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All rights reserved. All rights reserved. Printed in Japan Printed in Japan PUB.No. PUB.No. OME-13030 OME-13030 ( ( TENI TENI ) ) CH-37 CH-37 Your Local Agent/Dealer Your Local Agent/Dealer FIRST EDITION : FIRST EDITION : JUL. JUL. 1998 1998 : MAY.
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Continued use of the equipment can cause fire or electrical shock. Contact a FURUNO agent for service. Do not disassemble or modify the equipment. Fire, electrical shock or serious injury can result.
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WORKING WITH THE SONAR OIL Precautions Keep oil away from eyes. Wear protective gloves when working with the oil. The oil can cause inflammation of the eyes. Do not touch the oil. Wear protective gloves when working with the oil. The oil can cause inflammation of the skin.
TABLE OF CONTENTS FOREWORD ... v SYSTEM CONFIGURATION ... vi MENU TREE ... vii OPERATIONAL OVERVIEW 1.1 Control Description... 1-1 1.2 Turning the Power On/Off ... 1-3 1.3 Adjusting Screen Brilliance, Panel Backlighting ... 1-3 1.4 Lowering the Transducer ... 1-3 1.5 Presentation Mode ...
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3.9 Bottom/3D Menu Operation ... 3-8 3.10 Interpreting the Display ... 3-9 3.11 Vertical Fan Mode Indications ... 3-12 3.12 How to Use the Vertical Fan Mode ... 3-13 3D MODE 4.1 Selecting a 3D Display ... 4-1 4.2 Turning Vertical Echoes On/Off ... 4-2 4.3 Changing 3D View Scale Mode and Scale Selection ...
This dedication to excellence is furthered by our exten- sive global network of agents and dealers. The CH-37 is the newest addition to FURUNO’s CH family of sonars. This new sonar is especially designed to provide faster detection capability by sector scanning method and improved operation by rotary controls and trackball.
SECTOR TILT FULL EVENT HALF CUSTOM MODE ENTER CH-37 OPERATIONAL OVERVIEW Switches on and off the entire system. Controls the transducer. Each switch functions as follows: : Raises the transducer. : Lowers the transducer. Selects display mode (from left-hand position):...
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Sub panel Sub-panel 1 LEVEL TIME AUDIO DIMMER BRILL DEGAUSS FAST TRACK AUTO SCAN RANGE TRAIN BOTTOM MODE MENU Sub-panel 2 Function AUDIO DIMMER BRILL Function MENU DEGAUSS FAST SCAN TRACK V:H RANGE AUTO TRAIN Changes the auto and manual train in MENU Figure 1-2 Sub panel 1 and sub panel 2 Description...
1.2 Turning the Power On/Off 1.3 Adjusting Screen Brilliance, Panel Backlighting 1.4 Lowering the Transducer Power on Press the PWR switch on the main panel. The lamp above the switch lights to show that power is turned on. Power off Retract the transducer with the g key on the main panel.
1.5 Presentation Mode Five presentation modes are available with the MODE control: Normal sonar, Normal sonar + combination, Expanded sonar, Vertical fan mode or Vertical fan mode + combination and 3D display mode (front and slant perspective views). Mode (Continued on next page) Presentation Normal sonar mode Normal full circle picture appears on...
Mode Note: Asterisk-marked modes require external signal interface and external E/S interface. Furthermore the E/S key on the sub panel 2 must be turned on. Presentation Vertical fan mode A vertical section of underwater conditions (half-circle area) appears on the entire screen. Vertical fan mode + E/S or sonar A vertical section of underwater conditions (half-circle area) appears...
1.6 Background Color 1.7 Degaussing the Screen The background color is available in deep blue, blue or black, with the HUE key. The screen is automatically degaussed at the interval selected on the SYSTEM SETTING menu. However, when the picture or picture color appears to be distorted, manually degauss the screen with the DEGAUSS key.
GAIN TILT SECTOR FULL EVENT HALF LEVEL TIME AUDIO CUSTOM MODE ENTER DIMMER BRILL CH-37 DEGAUSS FAST TRACK AUTO SCAN RANGE TRAIN BOTTOM MODE MENU MENU Turn on the display unit. Lower the transducer. Adjust the brilliance of the CRT.
2.2 Selecting Range The RANGE control selects the detection (display) range. Se- lect the range according to either the fish species being searched or the depth desired. Normally it is set so that the bottom is traced at the lower part of the screen (like an echo sounder).
2.3 Selecting Sector, Sector Stepping Sector width Sector means the width of the transducer training. The SEC- TOR control selects the training (display) area among six posi- tions. In the full circle mode (360 ) the direction of training is clockwise only.
2.4 Setting the Tilt Angle The tilt angle shows the direction to which the sound wave is emitted. When the sound wave is emitted horizontally, the tilt angle is said to be 0 and when emitted vertically, 90 . To set a tilt angle, operate the TILT control. Watch the tilt angle indication at the top right corner of the screen.
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Case 1 Case 2 Fish School a Bottom Bottom Fish school b Case 1 Figure 2-4 Fish echo and tilt angle Points to consider • Normally, a vertically distributed fish school is a better sonar target than the bottom, because it reflects the transmitted pulse back toward the transducer.
Tilt angle and beam coverage (frequency, 60 kHz, vertical beamwidth, 13 (200) 20(40) 40(80) 60(120) 80(160) 100(200) 200(400) Vertical width of sonar beam 100 m 100 m However if the sea is not calm enough, they will become domi- nant and interfere with observation of wanted echoes. To mini- mize these sea surface reflections and to search surface fish schools effectively, the tilt angle is usually set between 5 and 6 so the upper portion of the beam becomes almost parallel...
2.5 Adjusting Gain Few fish found or difficult to find fish habitat. 2.6 Rejecting Sonar Interference and Noise Most equipment malfunctioning claims result from improper setting of switches and controls. For example, fish, fish habitat or outcrop can not be readily detected by merely increasing the gain.
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Identifying noise source To eliminate noise effectively, you should first identify the source as follows: • Operate all onboard equipment one by one while observing the picture. • Run the boat at various speeds to check if the noise is speed dependent.
2.7 Detecting Fish Schools Aurally Occasionally you will be preoccupied with other tasks and un- able to concentrate on watching the sonar picture. In such cases it would be a good choice to use the audio function. This func- tion enables you to monitor echoes from fish schools and bot- tom through the external speaker (option), of which the volume can be adjusted with the AUDIO control on the sub panel 1.
2) Press the EVENT key to inscribe the event marker. 3) To erase the marker, place the trackball marker outside the echo display area and press the EVENT key. Note: CH-37 stores one event marker. R/B marker 1) Position the trackball marker on the location desired.
2.9 Selecting Training Sector Quickly Figure 2-9 How the SECTOR control and FULL/HALF key work 2.10 Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds Normally the training sector is selected by the SECTOR con- trol. To the training sector more quickly, however, use the FULL/ HALF key.
DIMMER BRILL DEGAUSS FAST TRACK AUTO SCAN RANGE TRAIN BOTTOM MODE MENU 2.11 Suppressing Bottom Tail 2.12 Displaying Surface Fish Clearly (TVG adjustment) 2-12 MENU MENU TX RATE TX PULSE LENGTH : LONG TX OUTPUT POWER : Figure 2-10 How to reduce bottom and surface reflections by reducing Tx output power As described earlier, fish schools near the bottom are some- times difficult to detect because you have to discriminate fish...
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Without TVG function Noise caused by strong reflection of surface turbulence. In the CH-37, the TVG LEVEL and TIME controls compensate for propagation loss. The effective distance is up to 1000 m approximately. Nearer target echoes appear Reduce in larger size.
2.13 Relocating Fish School for Easy Observation 2.14 Finding Fish School Center 2-14 When a fish school is near the edge of the screen and inconve- nient for observation, use the “ ” expanded sonar mode and adjust the TRAIN control (off-center function) to relocate the fish school close to the screen center.
2.15 Sonar Menu Operation Operating procedure 1. Press the MENU key on the sub panel 2. 2. Select the SONAR menu with the arrow keys on the sub Figure 2-14 Sonar menu 3. Select item and setting with the arrow keys. The selected 4.
TX EXT SYNC: If two or more echo sounders or sonars are operated simultaneously, mutual interference may result due to asynchronous keying pulse output. To synchronize keying pulse turn TX EXT SYNC on. IR: Rejects interference. Turn off when no interference exists, otherwise weak echoes may be missed.
L " " L " " With navigation data input, the CH-37 can plot ship’s track on the sonar mode display. The track itself can be turned on/off with the TRACK key. , y l i f i l...
2.18 Interpreting the Display Sounding Beam Tilt When the narrow sounding beam (6-degree step operation) is selected, 60 transmissions are required to complete the full circle detection. 2-18 This section provides the information necessary for interpret- ing the display. How the picture is painted The wide sounding beam is emitted from the soundome at a certain tilt angle (see hatched area in the figure below).
Bottom echoes When the tilt angle is widened, the bottom echo illustrated be- low will appear on the display. When the tilt is narrowed, the bottom trace becomes wider and weaker. By observing the bottom condition on the display, the skipper can prevent net damage.
(A) Sea surface fish Tilt angle: -5 to 10 (B) Midwater, bottom fish Tilt angle: 30 or more Fish echo which appears before bottom can be detected. Tilt angle: -0 to 20 Fish echo which appears together with or after bottom can be detected. 2-20 Fish schools A fish school appears as a mass of echoes on the screen.
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Sea surface reflections To reduce sea surface reflections, set the tilt angle to 5 or higher, so the upper edge of the sonar beam does not hit the sea surface, or adjust TVG. When a narrow tilt angle is used, sea surface reflections cover a large area as illustrated below.
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Sidelobe 2-22 False echo by sidelobe An ultrasonic wave is emitted only in the direction set by the TILT control, however there are some emissions outside the main beam. These are called sidelobes. 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.
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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 operated on other boats will show itself on the display as in (A) in the figure be- low.
2.19 Sonar Mode Indications Trackball marker data North marker* Range marker Bottom echo Bearing marker Range and bearing marker data *: Heading, north marker require current indicator and gyro or log. 2-24 Normal sonar display Fish school D35.0 34 43.261N 135 20.282E Depth, latitude, longitude (Requires navigator)
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Trackball marker data Expanded sonar display Figure 2-24 Indications on the expanded sonar display Sector center marker R 150 Range T 10 Tilt Sector width marker Own ship marker Trackball marker 2-25...
2.20 Application Example Sonar (Horizontal) Mode PURSE SEINING 1 Power ON. TRANSDUCER MODE RANGE BOTTOM TRAWLING 1 Power ON. TRANSDUCER MODE RANGE For bottom trawling, sonar is usually used to detect net hangs ahead rather than to detect fish close to the bottom, since bottom returns usually mask the weaker fish targets close to the bottom.
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Scout-boat Here comes fish school ! 4 Narrow the train area, and track fish school. Fish school Trackball marker Data for fish school pointed by trackball marker (+). TRAIN GAIN Net-boat SECTOR TILT FULL EVENT HALF FULL EVENT HALF Marker can be moved to any position by ro- tating trackball.
TRAIN GAIN SECTOR TILT FULL EVENT HALF LEVEL TIME AUDIO CUSTOM MODE ENTER DIMMER BRILL CH-37 DEGAUSS FAST TRACK AUTO SCAN RANGE TRAIN BOTTOM MODE MENU MENU VERTICAL FAN MODE Turn on the display unit. Lower the transducer. Adjust the contrast and brilliance of the CRT.
3.2 Selecting Range The RANGE control selects the detection (display) range. Se- lect the range according to either the fish species being searched or the depth desired. Normally it is set so that the bottom is traced at the lower part of the screen (like an echo sounder).
3.3 Selecting Bearing for the Vertical Fan Train Indicator Mark TRAIN Train Indicator Mark AUTO TRAIN [Example] [on] Auto Train Sector: 90 (LED lights.) AUTO TRAIN [off] (Manual train) (LED goes off.) Manual train range can be selected either HALF (174 ) or FULL (360 ) on the SYSTEM menu.
3.4 Selecting the Display Sector Sector center, width The SECTOR and the TILT controls determine the display area (sector width) and the display center (sector center) respec- tively. Mode Display Sector (transducer tilting sector) Vertical Fan Mode PORT STBD Display sector (Shaded area) Sector center...
3.5 Automatic Shifting of Own Ship Position 3.6 Rejecting Sonar Interference and Noise Own ship position on the screen is shifted automatically either rightward or leftward according to the direction of the sector center and the display sector width. The figure below shows the own ship position has been shifted rightward on the screen to provide the wider view at port side.
2) Press the EVENT key. 3) To erase the marker, place the trackball marker outside the echo display area and press the EVENT key. Note: CH-37 stores one event marker. Horizontal and Vertical markers 1) Position the trackball marker on the desired location.
3.8 Applying Proper TVG The TVG function is the same as the one explained in the so- nar mode. For best results, set both TVG level and time a little lower than the ones in the sonar mode. The setting is mode on the BOTTOM/3D menu screen and the usual setting for both time and level is 3.
3.9 Bottom/3D Menu Operation Basic procedure 1. Press the MENU key on the sub panel 2. 2. Select BOTTOM/3D with the arrow keys in the sub panel 2. 3. Select item and setting with the arrow keys. The selected 4. To return to the BOTTOM/3D menu, press the menu key Figure 3-9 Bottom/3D menu Bottom/3D menu description TVG (Level): Controls the receiver sensitivity in short to me-...
3.10 Interpreting the Display Vertical Mode (3) Display area Select the bearing of the sounding beam (1) by TRAIN control, the sounding sector center (2) by the TILT control and the display area (3) by the SECTOR control. 3D VIEW SCALE: Determines the depth item, time or distance for 3D display mode.
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Port-starboard picture (bottom) You can see fish echoes at the center-right of the CRT. The bottom is displayed wider as the distance from the ship’s posi- tion increases. Therefore, it may be difficult to discriminate bot- tom fish. Figure 3-11 Port-starboard picture When ship passes over fish schools The sounding beam is directed fore-aft and the display is off- centered* to present a wider view of the area forward of the...
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Display of net hauling This is an example of net hauling display. The location of the net is indicated clearly. (Ship is stopped.) Own ship Backward FORE Figure 3-13 Net hauling and sonar picture False echo In a shallow water (less than 100 m) detection, unwanted ech- oes shown in the figure may appear.
3.11 Vertical Fan Mode Indications Trackball data Net mouth mark Trackball Vertical/Horizontal marker data Figure 3-15 Indications in the vertical fan mode 3-12 Heading Train indicator H-Range V-Range H-Range scale Fish schools Bottom 2nd reflection V-Range scale...
3.12 How to Use the Vertical Fan Mode Auto train [1] TRAWLER (Surface/Mid-water/Bottom) Usage Fish school detection Bottom shape discrimination Relation between fish school and fishing gear 1 Turn on the AUTO TRAIN key on the sub panel 2 and set the direction of the train center to the fore-aft direction.
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3-14 [2] PURSE SEINER Usage Tracking fish Observation of fish movement/bottom shape Confirmation of net forming 1 Approach the fish school while observing their distribution on the sonar mode. 2 While approaching, face the sounding beam toward the fish schools and confirm their distribution. The display shown below is off-centered* to obtain a wider view of the starboard side.
4.1 Selecting a 3D Display Trackball data The 3D mode shows vertical echoes (real time echoes) and a frontal or oblique image of the bottom just passed, like a graphic track plotter. This mode is useful for locating a wreck, a shoal or a fishing reef.
4.2 Turning Vertical Echoes On/Off Oblique image The oblique image is the equivalent of the frontal image ro- tated by 45 counterclockwise. Figure 4-2 Oblique image Vertical echoes, namely, real time echoes, can be turned on or off on the VERT. ECHO OVERLAY field of the BOTTOM/3D menu, which you can display by pressing the MENU key on the sub panel 2.
4.3 Changing 3D View Scale Mode and Scale Selection 4.4 Other Operations The depth (z-axis) of the graph is displayed in either “TIMe” or “DISTance” scale mode. The depth can be set to 500 or 1000 meters in the distance scale mode, or 1/1, 1/2 or 1/4 in the time scale mode.
CUSTOM MODE KEYS ( 5.1 About the Custom Mode Keys 5.2 Customizing the Keys Like the redial feature on a telephone, the custom mode keys record control settings and play them back in a single key stroke. This feature is useful when you need to quickly set up the so- nar according to fishing ground or fish species being searched.
1. Press desired custom mode key ¡, ™ or £. 2. To escape from the custom mode settings, adjust any con- trols. [Example] MODE Fold here RANGE SECTOR TRAIN TILT TILT SECTOR FULL EVENT HALF CUSTOM MODE ENTER CH-37...
6.1 System Setting Menu 3D DISPLAY SHIP’S POSITION CURRENT DATA DEPTH DATA HEADING INDICATION NORTH MARK TRACK HDG/SPD DATA NAV DATA DATA FORMAT FOR NAV2 CIF BAUD RATE TVG CORRECTION UNIT V-MODE MANUAL TRAIN DEGAUSSING INTERVAL FACTORY SETTING EXIT : PRESS MENU KEY Default settings circumscribed.
6.2 Screen Adjustment Table 6-1 System setting menu description . f f t i s . f f n i l . ) r t i s c i t l l u Screen size and position can be adjusted as follows: 1.
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SCREEN ADJUSTMENT H.SIZE H. POSITION V. SIZE V. POSITION DEFLECTION DIST. BRIGHTNESS EXIT : PRESS MENU KEY Effective picture marker (inside) Figure 6-2 Screen adjustment screen 4. Select item with up and down arrow keys. 5. Adjust item with left and right arrow keys: H.SIZE: Sets picture size in horizontal direc- tion.
6.3 System Menu Press the MENU key while turning on the power. The SYSTEM menu appears. SYSTEM MENU SYSTEM SETTING RANGE - SONAR MODE RANGE - VERTICAL FAN MODE RANGE/SHIFT - E/S COLOR LANGUAGE DISPLAY TEST1 - ROM/RAM/KEY TRAIN/TILT TEST SCREEN ADJUSTMENT TEST PATTERN DISPLAY TEST2 - OPERATION...
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3. Select range. 4. Set range. 5. To return to the SYSTEM menu, press the MENU key. 6. To quit, reset the power. Range - vertical fan mode 1. Select RANGE-VERTICAL FAN MODE from the SYSTEM menu. 2. Press the MENU key. RANGE - VERTICAL FAN MODE FACTORY SETTING : EXIT : PRESS MENU KEY...
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Range/shift - e/s 1. Select RANGE/SHIFT - E/S from the SYSTEM menu. 2. Press the MENU key. RANGE/SHIFT - E/S RANGE 1 SHIFT FACTORY SETTING : EXIT PRESS MENU KEY Figure 6-6 Range/shift - e/s screen 3. Select range (shift). 4.
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Color setting The color setting screen allows you to adjust display colors. 1. Select COLOR from the SYSTEM menu. 2. Press the MENU key. COLOR LEVEL : R HUE 1 : 11 TEXT : 13 BKGD : 15 MENU : 15 HUE 2 : 14 TEXT...
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Factory setting menu (restoring default settings) 1. Select DEFAULT from the SYSTEM menu. 2. Press the MENU key. DEFAULT ARE YOU SURE? : EXIT : PRESS MENU KEY NOTE! ALL SETTINGS INCLUDED IN SYSTEM MENU WILL BE CHANGED TO FACTORY SETTING Figure 6-8 Default screen 3.
DUAL MODE: Choose the display to show on the lower 1/3 of the combination display. E/S: Echosounder, BOTTOM: Verti- cal Fan, SONAR: Sonar picture from the CH-37 is displayed like an echosounder picture. The default setting is E/S. NET MOUTH SHIFT: Set the left/right position of the net mouth mark.
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MAINTENANCE & TROUBLESHOOTING 7.1 Maintenance of Display Unit 7.2 Maintenance of Transceiver Unit Good performance depends on regular maintenance. Follow- ing the recommended procedures in this chapter will keep the equipment operating in top condition for years to come. WARNING ELECTRICAL SHOCK HAZARD Do not open the equipment.
7.3 Maintenance of Hull Unit Lubrication Grease the raise/lower screw shaft once a year. Also, grease the raise/lower main shaft (upper part of the grease cotton re- tainer) twice a year. These parts can accessed by removing the raise/lower drive assembly cover. Manual raise/lower of transducer with hand crank Ship’s mains should be supplied to the hull unit to do this check.
7.4 Display Unit Test This test checks the ROM, RAM and keyboard for proper op- eration. 1. Turn on the power while pressing and holding down the MENU key. Release the MENU key when you hear a beep. The SYSTEM menu appears as shown below. SYSTEM MENU SYSTEM SETTING RANGE - SONAR MODE...
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ROM Program version NO. is displayed, ROM RAM and serial ports are checked for proper operation, and Tx fre- quency, roll angle and pitch angle are displayed. Remote Control Box check. Switch is normal if value changes when switch is operated. EXIT : PRESS MENU KEY ** DISPLAY TEST ** PROGRAM NO.
7.5 Train/Tilt Test This test checks the transducer training and tilting functions for proper operation. 1. Turn on the power while pressing and holding down the MENU key. 2. Select TRAIN/TILT TEST with the arrow keys in the sub panel 2. 3.
7.6 Test Pattern BLACK Position check 7.7 Error Messages This test checks display position and colors. 1. Turn on the power while pressing and holding down the MENU key. 2. Select TEST PATTERN with the arrow keys in the sub panel 3.
Transceiver unit error message If the power is not supplied to the transceiver unit, the following message appears on the screen and the buzzer sounds. TRANSCEIVER UNIT POWER OFF (CHECK FUSE ON TRANSCEIVER UNIT) PRESS R/B KEY TO SILENCE ALARM Figure 7-7 Transceiver unit error message If this occurs, turn the power off and check the fuse as the screen suggests.
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Train error message If something is wrong with the train control circuit, the following message appears and the unit stops operating. Turn the PWR switch off and contact your service agent at your earliest con- venience. TRAIN NG Figure 7-9 Train error message Tilt error message If something is wrong with the tilt control circuit, the following message appears and the unit stops operating.
7.8 Troubleshooting Table Symptom No picture Power supply. Fuse. Bottom echo becomes Rough seas. irregular Long range selected. Weak echo TX OUTPUT POWER set to other than "C." TVG effect is excessive. Somewhat strange color BRILL control set too low. The table below provides common symptoms of equipment troubles and the means to rectify them.
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Symptom Color partially irregular Magnet is near the screen. Picture distorted Equipment generating strong mag- netic field is near display unit. Picture contains noise Equipment not grounded properly. Power cable is run alongside the signal cable. Debris may be on sea surface. 7-10 This symptom occurs if equipment which contains a magnet (loudes-...
(1) Display System (2) Color Hue Control (3) Contrast (4) Display Mode (5) Unit Indication CH-37 PPI display on high resolution 15”(381mm) color CRT 16 or 8 color depending on signal strength 1) Normal sonar mode display* 2) Expanded sonar mode display...
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(6) Horizontal Range (7) Vertical Range (8) E/S Range* (9) E/S Shift* (10) Offcenter (11) TVG (12) Clutter (13) Elimination Interference (14) Audio Monitor *: Optional external E/S interface is required. 3. TRANSCEIVER (1) Frequency (2) Output Power (3) Beamwidth (4) Pulselength 4.
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6. ENVIRONMENTAL CONDITION (1) Ambient Temperature (2) Relative Humidity 7. CORTING COLOR (1) Display Unit (2) Hull Unit (3) Transceiver Unit 0°C to 50°C 95% or less (at 40°C) Chassis: 2.5GY5/1.5 Panel: N-3.0 2.5GY5/1.5 2.5G7/2 SP - 3...
¡ ™ £ keys (custom mode keys) 5-1–5-2 3D mode 4-1–4-3 3D view scale (time, distance) 4-3 AUDIO control 2-9 AUTO TRAIN key 3-3 Auto train sector (vertical fan mode) 3-8 Background color 1-6 Beamwidth (vertical fan mode) 3-8 Bottom/3D menu 3-8 BRILL control 1-3 Color adjustment 6-7 Color quantity 2-16...
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Range preset e/s mode 6-4 sonar mode 6-4 vertical fan mode 6-5 Screen adjustment 6-2 SECTOR control sonar mode 2-3 vertical fan mode 3-4 Sonar menu 2-15 Speed warning 7-7 Sub panel description 1-2 System configuration vi System menu 6-4 System setting menu 6-1 Test pattern 7-6 Tilt angle 2-4...