Furuno CSH-73 User Manual

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COLOR SCANNING SONAR

MODEL

CSH-73

9-52 Ashihara-cho,9-52 Ashihara-cho,

*00080806200**00080806200*

*OME13080C00**OME13080C00*

Nishinomiya, JapanNishinomiya, Japan

Telephone :Telephone : 0798-65-21110798-65-2111 Telefax :Telefax : 0798-65-42000798-65-4200

Your Local Agent/DealerYour Local Agent/Dealer

ll rights reserved.

PUB.No.PUB.No. OME-13080OME-13080

(( DAMIDAMI ))

CSH-73CSH-73

Printed in JapanPrinted in Japan

FIRST EDITION :FIRST EDITION : OCT.OCT. 19971997

C :C : APR.APR. 05,200205,2002

* 0 0 0 8 0 8 0 6 2 0 0 ** 0 0 0 8 0 8 0 6 2 0 0 *

*OME13080C00**OME13080C00*

* O M E 1 3 0 8 0 C 0 0 ** O M E 1 3 0 8 0 C 0 0 *

SAFETY INSTRUCTIONS

WARNING

Do not open the equipment.

Hazardous voltage which can cause electrical shock, burn or serious injury exists inside the equipment. Only qualified personnel should work inside the equipment.

Do not disassemble or modify the equipment.

Fire, electrical shock or serious injury can result.

Turn off the power immediately if water leaks into the equipment or the equipment is emitting smoke or fire.

Continued use of the equipment can cause fire or electrical shock.

CAUTION

Use the proper fuse.

Use of a wrong fuse can result in fire or permanent equipment damage.

Do not use the equipment for other than its intended purpose.

Personal injury can result if the equipment is used as a chair or stepping stool, for example.

Do not place objects on the top of the equipment.

The equipment can overheat or personal injury can result if the object falls.

Do not exceed speed noted in the specifications when operating the equipment or lowering or raising the transducer.

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.

Do not operate the equipment with wet hands.

Electrical shock can result.

Keep heater away from equipment.

Heat can alter equipment shape and melt the power cord, which can cause fire or electrical shock.

The transducer may become damaged.

The zinc block attached near the transducer must be replaced yearly.

The junction between the transducer and main shaft may corrode, which can result in loss of the transducer or water leakage inside the ship.

iiiiiiiiiiiii

FOREWORD

A Word to CSH-73 Owners ......................................................................................................v

Features..................................................................................................................................... v

System Configuration ..............................................................................................................vi

CONTROL DESCRIPTION

Control Layout on Display Unit and Remote Control Box ...................................................1-1

Main Panel.............................................................................................................................1-2

Sub Panel 1 ............................................................................................................................1-4

Sub Panel 2 (data setting window) ........................................................................................1-5

Remote Control Box..............................................................................................................1-8

OPERATIONAL OVERVIEW

Turning the Power On/Off .....................................................................................................2-1

Adjusting Screen Brilliance, Control Panel Backlighting .....................................................2-1

Lowering the Transducer.......................................................................................................2-1

Selecting a Display Mode......................................................................................................2-2

Selecting a Display Range.....................................................................................................2-3

Setting the Tilt Angle.............................................................................................................2-3

Adjusting the Gain.................................................................................................................2-4

Measuring Range and Bearing to a Target.............................................................................2-4

FINE TUNING THE PICTURE

Eliminating Unwanted Feeble Echoes...................................................................................3-1

Suppressing Seabed Tail ........................................................................................................3-3

Suppressing Seabed and Sea Surface Reflections in Shallow Waters ...................................3-4

Rejecting Sonar Interference and Noise ................................................................................3-4

Adjusting Beamwidth ............................................................................................................3-7

MARKS AND DA T A

Marks, Data and Display Mode.............................................................................................4-1

Permanently Displayed Marks and Data ...............................................................................4-3

Erasable Marks and Data .......................................................................................................4-4

USER MENU OVERVIEW

USER Menu Operation..........................................................................................................5-1

USER Menu Description .......................................................................................................5-3

FUNCTION KEYS

Programming the Function Keys ...........................................................................................6-1

Replaying a Function Key .....................................................................................................6-2

Function Key Fine Tuning.....................................................................................................6-2

Saving Function Key Settings to a Memory Card .................................................................6-3

Replaying Function Key Settings from a Memory Card .......................................................6-3

ADVANCED LEVEL OPERATION

Finding Fish School Center ...................................................................................................7-1

Tracking a Fish School (target lock)......................................................................................7-2

Detecting Fish Schools Aurally .............................................................................................7-7

The Fish Alarm......................................................................................................................7-8

Relocating Fish School for Easy Observation .......................................................................7-9

Comparing of Fish School Concentration ...........................................................................7-10

Measuring Fish School Speed .............................................................................................7-11

The Event Mark...................................................................................................................7-12

True Motion Display............................................................................................................7-14

Plotting Net Location Mark .................................................................................................7-15

Setting Distances Between Net Sonde Transmitters............................................................7-16

Observing Net Behavior ......................................................................................................7-17

Port/Starboard, Horizontal Slice Displays...........................................................................7-18

Turning Marks, Data On/Off ...............................................................................................7-20

SAVING, REPLAYING PICTURE

Initializing Memory Cards.....................................................................................................8-1

Saving the Picture..................................................................................................................8-2

Transferring Echo Data from Internal Memory to Memory Card.........................................8-2

Saving Net Shooting Data .....................................................................................................8-3

Replaying Saved Data ...........................................................................................................8-4

Deleting Memory Card Contents...........................................................................................8-4

INTERPRETING THE DISPLAY

Seabed Echoes .......................................................................................................................9-1

Fish Schools...........................................................................................................................9-2

Sea Surface Reflections .........................................................................................................9-3

Wake ......................................................................................................................................9-3

False Echo by Sidelobe..........................................................................................................9-4

Noise and Interference...........................................................................................................9-4

WARNINGS

Overvoltage Warning ...........................................................................................................10-1

Unretracted Transducer W arning.........................................................................................10-1

iii

SELF TESTS

Opening the Self Test Menu ................................................................................................11-1

Self Test Description............................................................................................................11-2

Interface Unit CS-120A Self Test ........................................................................................11-5

MAINTENANCE

Display Unit Maintenance ...................................................................................................12-1

Hull Unit Maintenance ........................................................................................................12-2

SPECIAL MENU DESCRIPTION

SYSTEM Menu Description ...............................................................................................13-1

DATA SET Menu Description .............................................................................................13-4

INIT SET/TEST Menu Description.....................................................................................13-7

MENU TREE..................................................................................................................A-1

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

INDEX.............................................................................................................................. IN-1

FOREWORD

A Word to CSH-73 Owners

Congratulations on your choice of the FURUNO CSH-73 Color Scanning Sonar. We are confident you will see why the FURUNO name has become synonymous with quality and reliability.

For over 40 years FURUNO Electric Company has enjoyed an enviable reputation for quality marine electronics equipment. This dedication to excellence is furthered by our extensive global network of agents and dealers.

This equipment is designed and constructed to meet the rigorous demands of the marine environment. However, no machine can perform its intended function unless operated and maintained properly . Please carefully read and follow the recommended procedures for operation and maintenance.

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

Thank you for considering and purchasing FURUNO equipment.

Features

The FURUNO CSH-73 Color Scanning Sonar is a half-circle, multibeam electronic scanning sonar which detects and instantaneously displays fish schools and underwater conditions in 16 colors on a 15" non-glare, high resolution CRT screen.

The main features of the CSH-73 are

• Vivid 16-color display provides intuitive recognition of seabed and concentration, distribution and volume of fish schools.

• Markers and indications keep the operator abreast of fishing conditions.

• Remote control box provides for armchair control of major functions.

• New gain, range or tilt setting appears in large characters whenever corresponding control is adjusted.

• Function keys automatically setup the equipment to perform specific task.

• High power MOS FET transmitter ensures reliable operation under any condition.

System Configuration

STANDARD

REMOTE CONTROL BOX

CSH-116

SHIP’S MAINS 100 VAC, 1φ, 50/60 Hz

TRANSCEIVER UNIT

CSH-710

DISPLAY UNIT

CSH-731

INTERFACE UNIT

CS-120A

OPTION

REMOTE DISPLAY

CSH-106

110/115/220/230 VAC, 1φ, 50/60 Hz

IE/S NTERFACE UNIT

SUB DISPLAY

CSH-736

SHIP’S MAINS 100 VAC, 1φ, 50/60 Hz

STEP-DOWN

TRANSFORMER

PT-400

SPEED LOG AD CONVERTER NAVIGATOR CURRENT INDICATOR COLOR VIDEO SOUNDER

VI-1100A

SHIP’S MAINS 100/110/220 VAC, 1φ, 50/60 Hz

HULL UNIT CSH-71080 ( 800 mm stroke) CSH-71120 (1200 mm stroke)

including POWER SUPPLY UNIT

CSH-720

FNZ JOINT BOX

CS-170

E/S INTERFACE UNIT

ECHO SOUNDER, COLOR VIDEO SOUNDER

NET SONDE

CONTROL DESCRIPTION

Control Layout on Display Unit and Remote Control Box

PUSH-OPEN

SUB PANEL 2

OFF

AUTO TRAIN

WIDTH

NET

COURSE

EVENT1

ESTI-

MATE1

FISH

POWER

RANGE

TARGET

EVENT2

TRAIN

LOCK

DIM CONT BRILL AUDIO

ESTI-

MATE2

OFFCENT

TRANSDUCER

F3F2F1

TILT

RECALL

SUB PANEL 1

MEMOHISTE/SNORM

GAIN

AUTO

TILT

WIDTH

MAIN PANEL

DISP SELECT

EVENT

TGT LOCK

ESTIMATE

NET COURSE

FISH

234

+ –

RANGE

AUTO

TRAIN

OFFCENT

FUNCTION

–

GAIN

TGT SLICE

AUTO

BOOST

SHOOT

DATA

MEMO

RECALL

TILT

SCAN DEPTH

REMOTE CONTROL BOX

Figure 1-1 Display unit and remote control box

1-1

Main Panel

OFF

AUTO

TRAIN

POWER

RANGE

TRANSDUCER

F3F2F1

RECALL

GAIN

MEMOHISTE/SNORM

AUTO

TILT

WIDTH

NET

COURSE

EVENT1

ESTI-

MATE1

FISH

TRAIN

TARGET

LOCK

EVENT2

ESTI-

MATE2

OFF-

CENT

TILT

DIM CONT BRILL AUDIO

Figure 1-2 Main panel Main panel control description

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WIDTH

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Control Function

NORM, E/S, HIST (Mode keys)

RECALL, MEMO RECALL: Replays saved picture.

RANGE Selects a picture display range. Range selected appears on the display. GAIN Adjusts receiver sensitivity. TRAIN Rotates the transducer. The center of the sounding beam can be

AUTO TRAIN WIDTH

TILT Changes the tilt angle of the sounding beam between 0°and 90°. AUTO TILT,

WIDTH

Select display mode: NORM, normal sonar picture; E/S, Echosounder combination; HIST, Historical display.

Lamp above a key lights to show current selection.

MEMO: Saves picture to memory card or internal memory.

oriented in any direction between 165° port and 165˚ starboard. Press AUTO TRAIN to train the transducer automatically within

±30°, ±60°, ±90° or ±120° sector as selected with the WIDTH key. The lamp above the switch lights during the automatic training

operation.

Automatically tilts the sounding beam up and down in 2° steps within the tilt angle selected by the WIDTH key. The lamp above the key

lights when automatic tilt is on. NET COURSE Marks location of net. TARGET LOCK Tracks a fish school. EVENT , Inscribe event mark on the display, to find horizontal range, depth and

bearing to a target. Note that the EVENT key can function the

same as the SHOOT key of the remote control box. This can be done

on OTHER sub-menu in the INIT/SET menu ESTIMATE 1, 2 Compares volume of two fish schools. FISH Measures fish school speed. OFF-CENT Relocates selected target. DIM Adjusts the backlighting of the control panels and the brightness of

the lamps above keys. CONT Adjusts screen contrast.

BRILL Adjusts screen brilliance. AUDIO Adjusts volume of built-in loudspeaker, which monitors a target

appearing along the bearing marker. TRACKBALL Follows on-screen movement of trackball mark, to enter marks and

off-center the screen.

1-3

Sub Panel 1

MEMORY CARD DRIVE

CARD EJECT BUTTON

Figure 1-3 Sub panel 1 Sub panel 1 control description

POWER

OFF

CARD

REPLAY

COLOR

TRANSDUCER

END

HELP

NET

REPLAY

RECALL

F5F3F2F1

MEMOHISTE/SNORM

Control Function

MENU Opens/closes the menu. END • When the menu is displayed it terminates menu operation and

returns control to the sonar picture.

• When in a sub menu it returns to previous sub menu.

HELP Provides operating information for current menu.

cd[ \

Select items on menus.

CARD REPLAY Replays card-stored control and menu settings. COLOR Changes display color among four choices. NET REPLAY Replays internally stored net shooting data. To replay, press key to

light lamp above it, select item to replay, and press the key again.

TX Press to transmit, when transducer is lowered. Lamp lights during

transmission.

1-4

Sub Panel 2 (data setting window)

ITEM

(TVG•TX selected)

This example shows settings of TVG and TX.

SONR•BEAM

OPER P-SET

(TOGGLE)

TVG•TX

SIGNAL

DELETE MK

AUTO

ALM•AUDIO

CURRENT SETTINGS for item selected (TVG•TX)

NEAR7MEDIUM

+ + + + + + – – – – – –

Item selection keys Select item.

TVG TX

FAR

Setting change keys Change control setting.

CYCLE

OUTPUT

Main

Item

TVG•TX

OPER P-SET key Opens/closes data setting window.

Figure 1-4 Sub panel 2 Sub panel 2 control description

Item

Main Sub

NEAR 0–9

TVG

TRANSMIT

MEDIUM 0–9

FAR 0–9

CYCLE 0–9

PL 0–9

Setting

Range

Description

Adjusts receiver gain within 100 m.

Adjusts receiver gain between 100 m and 400 m.

Adjusts receiver gain beyond 400 m.

Sets Tx cycle. 9 is normal setting (fastest). "0" synchronizes with external KP.

Sets Tx pulselength. 9 is normal setting.

Normal

Setting

(Continued on next page)

OUTPUT 0–9

Sets Tx output power. 9 is maximum power.

1-5

Main

Item

Main Sub

SIGNAL PROCESS

Setting

Range

NL 0–10 Rejects unwanted echoes. 3

Automatically reduces receiver

AGC 0–10

2AGC* 0–4

gain against strong echoes such as seabed. Adjust so fish echo is displayed near seabed.

Suppresses seabed echoes. If AGC alone cannot suppress seabed echoes, use 2AGC.

Description

Normal

Setting

SIGNAL

SIGNAL PROCESS

ES1 (Net Recorder)

Selects echo level versus presen-

CURVE 1–4

IR 0–3

AFGLOW 0–4

RANGE (DN RNG)

GAIN 0–10 Adjusts receive sensitivity. 5

SHIFT (UP RNG)0–1000 m

NL 0–10

COLOR 0–9

Pos.

ON,

OFF

tation color curve. The higher the setting, the easier it is to see weak echoes on the screen.

Rejects random noise and interference by other echo sounders or sonars.

Adjusts echo afterglow, which is useful for watching echo movement. The higher the setting the longer the afterglow remains.

Sets depth range of echo sounder picture. Sets range of net recorder downward sounding.

Sets display start depth of echo sounder picture. Sets range of net recorder upward sounding.

Rejects blue dots (caused by dirty water) on entire screen.

Eliminates echoes displayed in colors specified.

Eliminates interference by other sonars or echo sounders.

160 m

0 m

OFF

Each pressing erases oldest mark among event mark , event mark , fish mark, own ship mark.

Each pressing deletes 1/5 of overall length of ship's track. If target lock function in on, sixth pressing deletes the fish school track and cancels target lock mode.

DELETE MK

DELETE MARK

+ or -

key to

erase.

TRACK

*2AGC and HOR functions cannot be used together. If one is used the other is automatically set to “0”.

(Continued on next page)

1-6

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*HOR and 2AGC functions cannot be used together. If one is used the other is automatically set to “0”.

03 °

1-7

Remote Control Box

elects which display unit to

ontrol in multiple display unit

stallation.

ises/lowers the transducer.

Raises transducer.

Mid protrusion

Full protrusion

Press to enter mark shown on key or shift screen center.

Selects display range.

Adjust receiver sensivity.

Trains the transducer automatically within a selected sector.

ts direction of the sounding am center between 165ß port d 165ß starboard.

EVENT

ESTIMATE

FISH

–

RANGE

DISP SELECT

FUNCTION

SHOOT

TGT LOCK

NET COURSE

OFFCENT

234

–

GAIN

AUTO

TRAIN

TGT SLICE

AUTO

VERT SCAN

DATA

MEMO

RECALL

TILT

SCAN DEPTH

Each press displays water temperature or depth at screen center for about five seconds.

Turns on transmitter. Press this key for more than one second for stable operation.

Shifts trackball mark.

1-3: Same as 1-3 on main panel. 4-5: Same as - and + on main pan

Displays net shooting mark.

Saves picture to memory card.

Not used.

Replays a stored picture.

Automatically tillts sounding beam in 2¡ steps within sector selected by WIDTH key.

Varies the tilt angle of the sounding beam between 0¡ and 90¡.

Not used.

1-8

Figure 1-5 Remote control box

OPERATIONAL OVERVIEW

CAUTION

Do not exceed speed noted in the specifications when operating the equipment or lowering or raising the transducer.

The transducer may become damaged.

Do not press the c switch during lowering of the transducer, and do not press the

or d switch during raising

of the transducer.

The equipment may become damaged.

Turning the Power On/Off

Turning the power on

Press the ON key on the main panel. The lamp above the key should light. If it doesn’t press the TX switch on sub panel 1.

Turning the power off

Retract the transducer with the c key and then press the OFF key on the main panel.

Note: The transducer is automatically retracted into the tank even if the OFF key is pressed before retracting the transducer . However, make it a habit to retract the transducer before turning off the power.

Adjusting Screen Brilliance, Control Panel Backlighting

The BRILL control adjusts screen brilliance, and the DIM control adjusts control panel backlighting. These controls are on the lower part of the main panel.

Lowering the Transducer

Press d(full) or d(mid) key. The lamp above the key blinks during lowering of the transducer and lights when the transducer is completely lowered. In normal use fully lower the transducer . The transducer extends 1200 mm* below the ship’s hull, providing stable and cavitation-free soundings. If the transducer may become entangled in the net, after shooting the net, for example, partially raise the transducer with the This raises the transducer by 400 mm (transducer extends 800 mm* from ship’s hull).

d(mid) key.

*: Hull unit with 800 mm (full) and 450 mm

(mid) protrusion is also available.

2-1

Selecting a Display Mode

The CSH-73 provides three display modes: normal sonar picture, echo sounder (E/S) combination, and history display combination. Those modes may be selected with the NORM, E/S and HIST keys.

Table 2-1 Display mode description

Mode Description

The sonar picture appears over the entire screen. This mode is useful for detecting and tracking fish schools. The default display area is 1.3 times the range, but it can be changed to

1.6 times the range on "EXT KP/TM DSP" in the SYSTEM menu. Navigation information can be displayed in the text window at the screen bottom by turning on

NORMAL

"DATA DISPLAY" in the user menu.

Text window

E/S

Normal scanning picture appears on the upper 5/8 of the screen and the signal fed from the echo sounder on the lower 3/8. This mode is suitable for judging fish school concentration. When two echo sounders are connected, each pressing of the E/S key alternately selects echo sounder 1 or echo sounder 2. Note that a net recorder can be connected as echo sounder 2; select it on the "ES" sub menu in the INIT SET/TEST menu.

Normal scanning sonar picture appears on the upper 5/8 of the screen and the history display on the lower 3/8. Two types of history displays are available: Audio and Port/Starboard. You can select which one to display on the USER menu.

2-2

HISTORY

Selecting a Display Range

Operate the RANGE control to select a display range. The range selected appears at the top center of the screen.

Setting the T ilt 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 zero degrees and when emitted vertically, 90 degrees.

To set a tilt angle, operate the TILT lever. W atch the tilt angle indication at the top right

R400 T 15

Tilt angle

corner on the screen. The tilt angle can be set in one-degree steps from 0 to 90 degrees.

Finding a proper tilt angle is important when searching for fish. The beam of the half-circle scanning sonar is fan shaped as in

(A) below and it swings up and down according to the setting of the TILT lever. If you look at the angle between the horizontal plane (sea surface) and several points on the beam, it can be seen that the angle is maximum in the center of the beam (q) and becomes smaller as it goes toward the edge, finally becoming zero degrees at the edge of the beam. This will be more clearly understood if you look at a vertically directed beam. See (B) below. You should keep in mind that the tilt angle displayed on the screen is the angle the center of the beam forms with the horizontal plane.

(A) (B)

Figure 2-1 Tilt angle

SEA SURFACE

2-3

Adjusting the Gain

The GAIN control adjusts receiver sensitivity (gain). Adjust it so fish echoes are clearly displayed with minimal noise on the screen. Too high a setting not only displays excess noise and makes it difficult to discriminate wanted echoes but also causes seabed echoes to be painted in strong colors, resulting in echoes being masked by seabed reflections. Normally, set the control somewhere between positions “3” and “7”.

Gain low

Gain proper Gain high

Figure 2-2 Gain settings and resulting pictures

Measuring Range and Bearing to a Target

Operate the trackball to place the trackball mark on the target you want to measure the range and bearing. The range and bearing appear at the upper left corner on the screen.

Figure 2-3 Location of range and bearing indications

2-4

Note: The bearing is shown in either 360° or 180° indication relative to ship’s heading. In the latter case, bearing (“B”) is indicated as follows:

B P ------- on the port side B S ------- on the starboard side

FINE TUNING THE PICTURE

This chapter provides the information necessary for tuning the sonar picture. All operations are performed on sub panel 2 (data setting window).

Sub Panel 2

Figure 3-1 Display unit

Eliminating Unwanted Feeble Echoes

Echoes from targets such as seabed and fish return to the transducer in order of distance to them, and when we compare their intensities 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 can not judge the actual size of the target from the size of echoes displayed on the screen. T o overcome this inconvenience, the TVG function is incorporated. 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 the similar intensities irrespective of the ranges to them.

The CSH-73 has three TVG functions, NEAR, MEDIUM and F AR, and they mainly compensate for propagation loss on short, middle and long ranges respectively , centered at the ranges shown in the figure on the next page. The higher the TVG setting the greater the amplification of echoes.

3-1

Near

25 m

Med

100 m

Far

400 m

Figure 3-2 Principle of TVG

The TVG is also used to suppress unwanted echoes and noise which appear in a certain range area on the screen such as sea surface reflections and cruising noise. To set TVG properly, do the following:

How to adjust TVG

1. Open sub panel 2.

2. Select TVG•TX.

3. Set TVG NEAR, MEDIUM and FAR to 5 (default setting). There setting are useful for almost cases.

4. When sea surface reflections or plankton layers disturb the picture, decrease appropriate TVG option by one or two steps by pressing – (minus) key.

5. Locate fish school on a long range setting (about 800 meters) which is approaching own ship.

6. Adjust the tilt to keep the fish school in the center of the sonar beam, namely, fish school is displayed in strongest colors possible. Confirm that the fish echo is displayed in the same color as it approaches. If the color suddenly changes to weaker colors as the fish enters MEDIUM and NEAR areas, the TVG is improperly set. Adjust the TVG. If this produces sea surface reflections and noise try to remove them with AGC and NL controls.

Note: If the above procedure does not produce satisfactory results, the TVG curve can be changed on the SYSTEM menu. The 25 log setting is useful for searching fish schools near shorelines or shallow waters.

3-2

Suppressing Seabed Tail

AGC (data setting window: SIGNAL, SIGNAL PROCESS)

The AGC functions to automatically reduce the receiver gain only against strong echoes such as the seabed or a large fish school. Since weak echoes remain unaffected, a small fish school becomes easier to detect. Adjust it so that the AGC works only on seabed reflections. Do not set it too high; weak echoes may be missed.

Pulselength (data setting window: TVG•TX, PL)

The pulselength control determines the length of the transmission pulse emitted into the water. While a longer pulse is advantageous for long range sounding, it has the disadvantage of being poor in discrimination of targets, that is, ability to separate several closely located targets. When searching bottom fish, therefore, it is useful to shorten the pulselength in order to separate fish echoes from seabed reflections. Decrease the PULSELENGTH setting to shorten the pulselength. For search of surface and midwater fish in which seabed reflections are not so strong, use the longest pulselength “10”.

2AGC (data setting window: SIGNAL, SIGNAL PROCESS)

While it is ideal to suppress seabed echoes with the AGC control alone there are some fishing grounds where this is not possible. (The high power sonar has the advantage of long-range detection but this can also be a disadvantage, since weaker echoes may be hidden in strong, unwanted echoes such as the seabed.)

If you cannot suppress seabed echoes or sea surface reflections by the AGC control alone, use the 2AGC control. Normally a setting of 2 or 3 is suitable. For especially strong echoes, use a setting of 4 or 5.

AR, -4 to 1: Adjusts horizontal beamwidth

2AGC function is fixed at “3”. 0: 2AGC function is off. 1 to 5: Larger the number, the greater the effect of

2AGC.

3-3

Suppressing Seabed and Sea Surface Reflections in Shallow Waters

Data setting window: TVG•TX, OUTPUT

In shallow fishing grounds with hard or rocky bottom, seabed reflections often interfere with wanted fish echoes and they can not be eliminated sufficiently with the aforementioned TVG and AGC controls, especially when the TILT is set to a larger angle in order to track fish schools approaching within 400 m. In such cases try to reduce the output power by adjusting the OUTPUT control instead of turning down the gain. The picture becomes clearer when output power is reduced rather than when the GAIN is decreased as illustrated below .

WRONG METHOD

CORRECT METHOD

Fish echo

TVG and AGC adjusted with OUTPUT kept high

OUTPUT decreased with GAIN kept constant

Seabed echo False seabed echo

Surface echo

Fish echo

Figure 3-3 How to suppress seabed and sea surface reflections in shallow waters

Rejecting Sonar Interference and Noise

While observing the sonar picture, you may encounter occasional or intermittent noise and interference. These are mostly caused by on-board electronic equipment, engine or propeller noise, or electrical noise from other sonars being operated nearby.

3-4

Interference from other sonar

Cruising (propeller) noise of own ship

Cruising noise from other boat

Figure 3-4 Forms of interference

Identifying noise source

T o eliminate noise effectively , you should first identify the noise source as follows:

1. Turn off the TX switch and operate all on-board equipment

one by one while observing the picture.

2. Run the boat at various speeds to check if the noise is speed

dependent.

If neither of the above two steps has effect on the picture, adjust one of the following:

Interference rejector (data setting window: SIGNAL, SIGNAL PROCESS)

This control is similar to the interference rejector on echo sounders and radars. It is effective for rejecting random noise and sea surface reflections in rough sea conditions. Set it so that noise is just eliminated. Do not use an unnecessarily high setting since it may also reject small wanted echoes.

Changing Tx cycle (data setting window: TVG•TX, CYCLE)

When other sonars operate nearby at the same transmission interval as that of own ship’s sonar , an interference ring caused by other sonars is displayed. T o erase the interference ring from the screen, reduce the CYCLE on the data setting window.

3-5

Interference

Figure 3-5 How CYCLE works

Note: When the sonar is used in shallow water with the range set between 60 m and 200 m and Tx cycle at “9”, seabed reflections caused by the 2nd-to-the-last transmission may appear on near ranges. Reduce the Tx cycle setting to “2” or “3” to suppress them.

Setting F-shift (data setting window: SONR•BEAM, SONAR)

If interference cannot be suppressed by the interference rejector (IR) or Tx cycle, change the setting of F-SHFT from 1 to 2.

Noise limiter (data setting window: SIGNAL, SIGNAL PROCESS)

W eak, unwanted reflections, colored light-blue or green, appear when the water is dirty, plankton layers exists, or due to ship’s noise. The noise limiter (NL) can reduce the effects of these unwanted reflections–raising the setting causes them to become bluish to background color . Normally a setting of 3 or 4 is sufficient.

3-6

Adjusting Beamwidth

Beamwidth can be adjusted at SONR•BEAM, BEAM on the data setting window .

Table 3-1 Beamwidth adjustment menus

Menu Application

HOR

Set to "0" for normal use. The higher the setting the narrower the beam. This control may be used together with the AGC and NL controls to suppress sea surface reflections and seabed echoes.

3-7

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MARKS AND DATA

Marks, Data and Display Mode

Normal display mode

Figure 4-1 Marks and data appearing in the normal display mode

4-1

Normal display mode w/text

Figure 4-2 Marks and data appearing in the normal display mode w/text

Echo sounder combination display

4-2

Figure 4-3 Marks and data appearing in the echo sounder conbination display mode

History display

Figure 4-4 Marks and data appearing in the history display mode

Permanently Displayed Marks and Data

Mark/Data Description

Trackball Data

→

B ˚

Range Data

Trackball data:

→

: Slant range

: Horizontal range

: Depth B : Bearing

Bearing is shown in 360° or ±180° indication system, relative to ship's heading. In the latter case, "B" is indicated as follows:

B P B S

.... on the port side

.... on the starboard side

Shows the range scale set with the RANGE control.

*Requires external sensor.

Tilt Angle Data

T ˚

( )

Train Angle Data

(Continued on next page)

The tilt angle appears below the range. The tilt angle can be changed in 1° steps within the range of 0° to 90°. In target lock* and automatic tilt control, the instantaneous tilt angle appears in parentheses. Accordingly, both are equal when target lock is on. In automatic tilt, the upper indication shows the tilt angle set by the TILT lever and the lower indication the instantaneous tilt angle at which the sonar actually works.

The train angle data shows the direction of sonar beam center set with the TRAIN lever.

4-3

Mark/Data Description

Own Ship's Mark

Shows own ship's present position. The direction of the arrow shows ship's heading. This mark moves with ship's movement in the true motion mode*. On all other modes it is fixed at the screen center.

North Mark* (or Heading Mark)

When the CSH-73 is connected to a gyrocompass the mark is called the north mark and points North. If there is no gyrocompass input it is the heading mark and points in the direction of own ship's heading.

Heading Data

This data requires gyrocompass input. Bearing is displayed in 32-azimuth (N, N/E, etc.). Bearing can also be displayed in figures (for example, "360") by calling up the SYSTEM menu and selecting BRG READOUT-Course.

Trackball Mark

Sets own ship's mark location for off-center display; sets location for mark input. The trackball (or arrow keys on the remote control box) controls this mark.

Erasable Marks and Data

Mark/Data Description

Latest Event Mark

These marks depict important locations. With speed log and gyrocompass connection these marks follow ship's movement. In the true motion mode* they are stationary. Ten marks, one latest and nine event marks, can be displayed. When more than ten marks are entered the

Event Mark

Latest Event Mark Data

oldest is erased to make room for the latest.

The position data of the latest event mark, that is, horizontal range (→ current depth

(↓) and bearing. ( ) shows the latest event mark's

original depth, and remains unchanged regardless of ship's movement or tilt angle. When the event mark is erased the above data disappears

from the screen. To erase an event mark, place the trackball mark on the event mark

( )

B ˚

and press the EVENT key.

(Continued on next page)

4-4

Range Rings

The range rings are inscribed at intervals of 1/4 of the range in use. Range ring data is also provided every two range rings. The range ring interval can be changed from 1/4 to 1/2 through the menu.

Mark/Data Description

Latest Fish Mark

Fish Speed Mark

Fish Mark

These marks are inscribed on the screen by pressing the FISH key. Ten fish marks can be displayed. Each time the key is pressed the fish marks change on the screen as follows:

1st press of FISH key 2nd press of FISH key 3rd press of FISH key 4th press of FISH key

Fish Movement

C S .

Fish movement from the fish speed mark ( ) to the latest fish marker ( ) is shown by distance, course (C) and speed (S) at the lower right corner of the screen.

Range and Bearing Mark Data

B ˚ R

These marks are used for monitoring echoes through the loudspeaker and also for displaying horizontal slice picture. If the target lock function* is on the bearing marks follow the movement of the target lock mark.

This data appears when the bearing and range marks are displayed.

Bearing and Range Marks

Bearing marker

Range marker

The heading mark is drawn with a dotted line. Heading mark* data appears at the top of the screen.

Heading Mark

100 200

Electronic Bearing Scale

The electronic bearing scale is available with gyrocompass connection. It rotates with own ship's movement.

(Continued on next page)

4-5

Mark Description

Ship's Track Mark*

With gyrocompass or speed log connection, own ship's track is plotted by a solid line. The track length to display can be selected among 5, 10, 20 and 40 times the range.When the length of the line exceeds selected value the oldest part of the track is erased.

Tidal Current Mark*

This mark can be displayed with current indicator input. The tidal

current marks are displayed on the net shooting mark ( ) and net sondemarks ( ). The tidal current marks show tidal current speed in three layers (1–3) selected on the current indicator. The tidal

Tidal Current Data Normal mode

C1: . ˚ M

C2: . ˚ M

C3: . ˚ M

Combination mode

C1: .

C2: .

C3: .

current speed is shown by the length of the current mark. Note however that no tidal current mark appears if the tidal current speed is less than

0.2 kts. Current direction can be shown as "to" or "from" by selecting CURRENT VEC-Current Flow Dir on the USER menu. In the normal mode with text, speed, direction and depth of the current are shown for three layers (C1, C2, C3). In the echo sounder and history modes, only the speed appears (C1, C2, C3), on the echo sounder or history display.

Net Sonde Data* When the net sonde is connected, the depth of the net sonde trans-

S1:

S2:

S3:

mitters appears in the text window, echo sounder, or audio area.

Nav Data*

S : .

C :

D : M T : .

Own Ship Data*

˚ . N ˚ . E

Estimate Mark

Estimate mark data

(Continued on next page)

With appropriate sensors speed (S), course (C), water depth (D) and water temperature (T) can be displayed on the text window, echo sounder combination display and history display.

With navigation input position can be displayed in latitude and longitude, in the normal mode only.

The estimate mark gives relative fish quantity. Press the ESTIMATE key. The estimate mark data appears below the mark. The fish amount is assessed as between 0 and 100, where if the mark is filled with the strongest echo color reddish brown, the amount is regarded as "100." The size of the estimate mark can be changed with MARK SIZE2Estimate Mark on the SYSTEM menu.

4-6

Mark Description

Target Lock Mark* The target lock mark automatically tracks the fish school selected

by the operator. This function requires speed and gyrocompass inputs.

Net Shooting Mark

Net Shooting Data

Press the SHOOT key at the instant you shoot the net to display the net shooting mark on the display. The net shooting mark is drawn at own ship's position the moment the key is pressed and moves on the own ship's track mark with ship's movement. In addition to the mark, time elapsed and distance run* (in meters) appear from the time the key is pressed. The mark and its data remain on the screen until the SHOOT key is pressed again.

Net Sonde Mark*

(10 pts. max)

These marks appear on the ship's track mark* in order at set intervals, when a net sonde is connected. In the echo sounder combination mode they also appear in the echo sounder picture, showing depth of the net sonde transmitters with bars extending from the marks.

E/S Picture Advance Range Data

z , / /

Picture advance on the echo sounder combination mode automatically changes to ship's speed dependent (advance) rate from the moment the SHOOT key is pressed, provided there is speed log input. The E/S picture advance range data shows the distance between the right and left edges of the echo sounder picture window in the ship's speed dependent advance. Since the net length plus wire length set on the DATA SET menu is used as this distance data, the echograms obtained during casting the net are displayed just across the E/S window. Set net length and wire length on NET SONDE in the DATA SET menu.

Control Setting

When the switches listed below are operated the new setting is noted at the top of the screen in larger characters for five seconds. The auto tilt width and auto scan width also appear upon turning on the AUTO TILT and AUTO SCAN functions.

Control, Display Control, Display

RANGE R TILT T GAIN G TVG TVG TX TX

AUTO TILT ± AUTO SCAN ± BRILL DIM TRAIN R0

Color Bar

The 16-color bar appears at the right-hand edge in the echo sounder and history displays.

E/S Range Scale

The range scale for the echo sounder picture appears in the echo sounder combination mode. You can display it on the right or left side of the screen by selecting ES/NET REC on the INIT SET/TEST menu.

4-7

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USER MENU OVERVIEW

Many functions are carried out through the menu system, which consists of the USER, SYSTEM, DA T A SET and INITIAL SET/ DATA menus. The menu you will use most often is the USER menu.

Menu How to open

USER Press MENU. SYSTEM

DATA SET

INIT SET/TEST

The SYSTEM menu, DATA SET menu and INIT SET/TEST menu are for use by service technicians. See page 16-1 for details.

USER Menu Operation

The menu operating procedure is the same for all types of menus. Below is the basic menu operating procedure for the USER menu.

1. Press the MENU key to open the USER menu.

Press c and MENU together. Press d and MENU together.

Press MENU and ON. (Press and hold down until the buzzer sounds. All LEDs light while keys are held down.)

USER MENU

Select item with dc[ \ keys and press MENU key. Press END key to close menu.

CARD UTILITY

DATA DISPLAY

CURRENT VEC

CARD ECHO DAT

MARK DSP 1

SAVE PICTURE

CARD NET DATA

MARK DSP 2

Figure 5-1 USER menu

FUNCTION KEY

HIST DSP/GRPH

5-1

2. Operate the arrow keys in sub panel 1 to select a menu. As you move through the menu, each item, initially shown as blue on gray , reverses to gray on blue to show selection. For example, select the HIST DSP/GRPH menu.

3. Press the MENU key to display menu selected.

USER MENU

Select item with dc[ \ keys and press MENU key. Press END key to close menu.

HIST Window DSP

Fish Histogram

HIST DSP/GRPH

AUDIO

PRT/STBD

OFF

H-Slice

Figure 5-2 HIST DSP/GRPH menu

4. Operate the up and down arrow keys in sub panel 1 to select menu item, and the right and left arrow keys to select option.

5. Press the END key to close the menu. Press the key again to display picture.

Note: The HELP key provides menu operating information.

Menu screen location and display mode

Menu screen location depends on display mode as shown in the figure below.

Normal Mode

ES Mode

Figure 5-3 Menu screen location and display mode

5-2

USER Menu Description

Table 5-1 User menu description

Menu Menu Item Description

List Lists contents of memory card.

CARD UTILITY

CARD ECHO DAT

CARD NET DATA

FUNCTION KEY

DATA DISPLAY

MARK DSP 1

Save Saves control and menu settings to memory card. Delete Deletes data from memory card. Initialize Formats memory card. Save Saves echo inside estimate mark (stored in internal

memory by MEMO key) to memory card.

Save Saves net shooting data (stored in internal memory)

to memory card.

mode, TX ON/OFF, user menu, system menu, and data set menu to function key.

Event Mark 1 Event Mark 2 Fish Mark On Track Data Text Window ES Window

Range/Bearing Heading Mark Range Rings Bearing Scale Auto Scan Width Auto Train Width

Turns those marks on/off. "ES Window" selects tidal current data or net sonde data, which are displayed on the ES combination display while shooting the net.

Turns those marks on/off. Note that turning off Range/Bearing mark also turns off the data display.

MARK DSP 2

HIST DISP/GRPH

(Continued on next page)

Ship's Track Net Movement Plot Fish MK Connect Fish Tracking MK Fish Track Plot

HIST Window Dsp

Fish Histogram Turns on/off echo intensity distribution for echoes

Turns those marks on/off.

Chooses type of display for HIST window: AUDIO: Displays echoes within audio sector. H-Slice: Displays echoes along upper half of range mark.

inside estimate mark on the target slice display.

5-3

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5-4

FUNCTION KEYS

Similar to the quick dialing function on a telephone, the five function keys (F1–F3) on the main panel record control and menu settings and replay them back exactly as programmed. The items you can program are gain, display mode, TX ON/OFF, USER menu, SYSTEM menu, DAT A SET menus and data setting window. The function keys are useful for quickly setting up the sonar for a specific purpose such as seabed detection.

Programming the Function Keys

1. Tune the sonar as desired.

2. Press the MENU key.

3. Select the FUNCTION KEY menu and press the MENU key .

USER MENU

Figure 6-1 FUNCTION KEY menu

4. Press the MENU key again.

FUNCTION KEY

ExecuteRegister

6-1

USER MENU

Customized settings are registered to FUNCTION keys. Select key number with↑ ↓ key and press MENU key. Press END key to return to sub menu.

Figure 6-2 REGISTER menu

5. Press the up or down arrow key in the sub panel 1 to select the function key to program, then press the MENU key.

6. Press the END key several times to close the menu.

Replaying a Function Key

Press function key (F1–F3) desired.

FUNCTION KEY

Function Key Fine Tuning

The function key fine tuning keys ([+], [-]) let you fine tune the items shown in the table on the next page when a function key is active.

Note: Register function keys beforehand to use this function.

1. Press desired function key. The lamp above the function key pressed lights.

2. Press the [-] or [+] key as appropriate; the [-] key to lower the setting to de-emphasize echoes, and the [+] key to raise the setting to emphasize echoes.

The lamp above the [-] key lights when the setting is -1 to -4, and the lamp above the [+] key lights when the setting is 1-5.

6-2

Fine Adjustment Item

TVG Near -3 -2 -1 0 0 1 1 2 3 4

TVG Mid -3 -2 -1 0 0 0 1 1 2 3

TVG Far -3 -2 -1 0 0 0 0 1 1 2

Tx Cycle 0 0 0 0 0 0 0 0 0 0

Tx Beamwidth -3 -2 -1 0 0 0 0 0 0 0

Tx Power -2 -1 0 0 0 0 0 0 0 0

-4 -3 -2 -1 0 1 2 3 4 5

Function Key Fine Tuning

Saving Function Key Settings to a Memory Card

1. Press the MENU key.

2. Select the CARD UTILITY menu.

CARD UTILITY Press END key to return to main menu.

List Execute Save Execute Delete Execute Initialize Execute

Figure 6-2 CARD UTILITY menu

3. Select Save and press the MENU key. Note: If the card has not been initialized, initialize the card by

selecting Initialize and then save.

Replaying Function Key Settings from a Memory Card

Press the CARD REPLAY key on sub panel 1. Note: When function key settings are replayed from a memory

card, current settings on all function keys are erased. Therefore, if necessary , save current function key settings to another memory card before replaying.

6-3

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ADVANCED LEVEL OPERATION

Finding Fish School Center

When you want to find the center depth of a fish school, use the auto tilt function, which automatically scans the tilt angle within the selected width.

Table 7-1 Automatic scan range at menu setting WIDE of OTHER sub menu in the INIT SET/TEST menu

Range (m) Width (1) Width (2) Width (3) Period

75, 100 150, 200 300, 400 500, 600

800

1000

more than 1200

10°

" "

8° 6° 4° 2°

16°

12°

8° 4°

20°

" " "

16° 12°

6°

every 6 transmissions every 4 transmissions every 2 transmissions

" " " "

For example, when the RANGE control, TIL T lever and WIDTH key are set to 800 m, 8° and width (1), respectively , the tilt angle varies at every transmission as follows:

8°→8°→10°→10°→12°→12°→14°→14°→12°→12°→10°→10°→ 8° →8°→ 6°→6°→4°→4°→2°→2°→4°→4°→6°→6°→8°→ 8°

Figure 7-1 Tilt angle setting

Table 7-2 Automatic scan range at menu setting NARROW of OTHER sub menu in the INIT SET/TEST menu

Range (m) Width (1) Width (2) Width (3)

75, 100 150, 200 300, 400 500, 600

800

1000

more than 1200

4° * 2° 1°

" " " "

6° * 4° * 2°

" " " "

8° * 6° * 4° * 3°

" " "

Note: Period: every transmission Tilt angle changes in 2° steps for asterisk-marked widths; 1° step for all other widths.

7-1

Tracking a Fish School (target lock)

T arget lock, which requires speed and heading inputs, automatically tracks an important fish school so that you wonít lose sight of it on the display screen. Two types of target lock are available: Target Mark or Fish. One may be selected on the SYSTEM menu.

Tracking a fish school

1. Operate the trackball to place the trackball mark on fish school you want to track.

2. Press the [TARGET LOCK] key to light the lamp above it. The target lock mark ( tracking begins.

ABCD

Depth

) appears on the fish school and

60° 60°

Figure 7-2 Target lock mark and target lock data

Note 1: Range offset is applied to both shipís movement and fish school movement on the screen. Tilt angle is not offset.

Note 2: When the target goes out of the tilt angle range the lamp above the [T ARGET LOCK] key blinks, and then target lock is cancelled.

3. To cancel target lock, press the [TARGET LOCK] key again.

7-2

Target lock mark appearance

The size and thickness of the target lock mark indicates fish speed and tracking status, as shown below.

Target lock mark appearance

Fast Medium Slow

(More than 5 Tx cycles) (Up to 3 Tx cycles)

Mark size indicates relative speed.

Mark thickness shows tracking status.

Meaning

Figure 7-3 Target lock mark appearance

Erasing target lock mark

Target lock marks may be erased as follows:

1. Open the sub panel 2.

2. Select DELETE MK.

3. Press the [+] key for DELETE MARK FISH.

Choosing target lock mode

Two types of target lock are available: target mark and fish. Target mark: Tracks the target lock mark, changing range and

tilt angle according to ship’ s movement. The fish school itself is not tracked.

Fish tracking: Tracks fish schoolís horizontal movement, changing range and tilt to track movement.

Do the following to select target lock type:

1. Open the sub panel 1.

2. Press the [MENU] key while pressing the up arrow key in sub panel 1 to display the SYSTEM menu.

3. Select TARGET LOCK, and then press the [MENU] key.

7-3

4. Select Tracking Method, and then press the [MENU] key.

5. Select method desired.

6. Press the [END] key several times to close the menu.

Tracking target lock mark

1. Operate the trackball to place the trackball mark on the fish school you want to track.

2. Press the [TARGET LOCK] key to light the lamp above it. The target lock mark (

) appears on the fish school and

tracking begins.

Tilt angle is automatically changed to keep the target lock mark location within the sonar beam.

3. To stop tracking, press the [TARGET LOCK] key again.

Note 1: If the target goes out of the picture or the tilt angle is greater than 60 degrees the lamp above the [TARGET LOCK] key flashes to call your attention.

Note 2: Target lock position and data are calculated according to tilt angle.

Note 3: The bearing mark moves to the target lock mark location when target lock becomes active. Bearing to the target lock mark is shown.

Note 4: T ar get lock is temporarily disabled when the distance to the tracked fish school is less then 40 m. It is resumed once the distance becomes more than 40 m.

Note 5: The target lock works up to a tilt angle of 60 degrees. In the drawing below, the tilt angle is fixed at 60 degrees between B and C. During this period, however, calculation is continuously being performed. When own ship comes to point C, target lock is resumed.

ABCD

60° 60°

Depth

7-4

Figure 7-4 Target lock and tilt angle

Setting target lock conditions

1. Open the sub panel 1.

2. Press the [MENU] key while pressing and holding down the down arrow key in sub panel 1.

3. Select TARGET LOCK with the arrow keys.

4. Press the [MENU] key.

SYSTEM MENU

TARGET LOCK

Select item with ↑ ↓ ← → keys and press MENU key. Press END key to close menu.

Tracking Method TGT Mark Fish

Track Echo Color

Fish Speed Limit 5kt

Fish Track Window

Fish Spd Update

Target LK Window

Setting range: 1 to 10

Setting range: 1 to 15 Setting range: 2 to 20

10m

15 sec 30 sec 45 sec 60 sec

Normal Large Largest

Auto

Figure 7-5 Target lock menu

5. Press the up or down arrow key to choose item; right or left arrow key to set option.

Setting

Choose weakest echo to track.

Set fish speed which cancels target lock.

Set distance at which to trace fish school track.

Choose update interval for fish speed readout.

Choose size of target track window (not shown).

6. Press the [END] key several times to close the menu.

7-5

Description of target lock items

TrackingMethod Sets target lock function: target lock mark, fish or automatic.

Track Echo Color Sets minimum echo signal level to track. A fish school whose

signal level is above the level set here is tracked. Fish Speed Limit Sets fish speed at which target lock is cancelled. Fish Track Window Set distance at which to track fish schoolís track when it exits

the tracking window. Fish Speed Update Selects update interval of fish speed readout; 5,10, 20 or 30 sec-

onds. Target Lock Window Sets size of target lock window. The window itself is not show

on the display. NORMAL: 32 x 32

LARGE: 64 x 64 LARGEST: 128 x 128

7-6

Detecting Fish Schools Aurally

Sometimes you may 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 seabed through the built-in speaker.

After you’ve become accustomed to monitoring fish aurally , 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 school is approaching or going away; the tone becomes higher when the school is approaching and lowers when the school is going away.

1. Operate the trackball to place the trackball mark to the direction you want to monitor through the speaker.

2. Press the R/B key. The bearing mark appears on the display. Echoes in a 30°, 60°, 90°, 180° or 330° sector centering the bearing mark are monitored through the speaker. You can adjust speaker volume with the AUDIO control.

3. To change coverage area, open the data setting window (sub panel 2) and change width of AUDIO SECTOR.

4. To scan the coverage area, open the data setting window, turn on AUTO SCAN and set scanning WIDTH.

Note: You can display the signal monitored through the loudspeaker on the history display combination window by pressing the HIST key, if AUDIO is selected on the HIST Window DSP menu in the USER menu.

7-7

The Fish Alarm

The fish alarm sounds an audible alarm when a fish echo above a preset strength enters an alarm zone. You set parameters for the fish alarm at ALM on the data setting window.

ON/OFF: Turn alarm on or off. Level: Set echo strength level which will activate the alarm. Zone: Set alarm zone.

1. Open the data setting window and select ALM•AUDIO.

2. Press the + key of the ZONE item.

3. Operate the trackball to place the trackball mark on the starting point of the alarm zone.

4. Press the + key.

5. Rotate trackball clockwise to select the end point. The display paints a fan-shaped alarm zone.

6. Press the + key.

Starting

point

End

point

Alarm zone

Figure 7-6 How to set the fish alarm zone

Note: There must be at least three degrees difference between the starting and end points to get a fan-shaped alarm zone as shown in (a) and (b). Otherwise, the unit paints a 360 degree alarm zone as in (c) and (d).

More than 3°

Within 3°

7-8

(a) (b) (c) (d)

Relocating Fish School for Easy Observation

Own ship mark

Place trackball mark here, for example.

Press the OFF-CENT key.

Fish school

Own ship mark moves to trackball mark position.

1. Operate the trackball to place the trackball mark on the position where you want to relocate the own ship mark.

2. Press the OFF-CENT key.

3. To move the own ship mark back to the screen center, press the OFF-CENT key again.

Figure 7-7 How to relocate fish schools

7-9

Comparing of Fish School Concentration

You can get an estimate of the volume of two fish schools by using the two ESTIMATE keys.

1. Operate the trackball to place the trackball mark on a fish school, and then press the ESTIMATE 1 key.

The estimate mark appears on the fish school. Relative volume is shown by a figure between 0 and 100, below the estimate mark. When inside the mark is filled with reddish brown, volume figure is “100”.

2. Operate the trackball to place the trackball mark on another fish school and press the ESTIMATE 2 key .

3. Compare estimate figures for each fish school.

4. To turn off the estimate marks press their respective keys.

Estimate mark 2

Estimate mark 2 data

Estimate mark 1

Estimate mark 1 data

Figure 7-8 Estimate marks and their data

7-10

Measuring Fish School Speed

To ensure a good haul, it is important to estimate the direction and speed of the fish school before shooting the net. You can do this with the FISH key. If the tidal current data is used together with fish speed data, you can determine the timing of the net shooting more efficiently . This function requires speed and heading inputs.

1. Place the trackball mark on the center of a fish school, and then press the FISH key . The latest fish mark ( the fish school.

2. Wait 1 to 2 minutes.

3. Place the trackball mark on the same fish school selected in step 1 and press the FISH key. The latest fish mark ( pears on the target and the 2nd latest fish mark ( on the location selected at step 1. At the bottom left corner of the screen, the distance between the two fish marks, and fish school course and speed appear .

) appears on

) ap-

) appears

Latest fish mark

4. If you want to delete fish marks and fish speed marks, open data setting window , select DELETE MK and then press the FISH key.

Latest fish mark

Fish movement

Figure 7-9 How to measure fish speed

Note 1: Movement is calculated using ship’ s speed and bearing inputs. Accordingly , pitching and rolling may affect the calculation. For better results, try the procedure two or three times to verify reliability.

Note 2: The time and distance between pressings of the FISH key should be as long as possible to increase accuracy of measurement. For more accurate measurement repeat the procedure two or three times.

7-11

Note 3: Each time the FISH key is pressed the latest fish mark and ship’s speed mark change in the sequence shown below:

Fish key pressed once:

↓

Fish key pressed twice:

→

The Event Mark

Fish key pressed three times:

Fish key pressed four times:

↓

→

↓

→

The event mark is useful for finding the horizontal range, depth and bearing to a location some distance from current position. This function requires speed and heading inputs.

There are two types of event marks: event mark 1 and event mark 2. 10 of each type of mark can be displayed. The unit marks the latest one by (

) for event mark 1 and by ( ) for event mark

2. Older event marks are displayed by a cross plus event number (event mark 1) or an inverted Y with event number (event mark

2). When you enter more than ten event marks, the unit erases the oldest mark, one by one.

1 2

Latest

Figure 7-10 Event marks

2 3

7-12

Entering an event mark

1. Set the trackball mark where you want to place an event mark (latest event mark).

2. Press an EVENT key. The horizontal range, depth and bear ing to the event mark appear at the bottom left corner of the screen.

→234: Horizontal range (m) from own ship mark ↓19: Present depth (m) to mark

(35): Depth (m) of mark at moment EVENT key is pressed. B265: Present bearing (degree)

Bottom left-hand corner of screen

(35)

Stored when EVENT key is pressed.

You observe picture from direction of mark.

Figure 7-11 Event mark description

Plotting an event mark on the display is equivalent to dropping a buoy with an anchoring chain that extends from surface to bottom. The buoy is fixed at its present geographical location, but the marker on the display moves to a point where present beam plane intersects the anchor chain of the buoy as the ship moves or the tilt angle is changed. This can be said of other marks as well such as fish mark and trackball mark.

Erasing an event mark

Open the data setting window (sub panel 2) and select DELETE MK. Press appropriate EVENT key to erase mark.

7-13

True Motion Display

The relative motion display places the own ship mark at the screen center, and echoes from fish and the seabed move on the screen relative to own ship’s movement. This means that even when the ship is dead in water, fish echoes move on the display.

In the true motion display , however , stationary objects are fixed and own ship and fish echoes move on the display in accordance with their true courses and speeds. Thus you can observe own ship and fish echo movement with respect to the seabed.

Open the data setting window and select SONR•BEAM. Set UP/ TM in the SONAR menu to TM. This function requires speed and heading inputs.

Although the true motion mode is available for use in all modes, use in the combination mode is not recommended since the own ship mark may move into the combination picture area.

7-14

Figure 7-12 True motion display

Plotting Net Location Mark

Before shooting net, you will decide the shoot timing considering the water current direction, distance to fish school and moving direction of the fish school. Use the net location mark as a guide to decide the timing.

This function requires speed and heading inputs.

1. Place the trackball mark on fish school to be caught.

2. Press the NET COURSE key. The net location mark is depicted by dotted ring with a diameter equivalent to that of your purse seine net, being centered on the trackball mark.

Trackball mark

Net location mark

Figure 7-13 Net location mark

3. T o adjust the location of net location mark, move the trackball mark.

4. When the location is finalized, press the NET COURSE key again. The dotted ring is replaced by solid ring and the lamp above the NET COURSE key lights.

5. To erase the mark, press the NET COURSE key again.

You can adjust the diameter of the net location mark on NET SHOOT PLAN in the DATA SET menu.

7-15

Setting Distances Between Net Sonde Transmitters

DATA SET MENU NET SONDE NET SONDE XMTR

Select item with dc[ \ keys and press MENU key. Press END key to close menu.

Qty

Distance 0

: : :

: :

t Setting range: 0 to 10 s

t Setting range: 0m to 9990m s

T o accurately display the net shooting mark and net sonde mark position, the distance between transmitters must be correctly set. This is done on the DATA SET menu.

R0: Length of net from its end to transmitter1 in meters. R1: Length of net between transmitters 1 and 2 in meters.

R2: Length of net between transmitters 2 and 3 in meters.

Figure 7-14 How to measure distances between transmitters

How to set net sonde transmitter distances

1. Press the MENU key while pressing and holding down The DATA SET menu appears.

7-16

Figure 7-15 DATA SET menu

2. Select NET SONDE and then “Net Sonde XMTR”.

3. Enter number of net sonde transmitters and their distances between them

Observing Net Behavior

With net sonde connection you can observe net behavior after the throwing of the net, on the echo sounder combination mode. Accurate depiction of net sonde position depends on proper setting of the distances between net sonde transmitters. You can set those distances on NET SONDE XMTR in the DATA SET menu.

This function requires speed and heading inputs.

1. Press the SHOOT key just upon throwing the net into the water.

Then, the net shooting mark ( mark and also at the right edge of the echo sounder picture. Afterwards, whenever a net sonde transmitter on the net is thrown into water, a net sonde mark appears on own ship mark and moves with ship movement. The depths of net sonde transmitter units are digitally displayed at the lower left of the screen after the receiving transducer is placed into water . The net sonde marks appear also on the echo sounder picture as below , where the length of vertical line shows the depth of the net sonde transmitter unit.

2. To erase net sonde mark and associated data, press the SHOOT key again.

) appears at the own ship

Figure 7-16 Net behavior

7-17

Port/Starboard, Horizontal Slice Displays

The port/starboard display or horizontal slice display may be displayed by pressing the [HIST] key. The display shown depends on the setting of “HIST DSP/GRPH” in the USER menu.

Port/Starboard display

The port/starboard display takes echoes along the bearing (port, starboard) selected on the SYSTEM menu and displays them on the lower 1/3 of the screen. If the bearing width is set to 90 degrees, for example, the CSH-73 displays echoes in both port and starboard directions. The picture is scrolled vertically to downward.

↓

- - -

↓

Port/Starboard Sampling Angle

↓

- - -

Display Sector

Picture Advance Direction

Port Direction

Port/starboard sampling angle can be set between 0 and

180 degrees. Setting sequence: SYSTEM menu, HIST DISPLAY, PRT/STBD Sample.

Fixed at 6 degrees.

Figure 7-17 Port/starboard display

Starboard Direction

7-18

Horizontal slice display

120 degrees of the picture in the horizontal direction is shown for a given depth (D) in the horizontal slice window at the bottom of the display . The area to display may be selected with the [R/B] key.

↓

Range Mark

→

↓

Bearing Mark

Echo inside this area is shown in window

Horizontal Slice Width

Cross Cursor

Own Ship Mark

Figure 7-18 Horizontal slice display

1. In the normal display, place the trackball mark on the echo you want to see displayed in the horizontal display , then press the [R/B] key.

The horizontal slice marker, 120 δεγρεεσ in width and cen- tered on the bearing mark, appears on the display. Echoes within the marker appear in the window at the bottom of the display, scrolling leftward.

Picture Advance Direction

→

120 30 123 D22

→

↓

: Range from own ship to cross cursor in stern

direction.

: Range from own ship to cross cursor in port-

starboard direction. : Slant range from own ship to cross cursor. : Depth to cross cursor.

↓

120˚ (Fixed)

Range Mark Color Bar

Latest Picture

Own Ship Stern Mark

2. Place the trackball mark in the horizontal slice window to find data. The trackball mark changes to the cross cursor. Range and depth to the cross cursor are shown.

Note 1: Picture advancement is synchronized with ship’ s speed. The picture does not advance when the ship is dead in water or there is no speed input.

Note 2: The width of the horizontal slice marker may be changed on the SYSTEM menu with H-Slice Width.

7-19

Turning Marks, Data On/Off

You can turn marks and data on or off through the data setting window or the USER menu.

Turning marks on/off through the data setting window (Sub Panel 2)

Select DELETE MK to delete the following marks:

vent Mark Event Mark 2 Fish Mark

Each press of + or - deletes mark selected, one by one.

Own Ship Mark Ship's Track

Each press of + or - deletes 1/5 of overall length of track.

Turning marks on/off through the user menu

The following marks can be turned on/off thru the USER menu:

User Menu Display Item

DATA DISPLAY

MARK DSP 1

Event Mark 1

Event Mark 2 Fish Mark

On Track Data

Text Window ES Window

Range/Bearing Heading Mark

7-20

MARK DSP 2

CURRENT VEC

Range Rings Bearing Scale Auto Scan Width Auto Train Width

Ship's Track Net Movement Plot Fish MK Connect Fish Tracking MK

Fish Track Plot

w/Current Vec w/Current Vec w/Current Vec

SAVING, REPLAYING PICTURE

You can save either the whole screen or the echo inside the estimate mark to the internal memory or a memory card.

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Initializing Memory Cards

Before you save information to a memory card it must be initialized (formatted).

1. Press the MENU key to display the USER menu.

2. Select the CARD UTILITY menu.

3. Select Initialize. It takes more than two minutes to initialize a memory card.

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The memory card stores 256k bytes of data. This is equivalent to about two picture screens or about 20 pictures of echoes inside the estimate mark. The following data are automatically saved as system data when the memory card is initialized: panel setting, function key settings, and menu settings.

8-1

Saving the Picture

1. Press the MENU key to display the USER menu.

2. Select SAVE PICTURE.

3. Select item to save:

4. Press the END key to close the user menu.

5. Press the MEMO key on the main panel. It takes about two minutes to save a whole screen to a memory

card. During this time the normal picture is displayed but the unit accepts no key input.

Whole: Saves whole picture to memory card. Est MK: Saves echo inside the estimate mark to internal

memory . (About 20 pictures can be saved.)

QK Save: Saves whole screen to the internal memory . (One

picture can be saved.)

Transferring Echo Data from Internal Memory to Memory Card

1. Press the MENU key to display the USER menu.

2. Press arrow keys to select CARD ECHO DAT.

3. The display shows all inside-estimate mark pictures stored in the internal memory. Using the arrow keys select picture to save to memory card.

4. Press the MENU key. The lamp to the right of the memory card drive lights while picture data is being saved.

5. Press the END key several times to return to the USER menu.

8-2

Saving Net Shooting Data

How net shooting data is saved

The unit starts accumulating net shooting data when the SHOOT key is pressed. When net shooting is concluded by pressing the SHOOT key again, the echo inside the estimate mark and other net shooting data are saved to the internal memory. Note however that if ship’s movement between pressings of the SHOOT key is less than 1/3 of the net length the unit judges that net shooting is suspended and does not save net shooting data.

Transferring net shooting data to memory card

1. Press the MENU key.

2. Press arrow keys to select CARD NET DATA and press the MENU key.

3. If desired, according to on-screen instructions, select fish species to be added to net shooting data as a comment, and then press the MENU key.

4. If desired, enter fish quantity estimate by:

a) selecting number with up or down arrow key b) selecting place with right or left arrow key c) registering value by pressing the MENU key.

Net shooting data contents

Net shooting data is comprised of the following:

• Echoes inside estimate mark (the ones which are displayed

the first time the SHOOT key is pressed)

• Ship’s position, date, time

• Ship’s track, net movement, current direction, water depth

and/or water temperature

• Net sonde mark

8-3

Replaying Saved Data

Whole picture or echo inside estimate mark

1. Press the RECALL key (on the main panel).

2. Press the right or left arrow key in sub panel 1 to select item to replay. The left arrow key selects older data (for example, data in memory card); the right arrow key newer (for example, data in internal memory).

3. After viewing picture, press the RECALL key to escape.

Note that the priority order for replay of echo inside estimate mark is internal memory-saved picture followed by memory card contents.

Net shooting data

1. Press the NET REPLAY key (on sub panel 1).

2. At the screen bottom, comments are listed. Select the item to replay .

3. After viewing the data, press the NET REPLA Y key again to escape.

Deleting Memory Card Contents

You can delete unnecessary data from a memory card.

1. Press the MENU key to display the USER menu.

2. Select the CARD UTILITY and press the MENU key.

3. Select the DELETE and press the MENU key . The card contents are listed at the screen bottom.

4. Select data to delete.

5. Press the MENU key.

6. Press the END key a few times to close the menu.

8-4

INTERPRETING THE DISPLAY

Seabed Echoes

When the tilt angle is set at 90 degrees with the sector center faced dead ahead, the pictures illustrated below will appear on the screen. The seabed echo is represented on the screen as a thick line which realistically shows the bottom contour. When the tilt angle is decreased, the seabed trace becomes wider and weaker. By observing the seabed condition on the screen, you may prevent the net from being damaged by a reef or a shipweck.

Seabed

This distance shows the depth of the water

Ridge

Tilt: 90˚

Sea surface reflections

Seabed

Sea surface reflections

Seabed

Tilt: 60˚

Sea surface reflections

Figure 9-1 Seabed echoes

9-1

Fish Schools

A fish school appears as a mass of echoes on the screen. The color of the mass shows the density of the fishes and the size of the mass how they are distributed. In the following figures, the same fish school is observed with two different tilt angles. From the left figure, the operator can know the horizontal distribution of the fish school, and from the right figure the vertical distribution.

Width (Horizontal distribution)

Tilt: Sector Center: Range:

20˚ 0˚ 400m

Surface Fish School

Thickness (Vertical distribution)

Tilt: Sector Center: Range:

Seabed

Depth

Distance

90˚ 300˚ 400m

Bottom Fish School

Tilt: 40˚

Figure 9-2 Fish schools

Sea surface reflections

Tilt: 5˚

Seabed

Fish School

Sea surface reflections

9-2

Sea Surface Reflections

Wake produced by other ship

Wake produced by own ship when ship is turned

Wake produced by other ship

As ultrasonic pulses at both edges of the 180˚ sector beam are always emitted horizontally along the sea surface regardless of the tilt angle setting, sea surface reflections appear as a thick line extending across the own ship mark. When the sonar is used with a narrow tilt angle, the sea surface reflections cover an extended area as illustrated below.

Figure 9-3 Sea surface r eflections

Sea surface Reflections

W ake

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.

Figure 9-4 Wake appearance on the display

9-3

False Echo by Sidelobe

An ultrasonic wave is emitted only in the direction set by the TILT lever, 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.

Seabed

Sidelobe

Figure 9-5 Sidelobe echoes

Noise and Interference

Interference from a sonar on another ship appears on the screen as shown in (A) below. This interference can be suppressed by changing the CYCLE setting in TVG•TX on the data setting window. Interference from electrical equipment on board own ship appears as shown in (B) below. Noise from marine life appears on the display as shown in (C). Electrical interference and marine life noise can be suppressed with IR on the SIGNAL menu in the data setting window.

Main lobe

False Echo

Sea Surface Reflections

9-4

(A) Interference from other sonar

(B) Electrical interference

Figure 9-6 Noise and interference

WARNINGS

Overvoltage W arning

If the input voltage to this unit rises above 125 VAC, the overvoltage detection circuit activates, an alarm sounds and the message OVERVOLTAGE appears at the screen center.

If this occurs, retract the transducer , turn the power off and check the ship’s mains voltage. It should be about 100 VAC.

Unretracted Transducer Warning

If the transducer is not completely retracted within 30 seconds after pressing c, an alarm sounds and the message XDCR NOT RETRACTED! appears at the screen center.

If this occurs, do the following:

1. The power cannot be turned off because the transducer cannot be retracted. Turn off the main breaker for the display and power supply units to stop operation.

2. Confirm that the net is not tangled in the transducer.

3. Confirm that the breaker inside the raise/lower control box (mounted on the hull unit) is on.

4. Remove the cover of the raise/lower control box. Push the (Red) reset button to reset the raise/lower control box.

5. Turn on the power and press c to retract the transducer into the tank. If it does not retract, the main shaft of the hull unit may be bent. Turn off the power and manually raise the transducer up to the highest position by using the hand crank. (See the illustration on the next page.)

10-1

Breaker

F Photo No.1580

Hand Crank

Main Shaft

Power Supply Unit

Figure 10-1 How to manually raise the transducer

Hull Unit

10-2

SELF TESTS

The CSH-73 has various self tests to check it for proper operation. If a test reveals equipment malfunction do not attempt to check inside the equipment. There are no user serviceable parts inside the equipment.

DANGER

Do not work inside the equipment unless totally familiar with electrical circuits.

Hazardous voltage which will cause death or serious injury exists inside the equipment.

Opening the Self Test Menu

1. Turn on the power while pressing and holding down the MENU key. The INIT SET/TEST menu appears.

2. Press arrow keys to select SELF TEST followed by the MENU key.

INIT/SET MENU SELF TEST

Select item with dc keys and press MENU key.

Single

Continuous

Panel

Color Gray

SIO

Execute Execute

Execute

Execute Execute Execute

Figure 11-1 SELF TEST menu

3. Press up or down arrow key to select test desired.

4. Press the MENU key to start test.

5. Turn off the power to terminate the test.

11-1

Self Test Description

Single test

The ROM, RAM and other devices of the display unit are checked once. Control is returned to the SELF TEST menu when the test is completed.

START UP TEST

DCON

105-0350-1xx ROM = OK RAM = OK DPRAM = OK P.W = OK

DRAW

105-0366-1xx ROM = OK RAM = OK

DUAL

105-0381-1xx ROM = OK RAM = OK

105-0382-1xx ROM = OK RAM = OK

SLICE

105-0353-1xx ROM = OK RAM = OK

PSIO

105-0352-1xx ROM = OK RAM = OK

PIF

105-0415-1xx ROM = OK RAM = OK

BATTERY=OK

RX1

105-0343-002 ROM = OK RAM = OK

1X1 RX2

1X2

105-0351-1xx

105-0445-1xx

ROM = OK RAM = OK ROM = OK RAM = OK

ROM = OK RAM = OK

Figure 11-2 Single test

Continuous test

The devices of the display unit are checked continuously .

DCON

DRAW

DUAL

SLICE

PSIO

PIF

105-0350-1xx ROM RAM DROM DPRAM DR DPRAM DU DPRAM PS P.W EEPROM REACT

105-0366-1xx ROM RAM DROM VRAM DPRAM DC CLT

105-0381-1xx ROM RAM VRAM DPRAM DPRAM DC DPRAM ES DPRAM SL

105-0382-1xx ROM RAM DPRAM

105-0353-1xx ROM RAM DPRAM DU

105-0352-1xx ROM RAM DPRAM DC

105-0415-1xx ROM RAM MEMCARD BATTERY

CONTI TEST

105-0351-1xx = OK = OK = OK = OK = OK = OK = OK = OK = OK

105-0445-1xx = OK = OK = OK = OK = OK = OK

= OK = OK = OK = OK = OK = OK = OK

= OK = OK = OK

= OK = OK = OK = OK

11-2

Figure 11-3 Continuous test

Panel test

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This test checks the keys of the main and sub panels and the remote control box. Press and release each key. Its on-screen location should display “1” when the key is pressed and “0” when released. To escape from the test reset the power.

PANEL TEST

Figure 11-4 Panel test

Color test

This test checks for proper display color . T o escape from the test reset the power.

COLOR TEST

Figure 11-5 Color test

11-3

Gray test

This test checks for screen distortion. To escape from the test reset the power.

GRAY TEST

Figure 11-6 Gray test

SIO test

This test checks for proper communication between the display unit and transceiver unit, and requires a jumper plug. To escape from the test reset the power.

SIO TEST

DRAW

SIO

= NG

SIO

= NG

PISO

SIO1

= OK

SIO2

= NG

PIF

SIO1

= OK

11-4

Figure 11-7 SIO test

Interface Unit CS-120A Self Test

1. Open the cover of the interface unit.

2. Find DIP switch DP-1 on the lone circuit board. Turn switch #6 on to start the self test. The results of the check appear on the digital display beside the DIP switch.

3. Turn the DIP switch off after completion of the test.

Turn #6 on.

678

If the readout shows "0" the unit is functioning properly. If it is not working properly any of the following nine numerals or six alphabets appear.

, , , , , , , , , , , , , , ,

678

Digital display

Figure 11-8 Interface unit CS-120A, cover opened

11-5

This page is intentionally left blank.

MAINTENANCE

DANGER

Do not work inside the equipment unless totally familiar with electrical circuits.

Hazardous voltage which will cause death or serious injury exists inside the equipment.

Display Unit Maintenance

Handle the equipment with care.

Clean the screen and filter regularly. Cover the equipment when it is not in use.

An anti-static spray may be used to clean the screen. Do not use chemical-based cleaners; they can remove paint and markings.

Keep magnets and cassette tapes away from the display unit.

Damage can cause corrosion.

Keep heater away from the equipment.

Heat can damage the

DISPLAY UNIT

equipment. Allow sufficient ventilation.

Figure 12-1 Display unit maintenance

Magnets or magnetic material can can distort the picture.

12-1

Hull Unit Maintenance

CAUTION

The zinc block near the transducer must be replaced yearly.

The junction between the transducer and main shaft may corrode, which can result in loss of the transducer or water leakage inside the ship.

HULL UNIT

Apply MOLYTONE grease #2 every six months.

Raise transducer and coat main shaft with DAPHAECOROAEX #2 every six months.

Dry dock ship and clean transducer face yearly. Apply single coat of "MARINE STAR 20 Mod (Red-N)" anti-foulant to transducer face to keep marine life off the transducer.

Figure 12-2 Hull unit maintenance

12-2

SPECIAL MENU DESCRIPTION

SYSTEM Menu Description

The SYSTEM menu can be displayed by pressing MENU and

together. For help, press the HELP key.

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(Continued on next page)

13-2

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YALPSIDTSIHelpmaSDBTS/TRPgnilpmasrofwobs'pihsmorfelgnasteS

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evitcepserhtiwsmetiesehtkcolretninacuoY

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tluafederotserdnasgnittessunemmetsys

.sunemmetsysllanosgnittes

13-3

DATA SET Menu Description

The DATA SET menu can be display by pressing MENU and

together. For help, press the HELP key.

uneMmetInoitpircseD

EVRUCROLOC1ranoS

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2ranoS

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.yekUNEM

Display

color

C o l o r

B a r

Level setting

255

193

104

00 128 255

.evrucegnahc

.eulav

.neercseht

.yekUNEM

.yekDNE

Level

,4.onsroloctadegnahcebnacevrucroloC.2

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ottnawuoy.onrolocnorosructesotsyek

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rolocetanimretotyekUNEMehtsserP.4

nwohsyalpsideht,nehT.gnittesevruc

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.detelpmocsignittesevrucroloC

sserp,unemehtesolcdnaegnahcevasoT

sserp,unemehtesolcdnaegnahclecnacoT

(Continued on next page)

13-4

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, ,

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skraM

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otgnidroccarolocegnahcnacuoy1ranoS

EGNAHCnoegnahcotmetitcelestsriF.1

ehtsserpnehtdna,unembusROLOC

.yekUNEM

Before

(R) (G) (B) (R) (G) (G)

15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0

Display

Color

Before

(Continued on next page)

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.srolocriehtgnignahcrofsenilediug

otsyekworranwodropuehtsserP.3

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.sroloc

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.sraeppawolebnwohsyalpsideht,nehT

.neercsehtnosnoitcurtsniehtwolloF

.detelpmocsignittesevrucroloC

sserp,unemehtesolcdnaegnahcevasoT

.yekUNEM

sserp,unemehtesolcdnaegnahclecnacoT

.yekDNE

13-5

uneMmetInoitpircseD

TOOHSTEN

NALP

EDNOSTENRTMXednoSteNdnasrettimsnartednostenforebmunsteS

retemaiDteNyrassecenretemaidnruts'pihsdetamitsesteS

fonoitcipedetaruccategot,tengnitoohsrof

ybyalpsidnacuoyhcihw,kramnoitacolten

gnittesehT.yekESRUOCTENehtgnisserp

.spetsretem01nisretem0001ot002siegnar

kcolretnItliTtenforetemaidkcolretniotNOesoohC

rewoluoynehW.elgnatlithtiwkramnoitacol

kramnoitacoltenneercs-noehtelgnatliteht

tessiretemaidteneht,elpmaxeroF(.segralne

54sielgnatlitehtnehW.sretemRrof ° eht

).sretemR2sitenneercs-noehtforetemaid

.rehtohcaeneewtebsecnatsidrieht

htgneLteNot005siegnargnittesehT.htgneltensteS

.spetsretem001nisretem0003

htgneLeriW.tendnapihsnwoneewtebhtgneleriwsteS

001nisretem0001ot001siegnargnittesehT

.spetsretem

htdiWteN001ot0siegnargnittesehT.htdiwtensteS

.sretem

RROCTOLPTEN1reyaL

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.deepstnerrucretawfo%05

dnadeepstnerrucretawgnisuybdettolpsi

ehT.rosneslanretxemorfdefnoitcerid

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,snoitidnocaes,tengniredisnocsreyalgnoma

rof,tessi%05fI.cte,noitcurtsnoclessev

fodeepstasevomtenneercs-no,elpmaxe

13-6

INIT SET/TEST Menu Description

The DATA SET menu can be display by turning on the power while pressing MENU key.

The HELP key provides menu operating information.

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".543"retne

ETARDUABA021-SCF/I

1troPxuA 2troPxuA 3troPxuA

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/TINU

EGAUGNAL

TSETFLESelgniSneercS.ecnotsetflestinuyalpsidsmrofreP

htpeD.tuodaerhtpedfotinusesoohC

toohSroftsiDroftuodaernurecnatsidfotinusesoohC

erutarepmeT;tuodaererutarepmetretawfotinusesoohC

egaugnaL,hsilgnE;unemnidesuegaugnalesoohC

suounitnoC.ylsuounitnoctsetflestinuyalpsidsmrofreP

lenaPdnatinuyalpsidehtfosyekehtskcehC

.stropfo)duab(deepsnoissimsnartatadteS

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gniyekrofcigolevitagenroevitisopsesoohC

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tsetyarggniyalpsidybkcehcnoitrotsid

,rednuosohceroranoslanretxemorfdefeslup

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.noitareporeporprofxoblortnocetomer

(Continued on next page)

roloC.srolocfoyalpsidreporprofskcehC

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OISehtneewtebtsetnoitacinummocstcudnoC

aseriuqeR.tinureviecsnartdnatinuyalpsid

.gulptset

13-7

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noitartsnomeD.esuerutufrofdevreseR

CERTENS/EelacSoiduAS/EfoedistfelrothgirnoelacshtpedsyalpsiD

tsujdAtfarDSEohcenohtpedeurtdaerottfards'pihssteS

tceleS2SE;trop2SEotdetcennoctnempiuqestceleS

egnaRceRteNrettimsnartredrocertenfoegnargnidnuossteS

.tinu

STLUAFEDstluafeD.sgnittestluafedserotseR

sllaceRmargorP.esuerutufrofdevreseR

SREHTOYEKTNEVEotsnoitcnufyekTNEVEehT:TNEVE

.deyalpsidsinrettaptsetA.stinurehto

.yalpsidrednuosohce

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.kramtneveebircsni

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lortnocetomerehtnoyekTOOHS

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.worran

13-8

MENU TREE

Event Mark 1 Event Mark 2 Fish Mark On Track Data Text Window ES Window

Range/Bearing Heading Mark Range Rings Bearing Scale

Auto Scan Width Auto Train Width

Ship's Track Net Movement Plot Fish MK Connect Fish Tracking MK Fish Track Plot

w/Current Vec w/Current Vec w/Current Vec

Current Flow Dir

Hist Window Dsp Fish Histogram

Save Method

Save

List Save Delete Initialize

ON OFF ON OFF ON OFF

Depth Temp OFF ON OFF Current Sonde

ON OFF

Audio H-Slice

ON OFF

From To

Whole Est MK QK Save

Execute

CURRENT VEC

HIST DSP/GRPH

SAVE PICTURE

MARK DSP 1

MARK DSP 2

FUNCTION KEY

CARD NET DATA

CARD ECHO DAT

CARD UTILITY

DATA DISPLAY

USER MENU

ON OFF

USER Menu

A-1

DATA SET Menu

Setting range: 200-1000 m ON OFF

Setting range: 0-3000 m Setting range: 0-1000 m

Execute Execute Execute

Execute

Execute Execute

Execute

CHANGE COLOR

DATA SET MENU

Sonar 1 Sonar 2 Echo Sounder Marks

Execute

NET SHOOT PLAN

Net Diameter Tilt Interlock

COLOR CURVE

Sonar 1 Sonar 2 Echo Sounder 1 Echo Sounder 2

Net Width

Execute (Qty plus distances)

Setting range: 0-200 m

NET SONDE

Net Sonde XMTR Net Length Wire Length

NET PLOT CORR

Layer 1 Layer 2 Layer 3

Setting range: 0%-100%

A-2

INIT SET/TEST Menu

Setting range: 0°-359°

INIT SET/TEST MENU HEADING ADJ

Heading Adjust

NMEA 4800, 9600 bps

Negative Positive Negative Positive

EXT KP

KP Out Polarity EXT KP Polarity

Gray SIO

Execute Execute

ECHO TEST

Display Test Demonstration

Execute Execute

Execute

SELF TEST

Single Continuous Panel

Color

Setting range: 0-10 m ES Net Rec

Left Right

Setting range: 80-640 m

ES/NET REC

ES/Audio Scale ES Draft Adjust ES 2 Select

Net Rec Range

Execute Execute

DEFAULTS

Defaults Program Recall

2400, 4800 bps

BAUD RATE

I/F CS-120 Aux Port 1 Aux Port 2 Aux Port 3

2400, 4800 bps 2400, 4800 bps 2400, 4800 bps

Meter

UNIT/LANGUAGE

Depth Dist for Shoot Water Temp Language

Mile Meter Feet °C °F English Japanese Korean

EVENT SHOOT CIF NMEA1.5 NMEA2.0

OTHERS

EVENT KEY Data Format

Auto Tilt

WIDE NARROW

A-3

SYSTEM Menu

SYSTEMMENU

SIGNAL PROCESS

FAR TVG

(CSH-53, 71, 73, 81, 83) (CSH-53, 71, 73, 81, 83 15log 20log 25log 30log)

TM DSP

TARGET LOCK

BRG READOUT

Smooth Echo - - - Rng

Smooth Echo - - - Cir Delete Color

Far TVG Curve

TM Display Range

Tracking Method Fish Speed Limit Tracking Factor

Fish Track Window Fish Spd Update Target LK Window

Course Current Data Event Mark

Other Marks

Setting range: 0 to 3 Setting range: 0 to 3 Setting range: 1 to 10

25log 30log 35log 40log

1.3R 1.6R

TGT Mark Fish Auto Setting range: 1 to 15 kt Setting range: 1 to 10

Setting range: 1 to 10 m 15 30 40 60 Sec

Normal Large Largest

32 Cmps 360° True

32 Cmps 360° True 180° Rel 360° Rel

DATA DISPLAY

MARK SIZE 1

MARK SIZE 2

ES/NET REC

Control Setting Text Window Data

Trackball Mark Target Lock Mark Event Mark

Event Mark Fish Mark Own Ship Pos MK

Own Ship Mark Net Shoot Mark Estimate Mark

Current Vector Range Rings Ship’s Track MK

ES 1 Color Curve

OFF Sonar TGT Lock

1 2 3 4

+(S) +(L)  (S)  (L) (S) (L) (S) (L)

(S) (L)

(S) (L) (S) (L)

(S) (L)

32 x 32 64 x 64 Normal Long

1/4 R 1/2R 5R 10R 20R 40R

Linear log1 log2 log3

(Continued on next page)

A-4

ES 2 Color Curve Picture Advance

Advance at Shoot Net Rec Picture

Linear log1 log2 log3 1/1 1/2 1/4 1/8

KP Sonde UP/Down Down

Execute

DEFAULTS

Defaults

HIST DISPLAY

PRT/STBD Sample

Net Shoot Mark Target Lock

ON OFF

INTERLOCK

Tilt Range Event Mark

Fish Mark

SYSTEM MENU

(Continued from previous page)

Setting range: 0°-180°

H-Slice Width 1 2 3 4

A-5

This page is intentionally left blank.

SPECIFICATIONS

Model: CSH-73-M 150 (Freq.: 150 kHz)

180 (Freq.: 180 kHz)

1. GENERAL

(1) Range, TX Cycle, Pulselength

cisaB

egnaR

retnecff\FO

"FFO"

5757-0001-023.0-90.02-5.0

001001-0331-093.0-41.02-5.0 051051-0042-035.0-12.03-5.0 002002-0023-046.0-82.04-5.0 003003-0084-058.0-14.06-6.0 004004-0046-060.1-45.08-8.0 005005-0008-082.1-86.001-0.1 006006-0069-094.1-18.021-2.1 008008-00821-029.1-80.151-5.1

00010001-00061-043.2-43.102-0.2 00210021-00291-077.2-16.152-5.2 00610061-00652-026.3-41.203-0.3 00020002-00023-084.4-86.204-0.4

)m(egnaR

"NO"retnecffO

elcyCXT

)ces(

htgnelesluP

)cesm(

NOTE

1) Transmission cycle is selectable in 10 steps.

2) External keying pulse can be used as a trigger.

3) Maximum range scale does not mean maximum range. Detection capability depends on nature of fish school and sea condition.

(2) Audio Search

Sector: 30º, 60º, 90º, 180º, selectable Method: By built-in loudspeaker Output: 2 W Frequency: 1.1 kHz with reverberation effect

SP-1

(3) Transceiver

Transmitter: High power MOS FET amplifier with 10-step power reduction switch Receiver: Low noise superheterodyne, continuously scanning beam forming,

TVG, AGC, signal/processing, interference rejecter, horizontal vertical beam switching.

(4) Beamwidth (-3 dB) and Tilt Angle

TX Beamwidth: 180º (horizontal) x 6º to 11º (Vertical) RX Beamwidth: 5º to 10º (horizontal) x 6º to 11º (Vertical) Tilt Angle: 0º (horizontal) to 90º (vertical), continuous.

NOTE: Beamwidth depends on transmitter frequency.

2. Display

(1) Picture display PPI display on 15 inch non-glare, high-resolution color CRT (2) Color 16 colors (sonar picture), 4 colors (marks) (3) Display mode a) Normal Mode (with or without data display)

b) Off-center c) Echo sounder combination (normal plus echo sounder) d) Audio combination e) Horizontal slice combination

(4) Display Marks Own ship mark, heading mark, range rings, range/bearing mark,

trackball mark, event mark, net shooting mark, fish mark, estimate mark,bearing scale, north mark*, ship’s track*, current mark*, net sonde mark*, target luck mark*

(5) Alphanumeric Data

Sonar picture (range, tilt angle, gain) Trackball mark data (slant range, horizontal range, depth, bearing) Event mark data (horizontal range, depth, first event marked depth,bearing) Fish mark data (distance moved*, direction* and speed* between two latest fish marks) Estimate mark data (estimation of fish volume by echo strength) Net shooting data (time and distance run* between turning on and off of net shooting mark) Setting change data (new setting appears in larger characters for 5 seconds when changed) Current data *(current speed, direction, layer, depth) Navigation data *(ship’s speed, heading, water depth, water tempera ture)

SP-2

*Own ship’s position (latitude/longitude) Net sonde data (net depth, distance to seabed, water temperature, sinking speed of net)

(6) Features Custom mode, interference rejector, afterglow, noise limiter, delete

color, memory card (save and recall of picture, echo inside estimate mark and net shooting data), automatic tilt, automatic target tracking *(target lock), external KP sync, heading up, fish alarm, overvoltage warning, unretracted transducer warning, remote control *: External sensor required.

3. HULL UNIT

levarTmm008levarTmm0021

levarTRCDXmm008/mm006mm0021/mm008

emiTgnisiaR)levartmm008rof(ces61)levartmm0021rof(ces52

emiTgnirewoL)levartmm008rof(ces51)levartmm0021rof(ces42

metsySgnivirDlortnoccirtceleetomeR

s'pihselbawollA

deeps

4. POWER CONSUMPTION

100VAC,50/60Hz, 1φ, 1 kVA on average, 3 kVA max. 110/220VAC operation available with stepdown transformer PT-400.

5. EMBIRONMENTAL CONDITION

(1) Temperature 0 ºC to 50 ºC (2) Relative Humidity

85% or less

)noitareporewol/esiargnirudsbonk51(sbonk81

6. COATING COLOR

(1) Display Unit: N3.0 Newton No.5 for front panel

Munsell 2.5GY 5/1.5 for cabinet

(2) Transceiver Unit and Hull Unit

Munsell 2.5G 7/2 Newton No.5

SP-3

This page is intentionally left blank.

Furuno CSH-73 User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

SAFETY INSTRUCTIONS

TABLE OF CONTENTS

FOREWORD

A Word to CSH-73 Owners

Features

System Configuration

CONTROL DESCRIPTION

Control Layout on Display Unit and Remote Control Box

Main Panel

Sub Panel 1

Sub Panel 2 (data setting window)

Remote Control Box

OPERATIONAL OVERVIEW

Turning the Power On/Off

Adjusting Screen Brilliance, Control Panel Backlighting

Lowering the Transducer

Selecting a Display Mode

Selecting a Display Range

Setting the T ilt Angle

Adjusting the Gain

Measuring Range and Bearing to a Target

FINE TUNING THE PICTURE

Eliminating Unwanted Feeble Echoes

Suppressing Seabed Tail

Suppressing Seabed and Sea Surface Reflections in Shallow Waters

Rejecting Sonar Interference and Noise

Adjusting Beamwidth

MARKS AND DATA

Marks, Data and Display Mode

Permanently Displayed Marks and Data

Erasable Marks and Data

USER MENU OVERVIEW

USER Menu Operation

USER Menu Description

FUNCTION KEYS

Programming the Function Keys

Replaying a Function Key

Function Key Fine Tuning

Saving Function Key Settings to a Memory Card

Replaying Function Key Settings from a Memory Card

ADVANCED LEVEL OPERATION

Finding Fish School Center

Tracking a Fish School (target lock)

Detecting Fish Schools Aurally

The Fish Alarm

Relocating Fish School for Easy Observation

Comparing of Fish School Concentration

Measuring Fish School Speed

The Event Mark

True Motion Display

Plotting Net Location Mark

Setting Distances Between Net Sonde Transmitters

Observing Net Behavior

Port/Starboard, Horizontal Slice Displays

Turning Marks, Data On/Off

SAVING, REPLAYING PICTURE

Initializing Memory Cards

Saving the Picture

Transferring Echo Data from Internal Memory to Memory Card

Saving Net Shooting Data

Replaying Saved Data

Deleting Memory Card Contents

INTERPRETING THE DISPLAY

Seabed Echoes

Fish Schools

Sea Surface Reflections

W ake

False Echo by Sidelobe

Noise and Interference

WARNINGS

Overvoltage W arning

Unretracted Transducer Warning

SELF TESTS

Opening the Self Test Menu

Self Test Description

Interface Unit CS-120A Self Test