Furuno 841 MARK-2 Operator's Manual
  1. Manuals
  2. Brands
  3. Furuno Manuals
  4. Marine Radar
  5. 841 MARK-2
  6. Operator's manual
Furuno 841 MARK-2 Operator's Manual

Furuno 841 MARK-2 Operator's Manual

Furuno marine radar user manual
Hide thumbs
Table of Contents

Advertisement

Quick Links

MARINE RADAR
MODEL 841 MARK-2
MODEL

Advertisement

Table of Contents
loading

Related Manuals for Furuno 841 MARK-2

Summary of Contents for Furuno 841 MARK-2

  • Page 1 MARINE RADAR MODEL 841 MARK-2 MODEL...
  • Page 2 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 T e l e p h o n e : 0 7 9 8 - 6 5 - 2 1 1 1 T e l e f a x : 0 7 9 8 - 6 5 - 4 2 0 0...
  • Page 3 If you have any questions regarding these safety instructions, please contact a FURUNO agent or dealer. The level of risk appearing in the notices is defined as follows:...
  • Page 4 Safety Instructions for the Operator WARNING Do not open the equipment. Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment. Only qualified personnel should work inside the equipment. Wear a safety belt and hard hat when working on the antenna unit.
  • Page 5 Safety Instructions for the Installer WARNING Do not work inside the equipment unless totally familiar with electrical circuits. Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment. Wear a safety belt and hard hat when working on the antenna unit.

  • Page 6: Table Of Contents

    TABLE OF CONTENTS FOREWORD ... v SPECIFICATIONS ... vii EQUIPMENT LIST ... ix CONFIGRATION ... xi 1. PRINCIPLE OF OPERATION... 1 1.1 What is Radar? ... 1 1.2 How Ships Determined Position Before Radar ... 1 1.3 How Radar Determines Range ... 1 1.4 How Radar Determines Bearing ...

  • Page 7: Foreword

    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.

  • Page 8: Specifications

    SPECIFICATIONS Antenna Unit 1. Radiator Printed array 2. Radiator length 54 cm 3. Horizontal beamwidth 4. Vertical beamwidth 5. Sidelobe -20 dB within main lobe -23 dB outside main lobe 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)
  • Page 9 Stand-by (ST-BY), Echo Trail Time (TRAIL), Variable Range Marker (VRM), Range, Range Ring Interval, Range and Bearing to Cursor (+), Off Center (OFF CENTER), Watchman (WATCHMAN) 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.

  • Page 10: Equipment List

    EQUIPMENT LIST Complete Set l l a Installation Materials (CP03-15xx) Spare Parts (SP03-9800) Accessories (FP03-05900) e i l...

  • Page 11: Optional Equipment

    Optional Equipment i f i t b l i...
  • Page 12 CONFIGURATION MODEL 841 MARK-2 (In/Out) IEC 1162* IEC 1162* Video Sounder Fluxgate Heading Sensor C-2000 Gyro Gyro Converter AD-100 *Equivalent to NMEA0183 Option (In) 10.2~31.2VDC Antenna Unit Remote Display FMD-811 External Alarm Buzzer OP03-136 Rectifier PR-62 115/230VAC...

  • Page 13: Principle Of Operation

    1. PRINCIPLE OF OPERATION 1.1 What is Radar? The term "RADAR" is an acronym mean- ing RAdio Detection And Ranging. Al- 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.
  • Page 14 Own ship (radar) (A) Bird's eye view of situation Targets Own ship in center (B) Radar picture of (A) Figure 1-1 How radar works Heading line Range and bearing of a target, relative to own ship, are readable on the PPI.

  • Page 15: Operation

    2. OPERATION 2.1 Control Description Registers selection on menus. Press to adjust gain, A/C RAIN, STC and FTC. Adjusts display tone. Turns the EBL on/off. Plots targets' trails. Sets guard zone area. Selects display mode; erases heading error indication. MENU ECHO RANGE TONE...

  • Page 16: Display Indications And Markers

    2.2 Display Indications and Markers Range Range ring interval Presentation mode Off center CENTER Pulsewidth Heading marker Guard zone area Cursor 0.675 2.3 Turning the Radar On and Off Turning the radar on Press the [POWER] key to turn the radar on or off.

  • Page 17: Transmitting

    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 the radar is now fully operational. In stand-by the radar is available for use at anytime— but no radar waves are being transmitted.

  • Page 18: Adjusting Gain, Stc, A/Crain And Ftc

    2.8 Adjusting GAIN, STC, A/C RAIN and FTC General procedure The [ECHO] key enables adjustment of the gain, STC, A/C RAIN and FTC. 1) Press the [ECHO] key. The following dis- play appears. AUTO GAIN AUTO RAIN ECHO KEY TO EXIT Figure 2-4 Display for adjustment of GAIN, STC, A/C RAIN and FTC 2) Press the cursor pad to select item to ad-...

  • Page 19: Tuning The Receiver

    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 the ship is rolling. However, by this design the unit will also detect rain clutter (rain, snow, hail, etc.) in the same manner as normal tar- gets.

  • Page 20: Measuring The Range

    2.10 Measuring the Range You can measure the range to a target three ways: by the range rings, by the cursor, and by the VRM (Variable Range Marker). 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.

  • Page 21: Menu Operation

    To erase the EBL, press and hold down the [EBL] key for about three seconds. Target 0.675 300.1° 0.675 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 is not as easily identified.
  • Page 22 Menu 1. BACKLIGHT/BRILLIANCE MENU Select item and option keys. 1. Panel 1 2 3 4 2. Echo Trails ........Press HM-OFF to temporarily hide menu.

  • Page 23: Selecting The Display Mode

    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 **.** NM ***.*°R...

  • Page 24: The Window Display

    2.14 The 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 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.

  • Page 25: Guard Alarm

    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 “TO”...

  • Page 26: Suppressing Radar Interference

    pressing the [GUARD] key. When this is 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.

  • Page 27: Suppressing Noise Interference

    corner on the display when the interference rejection circuit is 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.

  • Page 28: Echo Trails

    2.21 Echo Trails You can show the trails of targets in 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"...

  • Page 29: Echo Stretch

    HDG 326.8° DEPTH 350.0m 0.05NML 30.0KT WAYPOINT 66° 04. 00N 12.0 45.0° 166° 04. 00E 0.675 240.1° 0.646 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 keys.

  • Page 30: Selecting Unit Of Measurement For Range

    4) ON or OFF. 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 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 and radar interference are properly adjusted before activating the echo...

  • Page 31: Erasing The Heading Marker

    Canceling watchman Press any key while the radar is transmit- ting. (Pressing a key during stand-by causes the radar to go to warm-up condition.) 2.27 Erasing the Heading Marker The heading marker continuously appears on the display and shows your vessel’s head- ing.

  • Page 32: Outputting Cursor Position To Navigator

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

  • Page 33: Interpreting The Display

    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.

  • Page 34: Range Resolution

    On the other hand, hulls made from wood or fiberglass return much 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.
  • Page 35 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 Target...

  • Page 36: Nautical Chart And Radar Picture

    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.

  • Page 37: Maintenance & Troubleshooting

    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 safety information which follows. 4.1 Safety Information ELECTRICAL SHOCK HAZARD This equipment uses high voltage WARNING electricity which can shock, burn or...

  • Page 38: Preventative Maintenance

    4.2 Preventative Maintenance Regular maintenance is 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.

  • Page 39: Troubleshooting

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

  • Page 40: Self Test

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

  • Page 41: Installation

    5. INSTALLATION This chapter provides the procedures neces- sary for installation. Installation mainly con- sists of the following: ¡ siting and mounting the display unit and antenna unit ¡ connection of the signal cable and the power cable ¡ establishing the ground ¡...
  • Page 42 Mounting platform Holes for antenna unit: The mounting surface must be parallel with the waterline and provided with five holes whose dimensions are shown in the outline drawing attached at the end of this manual. The unit is adjusted so a target echo returned from the bow direction will be shown on the zero degree (heading line) position on the screen.

  • Page 43: Display Unit Installation

    7. Pass the cable through the hole at the bot- tom of the radome base. 8. Secure the cable with the cable clamping plate and gasket. Ground the shield and vi- nyl wire by one of the screws of the cable clamping plate.
  • Page 44 • Make sure you allow enough clearance both to get to the connectors behind the unit and to allow you to get your hands in on both sides to loosen or tighten the mount- ing knobs. Make sure you leave at least a foot or so of “service loop”...
  • Page 45 10.2-31.2VDC 3 GND DJ-1 TYPE SER.NO. DATE COMPASS SAFE DISTANCE EQUPMENT CLASS FURUNO ELECTRIC CO., LTD Ground terminal here and ship's ground. Figure 5-12 Display unit, rear view Grasp Boot-band Cable 3. Put the boot-band as shown below, and tighten it.
  • Page 46 Heading signal can be connected to the “HDG” connector. 10 m cable assembly is optionally available. Type Code no. MJ-A6SPF0007-100 000-125-237 MJ-A6SPF0009-100 000-125-236 MODEL 841 MARK-2 TX_H TX_C RD_H RD_C N.C. JP3(CUT) SHIELD The OPTION connector To connect external equipment to the OP- TION connector;...

  • Page 47: Installation Check List

    J55 (NMEA) SPU9180 TLL, RSD MODEL 841 M2 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 con- nector to remove the covers of the power and display unit.

  • Page 48: Initial Adjustment Of Picture

    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 mes- sage “ST-BY” appears on the screen. (About 1:30. 2) Press [TX ST-BY] key to transmit. The ra- dar will start transmitting, and you will prob- ably see some targets around you, even though the radar is not yet properly adjusted.

  • Page 49: Entering Initial Settings

    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.

  • Page 50: Closing The Installation Menus

    1) Transmit the radar on the shortest range and adjust the sensitivity and STC. 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 or 3 o’clock position to straighten the target.

Table of Contents