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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 : AUG. 1998 A ll r i g hts r e ser v ed. Printed in Japan D : JUL. 10, 2001 PUB. No. OME-34810 M O D E L 1761 M A R K - 3 (YO S H )
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SAFETY INSTRUCTIONS DANGER Stay away from transmitting antenna. The radar antenna emits microwave radiation which can be harmful to the human body, particularly the eyes. Never look directly into the antenna radiator from a distance of less than 1 m when the radar is in operation. 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
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DANGER WARNING Use the proper fuse. Before turning on the radar make sure no one is near the Fuse rating is shown in the chapter 5. scanner unit. Use of a wrong fuse can result in equipment damage Prevent the potential risk of someone begin struck by the Do not operate the equipment with wet rotating antenna and exposure hands. to RF radiation hazard. Electrical shock can result. WARNING CAUTION Do not open the equipment. Do not use the equipment for other than its intended purpose. Improp
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FOREWORD Congratulations on your choice of the Features FURUNO MODEL 1761 MARK-3 Marine Ra- Your radar has a large variety of functions, dar. We are confident you will see why the all contained in a remarkably small cabinet. FURUNO name has become synonymous with quality and reliability. The main features of the MODEL 1761 MARK-3 are: For over 50 years FURUNO Electric Com- pany has enjoyed an enviable reputation for ¡ Traditional FURUNO reliability and qual- innovative and dependable marine elec
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TABLE OF CONTENTS 2.21 Adjusting Control Panel Brilliance ...... FOREWORD .............................. iii ..................................................... 2-8 2.22 Selecting Ranges ......................... 2-9 MENU TREE ............................... v 2.23 EBL/Cursor Bearing Reference ... 2-9 2.24 Guard Alarm ................................. 2-9 TABLE OF CONTENTS BY 2.25 Watchman .................................. 2-10 INDICATION, MARKER ............. vi 2.26 Plotting ...............
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MENU TREE MENU KEY 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) v
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TABLE OF CONTENTS BY INDICATION, MARKER Elapsed time (P.2-11) Plotting interval (P.2-11) Plotting (P.2-11) Tuning indicator (P.2-11) MAG (or GYRO) BEARING (option) Echo stretch (P.2-8) Guard alarm (P.3-4) Heading marker (P.2-4) ¡ PLOT 3M MAG 115.0 Range (P.2-2) FTC (P.2-4) 12 NM 18:25 ES Range ring interval (P.2-2) 3.0 NM GUARD * WATCHMAN SHIFT FTC Shift (or Zoom) (P.2-6) IR Interference rejector (P.2-8) Watchman (P.2-10) EBL (P.2-6) Guard zone (P.2-9) Cursor (P.2-5, 6) Range ring (P.2
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SYSTEM CONFIGURATION Scanner Unit XN10A-RSB-0070-065 Navigation IEC 61162* (In/Out) device Display Unit External Alarm Gyro- Gyro Converter RDP-099 Buzzer OP03-21 AD-100 compass Intergrated Heading Sensor PG-1000 12 VDC: 10A 24/32 VDC: 5A Rectifier *Equivalent to NMEA 0183 RU-3423 Option 12/24/32 VDC 115/230 VAC vii
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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 meaning RAdio Detection And Ranging. Although the The bearing to a target found by the radar is basic principles of radar were developed dur- determined by the direction in which the ra- ing World War II, echoes as an aid to naviga- dar scanner antenna is pointing when it emits tion is not a new development. an electronic pulse and then receives a re- turning echo. Each time the sca
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Heading marker Targets Range and bearing of a target, relative to own ship, are A readable on the PPI. D A D 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 1-2
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2. OPERATION 2.1 Control Description (Control) Adjusts sensitivity of radar Turns power on. receiver. Press together with [STBY/TX] key (Switch) 1. Temporarily erases heading to turn power off. GAIN marker. Alternates between stand-by and POWER 2. Change + cursor data from transmit. PUSH/HM OFF OFF R/B to L/L and vice versa. A/C SEA Lights (in green) to show the STBY (Control) Reduces sea clutter caused T X radar
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2.2 Turning the Radar On/Off 2.5 Selecting the Range After confirming there are no crew near the The range selected automatically determines scanner unit, press the [POWER] key to turn the fixed range ring interval, the number of on the power. fixed range rings, pulselength, and pulse rep- etition rate, for optimal detection in short to The front panel will light up. The magnetron long ranges. The range and ring interval ap- takes about two minutes and thirty seconds pear at the top left corner
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echoes and the background noise on the dis- How the A/C SEA control works play. The [A/C SEA] control reduces the amplifi- To adjust receiver sensitivity, transmit on long cation of echoes at short ranges (where clut- range, and adjust the [GAIN] control so back- ter is the greatest) and progressively ground noise is just visible on the screen. increases amplification as the range in- creases, so amplification will be normal at Tips on adjusting GAIN those ranges where there is no sea clutter. •
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Note: In addition to reducing clutter, the FTC 2.9 Adjusting the A/C RAIN can be used in fine weather to clarify the pic- Control ture when navigating in confined waters. (reducing rain clutter) However, with the circuit activated the re- ceiver is less sensitive. Therefore, turn off the The vertical beamwidth of the antenna is de- circuit when its function is not required. signed to see surface targets even when the ship is rolling. However, by this design the unit will also detect rain clutter
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Measuring by VRM 2.13 Select the Cursor Data Display 1. Press the [VRM] key to display a VRM. (The VRM is the dotted ring.) When connecting with NAV (IEC61162 for- 2. Place the VRM on the inside edge of the mat) and gyro converter (IEC61162 or AD- target by operating the trackball. 10 format), this radar can show the cursor position by Latitude/longitude at bottom of 3. Press the [VRM] key again to fix the VRM screen. to the position. Each time pressing [HM OFF] key, the data 4. Check the range
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2. Position the EBL so it bisects the target • Bearings of stationary or slower moving by operating the trackball. targets are more accurate than bearings of faster moving targets. 3. Press the [EBL] key again to fix the EBL to the position. • To minimize bearing errors keep echoes in the outer half of the picture by chang- 4. Check the bearing readout to find the ing the range scale; angular difference bearing of the target. To erase the EBL, becomes difficult to resolve as a target press and h
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2. Press the [SHIFT/ZOOM] key. The indi- 2.18 Menu Operation cation “ZOOM” appears and brinks. The menu, consisting of 9 items, mostly con- 3. To turn off the zoom, press the [SHIFT/ tains less-often used functions which once ZOOM] key again, or change the range. preset do not require regular adjustment. To open or close the menu, press the [MENU] (Normal display) key. You can select menus by using the Place cursor where desired. trackball, then select item with the [RANGE] key. Note: Current se
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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 STRETCH”. Figure 2-10 Radar interference 3. Press the [RANGE] key to select “ON”. 1. Press the [MENU] key to open the menu. The indication “ES” appears at the up
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Before setting the alarm, be sure the [GAIN] 2.22 Selecting Ranges control is properly adjusted, because the au- dible alarm sounds when the fifth or more This radar has 14 ranges, some which you level quantization echoes go into or go out of may not require. You can select or deselect the guard zone. ranges as follows. 1. Mentally create the guard zone you want 1. Press the [MENU] key to open the menu. to display on-screen. See Figure 2-12. 2. Operate the trackball to select “6. 2. Set upper (l
