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MARINE RADAR
MODEL 851 MARK-2
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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 : JUN. 2000 A ll r i g hts r e ser v ed. Printed in Japan D : JUL. 9, 2001 PUB. No. OME-34900 M O D E L 851 M A R K - 2 (YO S H )
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SAFETY INSTRUCTIONS WARNING WARNING Do not open the equipment. Do not disassemble or modify the equipment. Hazardous voltage which can cause electrical shock, burn or Fire, electrical shock or serious injury can serious injury exists inside the result. equipment. Only qualified ELECTRICAL personnel should work inside Turn off the power immediately if water SHOCK HAZARD the equipment. leaks into the equipment or the equipment is emitting smoke or fire. Wear a safety belt and hard hat when
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TABLE OF CONTENTS FOREWORD..........................................iv 2.18 Suppressing Noise Interference ............................. 2-15 SYSTEM CONFIGURATION ..................v 2.19 Selecting Pulselength............. 2-15 1. PRINCIPLE OF OPERATION 2.20 Off Centering the Display ....... 2-15 1.1 What is Radar?...........................1-1 2.21 Echo Trails ............................. 2-16 1.2 How Ships Determined Position 2.22 Navigation Data Display......... 2-17 Before Radar............
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MENU TREE ....................................... A-1 SPECIFICATIONS............................SP-1 INDEX.......................................... index-1 Declaration of Conformity iii
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FOREWORD Features Congratulations on your choice of the FURUNO Marine Radar MODEL 851 Your radar has a large variety of functions, all MARK-2. We are confident you will see why contained in a remarkably small cabinet. the FURUNO name has become synonymous The main features of the MODEL 851 with quality and reliability. MARK-2 are: For over 50 years FURUNO Electric • Traditional FURUNO reliability and quality Company has enjoyed an enviable reputation in a compact, lightweight and low-cost for in
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SYSTEM CONFIGURATION Antenna unit Navigation Device Remote Display FMD-811 Echo Sounder Gyro Converter Gyro- AD-100 compass External Alarm Integrated Heading Buzzer OP03-169 Sensor PG-1000 Rectifier Option RU-3423 Ship's Mains Ship's Mains 100/110/115 VAC 12-24 VDC 200/220/230 VAC 1φ, 50/60 Hz MODEL 851 MARK-2 v
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1. PRINCIPLE OF OPERATION 1.1 What is Radar? 1.3 How Radar Determines Range The term "RADAR" is an acronym meaning RAdio Detection And Ranging. It is a Radar determines the distance to the target device which measures the time it takes for by calculating the time difference between a pulsed signal to be reflected back from the transmission of a radar signal and the an object. reception of the reflected echo. It is a known fact that radar waves travel at a 1.2 How Ships Determined nearly constant
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1.5 Radar Wave Speed and 1.6 The Radar Display Antenna Rotation Speed Targets are displayed on what is called a Plan Position Indicator (PPI). This display The speed of the radar waves out to the is essentially a polar diagram, with the target and back again as echoes is transmitting ship’s position at the center. extremely fast compared to the speed of Images of target echoes are received and rotation of the antenna. By the time radar displayed at their relative bearings, and at echoes have ret
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2. OPERATION 2.1 Control Description Omnipad Shifts cursor, VRM and EBL; selects items and options on menu. Registers selection ENT MENU Opens/closes menus. on menus. HM Adjusts GAIN, ECHO Erases heading marker; OFF STC, A.C RAIN selects cursor data (Lat/Long, R/B); and FTC. outputs cursor position. Selects radar range. RANGE TONE BRILL Adjusts display Adjusts display brilliance. tone. Turns the EBL EBL VRM Turns the VRM on/off. on/off. Plots targets' trails. TRAIL RINGS Turns the range rings o
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2.2 Display Indications and Markers Heading (requires heading data) Echo trail, AUTO tuning Range Echo trail elapsed time, AUTO HDG 326.8˚ TRAIL echo trail time, tuning 0:00 NM 15S 1.5 Range ring interval indicator G ( IN ) 0.5 Presentation mode FTC1 CU Guard zone OFF Off center CENTER ES FTC IR SP Pulsewidth (rain clutter suppressor) Heading marker Echo stretch Interference rejector Guard zone area Range rings Cursor EBL VRM Range and bearing to VRM EBL
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Note: When the heading signal is lost, the Tips for selecting the range HDG readout at the top of the screen • When navigating in or around crowded shows ***.*. This warning stays on harbors, select a short range to watch when the heading signal is restored for possible collision situations. to warn the operator that the readout may be unreliable. After confirming • If you select a lower range while on the heading readout (if necessary, open water, increase the range adjust it), the warning may
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2. Press the omnipad at 6 o’clock/12 2.7 Adjusting Control Panel o’clock to select item to adjust. Current Illumination selection is circumscribed by dashed Procedure rectangle. 1. Press the [MENU] key. 3. Press the [ENT] key. 2. Press the omnipad at 6 o’clock to 4. Press the omnipad at 3 o’clock/9 select Backlight/Brilliance and press o’clock to set level. the [ENT] key. 5. Press the [ECHO] key to finish. 3. Press the omnipad at 6 o’clock to How to adjust the GAIN (sensitivity) select Panel. 4.
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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 antenna above the water, the further the Sea clutter at STC adjusted; display center sea clutter suppressed. clutter will extend. Sea clutter appears on the display as many small echoes which Figure 2-5 Effect of STC might affect radar performance. (See the left-hand figure in Figure 2-5). How
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Adjusting FTC Manual tuning To suppress rain clutter from heavy storms The default tuning method is automatic. To or scattered rain clutter, adjust the FTC switch to manual tuning; among 0, 1 and 2 (0 is off). The FTC circuit 1. Press the [MENU] key to open the splits up these unwanted echoes into a menu. speckled pattern, making recognition of 2. Press the omnipad at 6 o’clock to solid targets easier. FTC and selected level select Tuning. appear at the top right-hand corner of the display when
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By VRM 2.11 Measuring the Bearing 1. Press the [VRM] key to display the There are two ways to measure the bearing VRM. to a target: by the cursor, and by the EBL (Electronic Bearing Line). 2. Press the omnipad to place the VRM on the inside edge of the target. By cursor 3. Check the VRM readout at the bottom left-hand corner of the display to find Operate the omnipad to bisect the target the range to the target. with the cursor intersection. The bearing to the target appears at the bottom right-
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Tips for measuring the bearing 2.12 Menu Operation • Bearing measurements of smaller The menu, consisting of six sub menus, mostly contains less-often used functions targets are more accurate; the center of larger target echoes is not as easily which once preset do not require regular adjustment. To open or close the menu, identified. press the [MENU] key. You can select • Bearings of stationary or slower moving items and options on the menu with the targets are more accurate than bearings omnip
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Menu description Table 2-1 Menu description Menu Function 1. Selects control panel backlighting; four is BACKLIGHT/BRILLIANCE MENU maximum backlighting. Select item and option 2. Selects brilliance for echo trails and by keys. markers; two is maximum brilliance. 1. Panel 1 2 3 4 2. Echo Trail 1 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Press HM-OFF to temporarily hide menu. 1. Selects pulselength for 1.5
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2.13 Selecting the Display Each time the key is pressed the display mode changes in one of the sequences Mode shown below, depending on equipment The display mode may be selected with the connected and menu settings. [DISP MODE] key. Four modes are available (with navigation input): Normal, Normal + Window, Normal + Nav Data, and Normal + Window + Nav Data. Window Display WIDE / ZOOM Nav Display ON / OFF ZOOM Window display (Zoom or Wide) VRM EBL +CURSOR
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2.14 The Window Display 3. Press the [ENT] key to confirm the zoom area in the window display. The The window display appears at the bottom area selector becomes a dashed circle left (or right) 1/4 of the display. Two types of and the cursor can be moved window displays are available: zoom and independently. wide. Zoom doubles the size of the area selected by the operator, and wide (range- To reselect area to zoom, press [ENT] or up) compresses and displays the entire [DISP MODE] and follow step
