User manual FURUNO 1942

[. . . ] C Yo u r L o c a l A g e n t/D e a le r 9-52, A shihara-cho, N ishinom iya, Japan Te l e p h o n e : Te l e f a x : 0 7 9 8 -6 5 -2 111 0798-65-4200 A ll rig h ts re s e rv e d . Printed in Japan FIRST EDITIO N P : : JAN. OM E-34410 (H IM A ) M O D E L1832/1932/1942 SAFETY INSTRUCTIONS "DANGER", "WARNING" and "CAUTION" notices appear throughout this manual. It is the responsibility of the operator and the installer of the equipment to read, understand and follow these notices. If you have any questions regarding these safety instructions, please contact a FURUNO agent or dealer. WARNING Do not open the equipment. [. . . ] Mark Brill" on the OTHER menu adjusts the brilliance of markers such as the cursor. F1: Shift (brief press) or Zoom (long press) F2: Ring brillience How to register menu items 3. 14 Outputting Target Position Target position data can be output to the navaid in IEC 1162 format. Press [A/C SEA] (F1) or [A/C RAIN] (F2) to open the function menu. [ SETTING FOR F1 KNOB ] SSel by omnipad & press ENT. S <Press MENU key to escape> SHIFT/ ZOOM EBL OFFSET SHIFT ZOOM RINGS MODE NOISE REJECT TRAIL TIME ALARM LEVEL MARK BRILL VRM UNIT CUSOR POSITN COLLI SION DISP DATA PULSE LENGTH TRAIL TONE DEAD SECTOR CHARA CTERS NAV TALKER VECTOR LENGTH AUTO ACQ STBY DISP ECHO STRTCH TUNE A/M WATCH MAN OTHER MENU WPT MARK VECTOR REF NO FNCTN INT REJECT TRAIL ON/OFF GUARD IN/OUT PANEL DIMMER EBL REF OWN POSITN HIS TORY Figure 3-11 Function menu 3. FALSE ECHOES Occasionally false echoes appear on the screen at positions where there is no target. The operator should familiarize himself or herself with the appearance and effects of these false echoes, so as not to confuse them with echoes from legitimate contacts. sented on both sides of the true echo at the same range, as shown in Figure 4-2. They can be reduced through careful reduction of the sensitivity or proper adjustment of the A/C SEA. True echo Main-lobe Side-lobe Sprious target Antenna 4. 1 Multiple Echoes Multiple echoes occur when a short range, strong echo is received from a ship, bridge, or breakwater. A second, a third or more echoes may be observed on the display at double, triple or other multiples of the actual range of the target as shown in Figure 4-1. Multiple reflection echoes can be reduced and often removed by decreasing the sensitivity or properly adjusting the A/C SEA. True echo Figure 4-2 Side-lobe echoes 4. 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 antenna by the same indirect path. The echo will appear on the same bearing of the reflected surface, but at the same range as the direct echo. Indirect echoes may be recognized as follows: · they usually occur in a shadow sector · they appear on the bearing of the obstruction but at the range of the legitimate contact · when plotted, their movements are usually abnormal, and · their shapes may indicate they are not direct echoes. Own ship Multiple echo Figure 4-1 Multiple echoes 4. 2 Side-lobe Echoes Every time the antenna rotates, some radiation 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 repre- 20 4. 4 Blind and Shadow Sectors Direct path Target Heading line Indirect path Obstruction Antenna (mast, funnel. etc. ) Target Indirect path Funnels, stacks, masts, or derricks in the path of antenna may reduce the intensity of the radar beam. If the angle subtended at the antenna is more than a few degrees a blind sector may be produced. Within the blind sector small targets at close range may not be detected while larger targets at much greater ranges may be detected. in path of radar beam Direct path Own ship Indirect echo Heading line True echo Bridge Wharf Indirect echo Indirect echo Blind sector (no echo) Size of blind sector depends on target size and range. Figure 4-3 Indirect echoes Figure 4-4 Blind and shadow sectors 21 5. MAINTENANCE & TROUBLESHOOTING This chapter tells you how to keep your radar in good working order. Before reviewing this chapter please read the safety information which follows. 5. 1 Preventative Maintenance Regular maintenance is important for good performance. Always keep the equipment as free as possible from dirt, dust, and water splashes. A maintenance program should be established and should at least include the items listed in table 5-1. DANGER Turn off the power before performing any maintenance or troubleshooting procedure. Hazardous voltages can shock, burn or cause death. Only qualified personnel totally famillier with electrical circuits should work inside the units. 5. 2 Replacing the Fuse The fuse in the power cable protects the equipment against reverse polarity or ship's mains, overcurrent, and equipment fault. Never use an incorrect fuse ­ serious damage to equipment may result and void the warranty. 12 V: 10 A fuse 24/32 V: 5 A fuse RF RADIATION HAZARD The radar antenna emits high frequency radio radiation which can be harmful, particularly to your eyes. Never look directly into the antenna from a distance of less than two feet when the radar is in operation as you could injure the cornea of your eyes. Always make sure the radar is set to stand-by or is turned off before starting work on the antenna unit. Table 5-1 Recommended maintenance program Period 3 to 6 months Item Exposed nuts and bolts on antenna unit Antenna radiator (1932/1942) Check point Check for corroded or loosened nuts and bolts. [. . . ] When a target ship has passed clear of own ship, the CPA is displayed and the TCPA appears as "**. *". and beyond this it is indicated as TCPA>99. 9 min. Mode and length of Vectors CPA/TCPA Alarm Visual and audible alarm are generated when the predicted CPA and TCPA of any target become less than their preset limits. The Auto plotter ARP-10 continuously monitors the predicted range at the Closest Point of Approach (CPA) and predicted time to CPA (TCPA) of each tracked target to own ship. When the predicted CPA of any target becomes smaller than a preset CPA alarm range and its predicted TCPA less than a preset TCPA alarm limit, the ARP-10 releases an audible alarm. [. . . ]