Furuno CH-37 Radar Detector User Manual

COLOR SECTOR SCANNING SONAR

MODEL

CH-37

Telephone : 0798-65-2111

(( TENI

CH-37

*00080821101*

*00080821101*

*OME13030E00*

*OME13030E00*

SAFETY INSTRUCTIONS

WARNING

ELECTRICAL SHOCK HAZARD

Do not open the equipment.

Only qualified personnel should work inside the equipment.

Immediately turn off the power at the switchboard if water leaks into the equipment or something is dropped in the equipment.

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.

Do not place liquid-filled containers on the top of the equipment.

Fire or electrical shock can result if a liquid spills into the equipment.

Immediately turn off the power at the switchboard if the equipment is emitting smoke or fire.

Continued use of the equipment can cause fire or electrical shock. Contact a FURUNO agent for service.

Make sure no rain or water splash leaks into the equipment.

Fire or electrical shock can result if water leaks in the equipment.

WARNING

Keep heater away from equipment.

A heater can melt the equipment’s power cord, which can cause fire or electrical shock.

Use the proper fuse.

Fuse rating is shown on the equipment.

Use of a wrong fuse can result in equipment damage.

Do not operate the equipment with wet hands.

Electrical shock can result.

iiiiiiiiiiiii

i

Name: Warning Label (1)

Type: 86-003-1011-0

Code No.: 100-236-230

CAUTION

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.

Do not ingest the oil. Diarrhea or vomiting

• can result.

Keep the oil out of reach of children.

Emergency

•

If the oil enters eyes, flush with clean water about 15 minutes. Consult a physician.

•

If the oil contacts skin, wash with soap and water.

•

If the oil is ingested, see a physician immediately.

Disposal of oil and its container

Dispose of oil and its container in accordance with local regulations. For further details, contact place of purchase.

Storage

Seal container to keep out foreign material. Store in dark place.

ii

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 ....................................................................................................... 1-4

1.6 Background Color ........................................................................................................ 1-6

1.7 Degaussing the Screen ................................................................................................ 1-6

SONAR MODE

2.1 Typical Operating Procedure ........................................................................................ 2-1

2.2 Selecting Range ........................................................................................................... 2-2

2.3 Selecting Sector, Sector Stepping ............................................................................... 2-3

2.4 Setting the Tilt Angle .................................................................................................... 2-4

2.5 Adjusting Gain .............................................................................................................. 2-7

2.6 Rejecting Sonar Interference and Noise ...................................................................... 2-7

2.7 Detecting Fish Schools Aurally .................................................................................... 2-9

2.8 R/B and Event Markers (trackball operation) ............................................................. 2-10

2.9 Selecting Training Sector Quickly ............................................................................... 2-11

2.10 Suppressing Bottom and Sea Surface Reflections in Shallow Fishing Grounds ...... 2-11

2.11 Suppressing Bottom Tail ........................................................................................... 2-12

2.12 Displaying Surface Fish Clearly (TVG adjustment) .................................................. 2-12

2.13 Relocating Fish School for Easy Observation .......................................................... 2-14

2.14 Finding Fish School Center ...................................................................................... 2-14

2.15 Sonar Menu Operation ............................................................................................. 2-15

2.16 E/S Menu ................................................................................................................. 2-16

2.17 Turning Trackline Plotting On/Off ............................................................................. 2-17

2.18 Interpreting the Display ............................................................................................ 2-18

2.19 Sonar Mode Indications ........................................................................................... 2-24

2.20 Application Example ................................................................................................. 2-26

VERTICAL FAN MODE

3.1 Typical Operating Procedure ........................................................................................ 3-1

3.2 Selecting Range ........................................................................................................... 3-2

3.3 Selecting Bearing for the Vertical Fan .......................................................................... 3-3

3.4 Selecting the Display Sector ........................................................................................ 3-4

3.5 Automatic Shifting of Own Ship Position ...................................................................... 3-5

3.6 Rejecting Sonar Interference and Noise ...................................................................... 3-5

3.7 Horizontal, Vertical and Event Markers (trackball operation) ....................................... 3-6

3.8 Applying Proper TVG ................................................................................................... 3-7

iii

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 .................................................. 4-3

4.4 Other Operations.......................................................................................................... 4-3

CUSTOM MODE KEYS ( 1 , 2 , 3 )

5.1 About the Custom Mode Keys ..................................................................................... 5-1

5.2 Customizing the Keys .................................................................................................. 5-1

5.3 Custom Mode Operation .............................................................................................. 5-2

MENU SETTINGS

6.1 System Setting Menu ................................................................................................... 6-1

6.2 Screen Adjustment ....................................................................................................... 6-2

6.3 System Menu ............................................................................................................... 6-4

6.4 Dual Menu .................................................................................................................... 6-9

MAINTENANCE & TROUBLESHOOTING

7.1 Maintenance of Display Unit ........................................................................................ 7-1

7.2 Maintenance of Transceiver Unit ................................................................................. 7-1

7.3 Maintenance of Hull Unit .............................................................................................. 7-2

7.4 Display Unit Test .......................................................................................................... 7-3

7.5 Train/Tilt Test ................................................................................................................ 7-5

7.6 Test Pattern .................................................................................................................. 7-6

7.7 Error Messages ............................................................................................................ 7-6

7.8 Troubleshooting Table .................................................................................................. 7-9

CUSTOM MODE KEY LABELS

.......................................................................AP-1

SPECIFICATIONS

..................................................................................................SP-1

INDEX

.......................................................................................................................Index-1

iv

Features

FOREWORD

Congratulations on your choice of the FURUNO CH-37 Color

Sector Scanning Sonar! We are confident that you will enjoy many years of trouble-free operation with this fine piece of equipment.

For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for quality and reliability throughout the world. This dedication to excellence is furthered by our extensive 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. The sonar picture is presented in 16 or 8 colors on a high resolution CRT. The excellent signal processing technique and improved receiver bring you a clear and high-quality picture on a 15-inch screen.

We would appreciate feedback from you, the end-user, about whether we are achieving our purpose.

Thank you for considering and purchasing FURUNO equipment.

• Multi sector scanning provides quick coverage of full 360

° area in just 8 transmissions.

• PPI operation can be selected for superior detection range and bottom fish sounding.

• Custom mode keys provide desired sonar settings by one key stroke.

• Selectable background color lessens eye fatigue in both daytime and nighttime operations.

• Selection of frequencies - 60, 81, 113, 162 kHz.

• Trackball offers easy-to-use operation for marker settings.

• Quick training and quick raise/lower operation.

• Vertical mode presents a vertical section of underwater conditions.

• 3D mode shows vertical echoes like a graphic track plotter.

v

SYSTEM CONFIGURATION

OPTIONAL SUPPLY STANDARD SUPPLY

LOUDSPEAKER

SC-05WR

DISPLAY UNIT

CH-370

REMOTE CONTROL BOX

CH-343

External

Interface

OP06-13

(Built-in)

02S8040 6M

EXTERNAL

MONITOR

MOTION

SENSOR

MS-100 or

Clinormeter

BS-704

External

Interface

OP06-14

(Built-in)

24-32V DC

250V-DPYCYS-2

250V-DPYCYS-2

250V-DPYCYS-2

: Connector to fitted at installation

: Connector fitted at factory

: Crimp-on lug to be fitted at installation

NOTE 1: Two sets of rectifiers are necessary for AC mains.

NOTE 2: DC ship's mains only. For AC ship's mains, the power

is supplied directly from the rectifier unit to the trans-

ceiver unit.

vi

MENU TREE

SONAR

[MENU] key

BOTTOM/3D

DUAL

E/S

TX RATE

TX PULSE LENGTH

TX OUTPUT POWER

TX EXT SYNC

IR

STABILIZER

COLOR

RES. COLOR

TVG (LEVEL)

TVG (TIME)

BEAM WIDTH

AUTO TRAIN SECTOR

VERT. ECHO OVERLAY

3D VIEW SCALE

TIME SCALE

DUAL MODE

NET MOUTH SHIFT

NET MOUTH WIDTH

NET MOUTH HEIGHT

NET DEPTH

HOR SCAN RATE

VERSCAN RATE

RANGE

SHIFT

GAIN

N.L.

IR

ADVANCE SPEED

RES. COLOR

[PWR] key + [MENU] key

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

DEFAULT

vii

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-MODEL MANUAL TRAIN

DEGAUSSING INTERVAL

FACTORY SETTING

This page is intentionally left blank.

OPERATIONAL OVERVIEW

1.1 Control Description

Main panel

PWR

O

MODE

TRAIN

TRANSDUCER

-

+

RANGE

4 6

2

0

GAIN

10

8

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):

Normal Sonar Mode or Normal Sonar Mode + E/S Combination*

Expanded Sonar Mode

Vertical Fan Mode or Vertical Fan Mode + E/S Combination*

3D Display* (front perspective view)

3D Display* (slant perspective view) *: Optional supply

Selects the detecting (display) range. Turn clockwise to increase the detection range. The selected range appears in large characters for a few seconds and remains at the upper right corner of the screen.

SECTOR TILT

FULL

HALF

EVENT

R/B

Determines the center bearing of the train sector. The selected bearing appears by a large white mark on the bearing scale. In the expanded sonar mode, it controls the direction to be off-centered (four directions). In the vertical fan mode, it determines the bearing of the vertical fan training.

Adjusts the sensitivity of the receiver. Turning the control clockwise increases the sensitivity. When changing the range and tilt settings, readjust the sensitivity. For normal use, set it between 3 and 5.

1 2 3

CUSTOM MODE ENTER

CH-37

In the sonar mode, it controls the tilt angle, between +5

°

and -90

°

. The setting angle is set in 1-degree steps and appears at the upper right corner of the screen. In the vertical fan mode, it determines the sector center of vertical scanning.

In the sonar mode, it selects the width of the transducer training sector among six positions (45

°

, 90

°

, 135

°

, 180

°

, 225

°

, and 360

°

). The direction of training can be made in both directions except at the 360

°

setting. In the vertical fan mode, the sector widths are 36

°

, 60

°

, 96

°

, 120

°

,

156

°,

and 180

°

. FULL/HALF key switches the training sector or sector width between full circle and half circle by single key stroke.

The trackball moves the trackball marker (+). The trackball mark data, that is, slant range, horizontal range, depth and bearing to the trackball marker, are always indicated on the screen. Additionally, this control positions the R/B (Range/Bearing) marker and sets the event marker, with the R/B and the EVENT keys. The EVENT key displays the event marker.

Provides user-defined sonar settings with a single key. The ENTER

key opens the custom mode key setting menu.

Figure 1-1 Main panel

1-1

Sub panel

Sub-panel 1

0 10

LEVEL

0 10

TIME

0

NL

10 0 10

AUDIO

TVG

0 10

DIMMER

0 10

BRILL

HUE E/S DEGAUSS

FAST

SCAN

TRACK

V:H

RANGE

AUTO

TRAIN

BOTTOM MODE

MENU

MENU

Sub-panel 2

Function

TVG

NL

AUDIO

DIMMER

BRILL

Description

LEVEL controls the receiver sensitivity to eliminate surface noise, which may mask shallow targets. TIME determines the TVG effective range.

Rejects noise which appears on the screen in light blue or blue. A setting between 2 and 4 will suffice in most cases.

Adjusts the volume of the external loudspeaker, which monitors target echoes.

Adjusts panel backlighting.

Adjusts screen brilliance.

Function Description

HUE

E/S

Changes the background color of the display in the sequence of deep blue, blue, black.

Turns the E/S combination display on/off. (Optional devices required.)

DEGAUSS The screen is automatically degaussed at the interval selected on the system setting menu. To manually degauss the screen press this key.

FAST SCAN Changes the sector steps (45

°

/6

°

in sonar mode and 6

°

/3

°

in vertical fan mode).

TRACK Turns the course line plotting on/off.

(Navigation equipment required.)

V:H RANGE Changes the horizontal range scale in the vertical fan mode.

AUTO TRAIN Changes the auto and manual train in the vertical fan mode.

MENU Displays the menu screen of the mode in use.

Figure 1-2 Sub panel 1 and sub panel 2

1-2

1.2 Turning the Power On/Off

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. The lamp above the switch lights while the transducer is being raised and goes off when the transducer is fully raised. Then, press the PWR switch.

Note: The transducer is automatically retracted into the tank

even if the PWR switch is pressed before retracting the transducer. However, for safety purposes, make it a habit to retract the transducer before turning off the power.

1.3 Adjusting Screen Brilliance, Panel Backlighting

The BRILL control adjusts screen brilliance and the DIMMER controls adjusts panel backlighting. These controls are on the sub panel 1.

1.4 Lowering the Transducer

Press the h

switch on the main panel to lower the transducer.

The lamp above the switch blinks while the transducer is being lowered and lights when the transducer is fully lowered.

CAUTION

Observe maximum allowable ship’s speed of 18 knots during operation and 15 knots while raising/lowering transducer, to prevent damage to the transducer.

1-3

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 Presentation

Normal sonar mode

Normal full circle picture appears on the entire screen.

Normal sonar + E/S, vertical fan or sonar

Normal full circle picture appears at the upper 2/3 of the screen; the echo sounder, vertical fan or sonar on the lower 1/3. To select the picture to display in the lower 1/3, see DUAL

MODE on page 6-9.

(Echo sounder required to display echo sounder picture).

Expanded sonar mode

Zoomed picture appears on the entire screen. The echo size on the screen is expanded 1.5 times.

(Continued on next page)

1-4

Mode 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 on the upper 2/3 and echo sounder or sonar picture on the lower

1/3. To select the picture to display in the lower 1/3, see DUAL MODE or page 6-9.

(Echo sounder required to display echo sounder picture).

3D display (front perspective view)

The vertical contour line appears historically (time or distance). Only the latest echo is painted, like the vertical mode presentation.

This mode may be turned on in the SYSTEM menu.

3D display (slant perspective view)

Display contents are same as front perspective mode except the perspective is different. This mode may be turned on in the SYSTEM menu.

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.

1-5

1.6 Background Color

The background color is available in deep blue, blue or black, with the HUE key.

1.7 Degaussing the Screen

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.

1-6

SONAR MODE

2.1 Typical Operating Procedure

1

2

PWR

O

TRANSDUCER

-

+

4

MODE

TRAIN

RANGE

4 6

2

0

GAIN

10

8

8

1

Turn on the display unit.

2

Lower the transducer.

3 Adjust the brilliance of the CRT.

4

Set the MODE knob to or position.

SECTOR TILT

FULL

HALF

EVENT R/B

10

5

Select the range desired with the RANGE control.

6 Select the automatic training area and center position with the SEC-

TOR and TRAIN controls. The FULL/HALF key provides a quick change of the area (225

°

360

°

).

7

Adjust the tilt angle with the TILT control. See page 2-3 through 2-5 for details.

8

Adjust the GAIN and TVG controls.

[Gain: 3-5, TVG (level & time): 3-5]

0 10

8

0

1 2 3

LEVEL

0 10

TIME

0

NL

10 0

AUDIO

10

TVG

CUSTOM MODE

0 10

ENTER

DIMMER BRILL

CH-37

3

HUE

E/S DEGAUSS

12

FAST

SCAN

TRACK

V:H

AUTO

RANGE

TRAIN

BOTTOM MODE

MENU

MENU

9

Adjust the NL control if a large number of small blue dots appear on the screen. Normally set it between 2 and 4.

10

With the trackball marker, measure the distance to a fish school or the bottom.

11

Reduce the output power if necessary. Normally, set it for maximum position (C).

12

Turn off "FAST SCAN" mode if longer detection is required.

Figure 2-1 Main panel and sub panel controls

2-1

2.2 Selecting Range

The RANGE control selects the detection (display) range. Select 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).

SEA SURFACE

Range indicated on the screen.

BOTTOM

Figure 2-2 Range selection

Table 2-1 Transducer frequency and range

Freq.

- RANGE (m*) +

60 kHz 50 100 150 600 800 1200 1600

81 kHz 60 100 150 500 1000 800 1200

Range (m)

113 kHz 50 100 150 500 600 800 1000

162 kHz

50 100 150 450 500 600 800

Note: Unit of range measurement may be changed through

the SYSTEM menu. For details see page 6-1.

2-2

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 positions. In the full circle mode (360

°

) the direction of training is clockwise only.

Table 2-2 Transducer training sector

Mode

Sonar mode

Transducer Training Sector (display area)

45

°

, 90

°

, 135

°

, 180

°

, 225

°

* and 360

°

*

* Selected by FULL/HALF key.

Sector center marker

Training sector

90

°

Figure 2-3 Sector selection

Sector step

The FAST SCAN key in the sub panel 2 selects sector step in

45

°

or 6

°

.

2-3

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. The tilt angle can be set in one-degree steps from -5

°

(upward) to 60

°

(downward).

Finding a proper tilt angle is important when searching for fish.

Bottom echo and tilt angle

Case 1: Tilt angle 30

°

to 40

°

This tilt angle will display the entire bottom since it is captured by the full width of the beam.


°

to 20

°

This tilt angle will only display half the bottom since it is only captured by the lower half of the beam.


°

to 5

°

This tilt angle may or may not capture the bottom since the returning echo is weak.

How to discriminate fish echoes from the bottom

The figure at the top of the next page illustrates how two fish schools a

and b

are displayed on the screen using three different tilt angles.


°

to 40

°

. Fish school is obscured by the bottom.


°

to 20

°

. Fish school is located above the bottom (midwater).


°

to 5

°

. Fish school is located close to the bottom.

2-4

Case 1

Case 2

Case 3

Fish School a

Fish school a

Fish school a

Bottom

Bottom

Fish school b

Fish school b

Case 1

Case 2

Figure 2-4 Fish echo and tilt angle

Fish school b

Case 3

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.

• In case 3, both fish schools a

and b

are presented. Generally speaking, however, midwater fish schools tend to be larger than bottom fish schools and they are often displayed near the bottom on the display.

• It is difficult to detect bottom fish when they are not distributed vertically.

Tilt angle for surface fish

Sound emitted from the sonar transducer forms an oval-shaped beam with a width of approximately 13

°

(for 60 kHz transducer) in the vertical direction (vertical beam width). The tilt angle is indicated by the angle between the center line of the beam and the horizontal plane. Then, if the tilt angle is set to 0

°

, the center line is parallel with the sea surface and one half of the emitted sound goes upward, toward the sea surface.

This causes one half of the emitted sound to be reflected toward the transducer and displayed on the screen as sea surface reflections. When the sea is calm, since the sound is reflected just like a light hitting a mirror at a narrow incident angle, it propagates away and the sea surface reflections become negligible.

2-5

2-6

However if the sea is not calm enough, they will become dominant and interfere with observation of wanted echoes. To minimize 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 with the sea surface. When the sea is rough, it is often set to a little larger angle.

Sea surface

Tilt angle 0

°

11

°

Sea surface

Tilt angle 5-7

°

11

°

Figure 2-5 Tilt angle and sea surface reflections

R400

T 15

Tilt angle

Suitable tilt angle

The figure below illustrates the relationship among tilt angle, depth and detection range. Refer to it to find out the suitable tilt angle for a given depth/detection range.

Tilt angle and beam coverage (frequency, 60 kHz, vertical beamwidth, 13

°

100

(200)

200

(400)

300

(600)

20(40)

40(80)

60(120)

80(160)

100(200)

Range (m)

400

(800)

0

°

5

°

10

°

15

°

200(400)

Vertical width of sonar beam

13

°

23 m

200 m

46 m

300 m

68 m

Figure 2-6 Tilt angle and beam coverage

2.5 Adjusting Gain

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. Initially set the gain between 3 and 5 with the GAIN control. Then, fine tune depending on the fishing ground, frequency used, etc.

Few fish found or difficult to find fish habitat.

Feeble echoes

Random noise

Surface noise

Interference

Turn GAIN control clockwise.

2

0

4 6

8

10

Adjust NL control.

2

0

4 6

8

10

Adjust TVG controls.

2

0

4 6

8

10

CLEAR

PICTURE!

Turn on "IR" in SONAR menu.

Figure 2-7 How to set the gain

2.6 Rejecting Sonar Interference and Noise

While observing the sonar picture, you may encounter occasional or intermittent noise and interference as shown below.

These are mostly caused by onboard electronic equipment, engine, propeller noise, or electrical noise from other sonars being operated nearby.

(A) Inteference from (B) Interference from

other sonars marine life

Figure 2-8 Noise and interference

2-7

2-8

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.

If neither of the above affects the picture, turn on “IR” in the

SONAR menu or adjust the NL (Noise Limiter) control as below.

Rejecting noise with the interference rejector

This control is effective in rejecting random noise and sea surface reflections in rough sea conditions. Pull the GAIN control and adjust it to eliminate only noise. Reject the noise with “IR” in the SONAR menu. Do not use an unnecessarily high setting since it many also reject small wanted echoes.

Rejecting noise with NL control

Weak, unwanted reflections, colored light blue or green, appear when water is contaminated, or plankton layers or noise exist. These echoes gradually become bluish as the NL control is turned clockwise. Usually a setting from 3 to 4 provides sufficient reduction.

Rejecting interference with Tx rate

When other sonars are operating nearby at the same transmission interval as that of own ship’s sonar, interference caused by other sonars appears. To reduce the interference, reduce the Tx rate setting on the SONAR menu.

Note: When the sonar is used in shallow water with the range

set between 100 m and 200 m and the Tx rate at 10, bottom reflections caused by the transmission which is the last but one appear on near on screen. Reduce the

Tx rate to 7 or 8 to reject them.

2.7 Detecting Fish Schools Aurally

Occasionally you will be preoccupied with other tasks and unable to concentrate on watching the sonar picture. In such cases it would be a good choice to use the audio function. This function enables you to monitor echoes from fish schools and bottom through the external speaker (option), of which the volume can be adjusted with the AUDIO control on the sub panel 1.

After you become accustomed to utilizing the audio function, you should be able to detect a fish school from a range longer than you can detect it on the screen. In addition you may judge whether the fish schools is approaching or going away; the tone becomes higher when the fish is approaching and lower when going away.

2-9

2.8 R/B and Event Markers (trackball operation)

The trackball functions to obtain the data (slant & horizontal range, depth and bearing) from own ship to the specified position on the screen and, combined with the R/B and EVENT keys, it switches the R/B and event markers on/off. With navigation data input, the event marker moves with ship’s movement.

Function

Trackball

Data

Procedures/Purpose

1) Position the trackball marker on the location desired.

Trackball data

Trackball marker

Event marker

2) Read the trackball data displayed at the upper left corner

of the screen.

1) Position the trackball marker on the location desired.

Event marker

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.

R/B marker

R/B marker data

2) Press the R/B key. The range and bearing markers

appear and their data appears at the bottom left-hand

side of the screen.

3) To erase the marker, place the marker near the own

ship position or outside the echo display area and

press the R/B key.

2-10

2.9 Selecting Training Sector Quickly

Normally the training sector is selected by the SECTOR control. To the training sector more quickly, however, use the FULL/

HALF key. This key allows switching between full circle and half circle training sector in a single key stroke.

FULL CIRCLE HALF CIRCLE

FULL/HALF key

SECTOR

Figure 2-9 How the SECTOR control and FULL/HALF key work

2.10 Suppressing Bottom and Sea Surface Reflections

in Shallow Fishing Grounds

In shallow fishing grounds, excessive sea surface and bottom reflections often interfere with wanted fish echoes and they cannot be eliminated sufficiently with the aforementioned TVG controls. In such cases, try to reduce the output power from C to B or A on the SONAR menu, without turning down the gain. The picture becomes clearer when output power is reduced rather than when the gain is decreased, as illustrated below.

2-11

0 10

DIMMER

0 10

BRILL

HUE

E/S DEGAUSS

FAST

SCAN

TRACK V:H

RANGE

AUTO

TRAIN

BOTTOM MODE

MENU

MENU

MENU

TX RATE

: SONAR BOTTOM/3D E/S

: 10

TX PULSE LENGTH : LONG SHORT

TX OUTPUT POWER : A B

C(MAX)

Figure 2-10 How to reduce bottom and surface reflections by reducing Tx output power

2.11 Suppressing Bottom Tail

As described earlier, fish schools near the bottom are sometimes difficult to detect because you have to discriminate fish echoes from the bottom reflections. To discriminate fish echoes near the bottom, select the short Tx pulse length on the SONAR menu to decrease the tail of bottom reflection.

2.12 Displaying Surface Fish Clearly (TVG adjustment)

Echoes from targets (such as the bottom or a fish) return to the transducer in order of the distance to them, and when their intensities are compared at the transducer face, those from nearer targets are generally stronger when their reflecting properties are nearly equal. The sonar operator will be quite inconvenienced if these echoes are directly displayed on the screen, since he won’t be able to judge the actual size of the target from the size of echoes displayed on the screen. To overcome this inconvenience, use the TVG function. It compensates for propagation loss of sound in water: amplification of echoes on short range is suppressed and gradually increased as range increases so that similar targets are displayed in similar intensities irrespective of the ranges to them.

2-12

In the CH-37, the TVG LEVEL and TIME controls compensate for propagation loss. The effective distance is up to 1000 m approximately.

Noise caused by strong reflection of surface turbulence.

Without TVG function

Nearer target echoes appear in larger size.

Reduce gain for

Proper TVG setting

nearby areas, using

TVG.

Echoes of equal size targets are presented in the same color and size.

Noise is rejected.

Position

0 10

LEVEL

0 10

TIME

TVG

3

5

0

2

10

Figure 2-11 How to adjust TVG

TVG Range

0 m

60 m

130 m

300 m

1000 m

The TVG also functions to suppress unwanted echoes and noise which appear in a certain range area on the screen as shown in the figure above.

To adjust the TVG;

1. Set TVG time between 3 and 5 (approx. 130-300 m). This is the standard setting and you can maintain it in most cases.

2. When sea surface reflections or plankton layers disturb the picture, set the TVG level control around 5 to eliminate them.

3. Locate a fish school on a long range setting which is approaching your vessel. Adjust the tilt to keep the fish school in the center of the sonar beam. Check that the fish echo appears in the same color while it approaches. If the color changes suddenly to weaker colors as the fish echo nears, the TVG is improperly set. Adjust the TVG level to correct it.

If sea surface reflections and noise remain, try to remove them with the interference rejector (“IR” on the SONAR menu) and NL control as described on page 2-8.

2-13

2.13 Relocating Fish School for Easy Observation

When a fish school is near the edge of the screen and inconvenient 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.

Fish school

Fish school

Own ship

Figure 2-12 How to relocate fish school

2.14 Finding Fish School Center

When you want to find the center depth of a fish school, change the tilt angle and observe the presentation as follows:

1. Select a narrow sector range (45

°

) and capture the target echoes.

2. Adjust the tilt angle with the TILT control slowly and observe the change of the presentation color.

3. The echo presented in the strongest color is the center of the fish school.

Tilt setting

R 800

T 8

°

Figure 2-13 How to find fish school center

RANGE

TILT

2-14

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 panel 2.

MENU

TX RATE

: SONAR BOTTOM/3D DUAL E/S

: 10

TX PULSE LENGTH : LONG SHORT

TX OUTPUT POWER : A B C(MAX)

TX EXT SYNC

IR

STABILIZER

COLOR

RES. COLOR

EXIT

: OFF

: OFF

: OFF

: 16

: LOG

ON

ON

ON

8

LINEAR SQUARE

: PRESS MENU KEY

Figure 2-14 Sonar menu

3. Select item and setting with the arrow keys. The selected item is highlighted and the current setting is circumscribed in white.

4. To turn off the menu, press the MENU key again.

Sonar menu description

TX RATE: Selects transmission repetition rate in ten steps. “1”

is the longest interval; “10” the shortest. Set to “10” for normal use.

TX PULSE LENGTH: Selects Tx pulselength to “LONG” or

“SHORT.” The pulselength is adjusted automatically according to the range setting in “LONG” or “SHORT” position. Set to

“LONG” for normal use.

TX OUTPUT POWER: Adjusts output power; “A” is for mini-

mum power and “C,” maximum. Set to “C” for normal use, and use a low power when sea surface reflections or bottom echo obscures fish schools.

2-15

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.

STABILIZER: Select “ON” when the Motion Sensor MS-100

(option) is connected.

COLOR: Selects 16- or 8-color presentation.

RES COLOR: Sets echo presentation characteristics. LOG

enhances weak echoes and is normally used. LINEAR downplays the weak echoes comparing with LOG. It is effective for suppressing the plankton layer. SQUARE enhances the strong echoes comparing with LINEAR, resulting in clear and easy-reading picture.

2.16 E/S Menu

1. Press the MENU key.

2. Select E/S at the top of the screen.

MENU: SONAR BOTTOM/3D DUAL E/S

RANGE

:

40 80 160

:

240 320

SHIFT

:

0

GAIN

:

5.0

N.L

:

0

IR

:

OFF ON

ADVANCE SPEED

:

1/1 1/2 1/4

RES. COLOR

:

LOG LINEAR

EXIT : PRESS MENU KEY

Default settings circumscribed.

Figure 2-15 E/S menu

2-16

R A N G E

S H I F T

G A I N

N .

L .

I R

I t e m

A D V A N C E S P E E D

R E S .

C O L O R

Table 2-1 E/S menu description

D e s c r i p t i o n

S e l e c t s e c h o s o u n d e r r a n g e : 4 0 , 8 0 , 1 6 0 , 2 4 0 o r 3 2 0 ( m e t e r s ) .

E n t e r d i s p l a y s t a r t t i n g d e p t h .

A d j u s t s g a i n .

S u p p r e s s e s n o i s e w h i c h c o v e r s t h e w h o l e s c r e e n .

N o r m a ll y , s e t t o 1 o r 2 .

S u p p r e s m a c h i n e s e r y s o i n t e n b o r a f e r d r n c e o w n f r o m s h i p .

s o n a r o f o t h e r s h i p o r n o i s e f r o m e l e c t r i c a l

S e p r o l e c t d u c s e p i c t u r e d p e r t a r a d v a n s m n c e s p i s s i o n .

e e d .

T h e f r a c t i o n s t h e n u m b e r o f s c a n il n e s

S e l e c t " L O G " o r " L I N E A R " a c

L I

L

N

O

E A

G :

R

F

:

C

F C V

V 2 9

3

1 ,

8 2

2 9

,

2

7

.

8 2 , 2 7 1

1 0 0 0 c o r d i n g t o a m p il f i e r o f e c h o s o u n d e r .

2.17 Turning Trackline Plotting On/Off

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.

2-17

2.18 Interpreting the Display

This section provides the information necessary for interpreting 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). The information (target echoes) obtained by this beam is displayed in 45

°

sector of the screen. Thus, all directions around the boat are s ounded in 8 times of transmissions.

Note: When the “FAST SCAN” is switched off, the equipment

operates in a narrow sounding beam. Then, the echoes appear on a 6

°

sector in each transmission, so 60 times of transmissions are required to complete full 360

°

picture (6

°

x 60 = 360

°

). This means that sounding speed reduces. However, since transmission power is concentrated into the narrow sounding beam, a superior detection range is obtained. Furthermore, since the bottom contour is painted distinctly, bottom fish detection may become easier.

Sounding Beam Screen Display

Freq: 60 kHz

TX

Tilt

θ

Sounding

Beam

RX

60

°

/16

°

16

°

13

°

13

°

45

°

*

Tilt:

θ

2-18

When the narrow sounding beam (6-degree step operation) is selected, 60 transmissions are required to complete the full circle detection.

Figure 2-16 How the picture is painted

Bottom echoes

When the tilt angle is widened, the bottom echo illustrated below 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) Flat bottom

Tilt angle: 10

°

to 15

°

Narrow tilt angle

Only half of vertical beam width captures the bottom.

(B) Flat bottom

Tilt angle: 20

°

or more

(C) Sloping bottom

Tilt angle: 20

°

or more

Bottom is displayed narrower and in stronger colors when compared to (A).

Shallow bottom is displayed in a strong color and with a short tail.

Bottom

The deeper bottom echo is displayed in a weak color and with a long tail.

Figure 2-17 Bottom echoes

2-19

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: -5

°

to 10

°

Fish school

Sea surface reflections

(B) Midwater, bottom fish Tilt angle: 30

°

or more

Fish echo which appears before bottom can be detected.

Bottom

Bottom echo not displayed because of narrow tilt angle.

Sea surface reflections are present.

Fish school

Large midwater fish school is present.

Tilt angle: -0

° to 20

°

Fish echo which appears together with or after bottom can be detected.

Fish school

Bottom

Figure 2-18 Fish schools

When the tilt angle is shallow, he reflection echo from bottom is weak and the fish echo which appears from bottom is easy to find.

2-20

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.

Other ship

Sea surface

Tilt angle indication

15

°

Sea surface reflections

Sea surface

15

°

Figure 2-19 Sea surface reflections

Wake

A wake produced by own ship or another ship can be a strong reflecting object when a narrow 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.

Own ship

Own ship’s screw noise

Wake produced by other ship

Own ship’s screw noise

Figure 2-20 Wake appearance on the display

Own ship’s wake

(produced when own ship turned)

2-21

2-22

Sidelobe

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. These are represented on the display as a false echo as shown below.

Mainlobe echo

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.

Figure 2-21 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 operated 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 SONAR 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 ”IR” in the SONAR menu.

(A) Inteference from (B) Interference from

other sonars marine life

Figure 2-22 Noise and interference

2-23

2.19 Sonar Mode Indications

Normal sonar display

Trackball marker data

320

°

Heading*


Range

Tilt

North marker*

Range marker

Fish school

2

3

1

Bearing scale

Current (tide) vector

Own ship marker

Trackball marker

Bottom echo

Bearing marker

Range and bearing marker data

→

↓

39

40

9

B 228

°

34

°

D35.0

43.261N

135

°

20.282E

C1: 0.9

C2: 0.8

C3: 0.5

Depth, latitude, longitude

(Requires navigator)

*: Heading, north marker require current indicator

and gyro or log.

Courseline

(Requires navigator or current indicator)

Current data

(Requires current indicator)

Figure 2-23 Indications on the normal sonar display

2-24

Trackball marker data

Expanded sonar display


R 150

T 10

°

Range

Tilt

Sector width marker

Own ship marker

Trackball marker

Figure 2-24 Indications on the expanded sonar display

2-25

2.20 Application Example

The figure below shows a typical sonar mode application.

Sonar (Horizontal) Mode

PURSE SEINING

1

Power ON.

PWR

O

TRANSDUCER

-

+

MODE RANGE

2

Lower soundome.

PWR

O

TRANSDUCER

-

+

3

Search for fish school

with RANGE and TILT

controls.

PWR

O I

TRANSDUCER

-

+

MODE

TRAIN

RANGE

4 6

2

0

GAIN

10

8

Go to 4 on next page.

After blinking, remains lit.

BOTTOM TRAWLING

GAIN : "3~5"

NOISE LIMITER : "2~4"

TVG(level & time) : "3~5"

TX POWER : C

Use these settings initially.

"Fine tune" as necessary.

1

Power ON.

2

Lower soundome.

3

Observe bottom on the screen.

PWR

O

TRANSDUCER

-

+

PWR

O

TRANSDUCER

-

+

Bottom

MODE RANGE

After blinking, remains lit.

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. If the fish school is dense enough and off the bottom they can be detected by sonar.

Select the proper range and tilt angle.

Go to 4 on next page.

2-26

Here comes fish school !

Scout-boat

5

Change tilt angle for strongest fish school echo.

Fish school

Bottom

6

Monitor situation of both fish school and net.

Fish school

Net

4

Narrow the train area, and track fish school.

Fish school

Trackball marker

Data for fish school pointed by trackball marker (+).

TRAIN

4

2

0

GAIN

6

8

Net-boat

5

Observe movement of fish school and scout-boat.

Fish school

Scoutboat

6

Set net around fish school.

SECTOR TILT

FULL

HALF

EVENT R/B

Adjust tilt angle and observe both screens.

FULL

HALF

EVENT R/B

4

Narrow the train area, and track fish school.

Bottom

Fish school

Outcrop

Trackball marker

Marker can be moved to any position by rotating trackball.

SECTOR

FULL

HALF

EVENT

5

Expand historical display and observe bottom.

Bottom

Fish school

Outcrop

Observe the net and the fish school in it.

6

Data of fish school, bottom or outcrop pointed by trackball marker.

Here comes fish school !

Outcrop !!

DO NOT FORGET TO RETRACT THE SOUNDOME

BEFORE TURNING OFF THE POWER !!

Change tilt angle, and tow net.

2-27


VERTICAL FAN MODE

3.1 Typical Operating Procedure

PWR

O

TRANSDUCER

-

+

1

Turn on the display unit.

2

Lower the transducer.

3 Adjust the contrast and brilliance of the CRT.

4

Set the MODE control to position.

MODE

TRAIN

RANGE

4 6

2

0

GAIN

10

8

9

5

Select the range desired with the RANGE control.

6

Select the bearing of the vertical scanning with the TRAIN control.

7

Determine the center direction of the vertical scanning sector with the TILT control and select the sector width with the SECTOR control.

8

Select the auto train sector on BOTTOM/3D menu, if necessary.

SECTOR TILT

13

FULL

HALF

EVENT R/B

9

Adjust the GAIN and TVG on the BOTTOM/3D menu ([Gain: 3-5,

TVG (level & time): 3]).

0

1 2 3

LEVEL

0 10

TIME

0

NL

10 0

AUDIO

10

TVG

CUSTOM MODE ENTER

0 10 0 10

DIMMER BRILL

CH-37

3

11

10

Adjust the NL control if a large number of small blue dots appear on the screen. Normally set it between 2 and 4.

11

With the trackball marker, measure the horizontal or vertical distance to a fish school or the bottom.

12

Reduce the output power if necessary. Normally, set it for maximum position (C).

13

The FULL/HALF key provides a quick change of the sector (120

°

or

180

°

).

HUE

E/S DEGAUSS

FAST

SCAN

TRACK V:H

RANGE

AUTO

TRAIN

BOTTOM MODE

MENU

MENU

8 9

Figure 3-1 Main panel and sub panel controls

3-1

3.2 Selecting Range

The RANGE control selects the detection (display) range. Select 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).

Surface

RANGE m

Bottom

60 PORT

R 60

STBD 60

Horizontal range

Vertical range

60

(V:H=1:1)

- RANGE +

Range (m)

20 40 60 280 320 400

Note: The unit of range measurement can be changed through

the SYSTEM menu. For details see page 6-1.

Figure 3-2 How to select range

V:H RANGE key

The V:H RANGE key changes the horizontal range scale in two steps. See the figures below.

R

60

60

H

V

R

30

30

60

V:H=1:1 V:H=1:2

Figure 3-3 How the V:H RANGE key works

60

3-2

3.3 Selecting Bearing for the Vertical Fan

The TRAIN control determines the bearing of the vertical fan beam. To which bearing the beam positions is known by the train indicator mark.

Train Indicator Mark

Bow Bow

Training of Vertical Fan Beam

TRAIN

The training of the fan beam depends on the status of the AUTO

TRAIN key in the sub panel 2.

AUTO TRAIN

[on]

Train Indicator Mark

[Example]

Auto Train Sector: 90

°

(LED lights.)

Training of Vertical Fan Beam

Bow

[The beam trains automatically within the selected range centered at the bearing set by the TRAIN control.]

AUTO TRAIN

[off]

(Manual train)

Bow

Bow

(LED goes off.)

Manual train range can be selected either HALF

(174

°

) or FULL (360

°

) on the SYSTEM menu.

[The TRAIN control can rotate the fan beam to any bearing desired. See V-MODE

MANUAL TRAIN on page 6-2.]

3-3

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) respectively.

Mode Display Sector (transducer tilting sector)

Vertical Fan Mode 36

°

60

°

96

°

120

°

* 156

°

*/180

°

*

* Selected by FULL/HALF key.

PORT STBD

Display sector

(Shaded area)

180

°

0

°

Sector center

Sector center

Figure 3-4 Selecting the display sector

Sector step

The FAST SCAN key in the sub panel 2 selects sector step in

6

°

or 3

°

.

3-4

3.5 Automatic Shifting of Own Ship Position

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.

Display sector

Sector center

Figure 3-5 Automatic shift function

3.6 Rejecting Sonar Interference and Noise

While observing the picture, you may encounter occasional or intermittent noise and interference as shown below. This is mostly caused by onboard electronic equipment, engine, propeller noise, or electrical noise from other sonars being operated nearby. Turn on the interference rejector (IR) in the SONAR menu to reduce or eliminate the interference.

Figure 3-6 Interference and noise

3-5

3.7 Horizontal, Vertical and Event Markers

(trackball operation)

The trackball functions to obtain the data (horizontal range and depth) from own ship to the specified position on the screen and, combined with the R/B and EVENT keys, switches the

Horizontal, Vertical and Event markers on/off.

Event marker*

1) Position the trackball marker on the desired location.

Event marker*

Echo display area

Horizontal and Vertical markers

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.

Vertical marker

Horizontal marker

Distance to the intersection of the markers.


2) Press the R/B key. The horizontal and vertical markers appear and the distance to the intersection of the markers is indicated at the bottom left-hand side of the screen.

3) To erase the marker, place the marker outside the echo display area and press the R/B key.

* Requires navigation data.

(Continued on next page)

3-6

Function

Trackball

Data

Procedure/Purpose

Trackball data

Horizontal Range

Depth

Trackball marker


2) Read the trackball data displayed at the upper left corner of the screen.

3.8 Applying Proper TVG

The TVG function is the same as the one explained in the sonar 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.

MENU

TVG LEVEL

TVG TIME

BEAM WIDTH


: 3.0

: 3.0

: NAR

Figure 3-7 Bottom/3D menu screen

TVG level rejects surface noise, which may mask shallow targets and TVG time adjusts the effective depth.

Level too low Proper Level too high Time to high

Figure 3-8 Examples of proper and improper TVG

3-7

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 item is highlighted and the current setting is circumscribed in white.

4. To return to the BOTTOM/3D menu, press the menu key again.

MENU

TVG (LEVEL)

TVG (TIME)

BEAM WIDTH


: 3.0

: 3.0

: NAR WIDE

360 AUTO TRAIN SECTOR : 90

VERT. ECHO OVERLAY : OFF

3D VIEW SCALE

TIME SCALE

: TIME

: 1/1

180

ON

DIST

1/2 1/4

(or DISTANCE SCALE 500

EXIT

1000)

: PRESS MENU KEY

Figure 3-9 Bottom/3D menu

Bottom/3D menu description

TVG (Level): Controls the receiver sensitivity in short to me-

dium ranges to eliminate surface noise, which may mask shallow targets.

TVG (Time): Determines the TVG effective depth.

BEAM WIDTH: Sets the vertical beam width. Select narrow for

general use. The wide beam width is useful for searching a wide area vertically but fish detection range is shortened since the transmitted power attenuates.

AUTO TRAIN SECTOR: Sets the train sector; 90

°

, 180

°

, or

360

°

. Use a wide sector to conduct a general search, narrowing it once a fish school is detected.

VERT. ECHO OVERLAY: Turns the E/S combination display

on/off. (Requires external E/S.)

3-8

3D VIEW SCALE: Determines the depth item, time or distance

for 3D display mode. (Requires optional equipment.)

TIME SCALE or DISTANCE SCALE: Selects z-axis scale of

3D picture.

3.10 Interpreting the Display

This section provides the information necessary for interpreting the display.

Vertical

Fan

Mode

How the picture is painted

The sounding beam is emitted and the information (target echoes) obtained by the beam appears in the corresponding sector as it appears on the sonar mode. The difference is that the training is performed only in vertical direction. It forms a sounding area of a half-circle (like a slice of watermelon) to observe a vertical section of underwater conditions.

The bearing of the vertical sounding beam can be selected manually or automatically.

180

°

Bow

(3) Display area

Sounding Beam

(1) Bearing of the

Freq: 60 kHz

sounding beam

0

°

TX

16

°

13

°

Tilting direction

180

°

(2) Sector center

RX

16

°

13

°

Screen Display

(1) Bearing of the

sounding beam

0

°

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.

(2) Sector center

(3) Display area

Figure 3-10 How the vertical fan picture is painted

3-9

3-10

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 position increases. Therefore, it may be difficult to discriminate bottom fish.

Own ship

PORT STBD

Fish school

Bottom

Figure 3-11 Port-starboard picture

When ship passes over fish schools

The sounding beam is directed fore-aft and the display is offcentered* to present a wider view of the area forward of the ship. You can clearly see fish schools approaching from the bow of the ship.

*: Automatically shifted according to the operation control settings.

Forward

FORE

Own ship

AFT

Fish school

FORE

AFT

Fish school

Figure 3-12 Picture appearance when passing over fish schools

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

FORE

Net

AFT

Backward

Figure 3-13 Net hauling and sonar picture

False echo

In a shallow water (less than 100 m) detection, unwanted echoes shown in the figure may appear. This phenomenon is caused by the false echo from the previous transmission. Reducing the Tx rate on the BOTTOM/3D menu may lessen this effect.

False echo

Bottom

Fish

Range

Figure 3-14 False echoes

TIP! Training indicator and screen display.

Starboard-port

PORT STBD AFT

Fore-aft

FORE FORE

Aft-fore

AFT

¡ Shows starting position of the sounding beam.

3-11

3.11 Vertical Fan Mode Indications

Heading

Train indicator

Trackball data

Net mouth mark

Trackball

H-Range

V-Range

H-Range scale

Fish schools

Bottom

2nd reflection

V-Range scale

Vertical/Horizontal marker data

Figure 3-15 Indications in the vertical fan mode

3-12

3.12 How to Use the Vertical Fan Mode

[1] TRAWLER (Surface/Mid-water/Bottom)

Auto train

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. Observe the fish school near the bow of the ship, or inspect the bottom contour.

Fish schools

Shoal

2 After detecting a fish school, steer the boat toward that direction, turning off the "AUTO TRAIN" to observe that direction.

Bow

Steered angle

3 When approaching the fish school, change the beam direction to port-starboard by the TRAIN control and maneuver the boat so that the fish are led into the trawl net.

4 To observe the hauling of the net, turn the sounding beam to the fore-aft direction.

Net

Figure 3-16 Vertical fan mode usage in trawling

3-13

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.

Fish school

*Automatically shifted.

3 Shoot the net, and then observe the location of the fish and the status of the net.

Fish school

Net

Figure 3-17 Vertical fan mode usage on purse seiner

3D MODE

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. Vertical echoes can be turned on/off through the BOTTOM/3D menu.

4.1 Selecting a 3D Display

Either of two displays may be selected with the MODE control: the frontal image at “ ” position, or the oblique image at “ ”.

Example displays of both images are shown below.

Frontal image

The frontal image picture gives a view of the bottom as if you are looking at it through a rearview mirror. That is, the most recent data appears at the front if the picture.

Heading

Train indication

Trackball data

H-range

V-range

H-range scale

Vertical echoes

(real-time echoes)

Figure 4-1 Frontal image

4-1

Oblique image

The oblique image is the equivalent of the frontal image rotated by 45

°

counterclockwise.

Own position

Sectional view

Figure 4-2 Oblique image

4.2 Turning Vertical Echoes On/Off

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.

MENU : SONAR BOTTOM/3D DUAL E/S

VERT. ECHO OVERLAY : OFF

3D VIEW SCALE : TIM

TIME SCALE : 1/1

(or DISTANCE SCALE 500

EXIT

ON

DIST

1/2

1000)

: PRESS MENU KEY

1/4

Figure 4-3 Bottom/3D menu

4-2

4.3 Changing 3D View Scale Mode and Scale Selection

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. The fraction means graph update/number of transmission. “1/4,” for example, means the graph is updated every four transmissions.

These selections are made on the 3D VIEW SCALE and TIME

SCALE (or DISTANCE SCALE) lines of the BOTTOM/3D menu.

The time mode should be selected when speed data is not being fed to the unit from navaids or speed log.

Depth

Depth

Frontal image Oblique image

Figure 4-4 Depth dimension in frontal and oblique images

4.4 Other Operations

The following operations are the same as those in the Vertical

Fan mode.

• Range Selection

• Rejecting Sonar Interference and Noise

• Horizontal, Vertical and Event markers

• TVG Adjustment

• Beam Width Selection

The selection of the bearing of the vertical fan beam and auto train function are disabled, as the bearing of the vertical fan beam is automatically selected to 90

°

in this mode.

4-3


CUSTOM MODE KEYS (

¡

,

™

,

£

)

5.1 About the Custom Mode 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 sonar according to fishing ground or fish species being searched.

You can program three sets of settings for the MODE, RANGE,

SECTOR, TRAIN and TILT controls.

5.2 Customizing the Keys

1. Tune the sonar as you normally would.

2. Press the ENTER key to display the CUSTOM MODE menu.

3. Press one of

¡

,

™

or

£

key (contents shown in second column from the left in figure below).

[CUSTOM MODE menu]

ITEM SETTING CUSTOM1 CUSTOM2 CUSTOM3

MODE

RANGE

SECTOR

TRAIN

TILT

FAST

60

0

°

180

°

96

°

4. Repeat step (2) for remaining custom mode keys.

Note: Custom mode key labels are provided on page AP-1.

Cut them out and insert them in the label cases on the front panel. See the illustration on the next page for how to insert them.

5-1

5.3 Custom Mode Operation

1. Press desired custom mode key

¡

,

™

or

£

.

2. To escape from the custom mode settings, adjust any controls.

[Example]

FISHING GROUND

MODE

RANGE 200 m

SECTOR 360

°

TRAIN

TILT

0

°

30

°

MODE

RANGE 100 m

SECTOR 180

°

TRAIN

TILT

90

°

90

°

MODE

RANGE

SECTOR

TRAIN

TILT

Fold here

SECTOR TILT

FULL

HALF

EVENT

R/B

Record settings on label and insert it in label case on front panel.

1 2 3

CUSTOM MODE ENTER

CH-37

5-2

MENU SETTINGS

6.1 System Setting Menu

1. Turn on the power while pressing the MENU key. Release the key when you hear a beep. The SYSTEM menu appears.

** SYSTEM SETTING **

3D DISPLAY

SHIP’S POSITION

CURRENT DATA

DEPTH DATA

HEADING INDICATION

NORTH MARK

TRACK

: OFF

: OFF

: OFF

: OFF

: OFF

: OFF

: 10R

ON

L/L LOP

FLOW FROM FLOW TO

ON

TRUE

ON

20R

AZ

HDG/SPD DATA

NAV DATA

: NAV

: GPS

DR

DATA FORMAT FOR NAV2 : NMEA

CIF BAUD RATE

TVG CORRECTION

UNIT

V-MODE MANUAL TRAIN

DEGAUSSING INTERVAL

FACTORY SETTING

:

:

:

:

:

1200

OFF m

HALF

: 30 SEC

NO YES

CI

LORAN C LORAN A

DECCA

CIF

OTHERS

2400

1/2 ft fa

FULL

4800

1

HIRO


Default settings circumscribed.

Figure 6-1 SYSTEM SETTING menu

2. Select SYSTEM SETTING and press the MENU key.

3. Select items with up and down arrow keys; options with left and right arrow keys.

4. Press the MENU key to return to the system menu.

Note: Be sure to return to the system menu before turning

off the power, to properly register settings.

5. To return to normal operation, reset the power.

See the next page for SYSTEM SETTING menu description.

6-1

Table 6-1 System setting menu description

3

S

C

H

N

T

H

N

D

H

U

O

A

I

D

P

R

R

V

'

I S

T

S

R

D

E

H

P L

A

P

N

M

T

A Y

O

T

A

S

A

I

D

I

t e

T

A

R K

I

m

O

T A

N

D A T A F O R M A T F O R N A V 2

C I F B A U D R A T E

T

U

V

D

F

-

E

R

D

V

N

E

A

A

G

I

A

G

T

M O

G

C

D

C

/

C

A

T

I

K

S

N

P

O

D E

U

O

G

D

R R

S

R

M

S

Y

I

D

D

E C

A

N

S

I S

A T

N U

G

E

P

T

A

T I

I

L

O N

A L

N

T I

A

T

N

Y

T

E

G

R

R

A

V

I

A

N

L

D e s c r i p t i o n

T u r n s 3 D d i s p l a y o n / o f f .

T u r n s a n d l o p o n g i s i t i o t u d e n i n o r d

L i c a o r t i o n a n L o

O n / o

P .

f f a n d s e l e c t s p o s i t i o n f o r m a t ; l a t i t u d e

T u r n s c u r r e n t ( t i d e ) d a t a d i s p l a y m e t h o d ; f l o w f r o m , f l o w t o o r o f f .

T u r n s h e a d i n g a z i m u t h .

i n d i c a t i o n o n / o f f a n d s e l e c t s i t s f o r m a t ; t r u e o r

T u r n s n o r t h m a r k e r o n / o f f .

S e l e c t s o r 2 0 R l e n g t h

( t w e n t y o t f i c o u r s e m e s t h e il n e r a n p l o g e i t t i n g ; n u s

1 0 e ) .

R ( t e n t i m e s t h e r a n g e i n u s e )

S e l e c t s

C I ( C u r s r e o n t u

I r c e n d o f d a t i c a t o r ) .

a t o b e u s e d t o p l o t c o u r s e il n e ; N A V ( N a v i g a t o r ) ,

S e l e c t s

D E C C A , s o u r c e o f p

O T H E R S .

o s i t i o n d a t a ; G P S , L O R A N C L O R A N A , D R ,

S e l e c t s d a t a f o r m a t f o r n a v d a t a ; C I F ( F U R U N O ) o r N M E A .

S e l e c t s b a u d r a t e o f C I F d a t a ; 1 2 0 0 , 2 4 0 0 , 4 8 0 0 b p s .

C h a n g e s T V G a b s o r p t i o n c u r v e v a l u e t o a d d e d c o m p e n s a t e f o r a b s o r p t i o n a t t e n u a t i o n u l t r a s o n i c t h e o r e t i c a l w a v a b s e i n o r p t i w a t o n e v r .

a l u

O e

F F a d

, d

S t a e d n d a t o r d T V G

T V G c u c u r v e , r v e ,

1 ,

1

F u

/ 2 , ll

1 / 2 o f t h e o r e t i c a l t o T V G c u r v e .

o f

S e l e c t s

H I R O .

u n i t o f d e p t h m e a s u r e m e n t .

m , m e t e r s ; f t , f e e t ; f a , f a t h o m s ,

S e l h a l f e c t s c i r c l m a n u a l e , F u ll , f t r a u ll i n i n g s e c t o r c i r c l e .

w i d t h f o r t h e V e r t i c a l F a n m o d e .

H a l f ,

S e l e c t s s c r e e n d e g a u s s i n g i n t e r v a l .

Y e s r e s t o r e s d e f a u l t s y s t e m m e n u s e t t i n g s .

6.2 Screen Adjustment

Screen size and position can be adjusted as follows:

1. Turn on the power while pressing the MENU key to display the SYSTEM menu.

2. Select SCREEN ADJUSTMENT.


6-2

**

SCREEN ADJUSTMENT

**

H.SIZE

H. POSITION

V. SIZE

V. POSITION

DEFLECTION DIST.

BRIGHTNESS


Effective picture marker (inside)

Effective picture marker (outside)

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 direction.

[→]

, increases size;

[←]

, decreases size.

H. POSITION:

V.SIZE:

Adjusts picture position in horizontal direction.

[→]

,

[←] shift right, left, respectively.

Sets picture size in vertical direction.

[→]

, increases size;

[←]

, decreases size.

V. POSITION: Adjusts pictureposition in vertical direction.

[→]

,

[←] shift right, left, respectively.

DEFLECTION DIST: Adjust deflection in vertical direction. Adjust

[→]

,

[←]

to obtain square picture.

BRIGHTNESS: Adjust CRT brilliance.

[→]

, brighter;

[←]

, dimmer.

5. To return to the SYSTEM menu, press the MENU key.

6-3

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/SHIFT - E/S

COLOR

LANGUAGE


TRAIN/TILT TEST

SCREEN ADJUSTMENT

TEST PATTERN


DEFAULT

EXIT: TURN OFF THE UNIT

Figure 6-3 System menu

Range - sonar mode menu

1. Select RANGE-SONAR MODE from the SYSTEM menu.


7

8

5

6

3

4

1

2

9

10

11

12

**

RANGE - SONAR MODE

**

: 50

: 100

: 150

: 200

: 250

: 300

: 400

: 500

: 600

: 800

: 1200

: 1600

FACTORY SETTING : NO YES


Figure 6-4 Range - sonar mode menu

6-4

3. Select range.

4. Set range.


6. To quit, reset the power.

Range - vertical fan mode

1. Select RANGE-VERTICAL FAN MODE from the SYSTEM menu.


7

8

5

6

3

4

1

2

9

10

11

12

**


**

: 20

: 40

: 60

: 80

: 100

: 120

: 160

: 200

: 240

: 280

: 320

: 400



Figure 6-5 Range - vertical fan mode menu

3. Select range.

4. Set range.



6-5

6-6

Range/shift - e/s

1. Select RANGE/SHIFT - E/S from the SYSTEM menu.


**

RANGE/SHIFT - E/S

**

RANGE 1

2

3

4

5

SHIFT 1

2

3

4

5

:

:

:

:

:

:

:

:

:

:

40

80

160

240

320

20

20

40

80

80



Figure 6-6 Range/shift - e/s screen

3. Select range (shift).

4. Set range (shift).



Color setting

The color setting screen allows you to adjust display colors.

1. Select COLOR from the SYSTEM menu.


**

COLOR

**

2

1

4

3

6

5

8

7

12

11

10

9

LEVEL : R G B

15 : 11 0 0

14

13

: 13

: 15

0

0

0

0

: 15

: 14

: 14

: 14

4

6

9

11

0

0

0

0

: 13

: 11

: 0

: 0

: 0

: 0

: 0

: 0

13 0

13 0

13 0

12 9

11

6

11

10 12

8 12

12

HUE 1

TEXT

BKGD

MENU

HUE 2

TEXT

BKGD

MENU

HUE 3

TEXT

BKGD

MENU



: R G B

:11 11 11

: 0 0 0

: 0 0 9

: R G B

:15 15 15

: 0 0 9

: 0 0 12

: R G B

:15 15 15

: 0 0 11

: 0 0 15

Figure 6-7 Color setting screen

3. Select color.

4. Set color.



6-7

6-8

Factory setting menu (restoring default settings)

1. Select DEFAULT from the SYSTEM menu.


**

DEFAULT

**

ARE YOU SURE? : NO YES


NOTE! ALL SETTINGS INCLUDED IN SYSTEM MENU

WILL BE CHANGED TO FACTORY SETTING

Figure 6-8 Default screen

3. Select YES and press the MENU key to restore default settings.



Display test - operation

1. Select DISPLAY TEST - OPERATION from the SYSTEM menu.

2. Press the MENU key. TEST appears on the screen while the display unit is being tested.


6.4 Dual Menu

Press the [MENU] and choose DUAL to open DUAL menu.

MENU

DUAL MODE


: E/S BOTTOM SONAR

NET MOUTH SHIFT : 1

NET MOUTH WIDTH : 100

NET MOUTH HEIGHT : 30

NET DEPTH : AUTO MANUAL OFF

HOR SCAN RATE : 1

VER SCAN PATE : 1


Description of DUAL menu

DUAL MODE: Choose the display to show on the lower 1/3 of

the combination display. E/S: Echosounder, BOTTOM: Vertical 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. The setting range is -999 to +999 (m) and the default setting is 0 m. (Setting range and default setting change with unit of measurement.)

NET MOUTH WIDTH: Set the left/right width of the net mouth

mark. The setting range is 1-999 (m) and the default setting is

100 m. (Setting range and default setting change with unit of measurement.)

NET MOUTH HEIGHT: Set the up/down width of the net mouth

mark. The setting range is 1-999 (m) and the default setting is

30 m. (Setting range and default setting change with unit of measurement.)

NET DEPTH: Choose the net mouth mark depth setting method.

The default setting is AUTO. AUTO: Use the IEC/NMEA depth data sentence DBS. MANUAL: Set the depth with the [

↑

] or [

↓

] key on the sub panel.

HOR SCAN RATE: Set the horizontal scan rate for the combi-

nation mode; that is, the number of horizontal scans produced per line drawn in the combination display. The setting range is

1-10 and the default setting is 1.

VER SCAN RATE: Set the vertical scan rate for the combina-

tion mode. that is, the number of vertical scans produced per line drawn in the combination display. The setting range is 1-

10 and the default setting is 1.

6-9

6-10

(This page intentionally left blank.)

MAINTENANCE & TROUBLESHOOTING

Good performance depends on regular maintenance. Following 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.

Only qualified personnel should work inside the equipment.

7.1 Maintenance of Display Unit

• Handle with care. Corrosion may start even from a scratch.

• Allow space around the unit for ventilation.

• Keep it away from equipment with magnets (such as a speaker, large capacity transformer) and also magnetic-sensitive units such as gyrocompass or cassette tape.

• Clean the filter and screen with a wet or dry soft cloth. Do not use commercial cleaners to clean the display unit — they can remove paint and markings.

• Cover the display unit when it is not in use.

• Degauss the display with the DEGAUSS key when picture color is abnormal.

7.2 Maintenance of Transceiver Unit

Keep the unit clean, especially the cable entrance. Wipe off dust or oil with a cloth dampened in water-diluted mild detergent.

7-1

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 retainer) 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.

Also be sure to press and hold down the brake-off switch while manually raising/lowering the transducer. Failure to press the switch may damage the raise/lower motor.

1. Turn off the breaker on the hull unit.

2. Remove the brake-off switch cover.

3. Set 19 mm socket wrench and turn it while pressing the brake-off switch.

4. Check that the transducer can be raised/lowered smoothly with a constant force from the upper to the lower limit positions. If not, centers of the main body flange and the retraction tank are not aligned. Adjust the hull unit mounting position.

Brake-Off switch

Raise

Lower

Breaker

Figure 7-1 Using the hand crank

7-2

7.4 Display Unit Test

This test checks the ROM, RAM and keyboard for proper operation.

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


RANGE/SHIFT - E/S

COLOR

LANGUAGE


TRAIN/TILT TEST

SCREEN ADJUSTMENT

TEST PATTERN


DEFAULT

EXIT: TURN OFF THE UNIT

Figure 7-2 System menu

2. Select DISPLAY TEST1 - ROM/RAM/ KEY with the arrow keys on the sub panel 2.

3. Press the MENU key to start the test. The program no., Tx frequency, and pitch and roll angles are displayed, and the

ROM, RAM, SI/O are checked.

4. Operate each key and control on the main panel, sub panel and remote control box. A pressed key’s on-screen indication changes to 1 when the key is pressed; 0 when it is released.

5. To return to the SYSTEM menu, press the MENU key again.


7-3

ROM Program version

NO. is displayed, ROM

RAM and serial ports are checked for proper operation, and Tx frequency, roll angle and pitch angle are displayed.

Remote Control

Box check. Switch is normal if value changes when switch is operated.

** DISPLAY TEST **

PROGRAM NO. 0650101-xxx MAIN PANEL

ROM OK * * *

SRAM

VRAM

OK

OK

12

0

12

255

SIO1

SIO2

OK

OK

TX FREQUENCY 60KHZ

12

0 0

X: 0 Y: 0

0

0

ROLL

PITCH

0

0

0 0 0

0

0

0

REMOTE CONTROL

0 0

SUB PANEL

0 255 255 255 *

0

0

0 * *

0 0 0 0

0

0 0

0 0 0 0 0

0 0 EXIT

0 0 0


Figure 7-3 Display unit test results

Main panel check. Switch is normal if value changes when switch is operated.

Sub panel check. Switch is normal if value changes when switch is operated.

7-4

7.5 Train/Tilt Test

This test checks the transducer training and tilting functions for proper operation.


MENU key.

2. Select TRAIN/TILT TEST with the arrow keys in the sub panel 2.

3. Press the MENU key to start the test.



** TRAIN / TILT TEST **

-- PHOTO SENSOR CHECK --

TRAIN

0

°

180

°

OK

OK

+10

°

90

°

190

°

TILT

OK

OK

OK

-- TRAIN CHECK --

0

180

0

180

→

→

→

→

180

°

( CW)

0

°

( CW)

180

°

(CCW)

0

°

(CCW)

PULSES

1428

1449

1427

1451

NG

0

0

0

0

-- TILT CHECK --

+10

90

190

90

→

→

→

→

90

°

190

°

90

°

+10

°

PULSES

1206

939

919

1225

TEST COUNT =


NG

0

0

0

0

8

Figure 7-4 Train/tilt test results

This checks the photo sensors which detect the reference angles for training and tilting operations.

This checks the transducer training operation. The four digit figures show the number of pulses used to train the transducer by 180.

If training is abnormal, NG

(No Good) count increases by one.

This checks the transducer tilting operation. If the number of pulses used to tilt the transducer is abnormal, NG count increases by one.

7-5

7.6 Test Pattern

This test checks display position and colors.


MENU key.

2. Select TEST PATTERN with the arrow keys in the sub panel

2.

3. Press the MENU key to start the test.

BLACK RED GREEN

BLUE

Position check

Figure 7-5 Test pattern



7.7 Error Messages

Raise/lower error message

If the power is not applied to the hull unit, the following message appears on the screen and the buzzer sounds.

HULL UNIT

POWER OFF

(CHECK BREAKER AND FUSE)

PRESS R/B KEY TO SILENCE ALARM

Figure 7-6 Raise/lower error message

If this occurs, turn the power off and check the breaker and fuse as the screen suggests.

7-6

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)


Figure 7-7 Transceiver unit error message

If this occurs, turn the power off and check the fuse as the screen suggests.

Speed warning

Because the transducer may be damaged if it is kept lowered when ship’s speed exceeds 15 knots (based on the speed relative to ground fed from nav sensor), the following message appears and the buzzer sounds.

Press the R/B key to silence the buzzer and return to the normal sonar picture. Raises the transducer.

TRANSDUCER

REMAINS

LOWERED

(REDUCE SHIP’S SPEED AND PRESS

↑

KEY)


Figure 7-8 Speed warning

7-7

7-8

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 convenience.

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. Turn the PWR switch off and contact your service agent at your earliest convenience.

TILT NG

Figure 7-10 Tilt error message

7.8 Troubleshooting Table

The table below provides common symptoms of equipment troubles and the means to rectify them. If normal operation cannot be restored, do not check inside the system. Any repair work is best left to a qualified technician.

Symptom

No picture

Bottom echo becomes irregular

Check

Power supply.

Check ship’s mains voltage at the power plug connected to the power unit.

FUSE

Fuse.

If blown, replace with 10A fuse. Call service technician if it blows again.

NEVER use a fuse of a higher rating.

POWER CABLE

1

+

2

-

3

SHIELD

Rough seas.

Distance to sea bottom changes due to rolling and pitching.

Long range selected.

Since transmission period is a little longer, ship’s rolling and pitching are apt to effect detection of echo.

Weak echo

Somewhat strange color

TX OUTPUT POWER set to other than

"C."

Check the TX OUTPUT POWER setting on the SONAR menu, and set it to "C" for max. output power.

MENU

TX RATE

: SONAR BOTTOM/3D E/S

: 10

TX PULSE LENGTH : LONG

TX OUTPUT POWER : A

SHORT

B C (MAX)

TVG effect is excessive.

Excessive TVG results in elimination of useful echoes.

Note: Readjustment of TVG is required whenever the GAIN control is adjusted.

BRILL control set too low.

Increase the brightness.

0 10

LEVEL

0 10

TIME

TVG

0

10

BRILL

(Continued on next page)

7-9

Symptom

Color partially irregular

Picture distorted

Check

Magnet is near the screen.

This symptom occurs if equipment which contains a magnet (loudespeaker, etc.) is placed near the screen. Check to see if the degaussing circuit is turned off on the SYS-

TEM SETTING menu. See page 6-

2.

Note: If not cleared, consult with electronics technician.

Equipment generating strong magnetic field is near display unit.

Locate magnetic field generating equipment (rectifier, etc.) well away from the display unit.

Picture contains noise

Equipment not grounded properly.

Carefully check the ground.

Display Unit Transceiver

Unit

Power cable is run alongside the signal cable.

Signal cable may pick up noise emitted from power cable of other equipment; therefore, separate them from each other.

Debris may be on sea surface.

Reject unwanted echoes with the

Signal cable interference rejector on the SONAR menu, TVG control or NL control.

Copper plate

Power cable of other set

Separate physically

7-10

(FRONT)

FISHING GROUND

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

CUSTOM MODE KEY LABELS

(BACK)

MODE

RANGE

SECTOR

TRAIN

TILT

200m

0

°

225

°

30

°

MODE

RANGE

SECTOR

TRAIN

TILT

200m

0

°

360

°

30

°

MODE

RANGE

SECTOR

TRAIN

TILT

100m

180

°

Cut out label, record settings on label, fold in half and insert in label case.

Fold here

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

FISHING GROUND

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

MODE

RANGE

SECTOR

TRAIN

TILT

AP-1

SPECIFICATIONS OF COLOR SECTOR SCANNING SONAR

CH-37

1. GENERAL

(1) Display System

(2) Picture Color

(3) Display Mode

(4) Range/Train Speed

Range Detection Range (m)

60 kHz

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

3) Vertical fan mode display*

4) 3D mode display (front view)

5) 3D mode display (slant view)

*: E/S combination display is optionally available in modes 1) and 3).

Optional external E/S interface is required.

162 kHz

Train Speed **

(sec./360°)

1

2

0-50

0-100

0-50

0-100

3.8

4.3

3

4

5

0-150

0-200

0-250

0-150

0-200

0-250

4.8

5.4

6.0

8

9

6

7

0-300

0-400

0-500

0-600

0-300

0-350

0-400

0-450

6.7

7.6

8.6

10.0

10

11

0-800

0-1200

0-500

0-600

12.0

16.0

12 0-1600 0-800 21.0

**: Measured at fast train mode of 60 kHz (reference only).

Display sector width is selected among 45°, 90°, 135°, 180°, 225° and 360° by horizontal, 36°, 60°, 96°,

120°, 156° and 180° by vertical.

2. DISPLAY UNIT

(1) Display System

(2) Color Hue Control

(3) Contrast

(4) Display Mode

(5) Unit Indication

PPI display on high resolution 15”(381mm) color CRT

LOG, linear, square

Variable

Vertical Mode, Slice Mode, 3D Mode m, ft, fa

SP - 1

(6) Horizontal Range

(7) Vertical Range

(8) E/S Range*

(9) E/S Shift*

(10) Offcenter

12 steps during 30 m to 1600 m



1000 m max.

(11) TVG

(12) Clutter

4 point at Expand mode, according to the train setting

2 point at Slice mode, according to the tilt setting

Level(100 dB max.), Range(1000 m max.)

Variable, Hue control

(13) Elimination Interference Correlation with before data

(14) Audio Monitor 2 W, 4 ohms using external speaker SC-05WR(option)

*: Optional external E/S interface is required.

3. TRANSCEIVER

(1) Frequency

(2) Output Power

(3) Beamwidth

(4) Pulselength

60/162 kHz selected by internal settings

0.8 kW(60 kHz), 1.5 kW(162 kHz)

-6 dB,

0.2 to 10.6 ms, varied according to the range in use

(selected on the Menu)

4. HULL UNIT

(1) Train Step 45° step by fast scan mode or 6° step by normal mode

(2) Tilting

Horizontal mode

Vertical Fan Mode

(3) Transducer Travel

(4) Raise/Lower Time

Tilt Range: +5° to 90°, Tilt Step: 1° step

Tilt Range: 0° to +180°, Tilt Step: 6°(fast scan) or 3°(normal)

400 mm

10 sec approx. (24/32 VDC)

(5) Allowable Ship’s Speed 18 knots or less

(15 knots during raise/lower operation)

5. POWER SUPPLY AND CONSUMPTION

(1) Display Unit 24/32 VDC (20 to 41.6VDC), 140 W approx. or

(2) Transceiver Unit

100/110/200/220 VAC, 50/60 Hz , 1

24/32 VDC (20 to 40 VDC), 50 W approx. or

(3) Hull Unit

100/110/200/220 VAC, 50/60 Hz , 1

24/32VDC, 50 W approx. (150 W while traveling)

AC spec. set requires rectifier RU-1746B-2

SP - 2

6. ENVIRONMENTAL CONDITION

(1) Ambient Temperature 0°C to 50°C

(2) Relative Humidity 95% or less (at 40°C)

7. CORTING COLOR

(1) Display Unit Chassis: 2.5GY5/1.5

(2) Hull Unit

(3) Transceiver Unit

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

A

AUDIO control 2-9

AUTO TRAIN key 3-3

Auto train sector (vertical fan mode) 3-8

B

Background color 1-6

Beamwidth (vertical fan mode) 3-8

Bottom/3D menu 3-8

BRILL control 1-3

C

Color adjustment 6-7

Color quantity 2-16

Custom mode key labels AP-1

Custom mode keys (

¡

,

™

,

£

) 5-1–5-2

D

Default menu settings 8-9

DEGAUSS key 1-6

DIMMER control 1-3

Display unit care 7-1

Display unit test operation 6-8

ROM, RAM, keyboard 7-3

E

E/S key 1-2, 1-5

E/S menu 2-17

Echo resolution

Sonar mode 2-16

E/S mode 2-18

ENTER key 1-2, 5-1

Error messages 7-6–7-8

EVENT key sonar mode 2-10 vertical fan mode 3-6

Event marker sonar mode 2-10 vertical fan mode 3-6

F

FAST SCAN key sonar mode 2-3 vertical fan mode 3-4

FULL/HALF key 2-11

G

GAIN control 2-7

H

Horizontal marker 3-6

HUE key 1-6

Hull unit care 7-2

I

Indications sonar mode 2-24–2-25 vertical fan mode 3-12

IR control sonar mode 2-8 vertical fan mode 3-5

K

Keying pulse synchronization 2-17

M

Main panel description 1-1

Maintenance

Display unit 7-1

Hull unit 7-2

Transceiver unit 7-1

Menu tree vii

MODE control 1-4

Motion Sensor MS-100 2-16

N

NL control 2-8

O

Output power 2-12, 2-16

P

Presentation mode 1-4

Pulselength 2-12, 2-15

PWR switch 1-3

R

R/B key sonar mode 2-10 vertical fan mode 3-6

R/B marker 2-10

Raise/lower error message 7-6

RANGE control sonar mode 2-2 vertical fan mode 3-2

INDEX

Index-1

Range preset e/s mode 6-4 sonar mode 6-4 vertical fan mode 6-5

S

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

T

Test pattern 7-6

Tilt angle 2-4

TILT control sonar mode 2-4, 2-14 vertical fan mode 3-4

Tilt error message 7-6

TRACK key 2-17

TRAIN control sonar mode 2-15 vertical fan mode 3-3

Train error message 7-8

Train/tilt test 7-5

Transceiver unit care 7-1

Transceiver unit error message 7-7

TRANSDUCER switches 1-3

Troubleshooting display unit test 7-3 error messages 7-6 test pattern 7-6 train/tilt test 7-5 troubleshooting table 7-9

TVG control sonar mode 2-13 vertical fan mode 3-7, 3-8

Tx rate 2-15

Tx rate adjustment 2-8

V

V:H RANGE key 3-2

Vertical marker 3-6

Index-2

Furuno CH-37 Radar Detector User Manual

COLOR SECTOR SCANNING SONAR

MODEL

SAFETY INSTRUCTIONS

ELECTRICAL SHOCK HAZARD

iiiiiiiiiiiii

CAUTION

TABLE OF CONTENTS

FOREWORD

SYSTEM CONFIGURATION

MENU TREE

OPERATIONAL OVERVIEW

SONAR MODE

VERTICAL FAN MODE

3D MODE

CUSTOM MODE KEYS ( 1 , 2 , 3 )

MENU SETTINGS

MAINTENANCE & TROUBLESHOOTING

CUSTOM MODE KEY LABELS

SPECIFICATIONS

INDEX

Features

FOREWORD

SYSTEM CONFIGURATION

MENU TREE

OPERATIONAL OVERVIEW

1.1 Control Description

Main panel

Sub panel

1.2 Turning the Power On/Off

Power on

Power off

Note: The transducer is automatically retracted into the tank

1.3 Adjusting Screen Brilliance, Panel Backlighting

1.4 Lowering the Transducer

CAUTION

1.5 Presentation Mode

Note: Asterisk-marked modes require external signal interface

1.6 Background Color

1.7 Degaussing the Screen

SONAR MODE

2.1 Typical Operating Procedure

2.2 Selecting Range

Note: Unit of range measurement may be changed through

2.3 Selecting Sector, Sector Stepping

Sector width

Sector step

2.4 Setting the Tilt Angle

Bottom echo and tilt angle

How to discriminate fish echoes from the bottom

Points to consider

Tilt angle for surface fish

Suitable tilt angle

2.5 Adjusting Gain

2.6 Rejecting Sonar Interference and Noise

Identifying noise source

Rejecting noise with the interference rejector

Rejecting noise with NL control

Rejecting interference with Tx rate

Note: When the sonar is used in shallow water with the range

2.7 Detecting Fish Schools Aurally

2.8 R/B and Event Markers (trackball operation)

2.9 Selecting Training Sector Quickly

2.10 Suppressing Bottom and Sea Surface Reflections

in Shallow Fishing Grounds

2.11 Suppressing Bottom Tail

2.12 Displaying Surface Fish Clearly (TVG adjustment)

To adjust the TVG;

2.13 Relocating Fish School for Easy Observation

2.14 Finding Fish School Center

2.15 Sonar Menu Operation

Operating procedure

Sonar menu description

TX RATE: Selects transmission repetition rate in ten steps. “1”

TX PULSE LENGTH: Selects Tx pulselength to “LONG” or

TX OUTPUT POWER: Adjusts output power; “A” is for mini-

TX EXT SYNC: If two or more echo sounders or sonars are

IR: Rejects interference. Turn off when no interference exists,

STABILIZER: Select “ON” when the Motion Sensor MS-100

COLOR: Selects 16- or 8-color presentation.