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MARINE RADAR
MODEL 821/841
MODEL
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C Your Local Agent/Dealer 9- 52, A s hi har a- c ho, Nishinomiya, Japan Telephone: 0798-65-2111 Telefax: 0798-65-4200 FIRST EDITION : AUG. 1995 All rights reserved. Printed in Japan G : JAN. 11, 2001 PUB. No. OME-34160 MODEL 821/841 (YOSH )
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SAFETY INFORMATION Safety Arrangements All known steps are taken in the design of this radar to ensure that electromagnetic radio frequency energy radiated by the equipment will not be a hazard to personnel. This is true if the following precautions are met. • 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. Electrical Shock Hazard WARNING This equipm
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2.26 Watchman ........................................ 18 TABLE OF CONTENTS 2.27 Erasing the Heading Marker ............ 19 2.28 Deselecting Ranges.......................... 19 2.29 Displaying Navigation Data During Stand-by ........................................... 19 FOREWORD .....................................ii 2.30 Outputting Cursor Position to SPECIFICATIONS ........................... iii Navigator ......................................... 20 EQUIPMENT LIST ...........
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Features FOREWORD Your radar has a large variety of functions, all contained in a remarkably small cabinet. Congratulations on your choice of the The main features of the MODEL 821/ FURUNO MODEL 821/MODEL 841 Ma- MODEL 841 are: rine Radar. We are confident you will see why the FURUNO name has become syn- • Traditional FURUNO reliability and onymous with quality and reliability. quality in a compact, lightweight and low-cost radar. For over 40 years FURUNO Electric Com- • Smartly styled, light-we
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10. Bandwidth SPECIFICATIONS– 7 MHz 11. Duplexer MODEL 821 Circulator with diode limiter Antenna Unit Display Unit 1. Radiator 1. Indication system Printed array PPI raster scan 2. Radiator length 2. Display 40 cm 8-inch diagonal LCD, STN semi- 3. Horizontal beamwidth transparent, yellow mode 5.7° 3. Range scales (nm) 4. Vertical beamwidth Range, Ring Interval: 0.125(0.0625), 30˚ 0.25(0.125), 0.5(0.125), 0.75(0.25), 5. Sidelobe 1(0.25), 1.5(0.5), 2(0.5), 3(1), 4(1), Less than -20dB 6(2), 8(2), 1
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With navigation input (option): Course SPECIFICATIONS– (CRS), Latitude and longitude, Speed (SPD), Range and bearing to waypoint MODEL 841 (WP), Cross Track Error (XTE), Date and time, Water depth, Water temperature. (This radar has Antenna Unit only two data input ports. To receive data from more than two equipment 1. Radiator install an mixing device.) Printed array 11. Vibration 2. Radiator length Vibration freq. Total amplitude 54 cm 5 to 12.5 Hz ±1.6 mm 3. Horizontal beamwidth 12 to 25 Hz
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9. Receiver front end With navigation input (option): Course MIC (Michoeave IC) (CRS), Latitude and longitude, Speed 10. Bandwidth (SPD), Range and bearing to waypoint 7 MHz (WP), Cross Track Error (XTE), Date 11. Duplexer and time, Water depth, Water Circulator with diode limiter temperature. (This radar has only two data input ports. To receive data from more than two equipment install an Display Unit mixing device.) 11. Vibration 1. Indication system Vibration freq. Total amplitude PPI raster
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17. Compass safe distance Interface NMEA (MODEL 821/841) Input Own ship’s position : RMA>RMC>GLL (GLL is available Ver.5 and after.) Speed : RMA>RMC>VTG>VHW Heading(True): HDT>VHW>HDG>VHW>HDM Heading (Magnetic): HDM>VHW>HDG>VHW>HDM Course (True): RMA>RMC>VTG Course (Magnetic) VTG>RMA>RMC Waypoint (L/L, Range, Bearing): RMB>BWC>BWR Loran time difference : RMA>GLC>GTD Water depth : DPT>DBK, DBS, DBT Water temperature : MDA>MTW Time : ZDA XTE : RMB>XTE>APB Output TLL : On using “HM OFF” key. RSD
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CONFIGURATION OF MODEL 821/841 Antenna Unit (MODEL 821) MODEL 821/841 (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 RP-62 115/230VAC 10.2~31.2VDC viii
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1.4 How Radar Determines 1. PRINCIPLE OF Bearing OPERATION The bearing to a target found by the radar is determined by the direction in which the radar scanner antenna is pointing when it 1.1 What is Radar? emits an electronic pulse and then receives a returning echo. Each time the scanner ro- The term "RADAR" is an acronym mean- tates pulses are transmitted in the full 360 ing RAdio Detection And Ranging. Al- degree circle, each pulse at a slightly differ- though the basic principles of radar w
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Heading marker Targets Range and bearing of a target, relative to own ship, are A D 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. TRAIL RINGS Plots targets' trails. 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 1.5NM Presentation mode CU FTC1 OFF Guard zone Off center ES CENTER IR Fast Time Constant Pulsewidth SP (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 +
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To erase the EBL, press and hold down the 2.12 Menu Operation [EBL] key for about three seconds. The menu, consisting of 6 sub menus, mostly 1.5NM contains less-often used functions which 0.5 once preset do not require regular adjust- ment. To open or close the menu, press the Target [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. EBL The main menu appears. l MAIN MENU l Select item by st keys and press ENT
