Furuno 1761 MARK-3 manuel d'utilisation

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C 9- 52, Ashi har a- cho, N i shi nom i y a, Japan T el ephone: 0798- 65-21 1 1 T el ef ax: 0798-65- 4200 Y our Local Agent / D eal er A ll r i g ht s reser ved. PU B . N o. O M E-34810 M O D E L 1761 M AR K - 3 ( YO S H ) FI R S T E D I T I O N : A U G . 1998 D : JU L. 10, 2001 Print ed in Japan[...]

i SAFETY INSTRUCTIONS DANGER Radio Frequency Radiation Hazard The radar antenna emits electromagnetic radio frequency (RF) energy which can be harmful, particularly to your eyes. Never look directly into the antenna aperture from a close distance while the radar is in operation or expose yourself to the transmitting antenna at a close distance. Dis[...]

ii DANGER Before turning on the radar make sure no one is near the scanner unit. Prevent the potential risk of someone begin struck by the rotating antenna and exposure to RF radiation hazard. WARNING Do not open the equipment. Improper handling can result in electrical shock. Only qualified personnel shold work inside the equipment. Do not disasse[...]

iii Congratulations on your choice of the FURUNO MODEL 1761 MARK-3 Marine Ra- dar . We are confident you will see why the FURUNO name has become synonymous with quality and reliability . For over 50 years FURUNO Electric Com- pany has enjoyed an enviable reputation for innovative and dependable marine electron- ics equipment. This dedication to exc[...]

iv T ABLE OF CONTENTS FOREWORD .............................. iii MENU TREE ............................... v T ABLE OF CONTENTS BY INDICA TION, MARKER ............. vi SYSTEM CONFIGURA TION ..... vii 1. PRINCIPLE OF OPERA TION 1.1 What is Radar? .............................. 1-1 1.2 How Ships Determined Position Before Radar .....................[...]

v MENU TREE 1. ECHO STRETCH (ON, OFF) 2. I. REJECT (OFF, ON) 3. PANEL DIMMER (0, 1, 2, 3, 4) 4. PLOT INTVL (CONT, 30S, 1M, 3M, 6M) 5. PLOT BRILL (LOW, @ HIGH) 6. RANGE (NM) set with (RING) (1/4, 1/2, 3/4, 1, 1.5, 2, 3, 4, 6, 8, 12, 16, 24, 48) 7. WATCHMAN (OFF, 5M, 10M, 20M) 8. NAV DATA (ON, OFF) 9. EBL/+CURSOR (TRUE, REL) MENU KEY[...]

vi T ABLE OF CONTENTS BY INDICA TION, MARKER MAG 115.0 ¡ SHIFT 12 NM 3.0 NM PLOT 3M FTC IR GUARD VRM 2.62 NM 315.1 R ¡ 9.05 NM EBL 45.6 R ¡ 18:25 ES * WATCHMAN Tuning indicator (P.2-11) Echo stretch (P.2-8) Guard alarm (P.3-4) FTC (P.2-4) EBL (P.2-6) Range ring (P.2-3, 2-5) Interference rejector (P.2-8) VRM range (P.2-5) Cursor data(P.2-5) Beari[...]

vii SYSTEM CONFIGURA TION *Equivalent to NMEA 0183 Option RDP-099 Navigation device IEC 61162* (In/Out) Gyro- compass Gyro Converter AD-100 12/24/32 VDC Rectifier RU-3423 115/230 VAC External Alarm Buzzer OP03-21 Scanner Unit XN10A-RSB-0070-065 Display Unit 12 VDC: 10A 24/32 VDC: 5A Intergrated Heading Sensor PG-1000[...]

1-1 1.1 What is Radar? The term “RADAR” is an acronym meaning RAdio Detection And Ranging. Although the basic principles of radar were developed dur- ing World W ar II, echoes as an aid to naviga- tion 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 shore[...]

1-2 A B C D Own ship (radar) D A B C Heading marker Targets Own ship in center (A) Bird's eye view of situation (B) Radar picture of (A) Range and bearing of a target, relative to own ship, are readable on the PPI. Figure 1-1 How radar works[...]

2-1 2. OPERA TION 2.1 Control Description POWER BRILL SHIFT ZOOM RING EBL VRM MENU RANGE OFF ECONOMY STBY T X GAIN PUSH/HM OFF A/C SEA A/C RAIN T urns power on. Press together with [STBY/TX] key to turn power off. Alternates between stand-by and transmit. Adjusts the brightness of the screen. Selects radar range. The "+" and "-"[...]

2-2 2.2 T urning the Radar On/Off After confirming there are no crew near the scanner unit, press the [POWER] key to turn on the power . The front panel will light up. The magnetron takes about two minutes and thirty seconds to warm up before the radar can be oper- ated. The time remaining for warm up of the magnetron appears at the center of the d[...]

2-3 echoes and the background noise on the dis- play . T o adjust receiver sensitivity , transmit on long range, and adjust the [GAIN] control so back- ground noise is just visible on the screen. Tips on adjusting GAIN • In certain circumstances it may be useful to reduce the gain slightly to improve range resolution, clear up the picture, or red[...]

2-4 2.9 Adjusting the A/C RAIN Control (reducing rain clutter) The vertical beamwidth of the antenna 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. Figure 2-3 shows the appearance of rain clutter on [...]

2-5 2.13 Select the Cursor Data Display When connecting with NA V (IEC61 162 for- mat) and gyro converter (IEC61 162 or AD- 10 format), this radar can show the cursor position by Latitude/longitude at bottom of screen. Each time pressing [HM OFF] key , the data will change from Range/Bearing to Latitude/ longitude and vice versa. When the cursor po[...]

2-6 2. Position the EBL so it bisects the target by operating the trackball. 3. Press the [EBL] key again to fix the EBL to the position. 4. Check the bearing readout to find the bearing of the target. T o erase the EBL, press and hold down the [EBL] key for about three seconds. 6.0 NM 2.0 EBL1 bearing R: Relative Bearing T: True Bearing* 40.0° R [...]

2-7 2. Press the [SHIFT/ZOOM] key . The indi- cation “ZOOM” appears and brinks. 3. T o turn of f the zoom, press the [SHIFT/ ZOOM] key again, or change the range. Cursor Place cursor where desired. Display magnifies. Press the [SHIFT/ZOOM] key. Display shifts. (Normal display) SHIFT ZOOM Press the [SHIFT/ZOOM] key. Press the [SHIFT/ZOOM] key. F[...]

2-8 2.19 Echo Stretch Normally , the reflected echoes from long dis- tance targets appear on the screen as weaker and smaller blips even through they are com- pensated by the radar ’s internal circuitry . The Echo Stretch function magnifies these small blips. 1. Press the [MENU] key to open the menu. 2. Operate the trackball to select “1. ECHO [...]

2-9 2.22 Selecting Ranges This radar has 14 ranges, some which you may not require. Y ou can select or deselect ranges as follows. 1. Press the [MENU] key to open the menu. 2 . Operate the trackball to select “6. RANGE”. 3. Press the [RANGE] key to place the un- derline under the range you want to se- lect or deselect. 4. Press the [RING] key t[...]

2-10 Note 2: A target echo does not always mean a landmass, reef, ships or surface objects but can imply returns from sea surface or pre- cipitation. As the level of these returns varies with environment, the operator should (prop- erly) adjust the A/C SEA, A/C RAIN, FTC and GAIN to be sure target echoes within the guard zone are not overlooked by [...]

2-11 1. Determine the guard zone (usually 360 degrees) with the guard alarm function. 2. Press the [MENU] key to open the menu. 3 . Operate the trackball to select “7. W A TCHMAN” . 4. Press the [RANGE] key to select a trans- mission interval. 5 . Press the [MENU] key to actuate the watchman mode. The indication “W A TCH- MAN” appears and t[...]

2-12 If the output format is FURUNO CIF a jumper wire must be connected to “JUP1” on the SPU Board in the display unit. Note that for CIF format the bearing measurement method (Magnetic or T rue) does not appear for bear- ing to waypoint data. Figure 2-15 Navigation Data on the Screen MAG 115.0 ° 12 NM 3.0NM IR GUARD Waypoint LL 34°38.99S 135[...]

3-1 3. F ALSE ECHOES 3.2 Side-lobe 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 4[...]

3-2 3.3 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 scanner by the same indirect path. The echo will appear on the same bearing of the reflected surface, but at the same ra[...]

3-3 3.5 SART (Search and Rescue T ransponder) A Search and Rescue T ransponder (SART) may be triggered by any X-Band (3 cm) ra- dar within a range of approximately 8 n.miles. Each radar pulse received causes it to trans- mit a response which is swept repetitively across the complete radar frequency band. When interrogated, it first sweeps rapidly ([...]

4-1 This chapter tells you how to keep your ra- dar in good working order . Before reviewing this chapter please read the safety informa- tion which follows. Turn off the power before performing any maintenance or troubleshooting procedure. DANGER Hazardous voltages can shock, burn or cause death. Only qualified personnel totally famillier with ele[...]

4-2 4.3 T roubleshooting T able 4-2 contains simple troubleshooting procedures which you can follow to try to re- store normal operation. If you cannot restore normal operation, do not attempt to check inside any unit of the radar system. Any re- pair work is best left to a qualified technician. T able 4-2 T roubleshooting table . . . f I. . . t u [...]

4-3 4.4 Life Expectancy of Magnetron The following table shows the life expectancy of the magnetrons. T able 4-3 Life expectancy of magnetrons e p y T n o r t e n g a M. o N e d o Cy c n a t c e p x e e f i L 8 4 2 5 G M1 2 1 - 6 1 1 - 0 0 0 s r u o h 0 0 0 , 3 - 0 0 0 , 2 ) y b - d n a t s g n i d u l c n I ( 1 7 5 3 E9 2 5 - 7 3 1 - 0 0 0[...]

SP - 1 E3481S01B SPECIFI CA T I ONS OF MA RINE RADA R MO DEL 1761 M ARK-3 1. GENERAL 1.1. I ndication Sy stem PPI Dayli ght displ ay, raster scan, 8 tones i n monochr ome 1.2. Range, Pul selength ( PL) & Pulse R epetiti on Rate (PR R) Range (naut i cal m i l es) PL PRR 0.125 0.25 0.5 0. 75 1.5 2 3 4 6 8 12 16 24 36 48 SP 2100 Hz 0. 08 µ s MP 1[...]

SP - 2 E3481S01B 4. DI SPL AY UNIT 4.1. I ndication Sy stem PPI Dayli ght displ ay, raster scan, 8 tones i n monochr ome 4.2. Pict ure Tube 7 inch r ectangular monochr ome C RT Eff ecti ve displ ay area m ore than 100 m m 4.3. Range, R ange Inter val, Num ber of Rings Range (N M ) 0.25 0.5 0.75 1 1.5 2 3 4 6 8 12 16 24 48 Ri ng Inter val ( NM ) 0.1[...]

SP - 3 E3481S01B 7. COATING COL O R 7.1. Di splay U nit Panel: N 3.0, Chassis : 2.5GY5/1.5 7.2. Antenna Unit N9.5 8. CO MPASS SAFE DIST ANCE 8.1. Di splay Uni t Standard: 0.50 m Steeri ng: 0.40 m 8.2. Antenna Unit Standard: 1.00 m Steeri ng: 0.75 m[...]

IN-1 Index A A/C RAIN control .................................... 2-4 A/C SEA control .................................... 2-3 B Bearing measurement ............................. 2-5 Blind sectors ............................................ 3-2 Brilliance ........................................... 2-2, 2-8 BRILL key .............................[...]