Page 3 - SAFETY INSTRUCTIONS; DANGER; Radio Frequency Radiation Hazard; Distances at which RF radiation levels of 100 and 10 W/m; Stay away from transmitting antenna.
i SAFETY INSTRUCTIONS DANGER Radio Frequency Radiation Hazard The radar antenna emits electromagnetic radio frequency (RF) energy which can beharmful, particularly to your eyes. Never look directly into the antenna aperture from aclose distance while the radar is in operation or expose yourself to t...
Page 4 - ii; Do not open the equipment.; Electrical shock can result.; CAUTION
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 exposureto RF radiation hazard. WARNING Do not open the equipment. Improper handling can result in electricalshock. Only qualified personnel...
Page 5 - Durable brushless antenna motor.; FOREWORD
iii C o n g r a t u l a t i o n s o n y o u r c h o i c e o f t h eFURUNO MODEL 1761 MARK-3 Marine Ra-dar. We are confident you will see why theFURUNO name has become synonymouswith quality and reliability. For over 50 years FURUNO Electric Com-pany has enjoyed an enviable reputation forinnovative a...
Page 6 - iv; TABLE OF CONTENTS; PRINCIPLE OF OPERATION; How Ships Determined Position Before; SHOOTING
iv TABLE OF CONTENTS FOREWORD .............................. iii MENU TREE ............................... v TABLE OF CONTENTS BYINDICATION, MARKER ............. vi SYSTEM CONFIGURATION ..... vii 1. PRINCIPLE OF OPERATION 1.1 What is Radar? .............................. 1-1 1.2 How Ships Determined...
Page 7 - MENU TREE; MENU KEY
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/+C...
Page 8 - TABLE OF CONTENTS BY
vi TABLE OF CONTENTS BY INDICATION, 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 EBL45.6 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)...
Page 9 - vii; SYSTEM CONFIGURATION; Scanner Unit
vii SYSTEM CONFIGURATION *Equivalent to NMEA 0183 Option RDP-099 Navigationdevice IEC 61162* (In/Out) Gyro-compass Gyro Converter AD-100 12/24/32 VDC RectifierRU-3423 115/230 VAC External AlarmBuzzer OP03-21 Scanner Unit XN10A-RSB-0070-065 Display Unit 12 VDC: 10A24/32 VDC: 5A Intergrated Heading Se...
Page 10 - The Radar Display
1-1 1.1 What is Radar? The term “RADAR” is an acronym meaningRAdio Detection And Ranging. Although thebasic principles of radar were developed dur-ing World War 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,...
Page 11 - Figure 1-1 How radar works
1-2 A B C D Own ship(radar) D A B C Heading marker Targets Own shipin 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
Page 12 - Control Description; Figure 2-1 Control panel
2-1 2. OPERATION 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 Turns 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 r...
Page 13 - Economy mode; Selecting the Range; Selecting the range; Tips for selecting the range
2-2 2.2 Turning the Radar On/Off After confirming there are no crew near thescanner unit, press the [POWER] key to turnon the power. The front panel will light up. The magnetrontakes about two minutes and thirty secondsto warm up before the radar can be oper-ated. The time remaining for warm up of t...
Page 14 - Tips on adjusting GAIN; How the A/C SEA control works; Confirm that the sensitivity is properly ad-; control; Tip for adjusting the A/C SEA
2-3 echoes and the background noise on the dis-play. To adjust receiver sensitivity, transmit on longrange, 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 usefulto reduce the gain slightly to improverange ...
Page 15 - Tuning the Radar Receiver; Figure 2-4 Heading marker
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 theship is rolling. However, by this design theunit will also detect rain clutter (rain, snow,hail, etc.) in the same manner as normal tar-gets. Figure 2-...
Page 16 - Place the VRM on the inside edge of the; Figure 2-5 Measuring Range by the Cursor; Measuring the Bearing
2-5 2.13 Select the Cursor Data Display When connecting with NAV (IEC61162 for-mat) and gyro converter (IEC61162 or AD-10 format), this radar can show the cursorposition by Latitude/longitude at bottom ofscreen. Each time pressing [HM OFF] key, the datawill change from Range/Bearing to Latitude/long...
Page 17 - Tips on measuring bearing; Shifting and Zooming the; Shift
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. To erase the EBL,press and hold down the [EBL] key forabout three seconds. 6.0 NM2.0 EBL1 bearingR...
Page 18 - cation “ZOOM” appears and brinks.; Figure 2-8 Shifting and zooming the display; Figure 2-9 MENU Display
2-7 2. Press the [SHIFT/ZOOM] key. The indi- cation “ZOOM” appears and brinks. 3. To turn off 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 [SHI...
Page 19 - Operate the trackball to select “1. ECHO; Suppressing Radar; Figure 2-10 Radar interference; Adjusting Control Panel; Operate the trackball to select “3. PANEL
2-8 2.19 Echo Stretch Normally, the reflected echoes from long dis-tance targets appear on the screen as weakerand smaller blips even through they are com-pensated by the radar’s internal circuitry. TheEcho Stretch function magnifies these smallblips. 1. Press the [MENU] key to open the menu. 2. Ope...
Page 21 - Figure 2-11 Setting Guard Zone; Watchman; Figure 2-13How watchman works
2-10 Note 2: A target echo does not always meana landmass, reef, ships or surface objects butcan imply returns from sea surface or pre-cipitation. As the level of these returns varieswith environment, the operator should (prop-erly) adjust the A/C SEA, A/C RAIN, FTC andGAIN to be sure target echoes ...
Page 22 - Figure 2-14 Plotting Indications; Plot Brilliance; Navigation Data Display
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. O p e r a t e t h e t r a c k b a l l t o s e l e c t “ 7 . WATCHMAN” . 4. Press the [RANGE] key to select a trans- mission interval. 5. Press the [MENU] key to actuate ...
Page 23 - Figure 2-15 Navigation Data on the Screen
2-12 If the output format is FURUNO CIF a jumperwire must be connected to “JUP1” on the SPUBoard in the display unit. Note that for CIFformat the bearing measurement method(Magnetic or True) does not appear for bear-ing to waypoint data. Figure 2-15 Navigation Data on the Screen MAG 115.0° 12 NM 3.0...
Page 24 - Figure 3-1 Multiple echoes
3-1 3. FALSE 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 itcan be detected by the side-lobes as well asthe main-lobe, the side-lobe echoes may berepresented on both sides of the true echoat...
Page 25 - Figure 3-3 Indirect echoes; Blind and Shadow Sectors; Figure 3-4 Blind and shadow sectors
3-2 3.3 Indirect Echoes Indirect echoes may be returned from eithera passing ship or returned from a reflectingsurface on your own ship, for example, astack. In both cases, the echo will return froma legitimate contact to the scanner by thesame indirect path. The echo will appear onthe same bearing ...
Page 26 - s) through the band before beginning a rela-; Figure 3-5 SART display; Summary to detect SART response; Use range scale of 6 or 12 nm as the; General remarks on receiving SART; Radar range scale
3-3 3.5 SART (Search and Rescue Transponder) A Search and Rescue Transponder (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 repetitivelyacross the complete radar frequency band.Wh...
Page 27 - Preventive Maintenance; Table 4-1 Recommended maintenance program
4-1 This chapter tells you how to keep your ra-dar in good working order. Before reviewingthis chapter please read the safety informa-tion which follows. Turn off the power before performing any maintenance ortroubleshooting procedure. DANGER Hazardous voltages can shock, burn or cause death. Only q...
Page 28 - Table 4-2 Troubleshooting table
4-2 4.3 Troubleshooting Table 4-2 contains simple troubleshootingprocedures which you can follow to try to re-store normal operation. If you cannot restorenormal operation, do not attempt to checkinside any unit of the radar system. Any re-pair work is best left to a qualified technician. Table 4-2 ...
Page 29 - Table 4-3 Life expectancy of magnetrons
4-3 4.4 Life Expectancy of Magnetron The following table shows the life expectancyof the magnetrons. Table 4-3 Life expectancy of magnetrons e p y T n o r t e n g a M . o N e d o C y c n a t c e p x e e f i L 8 4 2 5 G M 1 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...
Page 30 - SPECIFICATIONS OF MARINE RADAR; TRANSCEIVER MODULE
SP - 1 E3481S01B SPECIFICATIONS OF MARINE RADAR MODEL 1761 MARK-3 1. GENERAL 1.1. Indication System PPI Daylight display, raster scan, 8 tones in monochrome 1.2. Range, Pulselength (PL) & Pulse Repetition Rate (PRR) Range (nautical miles) PL PRR 0.125 0.25 0.5 0.75 1.5 2 3 4 6 8 12 16 24 36 48 S...
Page 31 - ENVIRONMENTAL CONDITION
SP - 2 E3481S01B 4. DISPLAY UNIT 4.1. Indication System PPI Daylight display, raster scan, 8 tones in monochrome 4.2. Picture Tube 7 inch rectangular monochrome CRT Effective display area more than 100 mm 4.3. Range, Range Interval, Number of Rings Range (NM) 0.25 0.5 0.75 1 1.5 2 3 4 6 8 12 16 24 4...
Page 32 - COMPASS SAFE DISTANCE; Unit
SP - 3 E3481S01B 7. COATING COLOR 7.1. Display Unit Panel: N3.0, Chassis: 2.5GY5/1.5 7.2. Antenna Unit N9.5 8. COMPASS SAFE DISTANCE 8.1. Display Unit Standard: 0.50 m Steering: 0.40 m 8.2. Antenna Unit Standard: 1.00 m Steering: 0.75 m
Page 33 - Index
IN-1 Index A A/C RAIN control .................................... 2-4A/C SEA control .................................... 2-3 B Bearing measurement ............................. 2-5Blind sectors ............................................ 3-2Brilliance ........................................... 2...
