure 2-21 How watchman works; Turning on watchman; with the guard alarm function.; Canceling watchman
18 5) Press the [ENT] key followed by the [MENU] key. ES appears at the top rightside on the display when the echo stretchfeature is on. Note 1: This function magnifies not only tar-gets but also sea clutter and radar interference.For this reason be sure the controls for adjust-ment of sea clutter a...
Page 30 - Deselecting Ranges; Active ranges appear in reverse video.; ) Select the Nav Data menu and press the; Figure 2-22 Navigation data display; ST–BY
19 Press any key while the radar is transmit-ting. (Pressing a key during stand-by causesthe radar to go to warm-up condition.) 2.27 Erasing the HeadingMarker The heading marker continuously appearson the display and shows your vessel’s head-ing. When this mark obscures a target echo,you can tempora...
Page 31 - Visual Alarm Indications; Table 2-1 Visual alarm indications
20 2.30 Outputting CursorPosition to Navigator Cursor position (NMEA0183 data sentenceTLL) can be output to the navigator con-nected to this radar by pressing and holdingdown the [HM OFF] key. 2.31 Displaying CursorPosition, Range and Bearing toCursor The cursor data indication at the bottom ofthe d...
Page 32 - Radar horizon; Figure 3-1 Radar horizon; How the radar wave travels
21 Radar horizon Radar is essentially a “line-of-sight” phe-nomenon. That means you have just aboutthe same range to horizon with a radar asyou do with your own eyes. However undernormal atmospheric conditions, the radarhorizon is 6% greater than the optical hori-zon. Therefore, if the target does n...
Page 33 - Figure 3-2 Range resolution; Bearing Resolution; Figure 3-3 Bearing resolution; Multiple echoes
22 On the other hand, hulls made from woodor fiberglass return much weaker echoes. Vertical surfaces, such as a cliff, are goodtargets provided they face the radar. Con-versely, horizontal and smooth surfaces suchas mudbanks, sandy beaches, and gentlysloping hills make poor targets because theydispe...
Page 34 - Indirect echoes; • their shapes may indicate they are not di-
23 Indirect echoes Indirect echoes may be returned from eithera passing ship or returned from a reflectingsurface on your own ship, for example, astack. In both cases, the echo will return froma legitimate contact to the antenna by thesame indirect path. The echo will appear onthe same bearing of th...
Page 35 - Blind and shadow sectors; Figure 3-7 Blind and shadow sectors
24 Blind and shadow sectors Funnels, stacks, masts, or derricks in the pathof antenna may reduce the intensity of theradar beam. If the angle subtended at thescanner is more than a few degrees a blindsector may be produced. Within the blindsector small targets at close range may notbe detected while...
Page 36 - Safety Information; RF RADIATION HAZARD
25 4. MAINTENANCE &TROUBLESHOOTING This chapter tells you how to keep your ra-dar in good working order. Before review-ing this chapter please read the safetyinformation which follows. 4.1 Safety Information ELECTRICALSHOCKHAZARD T h i s e q u i p m e n tuses high voltageelectricity whichcan sho...
Page 37 - Table 4-1 Recommended maintenance program
26 4.2 Preventative Maintenance Regular maintenance is important for goodperformance. Always keep the equipment asfree as possible from dirt, dust, and watersplashes. Make sure all screws securing thecomponents are properly tightened. A maintenance program should be estab-lished and should at least ...
Page 38 - Table 4-2 Troubleshooting table
27 4.4 Troubleshooting Table 4-2 contains simple troubleshootingprocedures which you can follow to try torestore normal operation. If you cannot re-store normal operation, do not attempt tocheck inside any unit of the radar system.Any repair work is best left to a qualifiedtechnician. Table 4-2 Trou...
Page 40 - Antenna Unit Installation; Mounting considerations; Table 5-1 Compass safe distances; NOTICE
29 5. INSTALLATION This chapter covers installation. Installationmainly consists of the following: • siting and mounting the display unit and the antenna unit • connection of the signal cable and the power cable • establishing the ground• connecting optional equipment, and• adjustments. 5.1 Antenna ...
Page 41 - Mounting platform; ) Prepare a platform of 5 to 10mm in; Vent tube; ) Find the cable entry on the radome base.; Mounting procedure for MODEL 821; Removing packing materials; ) Unfasten the fixing bolts for the radome; Fixing; Spring
30 Mounting platform 3) Prepare a platform of 5 to 10mm in thickness for the antenna unit. (For sail-boats, an optional mounting bracketwhich can be fixed to a mast is avail-able. See page 35 for details.) The mounting surface must be parallelwith the waterline and provided with fiveholes whose dime...
Page 42 - ) Make sure the vent tube is in the correct; Flat; Figure 5-4 How to fasten the radome base
31 5) Make sure the vent tube is in the correct position, and then fasten the radome baseto the mounting platform with four eachof M10 x 20 hex bolts, flat washers andspring washers (supplied). Do not over-tighten the bolts; the tightening torqueshould be between 200 and 250 kg cm. ,,,,,, ,,,,,, ,,,...
Page 44 - Mounting procedure for MODEL 841; ) Unfasten the four fixing bolts securing; ) Prepare and fasten a platform of 5 to
33 Mounting procedure for MODEL 841 Removing packing materials 1) Open the radome cover carefully. Re- move mounting hardware at the bottomof the radome base assembly; four eachof M10 bolts, spring washers and flatwashers. This hardware may be dis-carded; do not use them to fix the an-tenna unit to ...
Page 45 - Figure 5-9 How to fasten the radome base
34 5) Make sure the vent tube is in the correct position, and then fasten the radome baseto the mounting platform with four eachof M10 x 20 hex bolts, flat washers andspring washers (supplied). Do not over-tighten the bolts; the tightening torqueshould be between 200 and 250 kg cm. ,,,,,, ,,,,,, ,,,...
Page 47 - Display Unit Installation
36 5.2 Display Unit Installation Mounting considerations When selecting a mounting location for thedisplay unit keep in mind the followingpoints. • The display unit is designed and con- structed to be splashproof, thus it can beinstalled outdoors. You can even hose itdown after a day’s outing. If it...
Page 48 - Cutting size for flushmount; Figure 5-13 How to mount the display unit
37 *140 (5.51") 10 (0.39") 238 (9.37") 18 (0.71") 18 (0.71") *80 (3.15") *80 (3.15") 100 (3.94") 20 (0.79") 274 (10.79") 130 (5.12") 4 - ø6 FIXING HOLES * :SERVICING CLEARANCE 10mm 222(8.7") 236(9.3") Cutting size for flushmount Figure 5-13 How to ...
Page 49 - Connections
38 Connections Connect the signal and power cables, theground wire and optional equipment asshown in Figure 5-14. Figure 5-14 Display unit, rear view RP HDG NMEA DJ-1 OPTION MARINE RADAR TYPESER.NO.DATECOMPASS SAFE DISTANCESTD M STEER M EQUPMENT CLASSFURUNO ELECTRIC CO., LTD 10.2-31.2VDC 3 GND 1 2 S...
Page 50 - Figure 5-15 How to connect external; Heading Sensor Connection; The OPTION connector
39 SPU-9180 DISPLAYUNIT J61 VIDEO SOUNDER Cable suppliedwith radar(connector assy.03-1796(5)) Cable suppliedwith video sounder Solder andtape. Figure 5-15 How to connect external equipment to the OPTION connector 3) Cover signal cable at junction with dis- play unit with silicone sealant. Distributi...
Page 51 - Installation Check List
40 5. Add jumper wire between J55 pin #3(RXD-H) and J61 pin #1(TXD-H). 6. Add a jumper wire between J55 pin #4(RXD-C) and J61 pin #5(SHIELD). JP3 JP4 CR14 R90R91 R93R94 Q15 R95Q16 R92 R91 Add the jumper wire between J61#1 and J55#3. Add the jumper wire between J61#5 and J55#4. J61 5 1 4 3 J55 R69 C2...
Page 52 - Initial Adjustment of Picture; Figure 5-16 Display for adjustment of; ) Turn on the power while pressing and; Figure 5-17 main menu
41 ❒ Are all connectors at the rear of thedisplay unit fastened securely? CAUTION If it is necessary to open the display unit, be surethe rear cover is fitted to the front chassisproperly when closing the rear cover. Whenreassembling, first turn off the unit and thenpress the center of the rear cove...
Page 53 - Figure 5-18 Installation setup menu 1; Figure 5-19 Installation setup 2 menu; Entering Initial Settings; INSTALLATION SETUP 2; Figure 5-20 Installation setup 2 menu
42 3) Press the cursor pad to select Installa- tion Setup 1 and press the [ENT] key. ● INSTALLATION SETUP 1 ● Select item and optionby ▲▼ keys. 1. Key Beep2. Hdg Sensor3. Ant on Tx4. Demo Display5. Antenna Unit6. Installation Setup 2 . . . . . . . . . . . . . . . . . Press HM-OFF to temporarilyhide ...
Page 55 - Signal cable connection; Connect the signal cable to DJ-1 on the
44 5.10 Signal cable connection 1. Connect the signal cable to DJ-1 on the rear panel of the display unit. Rubber cover DJ Connector Boot-band Cable Display unit DJ-1 2. Cover the connector with the rubber cover. The projection on the connectorbase is inserted into the groove on therubber cover. Dis...
