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MARINE RADAR
MODEL 841 MARK-2
MODEL
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C Your Loc al A gent/D ealer 9- 52, A s hi har a- c ho, N i s h i nom i y a, J apan Telephone: 0798-65-2111 Telefax: 0798-65-4200 FIRST EDITION : JAN. 1997 A ll r i g hts r e ser v ed. Printed in Japan G : JUL. 10, 2001 PUB. No. OME-34440 M O D E L841 M A R K - 2 (HIM A )
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SAFETY INSTRUCTIONS "WARNING" and "CAUTION" notices appear throughout this manual. It is the responsibil- ity of the operator and the installer of the equipment to read, understand and follow these notices. 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: This notice indicates a potentially hazardous situation which, if not avoided, could result in death or WARNING serious inj
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Safety Instructions for the Operator WARNING WARNING Do not operate the equipment with wet Do not open the equipment. hands. Hazardous voltage which can Electrical shock can result. cause electrical shock, burn or serious injury exists inside the Keep heater away from equipment. equipment. Only qualified personnel should work inside Heat can alter equipment shape and melt the equipment. the power cord, which can cause fire or electrical shock. Wear a safety belt and hard hat when working on
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Safety Instructions for the Installer WARNING CAUTION Do not work inside the Ground the equipment to equipment unless totally prevent electrical shock familiar with electrical and mutual interference. circuits. Confirm that the power supply voltage Hazardous voltage which can is compatible with the voltage rating cause electrical shock, burn or of the equipment. serious injury exists inside the equipment. Connection to the wrong power supply can cause fire or equipment damage. The Wear a saf
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TABLE OF CONTENTS 2.25 Selecting Bearing Reference .......... 18 FOREWORD ................................ v 2.26 Watchman ....................................... 18 SPECIFICATIONS ..................... vii 2.27 Erasing the Heading Marker ........... 19 2.28 Deselecting Ranges......................... 19 EQUIPMENT LIST ...................... ix 2.29 Displaying Navigation During CONFIGRATION ......................... xi Stand-by .......................................... 19 2.30 Outputting Cursor
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FOREWORD Congratulations on your choice of the Features FURUNO MODEL 841 MARK-2 Marine Radar. We are confident you will see why Your radar has a large variety of functions, the FURUNO name has become synony- all contained in a remarkably small cabinet. mous with quality and reliability. The main features of the MODEL 841 For over 40 years FURUNO Electric Com- MARK-2 are: pany has enjoyed an enviable reputation for • Traditional FURUNO reliability and innovative and dependable marine electron- qu
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SPECIFICATIONS 9. Receiver front end Antenna Unit MIC (Microwave IC) 10. Bandwidth 1. Radiator 7 MHz Printed array 11. Duplexer 2. Radiator length Circulator with diode limiter 54 cm 3. Horizontal beamwidth Display Unit 3.9° 4. Vertical beamwidth 20° 1. Indication system 5. Sidelobe PPI raster scan -20 dB within main lobe 2. Display -23 dB outside main lobe 8-inch diagonal LCD, STN semi- 6. Polarization transparent, yellow mode Horizontal 3. Range scales (nm) 7. Antenna rotation speed Range, Rin
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Stand-by (ST-BY), Echo Trail Time Interface NMEA (TRAIL), Variable Range Marker (VRM), Range, Range Ring Interval, Input Range and Bearing to Cursor (+), Off Center (OFF CENTER), Watchman Own ship’s position : RMA>RMC>GLL (WATCHMAN) (GLL is available Ver.5 and after.) With navigation input (option): Course Speed : RMA>RMC>VTG>VHW (CRS), Latitude and longitude, Speed (SPD), Range and bearing to waypoint Heading(True): (WP), Cross Track Error (XTE), Date HDT>VHW>HDG>VHW>HDM and time, Water depth
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EQUIPMENT LIST Complete Set Ne o.Ne amT. yp Cy ode No Qs t Remark 1tA8 ntenna uniR1 SB-0071-05 2tD2 isplay uniR1 DP-113-4 M 3sS0 pare partS1 P03-09800t 00-085-44 1 se 4sA0 ccessorieF0 P03-05900t 08-462-05 1 se C2 P03-18100 000-086-97 signal cable: 10 m C3 P03-181100m 00-086-97 signal cable: 15 Installation 5 materialsC4 P03-181200m 00-086-97 1 set signal cable: 20 (select one) C5 P03-181300m 00-086-97 signal cable: 30 C6 P03-181400e 00-086-54 w/o signal cabl Installation Materials (CP03-15xx) Ne
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Optional Equipment Ne o.Ne am T. ypCy ode NoQs t Remark 1rR2 ectifie P4 R-6 000-013-48 100 VAC 1 0C 00-013-485 110 VA 0C 00-013-486 220 VA 000-013-487 230 VAC 2rE6 xternal BuzzeO3 P03-1301 00-086-44 3)M2 ounting Bracket (1O0 P03-901 00-445-07 For sailboat x
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CONFIGURATION Antenna Unit MODEL 841 MARK-2 (In/Out) IEC 1162* Remote Display NAV FMD-811 IEC 1162* Video Sounder (In) Fluxgate Heading Sensor C-2000 External Alarm Gyro Gyro Converter Buzzer OP03-136 AD-100 *Equivalent to NMEA0183 5A Option Rectifier PR-62 115/230VAC 10.2~31.2VDC xi
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1. PRINCIPLE OF OPERATION 1.1 What is Radar? 1.4 How Radar Determines Bearing The term "RADAR" is an acronym mean- ing RAdio Detection And Ranging. Al- The bearing to a target found by the radar is though the basic principles of radar were determined by the direction in which the developed during World War II, primarily radar scanner antenna is pointing when it by scientists in Great Britain and the United emits an electronic pulse and then receives States, the use of echoes as an aid to navi- a
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Heading line Targets Range and bearing of a target, relative D to own ship, are A A D readable on the PPI. B B C C Own ship Own ship in center (radar) (A) Bird's eye view of situation (B) Radar picture of (A) Figure 1-1 How radar works 2
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2. OPERATION 2.1 Control Description Cursor pad Shift cursor, VRM and EBL; select items and options on menu. ENT MENU Registers selection Opens/closes menus. on menus. HM Press to adjust gain, ECHO Erases heading marker; OFF A/C RAIN, STC selects cursor data (Lat/Long, R/B); and FTC. outputs cursor position. Selects radar range. RANGE TONE BRILL Adjusts display Adjusts display brilliance. tone. EBL VRM Turns the EBL Turns the VRM on/off. on/off. Plots targets' trails. TRAIL RINGS Turns the rang
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2.2 Display Indications and Markers Heading (requires heading data) Range Echo trail, AUTO tuning TRAIL AUTO Echo trail elapsed time, Range ring interval 0:00 15S HDG 326.8° 0.5 G (IN) echo trail time, tuning indicator Presentation mode 1.5NM CU FTC1 OFF Guard zone Off center ES CENTER IR Fast Time Constant SP Pulsewidth (rain clutter suppressor) Echo stretch Heading marker Interference rejector Guard zone area Range ring Cursor EBL VRM Range and bearing to cursor
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2.4 Transmitting 2.6 Adjusting LCD Backlighting and Display Tone After the power is turned on and the mag- netron has warmed up, ST-BY (Stand-By) The [BRILL] key adjusts the LCD back- appears at the screen center. This means the lighting in eight levels, including off. The radar is now fully operational. In stand-by [TONE] key adjusts the tone (contrast) of the radar is available for use at anytime— the display in 32 levels, including off. but no radar waves are being transmitted. Press the [ST-
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How to adjust STC (suppressing sea 2.8 Adjusting GAIN, STC, A/C clutter) RAIN and FTC Echoes from waves can be troublesome, General procedure covering the central part of the display with random signals known as sea clutter. The The [ECHO] key enables adjustment of the higher the waves, and the higher the scan- gain, STC, A/C RAIN and FTC. ner above the water, the further the clutter 1) Press the [ECHO] key. The following dis- will extend. Sea clutter appears on the dis- play appears. play as ma
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How to adjust A/C RAIN and FTC 2.9 Tuning the Receiver (suppressing rain clutter) The receiver can be tuned automatically or The vertical beamwidth of the scanner is de- manually. For automatic tuning the receiver signed to see surface targets even when the is tuned each time you switch from stand- ship is rolling. However, by this design the by to transmit. For manual tuning, the re- unit will also detect rain clutter (rain, snow, ceiver is properly tuned when the longest hail, etc.) in the sam
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2.10 Measuring the Range 1.5NM 0.5 You can measure the range to a target three ways: by the range rings, by the cursor, and by the VRM (Variable Range Marker). Target By range rings Press the [RINGS] key to display the range rings. Count the number of rings between the center of the display and the target. VRM Check the range ring interval (at the top left corner) and judge the distance of the echo from the inner edge of the nearest ring. VRM EBL +
