User manual FURUNO CH-270 OPERATORS MANUAL

[. . . ] Back COLOR LCD SEARCHLIGHT SONAR CH-270 Your Local Agent/Dealer 9-52 Ashihara-cho, Nishinomiya 662-8580, JAPAN Telephone : Fax : 0798-65-2111 0798-65-4200 All rights reserved. Printed in Japan FIRST EDITION : JUN. OME-13220 ( YOSH ) CH-270 *00014699501* *00014699501* *00014699501* *OME13220B20* *OME13220B20* *OME13220B20* SAFETY INSTRUCTIONS WARNING ELECTRICAL SHOCK HAZARD Do not open the equipment. Immediately turn off the power at the switchboard if water leaks into the equipment or something is dropped in the equipment. Immediately turn off the power at the switchboard if the equipment is emitting smoke or fire. [. . . ] HORIZONTAL MODE Fish schools A fish school appears as a mass of echoes on the screen. The color of the mass shows the density of fish schools on the sonar beam. To find distribution and center point of a fish school, try several different tilt angles. (A) Sea surface fish Tilt angle: 0° to 10° Bottom echo not displayed because of decreased tilt angle. Sea surface reflections are present. Fish school Sea surface reflections (B) Midwater, bottom fish Tilt angle: 30° or more Fish echo which appears before bottom can be detected. Bottom Tilt angle: 0° to 20° Fish echo which appears together with or after bottom can be detected. Fish school Fish school Large midwater fish school is present. Bottom When the tilt angle is shallow, the reflection echo from bottom is weak and the fish echo which appears from bottom is easy to find. Fish schools 2-27 2. HORIZONTAL MODE Sea surface reflections To reduce sea surface reflections, set the tilt angle to 5° or lower, so the upper edge of the sonar beam does not hit the sea surface, or adjust TVG. When a decreased tilt angle is used, sea surface reflections cover a large area as illustrated below. Sea surface Tilt angle indication 8° Sea surface reflections Sea surface 8° Sea surface reflections Wake A wake produced by own ship or another ship can be a strong reflecting object when a decreased tilt angle is used. As the wake appears as a thick continuous line, it can be easily distinguished from a fish school. A wake contains many air bubbles which attenuate ultrasonic energy, making it difficult to sound beyond the wake. Other ship Own ship Own ship's screw noise Wake produced by other ship Own ship's screw noise Own ship's wake (produced when own ship turned) Wake 2-28 2. HORIZONTAL MODE Sidelobe echo (false echo) An ultrasonic wave is emitted in the direction set by the [TILT] control (main beam), however there are some emissions outside the main beam. The energy of the sidelobe is fairly weak but when the water is comparatively shallow and the bottom is rocky and hard, strong signals are detected by the sidelobe. These are represented on the display as a false echo as shown below. Mainlobe echo Sidelobe Sidelobe echo Mainlobe The bottom echo detected by sidelobe appears at a certain tilt angle when the sidelobe points vertically. Also, poor soundome projection may result in a similar false echo. Sidelobe echoes Noise and interference When the fishing ground is crowded with many fishing boats, the sonar is subject to interference from ultrasonic equipment (echo sounder or sonar) on other boats as well as those on own ship. For instance, interference from the sonar on other boats will show itself on the display as in (A) in the figure below. This interference can be suppressed by changing the Tx rate on the COM1 menu. Noise from marine life shows itself on the displays as in (B) in the figure below. This type of noise can be suppressed with the interference rejector on the COM1 menu. (A) Inteference from other sonars (yours or other's) (B) Interference from marine life Noise and interference 2-29 2. HORIZONTAL MODE 2. 14. 3 Combination display examples Horizontal/history display Press the key to display the horizontal/history display. Tilt angle Cursor position data 17 14 B148° + Own ship marker Train position Range Tilt angle indicator R 40 m T 40° 25 30 Interference rej. ON Target lock indicator Transducer status indicator Position in latitude and longitude* Course*, speed* 34° 12. 213' W CSE 357° SPD 9. 9 kt Fish echo Bottom echo Cursor * Requires appropriate sensor input. Horizontal Display (main window) History Display (sub window) Horizontal/history display The horizontal display appears in the main window; the history display in the sub window. The length of the picture displayed in the history display is equal to about four full-circle pictures. [. . . ] 1. 0 kHz (external speaker required) Event Mark 5 points Target Lock (three functions, selected on menu) Scanning Reverse Scanning orientation changed by pressing key Position Search Auto-search for marker setting position Echo Search Auto-search for signal level in a search zone, or manual search Picture Color 2. 5 2. 6 2. 7 3. HULL UNIT 3. 1 3. 2 3. 3 3. 4 Transducer Travel Raise/lower Time Allowable Ship's Speed Stabilizer 350 mm or 250 mm 30 s at 350 mm travel, 4 s at 250 travel 20 knot or less (15 knot during raise/lower operation) Within 30°, optional motion sensor or clinometer required SP-1 SPECIFICATIONS 3. 5 Horizontal Mode Control Scanning Angle: 6° to 360°, 24° step Scanning Center: 6° steps, 360° setting available Scanning Step Angle: Normal: 6°, High speed: 12° Elevation Angle: +5° to 90°, 1° step Time to Train Full Circle: Range (m) Time (sec) Norm Fast 10 11 11 20 11 11 40 11 11 60 11 11 80 11 11 100 11 11 120 11 11 160 14 13 200 17 14 250 21 16 300 25 18 400 33 22 500 41 26 600 49 30 800 65 38 3. 6 Vertical Scan Mode Control Scanning Angle: 6° to 180°, 12° step Scanning Center: 0° to 180°, 6° step Scanning Step Angle: Normal: 3°, High speed: 6° Time to Train: 360°, 6° step Transceiver Beam Width: 8° (at 3dB/full circle). I/O INTERFACE 4. 1 4. 2 4. 3 Data Format Input Output IEC 61162-1 (NMEA 0183 Ver 1. 5/2. 0) DBS, DBT, DPT, GGA, GLL, HDG, HDM, HDT, MDA, MTW, RMA, RMC, VDR, VHW, VTG TLL 5. POWER SUPPLY 5. 1 5. 2 5. 3 Transceiver Unit Hull Unit Rectifier 12-32 VDC: 4. 7-1. 8 A 12/24 VDC: 4. 0/2. 5 A Max. [. . . ]