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Furuno 1834C-BB Radar Detector User Manual

1. Covered not use HDG connector Power cable connector Connect heading Connect power sensor nere cable here NMEA connector Connect navaid nere OPTION connector 7 Connect navaid MARINE RADAR video sounder etc Signal cable connector here Connect signal cable EN from antenna here cuss Ground terminal Connect ground wire between here and ship s ground N CAUTION Tigthen the boot boud securely to ensure watertightness See page 44 Figure 5 14 Display unit rear view 38 Navigation aid video sounder connection If your navigation aid can output data in NMEA 0183 data format your vessel s po sition in latitude and longitude the range and bearing to waypoint speed and course may be input to this radar and be seen in the bot tom text area Further if your video sounder can output depth in NMEA 0183 data format depth can be displayed on the navigation data dis played in graph form during stand by You will need an NMEA cable For navaid Type Code no Remarks MJ A6SPF0012 050 000 134 424 6P 6P 5m MJ A6SPF0012 100 000 133 817 6P 6P 10m For E S Type Code no Remarks MJ A6SPF0011 050 000 132 224 6P AP 5m MJ A6SPF0011 100 000 132 336 6P AP 10m Two NMEA connectors are provided at the rear of the display unit the NMEA connec tor and the OPTION connector Heading Sensor Connect
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4. Figure 2 5 Display for adjustment of brilliance and tone 2 Press the BRILL key or TONE key to set level For fine adjustment press cursor pad at 120 clock 6 o clock for bril liance and 3o0 clock 9o clock for tone 2 7 Adjusting Control Panel Brilliance Procedure 1 Press the MENU key 2 Press the cursor pad to select Backlight Brilliance and press the ENT key 3 Press the cursor pad to select Panel 4 Press the cursor pad to select brilliance level 4 1s the highest 5 Press the ENT key followed by the MENU key 2 8 Adjusting GAIN 5 The ECHO key enables adjustment of the gain STC RAIN and FTC 1 Press the ECHO key The following dis play appears AUTO 2 3 Item selected for adjustment GAIN STC 238 A C 00 FTC 0 2 12 ECHO KEY TO EXIT Current level Figure 2 4 Display for adjustment of GAIN STC A C RAIN and FTC 2 Press the cursor pad to select item to ad just Current selection is circumscribed by dashed rectangle 3 Press ENT 3 Press the cursor pad to set level 4 Press the ECHO key to finish How to adjust the gain sensitivity The gain works in precisely the same man ner as the volume control of a broadcast re ceiver amplifying the signals received You can adjust the gain automatically or manually For manual adjustment adjust the sensit
5. HP NP x AR OU eom 3NINVM am waona to avoiy ew o TIE EE 2770 ph Le 77 995 ZAHN y 6241496 d V 1300W VApsy rv p 4650 adAl Ana 691 G 0996 H 04 4 09 gt pie 9 UY i X t ro i LOION 1 u Li TNE 2 TT 9141 4029 D 6 0995001 D 8 48 40 27 nc DL 89 26 09 011 52 gt l esf C Pon i 2 1 O B gt gt NND y 1 4 enl fs EN i b E oo E ME 60 38 gt AUD i 81 92 X DNINVSH gt FD 9 rH nig 1 4 99 gt X 7 E MEN 9 Mee 00 gt 818 LEA XOW H ZT gt I 6 n 10912 2 ATL p ST gt 0 1 gt 5 9 22 tede owl bog Pod tee Eee He gt OT Wy L3 02 t 26 gt E 29 p GND E 0821 fy QN 92 YX M NIV UT 2 04 39 5 a IHM B Y3S 2 Y 9 n s 1 ET qp gt t a E p 22 gt Ls i AZIZ
6. CURSOR 0 675nm 240 1 R 0 646 nm 308 72 Figure 2 18 Sample nav data display Setting up the nav data display 1 Press the MENU key 2 Select Nav Data and press the ENT key NAV DATA MENU Select item and option by keys 1 Navigator ALL GPS LC 2 Nav Data Diso OFF ON 3 Pos Disp Mode L L TD 4 Depth Unit M FA FT 5 Temp Unit F 6 STBY Display NORM NAV Press HM OFF to temporarily hide menu lt Press MENU for main menu gt Figure 2 19 Nav data menu 3 Select Navigator GPS Loran C or ALL Select all if several navigators are con nected to the radar In this case position data 15 selected in order of GPS Loran and other 4 Select Nav Data Disp to OFF or ON 5 Select Pos Disp Mode to L L latitude and longitude or TD Loran 6 Select unit of depth measurement to meters fathoms or feet 7 Select unit of measurement for water tem perature to Centigrade or Fahrenheit 8 Select whether to display nav data or ST BY NORM for stand by NAv for navigation data 9 Press the ENT key followed by the MENU key 2 23 Echo Stretch magnifying long range echoes Normally the reflected echoes from long range targets appear on the display as weaker and smaller blips even though they are com pensated by the radar s internal circuitry To stretch long range echoes in the range di rection turn on the echo stretch function Distant echo Echo s
7. Heading marker Targets Range and bearing of a target relative to own ship are readable on the Own ship in center Own ship radar A Bird s eye view of situation B Radar picture of A Figure 1 1 How radar works 2 2 1 Control Description Cursor pad Shift cursor VRM and EBL select items and options on menu Registers selection ENT Opens closes menus on menus Press to adjust gain Erases heading marker A C RAIN STC selects cursor data Lat Long R B and FTC outputs cursor position Selects radar range Adjusts display Adjusts display brilliance tone Turns the EBL EBL VRM Turns the VRM on off on off Plots targets trails Turns the range rings on off OFF Sets guard Off centers zone area the display DISP ST BY P Selects display mode Sets radar in stand by erases heading error transmits radar pulse indication Turns power on off Figure 2 1 Control panel 2 2 Display Indications and Markers Heading requires heading data Range Range ring interval HDG 326 8 Presentation mode CU ipea Off center T SD SP SN SN Heading marker Guard zone area Cursor EBL VRM EBL 0 675 220 9 range bearing Cursor range Echo trail AUTO tuning Echo trail elapsed time Guard zone Fast Time Constant rain clutter suppressor Echo stretch Interference rejector Range ring
8. EN Umm SNOISN3AWIG 40 S3IVOIONI 1 LINN AVTdSIC aww 310N XS Elda Y ANOS S 2 34 MH Sch IRURE 1 Ka uidi SLRS AY 0247 7 f f 2 V4 fof m4 gt 2 ni 4 2 7 7 2 7 B 2 2 2 2 2 7 9S m gt 7 i 7 ZI 7 2 ZB 2 2 4 P4 084 992 08 5 8 _ E L BAFL AMRUES ET 20 EFF THREAD LENGTH SCANNER BASE PLATE J2vybhk A PLATFORM SR UM HEX BOLT SCALE 1 4 7757 CABLE GLAND 24 10 FIXING HOLES 1 TABLE 1 TED mm 4x 25 mm DIMENS 108 TOLERANCE 0 lt 1 112 2 50 lt 2 BAF 2 7RU7 7 2772 _100 lt 1 3 AZ AAAE amp EIBBERX2ITLRS 52 TABLE 2 NOTE 1 TABLE 1 INDICATES TOLERANCE OF DIMENSIONS Eta 1 5 2 VENT TUBE AND CABLE GLAND ARE FITTED AT FACTORY 7 1 3 TABLE 2 INDICATES COMPASS SAFE DISTANCES STEERING _ LIM TT RSB 0028K 0054 0067 HECKED E Jue ze ch 2 a siis e ERRE 775 216 09 __ MODEL 821 yt Ed SCALE MASS 210 1 5 4 5 ANTENNA UNIT 63309 008 G OUTLINE DRAWING FURUNO ELECTRIC CO
9. M10X25 SUS304 ERER m FLAT WAS HER 000 864 131 M10 505304 000 864 261 SPRING WASHER 03 1796 5P CONNECTOR ASSY Ds 503 50 SIGNAL CABLE 000 846 283 0359148 3 54 SD 1 3 5 POWER CABLE Either of the following signal cables is available 000 129 613 EE 000 549 064 ACCESSORIES 9X20 SUS 304 000 802 081 TAPPING SCREW INSTALLATION MATERIALS SUS304 4 Storied SUS304 FLAT WASHER a E 10 25 505304 SPRING WASHER 000 864 261 r 03 1796 5P CONNECTOR ASSY 13 000 846 283 503 51 1 0359148 3 5M amp 1 3 5a 000 129 513 Either of the following signal cables is available Type Code no Remarks Type Code no Remarks 503 60 05 008 462 000 5 3 16300 503 61 10 008 462 060 10 503 60 10 008 462 010 10m CP03 16310 503 61 15 008 462 070 15 503 60 15 008 462 020 15m 16320 503 61 20 008 462 080 20 503 60 20 008 462 030 20m CP03 16330 503 61 30 008 462 090 30 503 60 30 008 462 040 30m CP03 16340 Installation materials can be supplied without the signal cable 16350 vii CONFIGURATION MODEL 821 841 Antenna Unit MODEL 821 MODEL 821 841 __ Remote Display FMD 811 Video Sounder FE Fluxgate Heading 2 External Alarm Sensor C 2000 Gyro Converter 7 AD 00 7 Buzzer OP
10. 12 3 16 4 24 6 4 Bearing resolution 6 27 5 Bearing accuracy Better than 1 6 Range discrimination Better than 25 m 7 Rangering accuracy amp discrimination 0 9 or range in use or 8 m whichever 1s larger Minimum range Better than 37 m 9 Markers Heading marker Bearing scale Range ring VRM EBL Waypoint option Tuning indicator Alarm zone Cursor 10 Alphanumeric indication standard Electronic Bearing Line EBL Echo Stretch ES Rain Clutter Rejection FTC Alarm G Interference Rejection IR Stand by ST B Y Echo Trail Time TRAIL Variable Range Marker VRM Range Range Ring Interval Range and Bearing to Cursor Off Center OFF CENTER Watchman WATCHMAN 11 12 13 14 15 16 17 With navigation input option Course CRS Latitude and longitude Speed SPD Range and bearing to waypoint WP Cross Track Error XTE Date and time Water depth Water temperature This radar has only two data input ports To receive data from more than two equipment install an mixing device Vibration Vibration freq Total amplitude 5 to 12 5 Hz 1 6 mm 12 to 25 Hz 0 35 mm 25 to 50 Hz 0 10 mm Ambient Temperature Antenna unit 20 C to 70 C Display unit 0 C to 60 C Due to the inherent nature of the LCD its contrast may be affected under ambient temperature below 0 32 F or above 50 C 122 F Humidity Relative humidity 95 or less at
11. 40 C Waterproofing Display unit EC Pub no 529 IPX5 Antenna unit IEC Pub no 945 class X Power supply amp power consumption 12 V or 24V 10 2 V to 31 2 V DO 40 W approx Protection features Protection against reverse polarity overvoltage overcurrent and internal fault Compass safe distance Standard Steering compass compass SPECIFICATIONS MODEL 841 Antenna Unit 1 Radiator Printed array 2 Radiator length 54 cm 3 Horizontal beamwidth 49 4 Vertical beamwidth 25 5 Sidelobe 20 dB within main lobe 23 dB outside main lobe 6 Polarization Horizontal 7 Antenna rotation speed 24 rpm 8 Windresistance Relative wind speed 100 kts 51 5 m s Transceiver Module contained in radome 1 Transmitting tube Magnetron MG5248 2 Frequency 9410 MHz 30MHz PON X band 3 Peak output power 4 kW 4 Pulselength amp pulse repetition rate 0 08us 2100 Hz 0 25 0 5 0 75 nm 0 3us 1200 Hz 1 1 5 2 nm 0 8 5 600 Hz 3 4 6 8 12 24 36 nm 5 Warm up time 2 30 6 Modulator switching method FET 7 LF 60 MHz Tuning Automatic or manual 9 10 11 Receiver front end MIC Michoeave IC bandwidth 7 MHz Duplexer Circulator with diode limiter Display Unit 10 Indication system PPI raster scan Display 8 inch diagonal LCD STN semi transparent yellow mode Range scales nm Range Ring Interval 0 125 0 0625 0 25 0 125 0 5 0 125 0 75 0
12. 73 i EN R93 015 OO R95 R91 spa R92 beo T R91 and R92 Add jumper wire between J55 pin 3 RXD H and J61 pin 1 TXD H Add a jumper wire between J55 pin 4 RXD C and 761 pin 5 SHIELD Add the jumper wire between J61 5 and J55 4 40 eec 916 ree Add the jumper wire between J61 1 and J55 3 Connect the NMEA cable to the con nector assy 03 1796 5P supplied with radar as shown in the figure below Connect the connector to J51 on SPU Board MODEL 821 841 FMD 811 BRN RD C VEL GP 9 Replace the covers removed in step 1 10 Connect navaid and other equipment to radar 11 Turn on the radar and confirm that NAV data in properly received at the radar and external equipment 5 3 Installation Check List After completing the installation it is a good idea to check for proper installation Follow the checklist below and tick boxes to show proper completion J Is the vent tube on the antenna housing g g on the stern side Are the four bolts for fixing the radome tightened Is the signal cable waterproofed at the radome base Is the signal cable secured against a mast or bulkhead Is the cable gland or cable entry on the deck fully waterproofed Are the connections to the battery of correct polarity Are all the antenna and display units grounded Solder 03 1796
13. LTD DWG No FURUNO 275 65 SCANNER BASE PLATE PLATFORM 27 VENT TUBE V 84317 286 HOLE OF 49 20 ON PLATFORM 160 20 OREM Ale ITE SHIP S BOW NS EPA os 825 T FABAO 25 CABLE ENTRY lt gt 4 M10 FIXING HOLES NOTE 1 VENT TUBE IS FITTED AT FACTORY AFIT kB IER A A NOTE 2 COMPASS SAFE DISTANCE FCR 1010 FR 7010D STANDARD MODEL 1730 1731 1830 1831 STEERING 1 75m AFP YT ri 8 5 m REMARKS MODEL 1730 1731 1830 1831 MARK 2 MODEL 84 Javed d 7 jC THIRD ANGLE PROJECTION TITLE 7 Zech ERA RADAR SCANNER UNIT 77 R m CHECKED 52770 SCALE 1 6 TH JN DRAWN HATA WEIGHT 8 FURUNO ELECTRIC LTD 79 2 APPROVED Bes GNE C3319 006 J NOII93NNOOU3INI Pessed q eq ueo pereu poneo 19 pHSST seq Jedunf ow Bund Ag 1 310N amp nme Ion 6 15 7 ALA REh MAAAEEZOIN 95 a Xceossr 1a H3ZZh8 2 2 HALLO m e c U Ww GA we ux GR CS FU Ge UR Um
14. Press MENU for main menu Figure 5 19 Installation setup 2 menu 5 6 Entering Initial Settings 1 At the Installation Setup 1 menu press the cursor pad to select Key Beep Key Beep turns on or off the buzzer which sounds when a key is pressed 2 Press the cursor pad to select OFF or ON 3 Select Hdg Sensor 4 Selecttype of heading sensor connected to the radar MAGnetic compass or GYROcompass 42 5 Press the ENT key Leave the menu open to complete the next several adjustments 5 7 Relative Bearing Alignment You have mounted the antenna unit facing straight ahead the direction of the bow Therefore a small but conspicuous target dead ahead visually should appear on the heading mark zero degrees In practice you will probably observe some small error on the display because of the dif ficulty in achieving accurate initial position ing of the antenna unit The following adjustment will compensate for this error up to 360 degrees 1 Identify a suitable target for example ship or buoy at a range between 1 8 to 1 4 miles preferably near the heading mark To minimize error keep echoes in the outer half of the picture by changing the range 2 Display the Installation Setup 2 menu INSTALLATION SETUP 2 Select item and option by trackball 1 Align Heading 2 Adjust Sweep Timing 3 Hours 000019 8 4 Tx Hours 000016 0 H Press HM OFF to temporarily hide men
15. Range and bearing to cursor or cursor position in latitude and longitude may be displayed by pressing the HM OFF key Cursor bearing Figure 2 2 Display indications 2 3 Turning the Radar On and Off Turning the radar on Press the POWER key to turn the radar on or off The control panel lights and a timer displays the time remaining for warm up of the magnetron the device which produces radar pulses counting down from 2 30 MODEL 841 1 30 MODEL 821 to 0 01 Note When the power is reapplied within a certain amount of time and circuits remain charged the warmup process is skipped you can transmit immediately The radar antenna emits high frequency radio radiation which can be harmful particularly to your eyes Never look directly at the antenna from a distance of less than two feet when the radar is in operation Always make sure no one is near the antenna before turning on the radar Note When the heading signal is lost the HDG readout at the top of the screen shows This warning stays on when the heading sig nal is restored to warn the operator that the readout may be unrealiable The warning may be erased by pressing the DISP MODE key echo trail time tuning indicator 2 4 Transmitting After the power is turned on and mag netron has warmed up ST BY Stand By appears at the screen center This means the radar 1s now fully operational In stand by the radar 1s available f
16. b I2 t 92 4 52 523 xc 9 t tg ISET ti B 42 t xeu 11 AZOZ OtI 6 06 woe 05 09 80 wog 02 09 205 6 1 91 09 205 01 09 50 6 60 09 05 LINN NSNNYOS te BE ch Sc LINN AVIdSIG Od 01 1 AWN i 8U 1 EEA mannanna C snos F OIVAVN gt 5 00 HOSN3S J ONIQV3H e 0002 0 L ESEP 8716560 _______________________________________ 0008 04 1 aly 1 GIVAVN J 08 84 1 YJ Res LIE PLE E diio 2809 05 1 OV AOEZ 02C OTT OOT Li i a 1 b L P 1 V 1 90 Ac 18 C OT 4 HS 26 28 gt 4 29 gt gt Tt9f gt 2081 gt T 26 8 5 9 8 t 6 108721 LINN YENNVOS 2 WYYOVIO NOILO3NNOOU3INT 0 1TT09 62T 0 2 18008 OL 818 21144 gjVQVH INT L 26 adAl t D gt 144 INAL ny 208 O3GIA E AND awnoss 5
17. 21 2 Men Operat 9 2 13 Selecting the Display Mode 11 2 14 Window Display 12 2 15 Selecting the Presentation Mode 12 Card LATIN 13 2 17 Suppressing Radar Interference 14 2 18 Suppressing Noise Interference 15 2 19 Selecting Pulselength 15 2 20 Off Centering the Display 15 2 2 Echo o 16 2 22 The Navigation Data Display 16 222 ECHO STECH a a 17 2 24 Selecting Unit of Measurement MENS 18 2 25 Selecting Bearing Reference 18 2 20 Wate irati 18 2 27 Erasing the Heading Marker 19 2 28 Deselecting Ranges 19 2 29 Displaying Navigation Data During Statid DYy3 19 2 30 Outputting Cursor Position to INQUIS OI sacl ar R 20 2 3 Displaying Cursor Position Range and Bearing to Cursor 20 2 32 Visual Alarm Indications 20 3 INTERPRETING THE DISPLAY 3 The Radar Wave and Radar Horizon 21 3 2 Target Properties and Radar Wave Reflection 21 3 3 Range Resolution 22 3 4 Bearing Resolution 22 gt gt False Echo ouis cient eo dio vo EUIS bi die 22 3 6 Nautical Chart and Radar Picture 24 4 MAINTENANCE amp TROUBL
18. 25 1 0 25 1 5 0 5 2 0 5 3 1 4 1 6 2 8 2 12 3 16 4 24 6 36 6 Bearing resolution 6 2 Bearing accuracy Better than 1 Range discrimination Better than 25 m Range ring accuracy amp discrimination 0 9 or range in use 8 m whichever 1s larger Minimum range Better than 37 m Markers Heading marker Bearing scale Range ring VRM EBL Waypoint option Tuning indicator Alarm zone Cursor Alphanumeric indication standard Electronic Bearing Line EBL Echo Stretch ES Rain Clutter Rejection FTC Alarm G Interference Rejection IR stand by ST B Y Echo Trail Time TRAIL Variable Range Marker VRM Range Range Ring Interval Range and Bearing to Cursor Off Center OFF CENTER Watchman WATCHMAN 11 12 13 14 15 16 With navigation input option Course CRS Latitude and longitude Speed SPD Range and bearing to waypoint WP Cross Track Error XTE Date and time Water depth Water temperature This radar has only two data input ports To receive data from more than two equipment install an mixing device Vibration Vibration freq Total amplitude 5 to 12 5 Hz 1 6 mm 12 to 25 Hz 0 35 mm 25 to 50 Hz 0 10 mm Ambiont temperature Antenna unit 20 C to 70 C Display unit 0 C to 60 C Due to the inherent nature of the LCD its contrast may be affected under ambient temperature below 0 32 F or above 50 C 122 F
19. EBL 1 Press the key to display the 2 Press the cursor pad to bisect the target with the EBL The cursor appears and is linked with the EBL allowing you to measure both bearing and range to the target 3 Check the EBL readout at the bottom left hand corner of the display to find the bear ing to the target Note The EBL is automatically anchored when no cursor pad key is operated within about 10 seconds To erase the EBL press hold down the key for about three seconds 1 77 gt NE TM TUE PS TN vA 1 do CURSOR 0 675 300 1 R EBL 300 1 R bearing Figure 2 9 Measuring bearing by the EBL Tips for measuring the bearing Bearing measurements of smaller targets are more accurate the center of larger tar get echoes 15 not as easily identified Bearings of stationary or slower moving targets are more accurate than bearings of faster moving targets To minimize bearing errors keep echoes in the outer half of the picture by chang ing the range scale angular difference be comes difficult to resolve as a target approaches the center of the display Target on collision course with your vessel You can determine if a target might be on a collision course with your vessel by placing the EBL on the target If it
20. FURUNO OPERATOR S MANUAL MARINE RADAR MODEL 821 841 FURUNO ELECTRIC LTD NISHINOMIYA JAPAN FURUNO ELECTRIC CO LTD 9 52 Ashihara cho Nishinomiya Japan Telephone 0798 65 2111 Telefax 0798 65 4200 All rights reserved Printed in Japan PUB No OME 34160 YOSH MODEL 821 841 Local Agent Dealer FIRST EDITION AUG 1995 G JAN 11 2001 00080734500 N SAFETY INFORMATION Safety Arrangements 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 1 true if the following precautions are met Each piece of equipment is grounded to an adequate grounding terminal or the ship or any mobile unit which carries the equipment The grounding line should be as short as pos sible A WARNING Hazardous voltages Can shock burn or cause death Only qualified person nel should work inside the units of the radar Electrical Shock Hazard This equipment contains high voltages which can cause severe in jury or death Any installation internal adjustment servicing and repair must be performed by qualified service personnel totally fa miliar with electrical circuits and servicing of the equipment Ground both the Display Unit and the Antenna Unit Both the display unit and the antenna unit must be grounded An un grounded unit
21. Select minimum range Press the ECHO key and press the cursor pad to select STC AUTO if itis not already se lected 5 5 Displaying the Installation Menus Two sets of installation menus Installation Setup 1 and Installation Setup 2 enable en try of initial settings and adjustment of the radar Procedure 1 Turn on the power while pressing and holding down the HM OFF key 2 Press the MENU key MAIN MENU 6 Select item by keys and press ENT key Backlight Brilliance P L IR NR amp Radar Mode Nav Data Mode amp Function MANUAL Tuning Self Check Installation Setup 1 Press HM OFF to temporarily hide menu Press MENU key to escape Figure 5 17 main menu 41 3 Press the cursor pad to select Installa tion Setup 1 and press the ENT key INSTALLATION SETUP 1 e Select item and option by keys 1 Key Beep 2 Hdg Sensor 3 Ant on Tx 4 Demo Display OFF ON MAG QGYRO ROTATE STOP OFF ON 5 Antenna Unit M841 MK2 841 6 Installation Setup 2 Press HM OFF to temporarily hide menu Press MENU for main menu Figure 5 16 Installation setup menu 1 4 To display the Installation Setup 2 menu press the cursor pad to select Installation Setup 2 INSTALLATION SETUP 2 0 Select item and option by trackball 1 Align Heading 2 Adjust Sweep Timing 3 On Hours 000019 8 H 4 Tx Hours 000016 0 H Press HM OFF to temporarily hide menu
22. as separate tar gets the echoes received from two targets which are at the same range and are close together The principal factor which affects bearing resolution 15 horizontal beamwidth Two tar gets at the same range must be separated by more than one beamwidth to appear as sepa rate pips Radar is able to display two Target distinct target echoes Horizontal beamwidth CO Direction of scanner rotation Target Horizontal beamwidth Direction of scanner rotation Radar cannot display targets as separateechoes because they are within the beamwidth Figure 3 3 Bearing resolution 3 5 False Echoes Occasionally false echoes appear on the screen at positions where there is no target In some cases the effects can be reduced or eliminated The operator should familiarize himself or herself with the appearance and effects of these false echoes so as not to confuse them with echoes from legitimate contacts Multiple echoes Multiple echoes occur when a short range strong echo is received from a ship bridge or breakwater A second a third or more ech oes may be observed on the display at double triple or other multiples of the ac tual range of the target as shown in Figure 3 4 Multiple reflection echoes can be re duced and often removed by decreasing the sensitivity or properly adjusting the STC True echo gm pr Target Gwn snp Multiple echo Figure 3 4 Multiple echoes Side lo
23. can cause electrical shock when its metallic parts are touched and receive or give off electromagnetic interference Useable Environment This radar 1s designed and manufactured to be used on board marine ves sels Use in other environments may cause interference to other equipment TABLE OF 5 FOREWORD SPECIFICATIONS EQUIPMENT LIST vii CONFIGURATION viii 1 PRINCIPLE OF OPERATION 1 LAW That 1S Radar 1 1 2 How Ships Determined Position Before uni 1 1 3 How Radar Determines Range 1 1 4 How Radar Determines Bearing 1 1 5 Radar Wave Speed and Antenna Rota HONS DCEO 1 1 6 The Radar Display 1 2 2 1 Control Description 3 2 2 Display Indications and Markers 4 2 3 Turning the Radar On and Off 4 5 2 5 Selecting the Range 5 2 6 Adjusting LCD Backlighting and Display uin 5 2 7 Adjusting Control Panel Brilliance 5 2 8 Adjusting GAIN STC RAIN and 2 9 Tuning the 7 2 10 Measuring the Range 9 2 11 Measuring the Bearing 9
24. maintenance or troubleshooting procedure 25 4 2 Preventative Maintenance Regular maintenance 1 important for good performance Always keep the equipment as free as possible from dirt dust and water splashes Make sure all screws securing the components are properly tightened A maintenance program should be estab lished and should at least include the items listed in Table 4 1 4 3 Replacing the Fuse The 5A fuse in the power cable protects the equipment against reverse polarity of ship s mains overcurrent and equipment fault If the fuse blows find the cause before replac ing it Never use a fuse rated for more than 5A serious damage to equipment may re sult and void the warranty Table 4 Recommended maintenance program to 6 Fixing bolts Check for tightness and Replace corroded bolts Coat months for antenna corrosion bolts with anti corrosive sealant unit Radome cleanliness Foreign material on the radome face will cause a considerable drop in performance Clean the radome with a freshwater The only recommended cleaning agent is alcohol Do not use other cleaning agents they can remove paint and markings If a crack is found it should be temporarily repaired by using a small amount of sealing compound or adhesive You should then contact your dealer for service Check for wear Permanent damage to the antenna s internal circuitry will result if water leaks into the radome Radom
25. of the marine en vironment However no machine can per form its intended function unless properly installed and maintained Please carefully read and follow the recommended proce dures for installation operation and main tenance While this unit can be installed by the pur chaser any purchaser who has doubts about his or her technical abilities may wish to have the unit installed by a FURUNO rep resentative or other qualified technician The importance of a thorough installation can not be overemphasized We would appreciate hearing from you the end user about whether we are achieving our purposes Thank you for considering and purchasing FURUNO equipment Features Your radar has a large variety of functions all contained in a remarkably small cabinet The main features of the MODEL 821 MODEL 841 are Traditional FURUNO reliability and quality in a compact lightweight and low cost radar e Smartly styled light weight and compact radome antenna fits even on small yachts e Durable brushless antenna motor High definition 8 LCD raster scan dis play e On screen alphanumeric readout of all operational information e Standard features include EBL Elec tronic Bearing Line VRM Variable Range Marker Guard Alarm Display Off Center and Echo Trail Watchman feature periodically transmits the radar to check for radar targets which may be entering or exiting the alarm zone e Operates
26. on 10 2 to 31 2 DC power supply and consumes about 40 W e Ship s position in latitude and longitude or Loran C Time Differences range and bearing to a waypoint ship s speed head ing and course can be shown in the bot tom text area Requires a navigation aid which can output such data in NMEA 0183 format e Zoom feature provided 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 Transceiver Module contained in radome 1 Transmitting tube Magnetron E3587 2 Frequency 9410 MHz 30MHz PON X band 3 Peak output power 2 kW 4 Pulselength amp pulse repetition rate 0 1215 2100 Hz 0 25 0 5 0 75 nm 0 3us 1200 Hz 1 1 5 2 nm 0 8 600 Hz 3 4 6 8 12 24 nm 5 Warm up time 1 30 6 Modulator FET switching method 7 LF 60 MHz 8 Tuning Automatic or manual 9 Receiver front end MIC Microwave 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 0 125 0 75 0 25 1 0 25 1 5 0 5 2 0 5 3 1 4 1 6 2 8 2
27. our sole responsibility that the product LCD radar Model 821 for recreational crafts Serial No 3319 0002 and R059 0002 Model name serial number is in conformity with the essential requirements as described in the Directive 1999 5 EC of the European Parliament and of the Council of 9 March 1999 on radio equipment and telecommunications terminal equipment R amp TTE Directive and satisfies all the technical regulations applicable to the product within this Directive EN 60945 1997 01 IEC 945 Third edition 1996 11 KSH 142 Annex 1 tile and or number and date of issue of the standard s or other normative document s For assessment see Statement of Opinion 00214113 AA 00 of 28 November 2000 issued KTL Certification The Netherlands Testreport Telefication 963034 of 5 April 1996 and Telefication 953257 of 21 March 1996 On behalf of Furuno Electric Co Ltd tam SZ 21277 itty Hiroaki Komatsu Nishinomiya City Japan Manager December 28 2000 International Rules and Regulations Place and date of issue name and signature or equivalent marking of authorized person
28. outward Figure 5 21 Examples of improper and correct sweep timings 1 Transmit the radar on the shortest range and adjust the sensitivity and 5 2 Visually select a straight echo harbor wall straight pier 3 Display the Installation Setup 2 menu and select Adjust Sweep Timing 5 While looking at the target selected at step 2 press cursor pad at the 9 o clock or3 o clock position to straighten the tar get 6 Press the ENT key 5 9 Closing the Installation Menus Press the MENU key and turn off the power Table 5 1 Voltage ratings reference for installer MODEL MODEL 821 841 Magnetron P804 5 1 7 2 1V TP803 5 0 9 1 1V Tx long current range Magnetron heater voltage TP804 6 7 9 8 1V TP803 4 7 4 7 6V Stand by qme 7 7 9 8 9V 803 1 290 330V 2 Target pushed 3 Target pushed 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 1s inserted into the groove on the rubber cover Rubber cover Grasp lt Display unit 3 Putthe boot band as shown below and tighten it Boot band Display Unit 44 171 703 2154123973 ONIMVYC 3 111010 09 0001 621 60 39NVHV31O 391AM3S Q3O0N3AWOO3UN
29. targets Coastline lt difficult to display Radar display Actual topography Figure 3 8 Nautical chart and associated radar picture 4 amp TROUBLESHOOTING This chapter tells you how to keep your ra dar in good working order Before review ing this chapter please read the safety information which follows 4 1 Safety Information ELECTRICAL SHOCK HAZARD A WARNING This equipment uses high voltage electricity which can shock burn or cause death While the equip ment has been de signed with consideration for the operator s safety precautions must always be exercised when reaching inside the equipment for the purpose of maintenance or service For this reason only qualified personnel totally fa miliar with electrical circuits and service manual should work inside the display unit or scanner unit Hazardous voltages Can shock burn or cause death Only qualified person nel should work inside the units of the radar RF RADIATION HAZARD IN The radar scanner emits high fre 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 Operation as you could injure the cornea of your eyes Always make sure the radar is set to stand by or is turned off before start ing work on the scanner unit A Turn off the power before per forming any
30. the size of the area se lected by the operator and wide range up compresses and displays the entire radar pic ture on the next higher range Note he zoom display does not function on the 0 125 and 0 25 nm ranges Selecting the type of window display 1 Press the MENU key 2 Select Mode amp Function and press the ENT key Note When you place the circle cursor behind the window display the window display shifts left or right so you may view the circle cursor 3 Select Window Display to Zoom or Wide range up 4 Press the ENT key followed by the MENU key Selecting the area for the zoom picture 1 Press the DISP MODE key to select the window display The area selector 15 a solid circle 2 Press the cursor pad to place the circle cursor area selector on the area to zoom 3 Press the ENT key The area selector becomes a dashed circle and the cursor can be moved indepedently To reselect area to zoom press ENT or DISP MODE and follow steps 2 and 3 12 Area selector 1 4 or 1 3 of range Window display area CURSOR VRM EBL CURSOR NM REE RO R kk kk NM ERRIKO R 1 Press DISP MODE 2 Press cursor keys to select the window to select area to zoom display and press ENT Figure 2 12 How to select the area to zoom 2 15 Selecting the Presentation Mode This radar provides four presen
31. to top left corner of zone and press GUARD Guard zone Drag cursor here 4 Guard zone completed 3 Drag cursor to bottom right corner of zone and press GUARD Figure 2 14 How to set a guard zone 14 precipitation As the level of these returns varies with environment the operator should properly adjust the STC gain sen sitivity A C RAIN and FTC to be sure the alarm system does not overlook tar get echoes 2 17 Suppressing Radar Interference Radar interference may occur when near an other shipborne radar operating in the same frequency band as your radar Its on screen appearance is many bright dots either scat tered at random or in the form of dotted lines extending from the center to the edge of the display Figure 2 15 illustrates interference in the form of curved spokes Interference effects are distinguishable from normal ech oes because they do not appear in the same place on successive rotations of the scan ner Figure 2 15 Radar interference Four levels of interference are available 1n cluding off IRI IR2 IR3 and OFF IR3 provides the highest level of rejection Procedure 1 Press the MENU key 2 Select P L amp Int Noise Rej amp ES and press the ENT key 3 Select INT REJECT 4 Select level desired 2 provides the great est degree of interference rejection 4 Press ENT and MENU IR and level selected appear at the top right corner on the disp
32. to deter mine the one way distance to the target This radar automatically takes this into account in making the range calculation 1 4 How Radar Determines Bearing The bearing to a target found by the radar 1 determined by the direction in which the radar scanner antenna is pointing when it emits an electronic pulse and then receives a returning echo Each time the scanner ro tates pulses are transmitted in the full 360 degree circle each pulse at a slightly differ ent bearing from the previous one There fore if one knows the direction in which the signal 15 sent out one knows the direction from which the echo must return 1 5 Radar Wave Speed and Antenna Rotation Speed Note that the speed of the radar waves out to the target and back again as echoes 1 ex tremely fast compared to the speed of rota tion of the antenna By the time radar echoes have returned to the scanner the amount of scanner rotation after initial transmission of the radar pulse is extremely small 1 6 The Radar Display The range and bearing of a target 15 displayed on what 15 called a Plan Position Indicator PPI This display is essentially a polar dia gram with the transmitting ship s position at the center Images of target echoes are received and displayed at their relative bear ings and at their distance from the PPI cen ter With a continuous display of the images of targets the motion of the transmitting ship is also displayed
33. warm up condition 2 27 Erasing the Heading Marker The heading marker continuously appears on the display and shows your vessel s head ing When this mark obscures a target echo you can temporarily erase it by pressing holding down the HM OFF key Release the key to redisplay the marker 2 28 Deselecting Ranges This radar has 14 15 MODEL 841 ranges some which you may not require You can deselect up to eight ranges as fol lows 1 Press the MENU key 2 Select Mode amp Function and press the ENT key 3 Select Range and press the ENT key Active ranges appear in reverse video 4 Press 4 or P to select range to disable or enable Current selection 1s under lined 5 Press ENT 6 Repeat steps 4 and 5 to disable or en able other ranges 7 When finished press the MENU key 2 29 Displaying Navigation Data During Stand by Various navigation data can be displayed during stand by A barometer is built in this radar atmospheric pressure appears in eraph form on the navigation data display during stand by If your navigation aid can output data in NMEA 0183 data format your vessel s position in latitude and longitude the range and bearing to waypoint speed 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 Further with video sounder input depth may be dis played both digitally and in graph fo
34. weaker echoes Vertical surfaces such as a cliff are good targets provided they face the radar Con versely horizontal and smooth surfaces such as mudbanks sandy beaches and gently sloping hills make poor targets because they disperse rather than reflect most of the en ergy that strikes them The strongest radar echoes known come from built up areas docks etc because these targets are less subject to changes in aspect These types of targets have three flat smooth surfaces mutually at right angles some radar buoys are arranged this way so as to deliberately increase their detection range 3 3 Range Resolution Range resolution is a measure of the capa bility of a radar to display as separate pips the echoes received from two targets which are on the same bearing and are close to gether The main factor which affects range resolu tion is pulselength Two targets on the same bearing close together cannot be seen as two distinct echoes on the display unless they are separated by a distance greater than one half the pulselength Radar is able to display two Transmitted distinct target echoes radar Target pulse x 4 1 Transmitted T radar arget pulse gt oe Radar cannot display targets as separate echoes because they are within the pulselength Figure 3 2 Range resolution 22 3 4 Bearing Resolution Bearing resolution is a measure of the capa bility of a radar to display
35. 0 seconds all but the latest one minute of trails are erased and then trailing continues 16 Continuous trail maximum continuous trail time 15 99 minutes and 59 seconds When the elapsed time clock counts up to that time the elapsed time display is reset to zero all trails are erased and then trailing 1s restarted Adjusting brilliance of afterglow The brilliance of the trails afterglow can be set on the Backlight Brilliance menu 1 Press the MENU key 2 Select Backlight Brilliance and press the ENT key 3 Select Echo Trails 4 Select brilliance 5 Press the ENT key followed by the MENU key Canceling echo trails Press the TRAIL key to erase the TRAIL indication 2 22 The Navigation Data Display Navigation data can be displayed at the screen bottom if this radar receives naviga tion input in NMEA 0183 format Naviga tion data includes position in latitude and longitude or Lo ran C time differences TDs bearing and range to a waypoint selected on the navigator cross track error XTE the amount in nautical miles and the direction the ves sel if off course depth speed If the navigation data include the destina tion data waypoint position is denoted on the radar display by a dashed ring 326 87 1 5 ESSES amp prp e yn VON 1 SN N 350 0m 0 05NML 30 0KT WAYPOINT POSI L L 12 0 45 09 66 04 OON VRM EBL 166 04 00
36. 03 136 Equivalent to 0183 Option ______________ Rectifier HP 62 __ e 115 230VAC 10 2 31 2VDC viii 1 PRINCIPLE OF OPERATION 1 1 What is Radar The term RADAR is an acronym mean ing RAdio Detection And Ranging AI though the basic principles of radar were developed during World War II primarily by scientists in Great Britain and the United States the use of echoes as an aid to navi gation is not a new development 1 2 How Ships Determined Position Before Radar Before the invention of radar when running in fog near a rugged shoreline ships would sound a short blast on their whistles fire a shot or strike a bell The time between the origination of the sound and the returning of the echo indicated how far the ship was from the cliffs or the shore The direction from which the echo was heard indicated the relative bearing of the shore 1 3 How Radar Determines Hange Radar determines the distance to the target by calculating the time difference between the transmission of a radar signal and the reception of the reflected echo It is a known fact that radar waves travel at a nearly con stant speed of 162 000 nautical miles per second Therefore the time required for a transmitted signal to travel to the target and return as an echo to the source is a measure of the distance to the target Note that the echo makes a complete round trip but only half the time of travel 15 needed
37. 5P NMEA cable Echosounder AM Gm A dm de o om A LO dc d d V RD i N C SHIELD f a tot D 3 TT e C N C SHIELD J Are all connectors at the rear of the display unit fastened securely CAUTION If it is necessary to open the display unit be sure the rear cover is fitted to the front chassis properly when closing the rear cover When reassembling first turn off the unit and then press the center of the rear cover to plug in the multipin connector on the rear cover 5 4 Initial Adjustment of Picture Follow the procedure below to obtain proper radar picture 1 Press the POWER key on the display unit The display should light Wait until the message ST BY appears on the screen About 1 30 for the 0821 and 2 30 for the 0841 2 Press TX ST BY key to transmit The radar will start transmitting and you will probably see some targets around you even though the radar 15 not yet properly adjusted 3 Select a long range 4 Press the ECHO key The following display appears Item selected for adjustment GAIN Es 2 3 STC 178 RAIN 00 0 2 1 2 level ECHO KEY TO EXIT Figure 5 16 Display for adjustment of gain STC A C RAIN and FTC 4 Press the cursor pad to select GAIN AUTO if it is not already selected 5
38. E pi Nd X vsso v i X aay NIV5 i E 530 B NIVA 9 V u E N35 GNI ANAL E IN 1 ot a XTH a h gt 8 X hOLOM IHA A ONTIV ag E a 5 E E TE 4 nig d 1 4 5 144 x 1 4 8 y WH 21 5 8 NYD LHM X r3 8 qgN LHA X annou gt 8 NYG LHM XH ACT e 8 540 1HM BH AZT r 1 a LLO AZO2 241 1 27 98Md 0 19 06 02 02 19 05 61 19 2065 wot 01 19 05 T7 102 217 9 980 ay BY d 681 25 2 0 gt 9 bz Aap 1 tc 03 E 1 XL 94 i 1 H XL gt t gt 2 9 1 lt G TZ gt Ze gt 40 28 0221 9191 40 2 9 277 Y gt 48 30 22 2 02 gt 831 1 1 6t Q9 J a 81 0S Qr ee 487 96 2 4 4 eee i 79 yr 01 T 9 kv rM Di 95 vaWN ssr 39 0 Diss 6 gt el STi 3 1 8 fa a
39. ESHOOTING 4 1 Safety Information 25 4 2 Preventative Maintenance 26 4 3 Replacing the Fuse 26 4 4 Troubleshooting 2 TES iiio 28 5 INSTALLATION 5 1 Antenna Unit Installation 20 5 2 Display Unit Installation 36 5 3 Installation Check List 30 5 4 Initial Adjustment of Picture 40 5 5 Displaying the Installation Menus 40 5 6 Entering Initial Settings 4 5 7 Relative Bearing Alignment 4 5 9 9 WeED MINE eee cn 42 5 9 Closing the Installation Menus 42 5 10 Signal cable connection 44 OUTLINE DRAWINGS D 1 INTERCONNECTION DIAGRAMS S 1 SCHEMATIC DIAGRAMS 5 3 Declaration of Conformity Congratulations on your choice of the FURUNO MODEL 821 MODEL 841 Ma rine Radar We are confident you will see why the FURUNO name has become syn onymous with quality and reliability For over 40 years FURUNO Electric Com pany has enjoyed an enviable reputation for innovative and dependable marine electron ics equipment This dedication to excellence is furthered by our extensive global network of agents and dealers Your radar 15 designed and constructed to meet the rigorous demands
40. Humidity Relative humidity 95 or less at 40 C Waterproofing Display unit EC Pub no 529 IPX5 Antenna unit IEC Pub no 945 class X Power supply amp power consumption 12 V or 24V 10 2 V to 31 2 V DO 40 W approx Protection features Protection against reverse polarity overvoltage overcurrent and internal fault Standard Steering compass compass 17 Compass safe distance Interface NMEA MODEL 821 841 Input Own ship s position RMA gt RMC gt GLL GLL 1s available Ver 5 and after speed RMA gt RMC gt VTG gt VHW Heading True HDT gt VHW gt HDG gt VHW gt HDM Heading Magnetic HDM gt VHW gt HDG gt VHW gt SHDM Course True RMA gt RMC gt VTG Course Magnetic VTG gt RMA gt RMC Waypoint L L Range Bearing RMB gt BWC gt BWR Loran time difference RMA gt GLC gt GTD Water depth DPT gt DBK DBS DBT Water temperature MDA gt MTW Time ZDA RMB gt XTE gt APB Output TLL On using HM OFF key RSD Acycle of four seconds vi EQUIPMENT LIST MODEL 821 RSB 0067 RDP 113 2 DISPLAY UNIT SPARE PARTS FGBO A 5 AC125Y MODEL 841 OUTLINE DESCRIPTION CODE No RSB 0059 049 RDP 113 4 1 250 i 255 DISPLAY UNIT SPARE PARTS FGBO A 5 AC125V 000 549 064 ACCESSORIES 20 5X20 SUS 304 777 TAPPING SCREW 000 802 000 802 081 INSTALLATION MATERIALS
41. Indirect echo Indirect echo path Heading mark True echo Bridge 2 2 7 z n Indirect Indirect echo echo Figure 3 6 Indirect echoes Blind and shadow sectors Funnels stacks masts or derricks in the path of antenna may reduce the intensity of the radar beam If the angle subtended at the scanner is more than a few degrees a blind sector may be produced Within the blind sector small targets at close range may not be detected while larger targets at much greater ranges may be detected See Figure 3 T Vessel taller than wharf Mast etc in path of radar beam Wharf Blind sector Size of blind sector depends on target size and range Figure 3 7 Blind and shadow sectors 24 3 6 Nautical Chart and Radar Picture Under normal conditions a picture which is similar to a nautical chart can be obtained on the radar display However a radar can not show targets which are below the hori zon show a target which is hidden by a larger one see around corners for example sea wall e distinguish between two targets which are very close together either in range or bearing For example a vessel towing another will probably appear as one ves sel as both will be covered by the beam at the same time The nautical chart and radar picture shown in Figure 3 8 are from the Kada Inland Sea in southwestern Japan Black areas are strong reflection
42. NR amp Radar Mode Selects pulselength for 1 5 and 3 mile ranges Select item and option by keys Selects radar interference rejector level 3 1 Pulselength SHORT LONG provides highest degree of rejection 2 Int Reject OFF 12 3 Turns noise rejector on off Noise Reject OFF ON Turns echo stretch on off 4 Echo Stretch OFF ON Select mode for CU or WPT UP 5 Radar mode CU WPT UP Press HM OFF to temporarily hide menu Selects navigator among GPS Loran and SEM DATA MENS all navigators available In the All setting Select item and option the radar selects a navigator in order of ay ile navigator accuracy GPS Loran and other d BAT Disp DES p LC Turns navigation data display on off 3 Disp Mode L L TD Selects position display format latitude and 4 Depth Unit M FA FT longitude or Loran TDs 5 Temp Unit F Selects unit of measurement for depth 6 STBY Display meters feet or fathoms Selects unit of measurement for water temperature or F Selects what to display during stand by men S navigation data requires navigation input or STBY Press HM OFF to temporarily hide menu Selects window display format zoom or wide Select item and option Selects watchman interval among 5 min 10 ATIR min or 20 min 1 Window Display ZOOM WIDE a Waichman OFF 510 20 Selects alarm mode alarm to targe
43. ans 15 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 1 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 vent tube faces the stern direction This alignment must be as accurate as possible 33 5 Make sure the vent tube 15 the correct position and then fasten the radome base to the mounting platform with four each of M10 x 20 hex bolts flat washers and spring washers supplied Do not over tighten the bolts the tightening torque should be between 200 and 250 kg cm Radome base assy A N DOM We ii Flat washer Platform Spring washer M10 x 25 hex bolt Figure 5 9 How to fasten the radome base to the mounting platform d Shield Pd 802 Wiring and final preparation inside the antenna unit for MODEL 841 1 Drill a hole of at least 620mm through the deck or bulkhead to run the signal cable between the antenna unit and the display unit 2 Pass the signal cable through the hole Then seal the hole with sealing com pound for waterproofing 3 Unfasten the cable c
44. be echoes Every time the scanner rotates some radia tion escapes on each side of the beam called side lobes If a target exists where it can be detected by the side lobes as well as the main lobe the side lobe echoes may be represented on both sides of the true echo at the same range as shown in Figure 3 5 Side lobes show usually only at short ranges and from strong targets They can be reduced through careful reduction of the sensitivity or proper adjustment of the STC Main lobe Side lobe Spurious target Scanner Figure 3 5 Side lobe echoes Indirect echoes Indirect echoes may be returned from either a passing ship or returned from a reflecting surface on your own ship for example a stack In both cases the echo will return from a legitimate contact to the antenna by the same indirect path The echo will appear on the same bearing of the reflected surface but at the same range as the direct echo Fig ure 3 6 illustrates the effect of an indirect echo Indirect echoes may be recognized as follows they usually occur in a shadow sector they appear on the bearing of the obstruc tion but at the range of the legitimate con tact when plotted their movements are usu ally abnormal and their shapes may indicate they are not di rect echoes Heading mark Target Direct path Indirect path Obstruction Scanner mast funnel etc True
45. compass safe dis tances to prevent deviation of a magnetic This chapter covers installation Installation compass mainly consists of the following T ble 5 1 Compass safe distances siting and mounting the display unit and the antenna unit compass compass connection of the signal cable and the E establishing the ground connecting optional equipment and adjustments Typical mounting location for a sailboat and power boat are shown in Figure 5 1 The installation of this equipment requires certain electrical and mechanical skills If the owner of the equipment has doubts about his or her technical abilities we recommend that the equipment be installed by a qualified technician 5 1 Antenna Unit Installation Mounting considerations Figure 5 1 Typical antenna unit mounting location for sailboat and power boat When selecting a mounting location for the antenna unit keep in mind the following points nstall the unit on top of the wheelhouse or on the radar mast on an appropriate platform It should be placed where there is a good all round view with as far as possible no part of the ship s superstruc ture or rigging intercepting the scanning beam Any obstruction will cause shadow and blind sectors Locate the unit at least two meters away from a direction finder antenna to prevent interference to the direction finder norder
46. ctivated the receiver is less sensitive Therefore turn off the circuit when its function is not required 2 9 Tuning the Receiver The receiver can be tuned automatically or manually For automatic tuning the receiver is tuned each time you switch from stand by to transmit For manual tuning the re ceiver is properly tuned when the longest tuning indicator appears However the length of the indicator changes with the num ber of radar echoes range and other factors Tuning indicator AUTO 1 5 0 5 Y o m HS dag 1 ev 7 M Digs Fu 77 Figure 2 7 Tuning indicator Manual tuning The default tuning method is automatic To switch to manual tuning 1 Press the MENU key to open the menu 2 Press the cursor pad to select Tuning 3 Press the cursor pad to select MANUAL 4 Press the ENT key followed by the MENU key How to tune manually While pressing and holding down the HM OFF key press the 9 o clock or 3o clock position on the cursor pad to tune Tune to show the longest tuning indicator 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 By range rings Press the RINGS key to display the range rings Count the number of rings between the center of the display and the target Check the range ring interval at the top left corner and judge the distance
47. decrease the ranges at which targets may be detected Radar horizon Radar is essentially a line of sight phe 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 horizon is 6 greater than the optical hori zon Therefore if the target does not rise above the horizon the radar beam cannot be reflected from the target The distance to the horizon from the scan ner under normal conditions 1s calculated by the following formula Rmax 2 2 X 4h h Where Rmax Radar horizon mile h1 An tenna height meters h2 Target height meters Horizon 2 Wave Figure 3 1 Radar horizon 3 2 Target Properties and Radar Wave Reflection Generally larger targets can be seen on the radar display at greater ranges provided line of sight exists between the scanner and target However a large target with poor reflecting properties may not be detected as easily as a smaller target with better ing properties For example you might ex pect a lighthouse to be a good radar target because of its size In actuality the return echo is weak since the conical shape diffuses most of the radiated energy A ship whose hull is made of conducting materials such as steel will return a rela tively strong echo 21 On other hand hulls made from wood or fiberglass return much
48. e The LCD will in time accumulate a coating of dust which tends to dim the picture Wipe LCD lightly with a soft cloth 6 months Display unit Check for tight connection and If corroded contact your dealer to 1 year connectors corrosion for replacement Do not use chemical cleaners to clean any part of the display unit they can remove paint and markings 26 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 Table 4 2 Troubleshooting table you pressed the the control panel does try adjusting the control panel back POWER key to turn not light lighting on the Brilliance Backlighting on the radar menu battery may have discharged check fuse in power cable nothing appears on try adjusting the tone the display or display Extreme ambient temperature may contrast is poor affect display tone characters are request service distorted the radar has the antenna does the problem may be in antenna unit warmed up and you rotate Hequest service pressed the ST BYTX key to characters and have a qualified technician check the transmit indications are set abnormal you have adjusted neither noise nor check signal cable for dama
49. ead to run the signal cable between the antenna unit and the display unit 2 Pass the cable through the hole Then seal the hole with sealing compound for waterproofing 3 Unfasten the cable gland and pass the signal cable through the hole at the rear of the radome base The cable has three plugs which you connect to the antenna unit 4 Secure the cable with the cable clamp ing plate and gaskets Fasten the shield to one of the fixing screws for the cable clamping plate to ground the shield 31 5 Connect three plugs to the antenna unit P801 9 way P813 2 way and P810 10 way Figure 5 5 Antenna unit MODEL 821 inside view 6 Put the radome on the radome base 7 Tighten the fixing bolts for the radome sembly The arrow should face toward ine Bav 8 The cable run must be properly sup ported and must not be used to provide impromptu foot holds or hand holds Clips or hangers should be employed 20 Ship s bow E 2 Figure 5 6 How to position the radome cover MODEL 21 32 Mounting procedure for MODEL 841 Removing packing materials 1 Open the radome cover carefully Re move mounting hardware at the bottom of the radome base assembly f
50. et cursor on top bottom left edge of the guard zone Press the GUARD key G IN or G with asterisk blinking appears at the top right hand corner on the display The asterisk indicates the guard zone is partially set See Figure 2 14 2 3 Operate the cursor pad to set cursor on bottom top right edge of the guard zone and press the GUARD key The aster isk disappears See Figure 2 14 3 4 Guard zone appears on the display See Figure 2 14 4 Silencing the audible alarm Any ships landmasses etc coming into or going out of the guard zone will trigger the audible alarm and display the guard zone in 13 reverse video You can silence the alarm by pressing the GUARD key When this 1s done G ACKN replaces G IN or G OUT Press the GUARD key again to reactivate the alarm G IN or G OUT replaces G ACKN Canceling the guard zone Press and hold down the GUARD key until the guard zone disappears Notes on the guard alarm When the radar range is less than one half of the guard zone range the guard zone disappears from the display and UP RANGE appears If this happens raise the range to redisplay the guard zone A target echo does not always mean landmass reef ships or surface objects but can imply returns from sea surface or Asterisk blinking EN Guard zone to set Drag cursor here 1 Mentally create the guard zone to set 2 Drag cursor
51. ge the gain with FTC targets appear and STC off indications and markers do neither indications nor check signal cable for damage markers appear noise and targets do the sweep radial line the problem may be in the antenna sweeping around the unit Request service display is not synchronized with antenna rotation there is no change request service sensitivity a key is pressed nothing happens key be faulty Request service 27 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 Cor responding key on the screen turns black Prog NO 03590951 ROM OK RAM OK On Hours 000019 5H Tx Hours 000019 5 lt gt lt MENU Figure 4 1 Self test screen 3 To check the keyboard press a key Its corresponding location on the display lights in black if the key 15 operating prop erly 4 To escape the test press the MENU key The ROM and RAM are automatically checked If NG No Good appears to the right of ROM or RAM indication contact your dealer for advice 28 5 INSTALL ATION A magnetic compass will be affected 1f placed too close to the antenna unit Ob serve the minimum
52. he display when the display is off cen tered Note The off centered display is automatically canceled when the DISP MODE key is pressed Cursor Cursor 1 Place cursor where desired key cursor location becomes screen center Figure 2 16 Off centering the display 15 2 Press OFF CENTER 2 21 Echo Trails You can show the trails of targets after glow This function is useful for alerting you to possible collision situations Starting echo trail Press the TRAIL key to start the echo trail function Afterglow starts extending from targets and TRAIL and the echo trail time appear at the top right hand corner of the display Press the key again within 3 sec onds to select a different trail time among 15 sec 30 sec 1 min 3min 6 min 30 min and continuous In continuous plotting the time elapsed appears at the top right corner on the display Note If the range is changed trails are painted anew with the newly selected range Relative trails requires gyro True trails Figure 2 17 Appearance of echo trails Fixed time trails When the elapsed time clock counts up to the trail time selected the elapsed time dis play freezes The oldest portions of trails are erased so only the latest trail equal in length to the trail time selected 1s shown Then trails start extending again For example the one minute trail time 1 selected When the elapsed time display freezes at 6
53. igh both sea clutter and targets will disappear from the display In most cases adjust so clutter has disap peared to leeward but a little 1s still visible windward If there 1 no clutter visible on the display turn off the circuit Sea clutter at display center STC adjusted sea clutter suppressed Figure 2 5 Effect of STC How to adjust and suppressing rain clutter The vertical beamwidth of the scanner is de signed to see surface targets even when the ship 1s rolling However by this design the unit will also detect rain clutter rain snow hail etc in the same manner as normal tar gets Figure 2 6 shows the appearance of rain clutter on the display Adjusting A C RAIN When rain clutter masks echoes over a wide range raise the A C RAIN slightly to dis tinguish targets from the clutter A C RAIN adjusted rain clutter suppressed Appearance of rain clutter Figure 2 6 Effect of A C RAIN Adjusting FTC To suppress rain clutter from heavy storms or scattered rain clutter adjust the FTC The FTC circuit splits up these unwanted ech oes into a speckled pattern making recog nition of solid targets easier FTC and selected level appear at the top right hand corner of the display when the circuit 15 turned on Note In addition to reducing clutter the FTC can be used in fine weather to clarify the pic ture when navigating in confined waters How ever with the circuit a
54. ion Heading signal can be connected to the connector 10 m cable assembly 15 optionally available Type Code no Remarks MJ A6SPF0007 100 000 125 237 C 2000 MJ A6SPFO0009 100 000 125 236 100 The OPTION connector To connect external equipment to the OP TION connector 1 Remove the plastic cover on the connec tor 2 Connect equipment to J61 on the SPU Board as shown in Figure 5 15 Cable supplied with radar connector assy 03 1796 5 VIDEO SOUNDER Cable supplied with video sounder DISPLAY UNIT SPU 9180 Solder and tape 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 Distribution NAV data to the other equipment This radar can output NAV data received from a navaid to an echosounder or video plotter by making the modifications as shown below SPU9180 Video plotter MODEL 821 841 FMD 811 The position data from navaid can be used for the echosounder if a video plotter is not connected Procedure 1 Unfasten the nuts fixing the waterproof connector to remove the covers of the power and display unit 2 Remove all connectors from SPU Board SPU 9180 3 Unfasten three screws to remove the board 4 Remove R91 and R92 on the parts side of SPU Board 39 2 SPU 9180 Parts side Remove JP3 OQ
55. ivity on the highest range the back ground noise is clearer on that range The proper setting is such that the background noise is just visible on the screen If you set up for too little gain weak echoes may be missed On the contrary excessive gain yields too much background noise strong targets may be missed because of the poor contrast between desired echoes and the background noise on the display 6 How to adjust STC suppressing sea clutter Echoes from waves can be troublesome covering the central part of the display with random signals known as sea clutter The higher the waves and the higher the scan ner above the water the further the clutter will extend Sea clutter appears on the dis play as many small echoes which might af fect radar performance See the left hand figure in Figure 2 5 The STC reduces the amplification of ech oes at short ranges where clutter 15 the great est and progressively increases amplification as the range increases so am plification will be normal at those ranges where there is no sea clutter The control is effective up to about 4 miles STC can be adjusted automatically or manu ally For manual adjustment first adjust the eain and then transmit on short range Ad just the STC level such that the clutter 15 broken up into small dots and small targets become distinguishable If the setting 1s set too low targets will be hidden in the clutter while if it is set too h
56. lamping plate by loosening four M4 screws and removing two gaskets at the radome base 4 Pass the cable through the hole at the bottom of the radome base Three plugs are attached at one end of the signal cable 5 Secure the cable with the cable clamp ing plate and gaskets removed in step 3 6 Connect the ground wire between one of the fixing screws for cable clamping plate and the IF amplifier chassis 7 Referring to Figure 5 10 mate the 9 way and 2 way plugs to the MD Board Re move the lid of the IF Board and mate the 14 way plug there Reattach the lid Figure 5 10 Antenna unit MODEL 841 inside view shield cover removed 34 Put the on the radome base 5 sembly The arrow should face toward the bow SHIP S BOW ZA NARROW Figure 5 11 How to position the radome cover MODEL 841 A Assembling the mounting bracket M8 x 20 B Fastening radome to mounting bracket Radome shown is for MODEL 821 mounting pro cedure is same for MODEL 841 9 Tighten the fixing bolts for the radome 10 The cable run must be properly sup ported and must not be used to provide impromptu foot holds or hand holds Clips or hangers should be employed every 20 cm Type OP03 92 for M 841 Code no 008 445 070 93 for 821 Code no 008 445 080 Figure 5 12 Optional mounting bracket installation for sailboat 35 5 2 Display Unit Installation Moun
57. lay when the interference rejection circuit 1 turned on 2 18 Suppressing 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 amp Int Noise Rej amp ES and press the ENT key 3 Select Noise Reject to ON 4 Press the ENT key followed by the MENU key 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 amp Int Noise amp ES and press the ENT key 3 Select Pulselength to SHORT or LONG 6 Press ENT and 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 t
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59. mple and description for each presentation mode like in 1500 2 or 8000 series Also add section on how display is reset in true motion and change Table of Contents if necessary 2 16 Guard Alarm The guard alarm allows the operator to set the desired range and bearing for a guard zone When ships islands landmasses etc enter or exit depending on type of guard zone in use the guard zone an audible alarm sounds to call the operator s attention The alarm is very effective as an anticollision aid when using an autopilot or navigating in narrow channels N CAUTION The guard alarm is a useful anti collision aid but does not relieve the operator of the responsibility to also keep a visual lookout for possible collision situations The alarm should never be used as the sole means for detecting possible collision situations Selecting guard zone type The guard alarm can be set to sound on tar gets entering guard in or exiting guard out the guard zone Select type of guard zone as follows 1 Press the MENU key to display the menu 2 Select Mode amp Function and press the ENT key 3 Select Alarm Mode to IN or OUT 4 Press the ENT key followed by the MENU key Dashed line no alarm IN ALARM OUT ALARM Figure 2 13 In and out alarms Setting the guard zone 1 Mentally create the guard zone you want to display See Figure 2 14 1 2 Operate the cursor pad to s
60. nit and to allow you to get your hands in on both sides to loosen or tighten the mounting knobs Make sure you leave at least a foot or so of service loop of cables behind the unit so it can be pulled forward for servicing or easy removal of the connectors A magnetic compass will be affected if placed too close to the display unit Ob serve the minimum compass safe dis tances to prevent deviation of a magnetic compass standard compass 0 7 meters and steering compass 0 5 meters Mounting procedure The display unit is designed to be mounted on a tabletop 1 2 3 4 5 Using the hanger as template mark screw locations in the mounting location Fix the hanger to the mounting location with four M6 tapping screws supplied Fit the knob bolts to the display unit Install the display unit the hanger Tighten the knob bolts securely 10 222 8 7 7 236 9 3 2 Cutting size for flushmount 2 0707007770 l 4 06 m FIXING HOLES Figure 5 13 How to mount the display unit 37 Connections Connect the signal and power cables the eround wire and optional equipment as shown in Figure 5 14
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62. o returned from the bow direction will be shown on the zero de 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 15 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 15 kept free of foreign ma terials and 1s 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 Findthe 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 5 Make sure the vent tube 15 the correct position and then fasten the radome base to the mounting platform with four each of M10 x 20 hex bolts flat washers and spring washers supplied Do not over tighten the bolts the tightening torque should be between 200 and 250 kg cm Radome base assy SS 15 0 A WALZ 2 washer NA Platform Spring washer M10 x 25 hex bolt Figure 5 4 How to fasten the radome base to the mounting platform Wiring and final preparation inside the antenna unit for MODEL 821 1 Drill a hole of at least 627mm through the deck or bulkh
63. o true north true bearing as follows True bearing re quires heading sensor input 1 Press the MENU key 2 Select Mode amp Function and press the ENT key 18 3 Select EBL Ref 4 Select Rel ative or True 5 Press the ENT key followed by the MENU key 2 26 Watchman How watchman works The watchman function periodically trans mits the radar for about one minute to check for targets in a guard zone it finds change in the zone from the previous transmission it sounds the aural alarm cancels the watch man function and transmits the radar con tinuously This feature is useful when you do not need the radar s function continu ously but want to be alerted to radar targets in a specific area Tx St by Tx St by m imn 5 100 1min 5 100r 20 min 20 min Watchman starts Figure 2 21 How watchman works Turning on watchman 1 Create a guard zone usually 360 degrees with the guard alarm function 2 Press the MENU key 3 Select Mode amp Function and press the ENT key 4 Select Watchman 5 Select watchman rest interval amount of time until next rotation of antenna 5 minutes 10 minutes or 20 minutes 6 Press the ENT key followed by the MENU key Then WATCHMAN pears and the radar transmits for one minute and then goes into stand by Canceling watchman Press any key while the radar is transmit ting Pressing a key during stand by causes the radar to go to
64. of the echo from the inner edge of the nearest ring By cursor Operate the cursor pad to place the cursor intersection on the inside edge of the target echo The range to the target as well as the bearing appears at the bottom of the dis play By VRM 1 Press key to display VRM 2 Press the cursor pad to place the VRM on the inside edge of the target The cur sor appears and 1s linked with the VRM allowing you to measure both range and bearing to the target 3 Check the at the bottom left hand corner of the display to find the range to the target Note The VRM is automatically anchored when no cursor pad key is operated within about 10 seconds To erase the VRM press and hold down the VRM key for about three seconds 1 5 npa 1 5 js SENSN Fu Gp Target E z E 2 EX P V E E 5 gt 22 N lt ou 24 E mu S M Cbd ix ae VBM VRM CURSOR 0 675 0 675nm 308 7 Figure 2 8 Measuring range by VRM 2 11 Measuring the Bearing There are two ways to measure the bearing to a target by the cursor and by the EBL Electronic Bearing Line By cursor Operate the cursor pad to bisect the target with the cursor intersection The bearing to the target appears at the bottom right hand corner of the display By
65. or use at anytime but no radar waves are being transmitted Press the ST B Y TX key to transmit When transmitting any echoes from targets appear on the display This radar displays echoes in four tones of gray according to echo strength When you won t be using the radar for an extended period but want to keep it in a state of readiness press the ST BY TX key to set the radar in stand by 2 5 Selecting the Range The range selected automatically determines the range ring interval the number of range rings pulselength and pulse repetition rate for optimal detection capability in short to long ranges Procedure Press the RANGE key The range and range ring interval appear at the top left cor ner on the display Tips for selecting the range e When navigating in or around crowded harbors select a short range to watch for possible collision situations e If you select a lower range while on open water increase the range occasionally to watch for vessels that may be heading your way 2 6 Adjusting LCD Backlighting and Display Tone The BRILL key adjusts the LCD back lighting in eight levels including off The TONE key adjusts the tone contrast of the display in 32 levels including off Procedure 1 Press the BRILL key or TONE key The display shown in Figure 2 3 appears UP Item selected for adjustment BRILL DOWN u Tone LCD brilliance setting MENU TO EXIT setting
66. our each of MIO 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 washer hex head bolt Figure 5 7 Antenna unit MODEL 941 showing location of mounting hardware 2 Unfasten the four fixing bolts securing the radome cover to the radome base Lift radome carefully to remove the antenna radiator packing materials Packing material N Fixing bolt Figure 5 6 Antenna unit MODEL 941 showing location of fixing bolts Mounting platform 3 Prepare and fasten a platform of 5 to 10mm in thickness to the mounting lo cation For sailboats an optional mount ing bracket which can be fixed to a mast is available See page 35 for details The mounting surface must be parallel with the waterline and provided with six holes whose dimensions are shown in the outline drawing at the back of the manual four 12mm holes for fixing and one 27 mm hole for cable entry 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 me
67. rm N CAUTION The barometer and depth displays are intended as reference Any data displayed by them should be used with extreme caution Procedure 1 Press the MENU key 2 Select the Nav Data menu and press the ENT key 3 Select STBY Display to NAV and press the ENT key 4 Press the MENU key Note 1 The depth display scale changes au tomatically with depth and the maximum depth is 1 000 meters Note 2 The barometer display is updated hourly thus the data shown may not be the latest ST BY Mbar hPa 1020 1010 m m i006 900 AD 9 6 48 HOUR BAROMETER DEPTH DATE TIME TEMP CHS 08 22 15 19 30 0 c 0 0 M DEPTH XTE SPD 827 m 0 6NM R 30 0KT WAYPOINT i SN 12 0NM 114 8 R 165 43 96 L 0 5 O NM 0 5 1 Figure 2 22 Navigation data display during stand by 19 2 30 Cursor Position to Navigator Cursor position NMEAO183 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 tude and longitude or the range and bearing from own ship to the cursor You can select the indication desired by pressing the HM OFF key 2 32 Visual Alarm Indications This radar display various visual alarms to alert yo
68. tation modes head up course up course up or waypoint up selectable on menu north up and true motion Press the DISP MODE and HM OFF keys together to select a presentation mode Each time the keys are pressed if heading signal is input to the radar the pre sentation mode and mode indication change in the sequence of HU CU or WU NU TM If there 1s no heading signal input to the radar the presentation mode 1 always HU NU TM north up true motion CU couse up HU WU head up hw Selecting course up mode for CU or WPT UP In course up you may select CU or WPT UP on the menu CU course up An azimuth stabilized display in which the line connecting the center with the top of the display indicates own ship s intended course WPT UP waypoint up An azimuth stabilized display in which the line connecting the center with the top of the 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 a waypoint the ra dar displays the bearing to the next waypoint Procedure 1 Press the MENU key to open the menu 2 Press the cursor pad to select 2 P L IR NR amp Radar Mode 3 Press the cursor pad to select Radar mode 4 Select option for CU or WPT UP 5 Press the ENT key followed by the MENU key NOTE Insert display exa
69. ting considerations When selecting a mounting location for the display unit keep in mind the following points The display unit 1s designed and con structed to be splashproof thus it can be installed outdoors You can even hose it down after a day s outing If it 1s to be installed outdoors we recommend install ing it an enclosed cabinet for maximum protection against the marine environ ment The temperature and humidity of the mounting location should be stable and moderate No LCD can provide adequate contrast if the ambient temperature is too extreme The display unit consumes only a mod erate amount of power so there is no need for forced air ventilation However you should provide adequate space behind and around the unit to permit circulation of air and to provide convenient access to the rear connectors Even though the picture is quite legible even in bright sunlight keep the display unit out of direct sunlight or at least shaded because of heat that can build up inside the cabinet Locate the display unit in a position where you can view and operate it conveniently but where there is no danger of salt or fresh water spray or immersion 36 The orientation of the display unit should be so the radar screen is viewed while the operator is facing the direction of the bow This makes determination of your position much easier Make sure you allow enough clearance both to get to the connectors behind the u
70. to minimize the chance of pick ing up electrical interference avoid where possible routing the signal cable near other onboard electrical equipment Also avoid running the cable in parallel with power cables 29 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 MIO 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 Burm 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 gt bolt washer Figure 5 3 Antenna unit MODEL 621 showing location of fixing bolts 30 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 1s 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 1s a cable entry cable gland out side the antenna unit which should face the stern direction The unit 1s adjusted so a target ech
71. tracks along the EBL as it approaches the screen center it may be on a collision course with your vessel 2 12 Menu Operation 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 MENU key You can select items on the menu with the cursor pad Basic menu operation 1 Press the MENU key to open the menu main menu appears MAIN MENU Select item by keys and press ENT key 1 Backlight Brilliance 2 P L IR amp Radar Mode Nav Data Mode amp Function MANUAL Tuning Self Check Installation Setup 1 Press HM OFF to temporarily hide menu Press MENU key to escape Figure 2 10 Main menu 2 Press the cursor pad to select menu and press the ENT key 3 Press the cursor pad to select menu item 4 Press the cursor pad to select option 5 Press the ENT key to register selection 6 Press the MENU key to close the menu Menu description see the table on the next page Table 1 1 Menu description 1 BACKLIGHT BRILLIANCE MENU 1 Selects control panel backlighting four is maximum backlighting Select item and option by keys 2 Selects brilliance for echo trails and 1 Panel 1 3 4 markers four is maximum brilliance 2 Echo Trails 2 2 Press HM OFF to temporarily hide menu Press MENU for main menu 2 P L IR
72. tretch OFF Echo stretch ON Figure 2 20 Echo stretch Turning echo stretch on or off 1 Press the MENU key 2 Select P L amp Int Noise Rej amp ES and press the ENT key 3 Select Echo Stretch 4 ON or OFF 17 5 Press the ENT key followed by the MENU key ES appears at the top right side on the display when the echo stretch feature 15 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 and radar interference are properly adjusted before activating the echo stretch Note 2 Echo stretch is inoperative on ranges from 0 25 to 0 75 nautical miles ES appears in reverse video when you try to turn on the echo stretch in those ranges Note 3 When the echo stretch function is se lected Interference Rejection level 3 along with the Noise Rejection circuits are automati cally enabled These can be turned off via menu selection if desired 2 24 Selecting Unit of Measurement for Range The unit of measurement for the VRM and cursor can be nautical miles kilometers or statute miles You may select unit desired as follows 1 Press the MENU key 2 Select Mode amp Function and press the ENT key 3 Select VRM Unit to nm km or sm 4 Press ENT followed by MENU key 2 25 Selecting Bearing Reference Bearing can be displayed relative to north relative bearing or relative t
73. ts 3 Alarm Mode IN OUT entering the guard zone or OUT alarm to 4 VRM Unit pud targets exiting the guard zone 5 EBL Ref Selects VRM unit nm km or sm 6 Range 1 8 1 4 1 2 3 4 1 1 5 Selects EBL reference relative or true 2348 12 16 24 36 Selects ranges to use Select range to Press HM OFF to temporarily enable disable and press ENT key 4 MODE amp FUNCTION MENU Press MENU for main menu Selects AUTOMATIC or MANUAL tuning oelf Check Checks the radar system for proper operation Default settings shown in boldface 2 13 Selecting the Display Mode 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 and Normal Window Nav Data Window Display Nav Display ON CURSOR wee WIDE Each time the key is pressed the display mode changes in one of the sequences shown below depending on equipment connected and menu settings Note In the window display mode the DISP MODE key reselects zoom area To select the display mode while in the window display mode press the key twice ZOOM OFF Window Display WIDE ZOOM Nav Display OFF Figure 2 11 Display modes 11 2 14 Window Display 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
74. u Press MENU for main menu Figure 5 20 Installation setup 2 menu 3 Select Align Heading and press the ENT key 4 Press the cursor pad to bisect the target selected at step 2 with the EBL 5 Press the ENT key 6 Asa final test move the boat towards small buoy and confirm that the buoy shows up dead ahead on the radar when it 1 visually dead ahead 5 8 Sweep Timing This adjustment ensures proper radar per formance especially on short ranges The radar measures the time required for a trans mitted echo to travel to the target and return to the source The received echo appears on the display based on this time Thus at the instant the transmitter 1s fired the sweep should start from the center of the display sometimes called sweep origin A trigger pulse generated in the display unit goes to the antenna unit through the signal cable to trigger the transmitter magnetron The time taken by the signal to travel up to the antenna unit varies depending largely on the length of signal cable During this period the display unit should wait before starting the sweep When the display unit 18 not adjusted correctly the echoes from a straight local object for example a harbor wall or straight pier will not appear with straight edges namely they will be seen as pushed out or pulled near the pic ture center The range of objects will also be incorrectly shown 1 Correct inward
75. u to error Table 2 1 Visual alarm indications No heading pulse HD SIG MISSING No bearing pulse BP SIG MISSING Heading signal appears turned off as heading The heading signal visual alarm may be cleared by pressing the DISP MODE key 20 3 INTERPRETING THE DISPLAY As an aid to navigation radar can be a very valuable tool No other electronic naviga tion aid can give you the ability to spot ves sels coming at you in the fog or tell you the location of the inlet to the harbor in the pitch black of night To help you understand what your radar can and cannot do for you this chapter covers the characteristics of the radar wave target properties and radar wave on range and bearing resolution and false echoes 3 1 The Radar Wave and Radar Horizon How the radar wave travels The radar wave tends to travel in straight lines at the speed of light However it 1s subject to bending or refraction in the atmo sphere the amount depending on region and density Super refraction Super refraction 1 a condition in which there 1s an upper layer of warm dry air over a surface layer of cold moist air Radar waves bend downward and thus increase the ranges at which targets may be detected Sub refraction Sub refraction 15 the reverse condition of super refraction a layer of cold air 1s above a layer of warm air Radar waves bend up ward and thus
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Furuno 1834C-BB Radar Detector User Manual

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