Koden CVS-FX1 Basic Operation Manual

Declaration of Conformity

(As referred to in Annex IV 2. of Directive 2004/108/EC)

Declares under his sole responsibility that the produced Echo Sounder manufactured by

Koden Electronics Co., Ltd.

5278 Uenohara

Uenohara-Shi

Yamanashi-Ken

,

409-0112, Japan

Telephone [phone] Telefax [phone]

Identified by the type number CVS-FX1 to which this declaration refers conforms to the

relevant essential requirements of Directive 2004/108/EC and is in conformity with the EMC
requirements of EU harmonised standard

EN 60945: 2002 ( Clauses 9,10 & 12 )

Authorised representative in Europe

Heinz Hoghoff
Koden Elektronik GmbH.
Am Gewerbepark 15
D-64823, Gross–Umstadt
Germany.
Phone [phone]
Telefax+49 6078 73824

Signed :
Heinz Hoghoff,

Dated : 24 Jun. 2011 Document No. 71-2731U-X002

N.B. As this product is for Maritime use compliance with Directive 72/23/EEC is not required.

CVS-FX1 Document Revision History

CVS-FX1 Basic Operational Manual

Doc No. 0093101112

Document Revision History

No. Doc. No-Rev. No.

Date revised

(Y/M/D)

0 0093101112-00 2011/11/09 First edition

1

2

3

4

5

6

7

8

9

Revised content

10

Document No. Revised Version Norm

When part of the document needs to be revised, the document has advanced revision number. The
document No. is indicated at the lower right side on the cover and at the left or right side of the footer
region of each page.

© 2011 Koden Electronics Co., Ltd. All rights reserved.

No part of this publication may be reproduced, transmitted, translated in any form by any means without
the written permission of Koden Electronics Co., Ltd. The technical descriptions contained in this
publication are subject to change without notice. Koden assumes no responsibility for any errors,
incidentals or consequential damages caused by misinterpretation of the descriptions contained in this
publication.

0093101112-00 i

Important Notice CVS-FX1

Important Notice

 For copy and transcription of this Operation Manual (hereinafter referred to as this

manual), permission from Koden is needed. Koden prohibits the un-authorized copy and
transcription of this manual.

 If this manual is lost or damaged, consult a dealer of Koden or Koden.

 The specification of the products and the contents in this manual are subject to change

without notice.

 The contents displayed on the menu of product may be different from the expression of

this manual. The fonts and shapes of the keys and menus in the illustration may differ
from the actual ones, and some parts may be omitted.

 Koden is not liable for damages and troubles arisen from misunderstanding of the

contents in this manual.

 Koden is not liable for any damages caused by earthquake, lightning, wind and flood

damage and fire for which Koden is not responsible, and actions by third parties, other
accidents, customer’s unintended error/abuse and the use under other abnormal
conditions.

 Koden is not liable for damages of accompaniment (change/loss of memorized content,

loss of business profit, stop of business) arisen from use or failure of our products.

 If the stored data are changed or lost, irrespective of causes of troubles and damages,

Koden is not liable for them.

 Koden is not liable for any damages arisen from malfunction caused by combination of

software and connected equipment in which Koden is not engaged.

ii 0093101112-00

CVS-FX1 For Your Safe Operation

For Your Safe Operation

Pictograms used in this Operation Manual

The following pictograms are used in this manual. The meaning of each symbols shall be well
understood and the maintenance and inspection shall be carried out.

Symbol Meaning

Mark for warning

Warning

This mark denotes that there is a risk of death or serious injury when dealt
with incorrectly.

Mark for danger of high voltage

This mark denotes that there is a risk of death or serious injury due to

electric shock when dealt with incorrectly.

Mark for caution

Caution

This mark denotes that there is a risk of slight injury or damages of

devices when dealt with incorrectly.

Mark for prohibition

This mark denotes prohibition of specified conducts. Description of the
prohibition is displayed near the mark.

Precautions on equipment

Be careful of high voltage inside

High voltage, which may risk you life, is used. This high voltage may
remain in the circuit even after the power is switched off. To prevent
contact with the high voltage circuits accidentally, a protective cover or
the label with this mark is provided on the high voltage circuit. When the
inside is to be checked, ensure to switch off the power and to discharge
the residual voltage for safety. An engineer authorized by Koden shall
carry out the inspection and maintenance works.

Power off in the boat

Warning

An accidental power-on during works may result in worker’s
electrification. To prevent such accident in advance, ensure that power
in the boat and on the equipment are switched off. Furthermore, it is
safer to hang a caution tag saying “Under work” near the power switch
of equipment.

Be careful of dust

Warning

Inhaled dust may cause respiratory affection. At the time of cleaning the
inside of equipment, be careful not to inhale dust. Wearing a safety
mask is recommended.

0093101112-00 iii

For Your Safe Operation CVS-FX1

Caution on location of installment

Caution

Caution

Caution

Precautions on handling

The equipment shall not be installed at locations which are excessively
damp and suffers from water drops. Otherwise, dew condensation may
occur inside the display screen, and corrosion may occur inside the unit
box.

Measures against static electricity

Static electricity may be generated from the carpet on the floor in the
cabin or clothes made of synthetic fiber, and it may destroy the
electronic components on circuit boards. The circuit boards shall be
handled with appropriate measures against static electricity.

Caution at installation of transducer

Transducer shall be installed at locations where there is no effect by
bubble and noise. Bubble and noise may seriously degrade the
performance of this equipment.

Warning

Warning

Caution

Caution

Caution

No disassembly or modification of this equipment is allowed. It may lead
to failure, firing, smoking or electric shock. In case of failure, please
contact Koden’s dealers or Koden.

In case of smoking or firing, switch off the power in the boat and of this
equipment. It may lead to firing, electric shock or damages.

Be careful of residual high voltage

High voltage may remain in capacitors for several minutes after
switching off the power. Before inspection of the inside, please wait at
least 5 minutes after switching off or discharge the residual electricity in
an appropriate manner. Then, start the work.

The information displayed on this equipment is not intended to use for
your navigation. For your navigation, be sure to see the specified
materials.

Please use the specified fuses. If un-specified fuses are used, they may
cause firing, smoking or damages.

Be sure to submerge the transducer in water before transmission. If
not, it may be damaged.

iv 0093101112-00

CVS-FX1 Contents

Contents

Document Revision History .......................................................................................................i

Important Notice ....................................................................................................................... ii

For Your Safe Operation .......................................................................................................... iii

Contents ...................................................................................................................................v

Introduction............................................................................................................................. vii

Chapter 1 Preparation ..............................................................................................1-1

1.1 To use keys..................................................................................................................... 1-1

1.2 Power On/Off .................................................................................................................. 1-3

1.2.1 Power On............................................................................................................................ 1-3

1.2.2 Power Off............................................................................................................................ 1-3

1.2.3 Power Voltage Alarm.......................................................................................................... 1-3

1.3 Selection of language to be displayed............................................................................ 1-4

1.4 To use Menu ................................................................................................................... 1-5

1.4.1 Open/Close the Menu ........................................................................................................ 1-5

1.4.2 Operation of the Menu........................................................................................................ 1-6

1.4.3 Open/Close of Submenu .................................................................................................... 1-8

1.4.4 Operation of SUBMENU..................................................................................................... 1-9

1.5 To read echo sounder’s screen......................................................................................1-11

1.6 Adjustment of brilliance for comfortable viewing........................................................... 1-14

1.6.1 Adjustment of LCD brilliance ............................................................................................ 1-14

1.6.2 Adjustment of panel brilliance .......................................................................................... 1-15

Chapter 2 Basic operation .....................................................................................2-1

2.1 Switch screen images (Setting up of CM menu)............................................................. 2-1

2.1.1 Display of 1-frequency/displays of 2-frequency and more ................................................. 2-1

2.1.2 Setting frequency to match the transducer to be used ...................................................... 2-3

2.1.3 Displaying of zoom images ................................................................................................ 2-6

2.1.4 Display of mixed images .................................................................................................. 2-15

2.1.5 Selection of pulse length .................................................................................................. 2-19

2.1.6 Selection of frequency bandwidth .................................................................................... 2-22

2.1.7 Selection of gain changing method .................................................................................. 2-25

2.2 Adjustment of echo sounder......................................................................................... 2-26

2.2.1 Switching of depth range mode........................................................................................ 2-26

2.2.2 Switching of Normal/Zoom for range and shift operation ................................................. 2-28

2.2.3 Manual change of a range for normal image ................................................................... 2-29

2.2.4 Manual change of shift positions of normal images ......................................................... 2-36

2.2.5 Adjustment of image gain................................................................................................. 2-46

2.2.6 Adjustment of TVG ........................................................................................................... 2-55

2.3 Changing of the image scroll speed ............................................................................. 2-67

2.4 Finding out depth of targets in images (VRM operation) .............................................. 2-69

2.4.1 Changing of VRM follow interval ...................................................................................... 2-70

2.4.2 Operation of VRM in Active Screen.................................................................................. 2-72

2.4.3 Operation of VRM on all Screens..................................................................................... 2-74

2.5 Reduction of noise on images ...................................................................................... 2-76

2.5.1 To reject interference........................................................................................................ 2-76

2.5.2 To erase the weak response from dust and plankton, etc................................................ 2-80

2.5.3 To reduce noise ................................................................................................................ 2-86

Chapter 3 To make the best of [CM] keys.................................................................3-1

3.1 To use [CM] keys ............................................................................................................3-1

0093101112-00 v

Contents CVS-FX1

3.1.1

To use [CM] key for switching screen modes ..................................................................... 3-2

3.1.2 To use [CM] keys as one touch switch to the memorized setting to the fishing positions.. 3-6

3.1.3 Use [CM] keys as screen mode switching and one touch switch of setting:....................3-10

Chapter 4 Useful operation ...................................................................................... 4-1

4.1 Temporary change of images for better view .................................................................. 4-1

4.2 Use function keys ([F1]/[F2])........................................................................................... 4-1

4.2.1 To use function keys ([F1]/[F2]) ..........................................................................................4-1

4.2.2 Assign intended operation to function keys ([F1]/[F2]) ....................................................... 4-2

4.3 Switching of range mode ................................................................................................ 4-3

4.3.1 Switch to manual operation ................................................................................................4-3

4.3.2 Setting of auto range ..........................................................................................................4-4

4.3.3 Setting auto shift ................................................................................................................. 4-6

4.4 To use event key ............................................................................................................. 4-8

4.4.1 Registration of waypoints.................................................................................................... 4-8

4.4.2 To store images ..................................................................................................................4-8

4.4.3 Starting up Homing .............................................................................................................4-9

4.4.4 Selection of event key function .........................................................................................4-10

4.5 Shortcut to range registration menu.............................................................................. 4-12

4.6 To move the position of menu .......................................................................................4-13

Chapter 5 Index ....................................................................................................... 5-1

vi 0093101112-00

CVS-FX1 Introduction

Introduction

CVS-FX1 is an LCD color echo sounder that can display images in 4 optional frequencies.

This unit equipped with the latest digital process can accurately display circumstances in the
water under all conditions, with a good match with the high brilliance 12.1 inch LCD.

The main features of this unit are as follows:

 This unit is a multi-frequency echo sounder with broadband transducers.

 With a simple operation on a menu, frequencies up to 4 can be optionally set within a wide

range.

 With digital reception processing, the high resolution in shallow depth and the noise

reduction capability in deep depth are both attainable. In addition, optimum images can be
displayed by the auto mode function.

 The high-performance LCD maintains high visibility under any conditions.

 With adoption of a special filter (AR coated), images can be seen clearly even under the

direct sunlight. Well protected against reflection on the LCD screen and dew condensation.

 This unit has high waterproof level and can be installed in an open bridge.

 Sona-Tone

TM

(Sonar sound) function provides fish school status by sound..

 Up to 500 graphic images can be stored. Homing function is available by pushing event

key while recalling the stored images, to provide navigation guidance to the designated
position (optional GPS is required).

 Various alarm functions are available (Bottom, school of fish, water temperature*, vessel

speed*, arrival*, XTE*, power source).

(Note: The mark * denotes that the connection of optional sensors is required)

 By flush mounting, the unit can be easily installed from the front side.

 RGB analog output to an external monitor is provided as standard. The use of external

monitor enables to observe the echo sounder images from the place distant from the main
unit (External monitor is owner supply).

0093101112-00 vii

CVS-FX1 Chapter 1 Preparation

Chapter 1 Preparation

1.1 To use keys

Key board of CVS-FX1

NO. Key Name Description

1 [BRILL ] Press: Power on. Adjusts brilliance of the screen and

panel.
Long-press: Power off.

2 [SHIFT/ M OFF] Press: Switches ON/OFF of Shift

Long-press: Changes of range mode
(Auto range/Manual/Auto Shift)

3 [▲SHIFT▼] Changes the shift position setting.
4 [▲RANGE▼] Changes the range setting.
5 [NORMAL/ZOOM] Press: Switches NORMAL/ZOOM assignment of

[RANGE] [SHIFT] keys.
Long-press: Short-cut to the range setting menu.

6 [GAIN-L/SEL]

(Gain knob)

7 [GAIN-R/SEL]

(Gain knob)

8 [CM1] • • • [CM6] Press: Recalls CM (CM: Condition Memory. See P2-1)

9 [F1] (Function key 1) Press: Recalls directly the item registered.

10 [F2] (Function key 2) Press: Recalls directly the item registered.

11 [SUB MENU] Opens/Closes the Submenu.

12 [CURSOR]▲ ▼

13 [MENU] Press: Opens/Closes the Menu.

Selects item of Menu/Submenu

Rotate: Gain adjustment at low frequency side
Press: Switches of operation screen at low frequency
side
Rotate: Gain adjustment at high frequency side
Press: Switches of operation screen at high frequency
side

Switches screen modes
Long-press: Starts copy of CM

Long-press: Selects and saves the item to register

Long-press: Selects and saves the item to register.

Return to the Menu of the previous operation

Changes the setting values for the Menu/Submenu.
Moves the markers (VRM, event).
Changes the Shift.

Closes submenu and control boxes.

Long-press: Activates function to move

Menu/Submenu position on the screen.

14 15 16

1312 11 10 9 8 7 6 5 4 3 2 1

0093101112-00 1-1

Chapter 1 Preparation CVS-FX1

14 [←│←/NAV] Press: Changes the image scroll speed.

Long-press: Displays the navigation screen.

15 [EVENT] Press: Outputs the present position or the event

cursor position in TLL sentences. Store image.
Starts homing.

Long-press: Displays the images of CCD camera.

16 [ENT] Ends input of setting value digits for Menu/submenu.

Temporary erasing of displayed items on screen.

There are two types of pressing of keys, which are Press and Long-press.

1. Press: Press the key with a finger and release immediately.

2. Long-press: Keep pressed until the screen display responds.

Normal operation is done with [Press].

When the relevant key is long-pressed, the control box of the function defined for the key is

displayed. Release the finger from the key, once the control box is displayed.

[GAIN-L/SEL] knob and [GAIN-R/SEL] knob are the knobs for gain
control.

Operation of the gain knobs are in two ways, [Rotate] and [Press].

1. Rotate: Turn the knob clockwise or anticlockwise

2. Press: Press the top of the knobs.

1-2 0093101112-00

CVS-FX1 Chapter 1 Preparation

1.2 Power On/Off

1.2.1 Power On

Press the [BRILL

] key to power on.

The start-up screen is displayed. On start-up, the internal memory (ROM and RAM) is
automatically checked. If the checking completes normally, the message is displayed as
below.

KM-F11 Ver.01 08

ROM check OK RAM check OK

Caution: If an error occurs during the memory check, LEDs on the operation

panel blink to indicate possible failure of the unit. In this case, please
contact a dealer of Koden or Koden.

1.2.2 Power Off

Keep pressing the [BRILL

] key for 3 seconds to power off. After countdown for

power shut down, when the indication below is displayed, release the finger off from the key.

After 15 seconds, power is switched off automatically.

Please wait for a while.
Power shutdown process in progress.

1.2.3 Power Voltage Alarm

When nonstandard power voltage is detected, the icon starts blinking and generates
alarm.

Caution: The power will be automatically switched off when the voltage is low (8.5

V or lower) or high (34 V or higher). The accuracy of power voltage indication is
± 0.5 V.

0093101112-00 1-3

Chapter 1 Preparation CVS-FX1

1.3 Selection of language to be displayed

When the power is switched on for the first time after installation, the following [Language]
screen is displayed.

Select a language using [▲] key or [▼] key of .

To decide the language, press [MENU] key .

Caution: There are the other languages than English and Japanese for selection..

1-4 0093101112-00

CVS-FX1 Chapter 1 Preparation

1.4 To use Menu

CVS-FX1 has two kinds of menu, [MENU] and [SUBMENU].
The operation of the both menus is basically the same.

1.4.1 Open/Close the Menu

To display the menu, press the [MENU] key .

List of menu items and message boxes of operation guide and function guide are displayed
as shown below:

Name of the selected Menu Cursor

Menu column Setting item column Setting value column

Operation
guide

Function
guide

The operation guide is displayed when [SUBMENU], [System] and [Guide Window] are all
on. (See the

Full Menu Reference “5.2.1 Display/No display of Guide Window”)

The function guide is displayed when [SUBMENU], [System] and [Func. Guide Window] are
all on. (See the

Full Menu Reference “5.2.2 Display/No display of Func. Guide Window”)

To close the menu, press [MENU] key .

The [MENU], [Guide Window] and [Func. Guide Window] on the screen disappear.

0093101112-00 1-5

Chapter 1 Preparation CVS-FX1

1.4.2 Operation of the Menu

Press [▲] key or [▼] key of to select a menu item while Menu is displayed.

List of the setting items changes to the corresponding contents with the selected menu item.

Menu column Setting item column Setting value column

Press [ ] key of .

Then, a cursor appears in the Setting item column.

Menu column Setting item column Setting value column

Press [▲] key or [▼] key of to select the item to change.

1-6 0093101112-00

CVS-FX1 Chapter 1 Preparation

Press [ ] key of . ., and the setting box appears with the corresponding selection items.

Press [▲] key or [▼] key of , to change the setting.

Press [

] key of or [SUBMENU] key . Then, the cursor returns to the setting

item column.

To return to the menu column, press [

] key of or [SUBMENU] key .

Then, the cursor returns to the menu column.

Press [MENU] key to close the menu.

Caution: Menu disappears when [MENU] key is pressed during menu operation.

0093101112-00 1-7

Chapter 1 Preparation CVS-FX1

1.4.3 Open/Close of Submenu

To display the Submenu, press the [SUBMENU] key .

List of Submenu items, operation guide box and function guide box are displayed as shown
below:

Name of the selected menu Cursor

Menu column Setting item column Setting value column

Operation
guide

Function
guide

The operation guide is displayed when [SUBMENU], [System] and [Guide Window] are all
on. (See the

Full Menu Reference “5.2.1 Display/No display of Guide Window”)

The function guide is displayed when [SUBMENU], [System] and [Func. Guide Window] are
all on. (See the

Full Menu Reference “5.2.2 Display/No display of Func. Guide Window”)

To close the Submenu, press [SUBMENU] key or [MENU] key .

[SUBMENU], [Guide Window] and [Func. Guide Window] disappear.

1-8 0093101112-00

CVS-FX1 Chapter 1 Preparation

1.4.4 Operation of SUBMENU

Press [▲] key or [▼] key of to select a menu item during SUBMENU is displayed.

List of the setting items changes to the corresponding contents with the selected Submenu
item.

Menu column Setting item column Setting value column

Press [

] key of .

Cursor appears in the setting item column.

Menu column Setting item column Setting value column

Press [▲] key or [▼] key of to select the item to change.

0093101112-00 1-9

Chapter 1 Preparation CVS-FX1

Then, press [ ] key of , and the setting box appears with the corresponding selection
items.

Press [▲] key or [▼] key of to change the setting.

To return the cursor to the set item column, press [

] key of or [SUBMENU] key

of . Then, the cursor returns to the set item column.

To return to the menu column, press [◄] key of or [SUBMENU] key of .

Then, the cursor returns to the menu column.

To close the menu, press [SUBMENU] key or [MENU] key .

Caution: When [MENU] key is pressed during operation of the Submenu,

the display of the Submenu will disappear.

1-10 0093101112-00

CVS-FX1 Chapter 1 Preparation

1.5 To read echo sounder’s screen

A screen of echo sounder consists of the header display in a gray color stripe at upper
portion and the image display part of the echo sounder.

The header display indicates setting status of various functions by icons for easier
understanding.

The echo sounder image display part overlays the necessary information for fish school
finding.

6 7 8 5 4 3 2 1

11

12

13 15 14 16 17 18 19 20 14 15 12 19 20

Header display

9

10

No. Name Description

1 Range Mode [Auto Range] for Auto Range

No display for Manual
[Auto Shift] for Auto Shift

2 [SHIFT] and [RANGE] status

icon

3 Shift mode icon Shift: All screens same

4 Range mode icon All screens same

0093101112-00 1-11

Shift/Range on normal screen
Shift on partial zoom/Range zoom screen

Shift: Scr. Individual

Shift off

Scr. Individual

Chapter 1 Preparation CVS-FX1

5 Gain (TD) L2: Gain value of low frequency 2

L1: Gain value of low frequency 1
H2: Gain value of high frequency 2
H1: Gain value of high frequency 1

6 CM icons

7 Alarm setting status

8 [EVENT] key status

(indicates the settings)

9 Image scroll speed

10 F1]/[F2] key status icon

(indicates the settings)

CM1 on display
CM2 on display
CM3 on display
CM4 on display
CM5 on display
CM6 on display

: Bottom Alarm ON
: Fish Alarm ON
: Speed Alarm ON
: Arrival Alarm ON
: XTE Alarm ON
: Water Temp Alarm ON

No display: No Alarm activated

: Position storage and TLL output
: Image storage
: Start Homing

: High speed
: Stop
: Normal (1/1)
: Low speed

: Shift Digit Input
: IR (Interference rejection)
: Color Erase
: Noise Reduction
: Background color
: TVG Adjust
: White Line
: A Scope
: Image Swap
: Image Title
: VRM Interval
: Sona-tone
: Nav Start
: Image Recall

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CVS-FX1 Chapter 1 Preparation

Display portion of echo sounder images

No. Name Description

11 Time marker

White/Black and Green/Black switch at every 5
minutes.

12 Image title

Numerical value: Frequency

13 Color Bar Scale Scale for color representation of images by echo

sounder

14 Zoom image title

15 Gain knob icon

None : Operation unavailable

16 Water temperature Value of water temperature ( ˚C or ˚F)
17 Vessel speed Vale of vessel speed (kn, km/h or mph)
18 Water depth Depth of sea bottom (m, J.fm, fm, I.fm, ft)
19 Scale Depth scale of normal images and zoom images
20 Zoom range bar

Alarm range bar

Bar to indicate the display range of zoom images
against normal images
Bar to indicate the alarm range against normal images

indicates the image scroll speed.

: White/Black indicates 10 seconds.
: Green/Black indicates 10 seconds.
: White/Black indicates 1 minute.

: Green/Black indicates 1 minute.
: High frequency 1
: High frequency 2
: Low frequency 1
: Low frequency 2
: Mix A
: Mix B
: Mix C
: Mix D
: Fish school size

: Sea bottom-fixed zoom
: Sea bottom discrimination zoom
: Zoom
: Bottom follow zoom
: Bottom follow zoom with high frequency 1
: Bottom follow zoom with high frequency 2
: Bottom follow zoom with low frequency 1
: Bottom follow zoom with low frequency 2

: Individual gain, individual range, individual

shift and VRM operation are available.
: Individual gain operation is available
: Individual range, shift and VRM operation are

available.

0093101112-00 1-13

Chapter 1 Preparation CVS-FX1

1.6 Adjustment of brilliance for comfortable viewing

1.6.1 Adjustment of LCD brilliance

The brilliance of screen can be adjusted with [LCD Brill].

Each time [BRILL

When [BRILL

When [▲] key of is pressed, the screen turns brighter and when [▼] key is pressed,

the screen turns darker.
1 is for the darkest and 10 is for the brightest.

To close the menu, press [MENU] key .

For finer adjustment at 1 to 10 individually, point the cursor to the desired number of [Brill
Set] by [▲] or [▼] keys of while the [LCD Brill] box is on display.

Press [ENT] key , and the box for [Brill Set] appears.

] key is pressed, [LCD Brill] and [Panel Brill] are switched over.

] key is pressed, the [LCD Brill] box is displayed

Point the cursor to the digit to be changed with [

Numeric value increases with [▲] key.
Numeric value decreases with [▼] key.

Press [ENT] key , and the value is set and returns to the [LCD Brill] box.

To close the menu after setup of the value, press [MENU] key .

1-14 0093101112-00

] or [ ] keys of and:

CVS-FX1 Chapter 1 Preparation

1.6.2 Adjustment of panel brilliance

The brilliance of display panel can be adjusted at [Panel Brill]

Each time [BRILL

When [BRILL

When [▲] key of is pressed, the panel brilliance turns brighter and when [▼] key is

pressed, the panel brilliance will turn darker.

1 is for the darkest and 10 is for the brightest.

To close the menu, press [MENU] key .

For finer adjustment at 1 to 10 individually, point the cursor to the desired number of [Brill
Set] by [▲] or [▼] keys of while the [Panel Brill] box is on display.

] key is pressed, [LCD Brill] and [Panel Brill] are switched over.

] key is pressed, the [Panel Brill] box is displayed.

Press [ENT] key , and the box for [Brill Set] appears.

Point the cursor to the digit to be changed with [

The numeric value increases with [▲] key.

The numeric value decreases with [▼] key.

Press [ENT] key , and the value is set and returns to the [Panel Brill] box.

To close the menu after setup of the value, press [MENU] key .

] or [ ] keys of and:

0093101112-00 1-15

CVS-FX1 Chapter 2 Basic operation

Chapter 2 Basic operation

2.1 Switch screen images (Setting up of CM menu)

At setup of CM*
If the setup of CM Menu is registered in [CM] keys, there is no need to operate CM Menu at
every time of change of images. As for the details of [CM keys and the storing method into the
[CM] keys, please see “Chapter 3 To make the best of [CM] keys”, p 3 - 1.

The main setup items in this chapter at this point are as follows:

2.1.1 Display of 1-frequency/displays of 2-frequency and more

1

Menu, images on screen can be switched over.

 Display of normal images
 Change of frequency
 Display of zoom images
 Display of mixed images
 Selection of pulse length
 Selection of frequency bandwidth
 Selection of changing method of gain

CVS-FX1 can switch ON/OFF the display of 4-frequency images individually.
To select Standard Echo Display:

1. Press [CM] key used ([CM] key lit red)
When CM1 is lit red, press [CM1] key .

2. CM Menu is displayed.

3. Moving the cursor with key, select [Normal] or [OFF] of high frequency 1 in

Standard Echo Display items.

Standard Echo
Display items

When [Normal] is selected, normal images are displayed on high frequency 1 screen.
When [OFF] is selected, high frequency 1 screen is not displayed.

*1 CM (Condition Memory) : CM is the key to store the setting conditions of the echo sounder and to recall them by one

touch. There are 6 keys, CM1 to CM6, to store 6 types of setups.

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Chapter 2 Basic operation CVS-FX1

4. Press [ENT] key .

5. Moving the cursor with , select [Normal], [Mix] or [OFF] in the Standard Echo

Display items of high frequency 2, and press [ENT] key .

When [Normal] is selected, normal images are displayed on high frequency 2 screen.

When [Mix] is selected, mixed images are displayed on high frequency 2 screen. (As for
details, please see “2.1.4 Display of mixed images”, p 2-15)

When [OFF] is selected, no high frequency 2 screen is not displayed.

6. Moving the cursor with , select [Normal], [Mix] or [OFF] in the Standard Echo

Display items of low frequency 1 and press [ENT] key.

When [Normal] is selected, normal images are displayed on low frequency 1 screen.

When [Mix] is selected, mixed images are displayed on low frequency 1 screen. (As for
details, please see “2.1.4 Display of mixed images”, p 2-15)

When [OFF] is selected, no low frequency 1 screen is not displayed.

7. Moving the cursor with , select [Normal], or [OFF] in the Standard Echo Display

items of low frequency 2 and press [ENT] key .

When [Normal] is selected, normal images are displayed on low frequency 2 screen.

When [OFF] is selected, no low frequency 2 screen is not displayed.

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CVS-FX1 Chapter 2 Basic operation

2.1.2 Setting frequency to match the transducer to be used

On CVS-FX1, the frequencies used for 4 screens can be set in a range of 24 to 240 kHz. The
range of selectable frequency depends on the transducers connected.

At the time of the initial usage

In the case the other transducer than TDM-052 is with CVS-FX1 for the first time after
purchase, it is necessary to adjust setting of the transducer.

Factory default setting of CVS-FX1 is as follows: the type of transducer is TDM-052, high
frequency 1 is 200 kHz, high frequency 2 is 130 kHz, low frequency 1 is 75 kHz and low
frequency 2 is 38 kHz.

If the connected transducer is different from the factory default, the setting shall be performed
at first.

As for the setting of transducer, please see the Installation Manual “2.1 Setup of transducer”
of “Chapter 2 Adjustment”.

To change frequency:

1. Press [CM] key used (lights red).
When CM1 is lit red, press [CM1] key .

2. CM menu will be displayed.

3. Move the cursor to the position that indicates the frequency of high frequency 1 in

frequency display items using .

Frequency
display items

4. Press [ENT] key .

5. [Frequency] box is displayed.

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Chapter 2 Basic operation CVS-FX1

6. Increase or decrease the value with [▲] and [▼] key of to set frequency.
[▲] key: The numeric value increases.

[▼] key: The numeric value decreases.

When the key is kept pressed, the value automatically shifts to the upper digit.

7. Press [ENT] key .

8. Repeat the procedures 3 to 7 for frequencies on other screens.

Caution: When the other transducer than broadband type (TDM-052,

TDM-062) is connected, the transducer cannot perform the designated
specification if frequency setting exceeds the fixed range of the transducer.

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CVS-FX1 Chapter 2 Basic operation

Setting up of frequency:

1. Relation between a transceiver and display screen

For CVS-FX1, there are two types of transceiver for high frequency and low frequency,
and each transceiver has two channels of channel 1 and channel 2.

High frequency 1 is the channel 1 for high frequency.
High frequency 2 is the channel 2 for high frequency.
Low frequency 1 is the channel 1 for low frequency.
Low frequency 2 is the channel 2 for low frequency.

2. Limitation in setting of high and low frequencies:
In the case of a broadband transducer, the cable at high frequency side of the transducer
shall be connected to the high frequency terminal and the cable at low frequency side of
transducer shall be connected to low frequency terminal.
The frequency range to be set has the following limitations per transducer.

Name of transducer Frequency range

of low frequency

TDM-052 38 to 75 kHz 130 to 210 kHz
TDM-062 38 to 75 kHz 85 to 135 kHz

Caution: If the frequency setting exceeds the ranges above, gain will not be enough

to let the transducer perform to the designated specification.

Frequency range

of high frequency

When the other transducer than broadband type is connected, please connect the cable
for low frequency of the transducer to the low frequency terminal and the cable for high
frequency of the transducer to the high frequency terminal, and set the designated
frequency of the transducer.

3. Simultaneous transmission and reception*

1

and alternate transmission and reception*2
Two transceivers for high frequency and low frequency transmit and receive
simultaneously, and the channel 1 and channel 2 of each transceiver operate in alternate
transmission and reception.

4. When the same frequency is set for high frequencies 1 and 2 or low frequencies 1 and 2,
alternate transmission and reception do not operate. Transmission and reception are
performed by only channel 1 and the image is displayed using the channel 1 data by the
channel 2 gain setting.

5. The conditions when alternate transmission and reception can operate even when the
same frequency is set for channels 1 and 2:

 If pulse width is different
 If frequency bandwidth is different
 If range is different.
 If shift is different.
 If the types of display zoom is different.

*1 Simultaneous transmission and reception: Each transmitter and receiver for high frequency and low frequency

*2 Alternate transmission and reception: Channels 1 and 2 of high frequency and channels 1 and 2 of low frequency

0093101112-00 2-5

operates simultaneously.

transmit and receive alternately by each channel. The image scroll speed will drop
to a half of that of simultaneous transmission and reception

Chapter 2 Basic operation CVS-FX1

2.1.3 Displaying of zoom images

To display zoom images:

1. Press the [CM] key used (Lights red [CM] key).

When CM1 is lit red, press the [CM1] key .

2. The CM menu is displayed.

3. Moving the cursor with , select [OFF], [Bottom], [B.D.(Bottom Discrimination)],

[Zoom], [B.Z. (Bottom Zoom)] and [B.F.Z. (Bottom Follow Zoom)] for high frequency 1 of

Zoom Display items.

Zoom Display items

4. Press [ENT] key .

5. Repeat the procedures 3 and 4 for zoomed display of high frequency 2, low frequency1
and low frequency 2.

6. Press [CM1] key to close the CM menu ([CM] key lit red).

Configuration of zoomed image display：

The zoom image is displayed with normal image on the upper side of the screen and the
zoom image at the bottom side of the screen, except for the case of [B.Z.].
[Zoom range bar] is shown in orange on the side of the latest normal image, to indicate the
range of zoom image.
The screen width of zoom range can be changed by [MENU]. (for the details, see “To change
the screen Width of Zoom Image”, p 2 - 13)

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CVS-FX1 Chapter 2 Basic operation

Types of zoomed images

1. Bottom

Normal
images

Bottom images

Zoom range
bar

Sea bottom is fixed at 10% bottom of the screen, and the image above is displayed in the
specified zoom range. As the image on sea bottom is magnified, this is an effective
zooming mode to identify fish schools, etc. near the bottom.

Zoom range

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Chapter 2 Basic operation CVS-FX1

2. Bottom discrimination

Normal
images

Bottom
discrimination

Zoom range
bar

Sea bottom is fixed at 30% bottom of the screen, and the image of bottom is displayed in
the specified zoom range.

As the sea bottom image is magnified, this is an effective zoom mode to judge the sea
bottom condition.

Zoom range

Expanded range

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CVS-FX1 Chapter 2 Basic operation

3. Zoom

Normal
images

Zoom range
bar

Zoom
part

Specifying a shift position, the images under the position is displayed in the specified

zoom range.

As the zoomed image at the specified positions is displayed, this is an effective zooming

mode for the case when image at particular depth is required for fishing of alfonsino,
etc.

Start position of
zooming

Zoom range

As for operation of shift position of zooming, please see “To change the shift position of Zoom”,
p 2 - 12.

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Chapter 2 Basic operation CVS-FX1

4. Bottom zoom

Bottom zoom

Normal
images

Mixed images above bottom in a specified zoom range are displayed onto the normal
image.

This is an effective mode to identify fish schools, etc. near sea bottom with watching the
geomorphic changes of sea bottom.

Zoom range

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CVS-FX1 Chapter 2 Basic operation

g

5. Bottom follow zoom

Normal
images

Zoom range
bar

Bottom
follow
zoom

In a specified zoom range, the sea bottom is displayed by automatic shift to be displayed

within a range between 30 % and 90 % from the top of images

This is an effective zooming mode to determine the geomorphic changes of sea bottom.

Start position of
zooming

Zoom
ran

e

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Chapter 2 Basic operation CVS-FX1

To change the range of zoomed images

When the icon to show the mode of [Range] and [Shift] keys is in header display , the

range of the zoomed images can be changed.

1. When the icon of header display part is , press [NORMAL/ZOOM] key .

2. Check that the icon of the header display part is indicating zooming operation.

3. With [▲] of [RANGE] key , the range is changed to the zoom range in shallow side

and with [▼], the range turns to the zoom range in deep side.

To change the shift position of Zoom:

When the icon to show the mode of [RANGE] [SHIFT] keys in header display is , the shift
of zoomed images can be changed.

1. When the icon of header display is , press [NORMAL/ZOOM] key .

2. Check that the icon of header display is indication zooming operation.

3. With [▲] of [SHIFT] key , the zooming position shifts upward and with [▼] downward.

If the key is kept pressed, the digit moves upward changing the value.

The shift of zoom can be also changed by operation of [Shift Setup] [Zoom Shift Position] in
the main Menu.

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CVS-FX1 Chapter 2 Basic operation

Screen Width of Zoom Image:

The screen width of zoomed images can be changed to 3 steps of [Wide], [Medium] and

[Narrow] depending on preference.

<Examples of Width of Zoom Image (in the case of Bottom)>

Wide Medium Narrow

To change the screen Width of Zoom Image:

1. Press [MENU] key .

2. The menu is displayed. With [▲] or [▼] keys of , point the cursor to [Disp. Setup 1].

3. Press [

] key of .

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Chapter 2 Basic operation CVS-FX1

4. [Disp. Setup 1] of Menu is displayed. With [▲] or [▼] keys of , point the cursor to

[Width of Zoom Image].

5. Press [

] key of .

6. [Width of Zoom Image] is displayed. With [▲] or [▼] keys of , select [Wide],

[Medium] or [Narrow]

7. When [MENU] key is pressed, the menu disappears and the selected [Width of Zoom
Image] is set.

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CVS-FX1 Chapter 2 Basic operation

2.1.4 Display of mixed images

Mixed images are combination of high and low frequency images by signal processing. The
main purpose is to identify small fish, such as whitebait, from other fish school. There are 5
types for mixing methods and they are switchable in application.

Types of mixed images:

1. Mix type A
Images in high frequency and low frequency are compared. The red level signal indicates
high frequency images. For the signal at lower level than that, the high frequency signal is
displayed in gray color.
As fish schools with strong high frequency signal are highlighted, this is helpful for
identification of fish schools near own boat’s position.

2. Mix type B
Only when high frequency signal is stronger than low frequency signal, the low frequency
signal is subtracted from the high frequency signal, and the difference is displayed with
color gradation.
The images existing only in high frequency are highlighted.
Small fish such as whitebait can be displayed in high frequency, but not in low frequency.
This is helpful, therefore, for identification of schools of small fish.

3. Mix type C
Images in high frequency and low frequency are compared. The red level signal indicates
high frequency images. For the signal at lower level than that, only when the high
frequency signal is stronger than the low frequency signal, the low frequency is subtracted
from the high frequency and the difference is displayed with color gradation.
Strong signal with high frequency and images only in high frequency are highlighted.
This is helpful, therefore, for identification of fish school near own boat and school of small
fish such as whitebait.

4. Mix type D
Signals of images of high and low frequencies are compared, and the stronger signal is
displayed with color gradation.
This is completely combined image of high and low frequencies. Without viewing of each of
high and low frequencies images, only this one image can tell the conditions in water.

5. Fish size in fish school size
Comparing signals of high and low frequencies, only signal with higher level of high
frequency is displayed as difference in the order of strength, from red (strongest) to
greenish yellow with color gradation. Low frequency images are indicated in greenish
yellow to light blue with color gradation and the mixed image of them is displayed.
For example, when high frequency is 200 kHz, the wavelength of underwater acoustic
wave is 0.75 cm, and when low frequency is 50 kHz, the wavelength of underwater
acoustic wave is 3.0 cm. In the image of low frequency 50 kHz, fish smaller than 3 cm is
hardly detected.
As school of small fish such as whitebait is clearly displayed in high frequency signal with
short wavelength, only school of small size fish is displayed in warm color from red to
greenish yellow in fish school mode.
By this, it is easy to identify smaller size than 3.0 cm.

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Chapter 2 Basic operation CVS-FX1

To display mixed images:

1. Press [CM] key used (Lights red).

When CM1 is lit red, press it .

2. CM menu is displayed.

3. Moving cursor with , point the cursor to [Mix] of high frequency 2 or Low frequency 1

of Standard Echo Display items.

Standard Echo
Display

4. Press [ETN] key .

Caution: Mixing can be selected only when images at right and left sides of the

display screen are displayed. 3 types of mixed image are selectable: high
frequency 1 and low frequency 1 mixings, high frequency 1 and low frequency 2
mixings, and high frequency 2 and low frequency 2 mixings can be selected.

Caution: Mixed image cannot be displayed when range is set at [Scr. Individual] and

shift is set at [Scr. Individual], and when zoom display is at [Zoom], [B. Z.] and [B.
F. Z.], mixed image cannot be displayed.

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CVS-FX1 Chapter 2 Basic operation

To change the type of mixed image:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Disp. Setup1] with [▲] or [▼] keys of .

3. Press [

] key of .

4. [Disp. Setup1] of the menu is displayed. Move the cursor to [Mix] with [▲] and [▼] keys

of .

0093101112-00 2-17

Chapter 2 Basic operation CVS-FX1

5. Press [

] key of .

6. [Mix] of the menu is displayed. Move the cursor to the desired mix type with [▲] and [▼]

keys of to select.

7. Pressing [MENU] key , the menu disappears and the selected mix mode is set.

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CVS-FX1 Chapter 2 Basic operation

2.1.5 Selection of pulse length

Pulse length can be switched to 4 steps: of Short, Medium, Long and Fixed.

This change of pulse length causes changes in resolution of images from the echo sounder
and the signal to be displayed changes. Shorter pulse length increases resolution, but its
power decreases. Other way around, longer width decreases resolution but increases power.
By this nature, the pulse length is switched depending on the range: to Short (narrow) at
shallow range and to Long (wide) at deep range, except for the case of setting at [Fixed].

When pulse length is switched:

1. For the setup up of pulse length, based on the setup at [Medium] as reference, at [short],
the pulse length is switched to the same pulse length as [Medium] pulse length with 1/2 of
the range used, and at [Long], to the same pulse length as [Medium] pulse length with 1.5
times of the range used.

When signals in images of fish are not visible at the range used, setup at [Short] increases
small response, and setup at [Long] highlights larger response while decreasing small
responses.

2. When pulse length is set at [Fixed], the width is constant regardless of switching of range.
Please set at [Fixed], to avoid change of response from fish by switching of range.

To select pulse length:

1. Press [CM] key (lights red) used.
When CM1 is lit red, press [CM1] key .

2. CM menu is displayed.

3. Moving the cursor with , select [Short], [Medium], [Long] or [Fixed] of high

frequency 1 in Pulse Length items.

Pulse Length
item

0093101112-00 2-19

Chapter 2 Basic operation CVS-FX1

4. Press [ENT] key .

5. Repeat the procedures 3 and 4 above for pulse length of high frequency 2, low frequency 1
and low frequency 2

6. Press [CM1] key to close CM menu ([CM] key lit red).

Adjustment when [Fixed] for pulse length is selected:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor at [Manual Set] with [▲] or [▼] key of .

3. Press [

] key of .

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CVS-FX1 Chapter 2 Basic operation

4. [Manual Set] of menu is displayed. Move the cursor at [Pulse Length HF1] with [▲] or [▼]

keys of .

5. Press [

] of .

6. [Pulse Length HF1] of the menu is displayed. Move the cursor with [▲] or [▼] keys

of , and select one of [Short], [Medium] or [Long].

7. Press [SUBMENU] key to return the menu to [Manual Set].

8. To set the fixed value of the pulse length on the next screen, repeat the procedures 4 to 7.

9. Press [MENU] key of , the menu disappears and the selected fixed pulse length is
set.

Caution: The menu for [Manual Set] is available if [Pulse Length] of CM menu is

not set at [Fixed]

The pulse length when [Fixed] of pulse length is selected:

1. The pulse length is 210 μsec when setting of [MENU], [Manual Set] and [Pulse Length] is
[Short].

2. The pulse length is 1000 μsec when setting of [MENU], [Manual Set] and [Pulse Length] is
[Medium].

3. The pulse length is 3000 μsec when setting of [MENU], [Manual Set], and [Pulse Length] is
[Long].

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Chapter 2 Basic operation CVS-FX1

2.1.6 Selection of frequency bandwidth

Frequency bandwidth can be switched to 4 steps: Narrow, Medium, Wide and Fixed. The
change of frequency bandwidth results in change of the resolution of echo sounder and
change of signals in the displayed images. If the frequency bandwidth is wide, the resolution
becomes high. Other way around, if it is narrow, resolution becomes low.
By this nature, the frequency bandwidth is switched depending on the range: to wide at
shallow range and to narrow at deep range, except for the case of setting at [Fixed].

When frequency bandwidth is switched:

1. For the setup up of frequency bandwidth, based on the setup at [Wide] as reference, at
[Medium], the bandwidth is switched over to the same bandwidth of [Wide] bandwidth that
is 1.5 times of the range used, and at [Narrow], to the minimum bandwidth.
When size of target fish matches the frequency wavelength in use, setup up at [Medium] or
[Narrow] highlights the images and increase visibility. When pulse length is set at [Short]
and frequency bandwidth at [Narrow], response smaller than wavelength is reduced and
noise reduction effect is expected.

2. When frequency bandwidth is setup at [Fixed], the bandwidth is constant regardless of
switching of range.

To select frequency bandwidth:

1. Press [CM] key (lights red) used.
When CM1 is lit red, press [CM1] key .

2. CM menu is displayed.

3. Moving the cursor with , select [Narrow], [Medium], [Wide] or [Fixed] of high

frequency 1 in frequency bandwidth items.

Bandwidth items

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CVS-FX1 Chapter 2 Basic operation

4. Press [ENT] key .

5. Repeat the procedures 3 and 4 for frequency bandwidth of high frequency 2, low frequency
1 and low frequency 2

6. Press [CM1] key to close CM menu ([CM] key lights red).

Adjustment when the time of selection of [Fixed] of frequency bandwidth is set [Fixed]:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor at [Manual Set] with [▲] or [▼] keys of .

3. Press [

] key of .

0093101112-00 2-23

Chapter 2 Basic operation CVS-FX1

4. [Manual Set] of the menu is displayed. Move the cursor to [Bandwidth HF 1] with [▲] or [▼]

keys of .

5. Press [

] of .

6. [Bandwidth HF 1] of menu is displayed, Move the cursor with [▲] or [▼] keys of ,

and select [Narrow], [1], [2], [3], [4] or [Wide].

7. Press [SUBMENU] key of to return to [Manual Set].

8. Repeat the procedures 4 to 7 for setup of fixed bandwidth on the next screen.

9. Press [MENU] key of , and the menu disappears and the selected fixed bandwidth is
set.

Caution: The menu for [Manual Set] will not be available unless [Bandwidth] of CM

menu is set at [Fixed]

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CVS-FX1 Chapter 2 Basic operation

2.1.7 Selection of gain changing method

CVS-FX1 can display images up to 4 frequencies and gain can be adjusted for each images.
Adjustment of gain is individually done with two gain knobs after selecting of a screen to
adjust.
In addition, after having gain optimized individually for each screen, it is also possible to adjust
gain of all screens with operation of only one gain knob. This is synchronized gain.

In the synchronized gain, the whole gain varies while keeping the difference in gain of each
screen.

To select the changing method of gain:

1. Press [CM] key used ([CM] key lights red).

When CM1 is lit red, press [CM1] key .

2. CM menu is displayed.

3. Move the cursor with and select [Individual] [Synchronized] of [High Frequency 1] in
gain items.

Gain items

4. Press [ENT] key .

5. Press [CM1] key to close CM menu ([CM] key lit red).

As for the details of gain operation, see “2.2.5 Adjustment of image gain”, p 2 - 46.

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Chapter 2 Basic operation CVS-FX1

2.2 Adjustment of echo sounder

To use echo sounder, it is necessary to adjust depth range (Range) and gain depending on
the circumstances.

The main adjustment items are as follows:

 Switching Range mode
 Switching the role of range key to change of normal image range or zoom image

range

 Manual change of range
 Manual change of shift position
 Adjustment of image gain
 Setup of TVG

2.2.1 Switching of depth range mode

There are 3 types of Range Mode: [Auto Range], [Manual] and [Auto Shift].
[Auto Range] is the mode to automatically switch depth range so as to display sea bottom
constantly in a display screen.
[Manual] is the mode to manually switch depth range with range key operation, and shift with
shift key operation.
[Auto Shift] is the mode to automatically shift the preset depth range so as to display
constantly sea bottom in a display screen.

To switch [Range Mode]:

1. Keep [SHIFT/M OFF] key pressed until [Range Mode] menu is displayed.

2. Move the cursor with [▲] or [▼] keys of and select one of [Auto Range], [Manual] or

[Auto Shift]

3. Press [ENT] key . The selected Range mode is set.

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CVS-FX1 Chapter 2 Basic operation

When [Auto Range] is set, [Auto Range] is displayed in the header showing Range Mode.

When [Manual] is set, display of the header showing the Range Mode disappears.

When [Auto Shift] is set, [Auto Shift] is displayed in the header showing Range Mode.

As for the details of [Auto Range], see “4.3.2 Setting of auto range”, p 4 - 4.

As for the details of [Manual], see “2.2.3 Manual change of a range for normal image”, p 2 -

29.

As for the details of [Auto Shift], see “4.3.3 Setting of auto shift”, p 4 - 6

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Chapter 2 Basic operation CVS-FX1

2.2.2 Switching of Normal/Zoom for range and shift operation

The range key has two functions of “to change range of normal image” and “to change range
of zoomed image”, and the shift key has two functions of “to change shift of normal image”
and “to change shift of zoomed image”, respectively.

When Range mode is [Manual] or [Auto Shift] and zoomed image is displayed:

1. Press [NORMAL/ZOOM] key . Each time the key is pressed, the icon in the header

showing range key changes as follows:

2. When is shown, the range and shift of the normal image can be changed.

When is shown, the range of zoomed image and shift of zoomed image can be

changed.

Caution: is displayed only when a zoomed image is displayed.

When Range mode is [Auto Range]:

1. [Range] key can be used only for the change of range of zoomed images.

[Shift] key can be used only for change of shift of zoom.

Display of header

Caution: When Range mode is [Auto Range], icon is always displayed.

When the zoom screen is not on display, the key operation is invalid.

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CVS-FX1 Chapter 2 Basic operation

2.2.3 Manual change of a range for normal image

When Range mode is Manual, the range can be changed manually.

In manual range, each time range key is pressed range changes among the 8 ranges
registered.

In addition, at manual range, either all range of images of 4 frequencies can be changed with
[All Screens Same], or with [Scr. Individual] by image of each frequency.

To set up Range mode to [Manual]:

1. Keep [Shift/M OFF] key pressed until [Range Mode] menu is displayed.

2. Move the cursor with [▲] or [▼] keys of , and select [Manual].

3. Press [ENT] key . Then, [Manual] is set and turns to manual range and the header

showing the Range Mode disappears.

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Chapter 2 Basic operation CVS-FX1

Switching the range operation to “Change with [All Screens Same]” or to “Change with
[Scr. Individual]:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Range Setup] with [▲] or [▼] keys of .

3. Press [

] of .

4. [Range Setup] of menu is displayed. Move the cursor to [Range Operation] with [▲] or [▼]

of .

5. Press [

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] key of .

CVS-FX1 Chapter 2 Basic operation

6. [Range Operation] of menu is displayed. Moving the cursor with [▲] or [▼] keys of ,

select [All Screens Same] or [Scr. Individual].

7. When [MENU] key is pressed, the menu disappears and the setup of range operation
is complete.

Icon showing the range condition in header changes as follow:

All Screens Same range Scr. Individual range

0093101112-00 2-31

Caution: When [Scr. Individual] range is set, the speed of [Image Speed] will be

the speed of the deepest range set.

Chapter 2 Basic operation CVS-FX1

To register ranges:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Range Setup] with [▲] or [▼] keys of .

3. Press [

] of .

4. [Range Setup] of the menu is displayed. Move the cursor to [Range1] with [▲] or [▼] keys

of .

5. Press [

2-32 0093101112-00

] key of .

CVS-FX1 Chapter 2 Basic operation

6. [Range1] of the menu is displayed. Set range by increasing or decreasing numeric value

with [▲] or [▼] keys of .

・ The numeric value increases with [▲] key.
・ The numeric value decreases with [▼] key.

When the key is kept pressed, the value automatically shifts to the upper digit.

7. When [SUBMENU] key is pressed, the menu returns to [Range Setup].

8. For setup of the next range registration, the procedures 4 to 7 shall be repeated.

9. When [MENU] key is pressed, the menu disappears and range registration is
complete.

Hint: It is recommended to assign smaller number to shallow range and larger
number to deeper range. If so arranged, range key can be operated in such a way
[▲] is for shallow direction and [▼] for deeper direction.

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Chapter 2 Basic operation CVS-FX1

To change ranges:

1. When the header display is , range of normal images can be changed.

If the header display is , press [NORMAL/ZOOM] key to turn to .

2. When [▲] of [RANGE] key is pressed, the No. of the registered range turns one

number smaller.
When [▼] is pressed, the No. turns one number larger.

When the range is changed, the range change box is displayed on the screen for 5 seconds.

<Examples of display>

50 m

Range change box

Range value
changes

Shallow depth range Deep depth range

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CVS-FX1 Chapter 2 Basic operation

To switch the operation screen for individual range:

1. At the left bottom corner of each screen, nothing is shown, or [Gain knob icon] of

(red) or (green) is displayed.

The range operation can be performed on the screen where [Gain knob icon]

(red) is displayed.

(Red) (Green)

Gain knob icon

2. To switch over [Gain knob icon] to (red), keep pressing [GAIN-L/SEL] at

left side, and [GAIN-R/SEL] at right side pressed until [Gain knob icon] turns to

(red).

3. [Range] key is pressed, the range of the screen with [Gain knob icon]

(red) changes.

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Chapter 2 Basic operation CVS-FX1

2.2.4 Manual change of shift positions of normal images

When Range Mode is set at manual, shift can be changed manually.
In the manual shift, there are two ways: one is to change shift positions of 4-frequency images
with [All Screens Same] and another is to change images per frequency with [Scr. Individual].
The manual shift can be switched over among 4 types of shift types, [Numeric Value], [Range
Dependant], [Preset Value] and [Range Ratio].
In [Numeric Value], the shift value is changed directly.
In [Range Dependant], the shift value is changed to the most appropriate shift value specified
per range.
In [Preset Value], each time shift key is pressed, 8 registered shift values switch in sequence.
In [Range Ratio], the shift value changes at every 1/5 of a range.

In addition, if [Shift digit input] is set at [F1] key or [F2] key , shift operation with a

specified digit of shift value can be performed regardless of the operation mode above.

To set Range Mode at [Manual]:

1. Keep [SHIFT/M OFF] key pressed until [Range Mode] menu is displayed.

2. Move the cursor with [▲] or [▼] keys of to select [Manual].

3. Press [ENT] key . The mode is set at [Manual] and turns in manual shift.

The header showing Range Mode disappears.

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To switch shift operation into “Changes with [All Screens Same] “or “Change with [Scr.
Individual]”:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Shift Setup] with [▲] or [▼] keys of .

3. Press [

] of .

4. [Shift Setup] of the menu is displayed. Move the cursor to [Shift Operation] with [▲] or [▼]

keys of .

5. Press [

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] key of .

Chapter 2 Basic operation CVS-FX1

6. [Shift Operation] of the menu is displayed. Move the cursor with [▲] or [▼] keys of

and select [All Screens Same] or [Scr. Individual].

7. Press [MENU] key , and the menu disappears and the setup of shift operation is
complete.

The icon showing the shift conditions in header display changes:

All Screens Same Scr. Individual

Caution: When [Scr. Individual] is set, the speed of [Image Speed] turns to the speed of

the deepest shift.

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To switch over the shift operation type:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Shift Setup] with [▲] or [▼] keys of .

3. Press [

4. [Shift Setup] of the menu is displayed. Move the cursor to [Shift Type] with [▲] or [▼] keys

of .

] of .

5. Press [

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] of .

Chapter 2 Basic operation CVS-FX1

6. [Shift Type] of the menu is displayed. Move the cursor with [▲] or [▼] keys of

and to select one of [Numerical Value], [Range Dependant], [Preset Value] or [Range

Ratio].

7. Press [MENU] key , and the menu disappears and the setup of shift type is
complete.

Details of shift type:

1. Numeric Value

Each time shift key is pressed, the numeric value of shift changes.

When [▲] of [Shift] key is pressed, it shifts to the shallower direction.

When [▼] of [Shift] key is pressed, it shifts to the deeper direction.

With one press of the shift key, the digit of 1 of shift changes.
When shift key [▼] is kept pressed, the digit of 1 increases in sequence and after 9 it shifts

up to the digit of 10. If it is kept pressed further, the digit of 10 increases up to 90 in
sequence and then shifts up to the digit of 100. If the key is kept pressed, the digit of 100
increases in sequence. After that, even in case of beyond the digit of 1000, the digit of 100
increases.

When shift key [▲] is kept pressed, the digit of 1 decreases in sequence and after 0 it shifts
up to the digit of 10. If it is kept pressed further, the value decreases down to 00 and shifts
up to the digit of 100. If the key is kept pressed, the digit decreases. After this, only the digit
of 100 decreases even in case of beyond the digit of 1000. When a digit shifts, the value
decreases in sequence in one lower digit.

Keep pressing the key up to a just before the intended shift value, release once from the
key and press it again. Repeat this operation until it can shift to the intended depth.

2. Range Dependant

Shift value varies for each range as described the following table.

Range Shift value

1 ~ 7.5 m 1 m
10 ~ 20 m 2 m
25 ~ 40 m 5 m
50 ~ 90 m 10 m

100 ~ 240 m 20 m
260 ~ 450 m 50 m

500 ~ 900 m 100 m
1000 ~ 2400 m 200 m
2600 ~ 3000 m 500 m

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CVS-FX1 Chapter 2 Basic operation

3. Preset Value

Total 8 shifts preset from [Main Menu], [Shift Setup], [Shift Preset1] to [Shift Preset8] can be
switched each time shift key is pressed.

When [▲] of [Shift] key is pressed, the shift changes to the registered range
with one number smaller.

When [▼] of [Shift] key is pressed, the shift changes to the registered range
with one number greater.

This is an effective type of shift in the case where a constant shift value is specified
depending on fishing.

4. Range Ratio

Independent of the range, it can shift at approximately 1/5 unit for the whole range:

1/5

1/5

1/5

To register shift:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Shift Setup] with [▲] or [▼] keys of .

3. Press [

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] key of .

Chapter 2 Basic operation CVS-FX1

4. [Range Setup] of the menu is displayed. Move the cursor to [Shift Preset1] with [▲] or [▼]

keys of .

5. Press [

] key of .

6. [Shift Preset1] of the menu is displayed. Set the range by increasing/decreasing of the

numeric values with [▲] or [▼] keys of .

With [◄] key, the digit can be moved to larger side.
With [

key, the digit can be moved to smaller side.

►]
With [▲] key, the numeric value increases.
With [▼] key, the numeric value decreases.

7. When [SUBMENU] key is pressed, the menu returns to [Shift Setup].

8. To set the next shift preset, repeat the procedures 4 to 7.

9. Press [MENU] key , and the menu disappears and the shift preset is complete.

Hint: It is recommended to assign smaller number to shallow shift and larger
number to deeper shift. If so arranged, shift key can be operated in such a way [▲]
is for shallow direction and [▼] for deeper direction.

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To change shift:

1. When the header display is , shift of normal images can change.

When the header display is , press [NORMAL/ZOOM] key to turn to .

2. When [▲] of [Shift] key is pressed, it shifts to shallow direction.

When [

▼] of [Shift] key is pressed, it shifts to deep direction.

In the case [Shift Type] is [Preset Value]:

When [▲] of [Shift] key is pressed, the range changes to the registered range with
one number smaller.

When [

▼] of [Shift] key is pressed, the range shifts to the registered

range with one number greater.

When the shift is changed, a shift change box is displayed for 5 seconds at the upper side of
the shift scale.

10

Shift change box

Shift value
(start point)

Move display
range up and
downward

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Chapter 2 Basic operation CVS-FX1

To switch ON/OFF of shift:

1. Each time [SHIFT/M OFF] key is pressed , the shift is switched on or off.

The icon showing the shift conditions in header display changes:

Shift at [All Screens Same] : ON Shift : [OFF]

Shift at [Scr. Individual] : ON

Icon for shift status

To switch the operation screen for screen individual shift:

1. At the lower left side of each screen, nothing is displayed or [Gain knob icon] of

(red) or (green) is displayed.

Range operation can be performed on the screen where [Gain knob icon] (red) is
displayed.

(red)

(green)

Gain knob icon

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CVS-FX1 Chapter 2 Basic operation

2. To turn [Gain knob icon] to (red), press [GAIN-L/SEL] for the left screen and

[GAIN-R/SEL] for the right screen until [Gain knob icon]

turns (red).

3. When [Shift] key is pressed, [Gain knob icon] turns to (red) shift.

[Shift Synchronized] (Shift digit input) by [F1]/[F2] key

1. If [Shift Synchronized] is set on [F1] key or [F2] key , shift can be changed in
values regardless of the setup of [Shift Type].

As for the setup on [F1]/[F2] keys, please see “4.2.2 Assign intended operations to function
keys ([F1]/[F2])”, p 4 - 2.

2. Press [F1] key or [F2] key .

[Shift Synchronized] box is displayed:

3. Set range by increasing/decreasing numeric values with [▲] or [▼] keys of .

The digit can be larger with [ ] key.
The digit can be smaller with [

] key.

The value increases with [▲] key.
The value decreases with [▼] key.

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Chapter 2 Basic operation CVS-FX1

2.2.5 Adjustment of image gain

On CVS-FX1,gain of 4-frequency images can be adjusted individually.
For gain adjustment, there are two modes: individual mode and synchronized mode. In the
individual mode, the gain is adjusted individually on a selected operation screen. In
synchronized mode, the gain on all screens are adjusted all together by one gain adjustment
knob after gain adjustment is optimized individually for each screens.
In the synchronized gain, the gain of all screens change keeping the gain difference between
screens.
On CVS-FX1, the gain of all screens including images in the past changes by operation of the
gain knobs. Also, it can be switched to a mode in which only the gain of the current image
changes, to watch changes by the gain operation.

If the gain is increased too much, there is too much noise to make distinctions with signs of
fish.
If the gain is decreased too much, images and fish signs become too faint to distinguish.

Adjust the gain to your preference while watching the image.

<Example of gain adjusted images>

Too low Appropriate Too high

For gain adjustment (individual) per screen:

1. At CM1, press [CM1] key (lights red [CM1] key)

2. CM menu is displayed. Point the cursor to “Individual” of gain item with .

Gain item

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CVS-FX1 Chapter 2 Basic operation

3. Press [ENT] key .

4. Press [CM1] key (lights red [CM] key) to close CM menu.

For adjustment of gain per screen (individually):

 In the case of single frequency screen:

Regardless of frequency, operate with [GAIN-R/SEL] .

If [GAIN-R/SEL] is turned to right, the gain increases, and the gain decreases if

turned to left. The gain knob at the left side is invalid.

 In the case of dual frequency screen:

The gain for the left side screen is operated with [GAIN-L/SEL]

and the right side with [GAIN-R/SEL] .

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Chapter 2 Basic operation CVS-FX1

When [GAIN-L/SEL] or [GAIN-R/SEL] are turned to right, the gain

increases, and when turned to left, the gain decreases.

 In the case of 3-frequency screen:

Regardless of frequency, the gain at left side screen is operated with [GAIN-L/SEL] ,

and the gain at the center screen and the right side screen are operated with

[GAIN-R/SEL] .

The gain can be adjusted of the screens on which (red) or (green) [Gain
knob icon] on the lower left of screen are displayed.

When [GAIN-L/SEL] and [GAIN-R/SEL] are turned to right, the gain

increases and when turned to left the gain decreases.

To switch gain adjustment at the center and the right side, press [Gain-R/SEL]

until [Gain knob icon] (red) appears on the lower left of the aimed screen.

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 In the case of 4-frequency screen:

Regardless of frequency, the gain of two left screens (Low frequency 2/Low frequency 1) is

operated with [GAIN-L/SEL] and the gain of two right screens (High frequency 2/

High frequency 1) with [GAIN-R/SEL] .

The gain can be adjusted of the screen in which [Gain knob icon] of (red) or

(green) is shown at the lower left of screen.

If [GAIN-L/SEL] or [GAIN-R/SEL] is turned to the right, the gain increases,

and if turned to the left the gain decreases.

To switch the gain adjustment at left side (Low frequency 2/Low frequency 1), press

[GAIN-L/SEL] until [Gain knob icon] of (red) appears at the lower left of the

aimed screen.

To switch the gain adjustment at right side (High frequency 2/High frequency 1), press

[GAIN-R/SEL] until [Gain knob icon] of (red) appears at the lower left of the

aimed screen.

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Chapter 2 Basic operation CVS-FX1

To adjust the gain:

The gain can be adjusted on the screens on which [Gain knob icon] of (red) or

(green) is displayed at the lower left.

When gain knob is not displayed on the lower left of the screen of which the gain is intended

to be adjusted keep [GAIN-L/SEL] pressed for the left side (Low frequency 2/Low

frequency 1) and [GAIN-R/SEL] for right side (High frequency 2/High frequency 1) until

[Gain knob icon] of (red) appears at the lower left of the aimed screen.

When [GAIN-L/SEL] is turned to the right in the left screen (Low frequency 2/Low

frequency 1) or [GAIN-R/SEL] in the right screen (High frequency 2/High frequency 1),

the gain increases, and when turned to the left, the gain decreases.

When the gain knob is turned, gain adjustment box is displayed in the applicable operation
effective screen and gain value is indicated. The numeric value and the progress bar increase
or decrease depending on the operation.

At the same time, indication of gain values of the corresponding screen also
increases/decreases in the header display also increases or decreases.

<Indication of gain values in header display>

L2: L1: H2:
Low frequency2 Low frequency1 High frequency2

Caution: The gain adjustment box automatically disappears after 5 seconds from

completion of operation. It also disappears when the menu key is pressed.

The gain value per screen is reflected in the header display.

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CVS-FX1 Chapter 2 Basic operation

For gain adjustment of all screens at the same time (synchronized):

1. At CM1, press [CM1] key (Lights red [CM] key).

2. CM menu is displayed. Move the cursor to [Synchronized] of the Gain item with .

Gain item

3. Press [ENT] key .

4. Press [CM1] key to close CM menu (lights red [CM] key)

At synchronized gain, operation of one gain knob can change the gain for maximum 4 screens
(8 screens including zoom) at the same time, by increasing/decreasing with the same change
step, from the gain of each screen set individually.

When gain is set in [Synchronized], [Gain knob icon] (red) at the lower side of
screens will turns to (red).

(red) indicates the screen where VRM operation is valid and when TVG is assigned
to [F1/F2] keys.

To switch the active screens for VRM and [F1]/[F2] keys, press [GAIN-L/SEL]

for left screen, [GAIN-R/SEL] for right screen.

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Chapter 2 Basic operation CVS-FX1

For gain adjustment of all screens at same time (synchronized):

1. If [GAIN-L/SEL] or [GAIN-R/SEL] is turned, the [Synchronized Gain] box is
displayed.

This [Synchronized Gain] box indicates amount of change in ± value commonly given to
the gain individually set per each screen.

2. If [GAIN-L/SEL] or [GAIN-R/SEL] is turned to the right, the gain increases,

and if turned to the left, the gain decreases.

The gain of all screens can be changed simultaneously taking the gain of each screen as
reference.

Caution: Synchronized gain adjustment box disappears automatically after 5

seconds from the completion of operation. It also disappears by pressing of
the menu key.

The values of gain per screen plus the adjusted value of synchronized gain is indicated in
the header display

<Example of indication>

Changing the synchronized gain to 1.0

L2: L1: H2:
Low frequency2 Low frequency1 High frequency2

L2: L1: H2:
Low frequency2 Low frequency1 High frequency2

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Types of gain change:

There are two types of gain change when gain adjustment is done with a gain knob. One is
that the gain of all screens including images in the past is changed and the other is that only
the gain of the current mages is changed.

<Examples of images of gain change types>

Gain 3 Gain5 Gain 10 Gain 3 Gain5 Gain 10

All screens Current images only

To switch over change type of gain:

1. Press [SUBMENU] key .

2. The SUBMENU is displayed. Move the cursor to [System] with [▲] or [▼] keys of .

3. Press [

0093101112-00 2-53

] key of .

Chapter 2 Basic operation CVS-FX1

4. [System] of the SUBMENU is displayed. Move the cursor to [Gain Type] with [▲] or [▼]

keys of .

5. Press [

] key of .

6. [Gain Type] of the SUBMENU is displayed. Move the cursor to [Retractive Gain] or [Current

Image] with [▲] or [▼] keys of .

7. Press [MENU] key , and the SUBMENU disappears and the selected [Gain Type] is

set.

Caution: When the Gain Type is switched, the color of the past images changes. This

is because that the display method of images for the switched gain type and that
of previous type are different.
After scroll of one screen, normal images will be on display.

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2.2.6 Adjustment of TVG

The reflected signals of echo sounder have less sensitivity due to attenuation, as depth is
deeper.

This means that the same fish schools at shallower positions are displayed stronger and
those at deeper positions are displayed weaker.

TVG is the function, according to the characteristics of ultrasonic sound, to correct the
reflected signals attenuated according to their depth and to equalize the gain of the images
along the change of depth.

In the range of depth where TVG function is effective, fish schools of the same size can be
displayed with the same sensitivity even when their depth is different.

Method of TVG can be switched over between [Optimized] and [Manual].

[Optimized] is the mode with gain correction depending on the depth, based on the correction
curve optimized by diffusional attenuation and absorption attenuation depending on frequency
of ultrasonic.

[Manual] is the mode to adjust the setting of [Strength], [Depth] and [Adjust] to fit the images to
preference.

To switch between [Optimized] and [Manual]:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [TVG] with [▲] or [▼] keys of .

3. Press [

0093101112-00 2-55

] key of .

Chapter 2 Basic operation CVS-FX1

4. [TVG] of the menu is displayed. Move the cursor to [TVG Type] with [▲] or [▼] keys

of .

5. Press [

] of .

6. [TVG Type] of the menu is displayed. Move the cursor and select [Manual] or [Optimized]

with [▲] or [▼] keys of .

7. Press [MENU] key , and the menu disappears and the selected TVG is set.

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To use of optimized TVG:

 Optimized TVG corrects the reflected signal from shallower than the [Depth] where color is

produced with maximum level. This is done by having room for gain adjustment, in
reference to the diffusional attenuation and absorption attenuation of ultrasonic sound.

 By optimized TVG, unnecessary reflection such as noise is eliminated, and necessary

reflection from single fish and fish schools is clearly displayed at the same sensitivity
regardless of their depth.

 As optimized TVG always corrects optimized TVG, no adjustment is basically needed. Only

fitting to a desired gain with a gain knob is required.
However, when it is felt that the gain is short due to the excess correction of TVG for
shallower range, please adjust to a desired gain by changing the [Adjust].

<Example of optimized TVG images>

Without TVG Optimized TVG

When adjustment is needed due to excess TVG correction for shallower range:

There are two ways of TVG adjustment: to adjust in the main menu and to assign [F1]/[F2]
keys to adjust by the function keys.

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Chapter 2 Basic operation CVS-FX1

To adjust TVG Adjust in main menu:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [TVG] with [▲] or [▼] keys of .

3. Press [

] key of .

4. [TVG] of the menu is displayed. Move the cursor to [TVG Adjust HF1] with [▲] or [▼] keys

of .

5. Press [

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] key of .

CVS-FX1 Chapter 2 Basic operation

6. [TVG Adjust HF1] of the menu is displayed. Set [TVG Adjust HF1] by increasing and

decreasing the numeric value with [▲] or [▼] keys of .

With [▲] key, the value increases.
With [▼] key, the value decreases.

7. Press [SUBMENU] key to return to [TVG].

8. To set the next [TVG Adjust HF2], repeat the procedures 4 to 7.

To adjust TVG Adjust with [F1]/[F2] keys:

1. At first, assign [MENU] key or [F2] key with [TVG].

As for the setup method of [F1]/[F2] keys, see “4.2.2 Assign intended operation to function
keys ([F1]/[F2])”, p 4 - 2.

2. Press [F1] key or [F2] key .

3. The [TVG Adjust XXX] box is displayed.

4. Select the screen for adjustment of TVG.

When the left hand screen is to be selected, press [GAIN-L/SEL] , and when the

right hand screen is to be selected, press [GAIN-R/SEL] to show [Gain knob

icon] blinking at the lower left on the screen to be operated.

The title display of [TVG Adjust XXX] box changes to [TVG Adjust LF1] [TVG Adjust LF2] or
[TVG Adjust HF1] [TVG Adjust HF2].

Caution: [Gain knob icon] at the lower left of the screen changes to (red) when

gain setting is [Individual] and to (red) when [Synchronized].

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Chapter 2 Basic operation CVS-FX1

5. Adjust the numeric value with [▲] or [▼] keys of to set [TVG Adjust HF1].

With [▲] key, the value increases.
With [▼] key, the value decreases.

6. Press [SUBMENU] key or [MENU] key , and [TVG Adjust XXX] box
disappears.

Caution: [TVG Adjust XXX] box automatically disappears 5 seconds after release

To adjust with manual TVG:

There are two ways of TVG adjustment: to adjust in the main menu and to assign [F1]/[F2]
keys to adjust by the function keys.

of a key.

<Examples of manual TVG images>

Without TVG Manual TVG

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To manually adjust TVG in main menu:

1. Press [MENU] key .

2. The main menu is displayed. Move the cursor to [TVG] with [▲] or [▼] keys of .

3. Press of [

] key of .

4. [TVG] of the menu is displayed. Move the cursor to [TVG Strength HF1] with [▲] or [▼]

keys of .

5. Press [

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] key of .

Chapter 2 Basic operation CVS-FX1

6. [TVG Strength HF1] of the menu is displayed. Increase or decrease the numeric value with

[▲] or [▼] keys of to set [TVG Strength HF1].

With [▲] key, the value increases.
With [▼] key, the value decreases.

7. Press [SUBMENU] key to return to [TVG].

8. Point the cursor to [TVG Depth HF1] with [▲] or [▼] keys of .

9. Press [

] key of .

10. [TVG Depth HF1] of the menu is displayed. Set [TVG Depth HF1] by increasing or

decreasing the numeric value with [▲] or [▼] keys of .

With [▲] key, the value increases.
With [▼] key, the value decreases.

11. Press [SUBMENU] key to return to [TVG].

12. Point the cursor to [TVG Adjust HF1] with [▲] or [▼] keys of .

13. Press [

] key of .

14. [TVG Adjust HF1] of the menu is displayed. Set [TVG Adjust HF1] by increasing or

decreasing the numeric value with [▲] or [▼] keys of .

With [▲] key, the value increases.
With [▼] key, the value decreases.

15. Press [SUBMENU] key to return to [TVG].

16. For setting of the next TVG, repeat the procedures 4 to 15.

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To manually adjust TVG with [F1]/[F2] keys:

1. At first, assign [MENU] key or [F2] key with [TVG].

As for the setting method of [F1]/[F2] keys, see “4.2.2 Assign intended operation to function
keys ([F1]/[F2])”, p 4 - 2.

2. Press [F1] key or [F2] key .

3. TVG adjustment box is displayed.

Each time [F1] key or [F2] key is pressed, the TVG adjustment box will switched over
among [TVG Strength], [TVG Depth] and [TVG Adjust]. Select the intended item.

[TVG Strength] [TVG Depth] [TVG Adjust]

4. Select the screen to perform TVG adjustment.

When the screen at the left side is selected, press [GAIN-L/SEL] , and when the

screen at the right side is selected, press [GAIN-R/SEL] to make (red)

blinking at the lower left of the screen to be adjusted.

The title display of TV adjustment box will change to [TVG XX LF1] and [TVG XX LF2], or
[TVG XX HF1] and [TVG XX HF2].

Caution: [Gain knob icon] at the lower left of the screen changes to (red) when

gain setting is [Individual] and to (red) when [Synchronized].

5. In the case of [TVG Strength HF1], set [TVG Strength HF1] by increasing and decreasing

the numeric value with [▲] or [▼] keys of .

With [▲] key, the value will increase
With [▼] key, the value will decrease

6. Press [SUBMENU] key or [MENU] key , and [TVG Strength XXX] box
disappears.

Caution: [TVG Strength XXX] box automatically disappears 5 seconds after

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Chapter 2 Basic operation CVS-FX1

7. In the case of [TVG Depth HF1], set [TVG Depth HF1] by increasing or decreasing the

numeric value with [▲] or [▼] keys of .

With [▲] key, the value increases.
With [▼] key, the value decreases

8. Press [SUBMENU] key or [MENU] key , and [TVG Depth XXX] box
disappears.

Caution: [TVG Depth XXX] box automatically disappears 5 seconds after release

of a key.

9. In the case of [TVG Adjust High 1], set [TVG Adjust HF1] by increasing or decreasing the

numeric value with [▲] or [▼] keys of .

With [▲] key, the value increases.

With [▼] key, the value decreases.

10. Press [SUBMENU] key or [MENU] key , and [TVG Adjust XXX] box

disappears.

Caution: [TVG Adjust XXX] box automatically disappears 5 seconds after release

of a key.

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(Dep

)

To manually correct TVG:

The reflected signals of echo sounder have less sensitivity due to attenuation, as depth is
deeper.
In the TVG correction for CVS-FX1, a reference point of depth for correction is to be
determined. This reference point is [TVG Depth].
Reflected signals from a shallower depth than this reference point are corrected to have the
same sensitivity as that of the reference point.
In [Strength], the amount of change in this correction is set. The larger the value of [Strength]
becomes, the larger the amount of change becomes. (See the figure below)
For reflected signals from shallower positions, amount of correction becomes larger. When
[Strength] is set large, the correction amount for shallow depth may seem too much. In such
cases, if the [Adjust] is set at the depth at which correction seems too much, the correction
amount at shallower depth than the depth becomes the same as the correction amount at the
starting position, and can set off the over correction.

Setting should be performed in combination of the items above.

Adjustment of TVG strength of manual TVG:

[TVG Strength] decides the amount of change for TVG correction. The larger the value of
[TVG Strength] is, the bigger the amount of change is.

Change in TVG correction by change in strength

0

0

10 20 30 40 50

th 140 m/Adjust 1 m

TVG correction (-dB)

20

40

60

Depth (m)

80

100

1
5
10
15
20
25
30
35
40
45
50

120

140

The far left side line is Strength 1 and the far right side line is Strength 50 in the graph.

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Chapter 2 Basic operation CVS-FX1

Adjustment of TVG Depth of manual
TVG

[TVG Depth] is the reference point of depth
for correction. The deeper the setup
becomes, the wider the correction range
becomes.

Change in TVG correction by change in depth

0

0

20

(Strength 50/Adjust 1 m)

TVG correction (-dB)

10 20 30 40 50

40

60

Depth (m)

80

140m
120m
100m
80m
60m
40m
20m

Adjustment of TVG Adjust (start point)
of manual TVG

[TVG Adjust] adjusts the excessive
correction by TVG against shallow signals,
making the amount of correction at the
point shallower than the start point to be
the same correction amount at the start
point.

Change in TVG correction by change in adjust

0

20

40

60

Depth (m)

80

(Strength 50/Depth140m)

0

TVG correction (-dB)

10 20 30 40 50

60m
50m
40m
30m
20m
10m
1m

100

120

140

The far left line is at correction depth 20
m, and the line at far right is at correction
depth 140 m in a graph.

100

120

140

The far left line is at correction depth 60 m,
and the line at far right is at correction depth
1 m in a graph.

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1

2.3 Changing of the image scroll speed

The image scroll speed can be changed at 10 steps of [Speed 1], [Stop], [Speed 2], • • •
[Speed 9]. The larger the speed number is, the slower the image scroll speed becomes.

The image scroll speed of echo sounders is faster for shallow ranges and slower for deeper
ranges depending on the display ranges.

When the image speed at shallow ranges seems too fast, [Image Speed] is used to make the
speed slower.

When sea bottom is bedrock and has strong reflection strength, the multipath reflection
between seawater surfaces remains as reverb and may display false image*

1

. To eliminate

the false images, the image scroll speed may be slowed down to wait the next transmission

and reception until the reverb disappears.

The scroll of images can be stopped.

It is possible to enlarge images by 2 times and double speed of scroll.

To change image scroll speed:

1. Press [Image Speed] key .

[Image Speed] adjustment box is displayed.

To speed up image scroll speed:

1. While [Image Speed] adjustment box is displayed, press [Image Speed] key .

Move upward the cursor, and [Image Speed] is set to a faster speed.

*

False image: When sea bottom material is bedrock with high reflection ratio of ultrasonic sound, the reflected signals at

the sea bottom are reflected by the seawater surface and again by the sea bottom. This may be repeated
many times. This repeat of reflection remains as reverb. If the reverb remains at the next transmission and
reception, the image is a mixture with normal reflection and the reverb. This reverb is called as false
images.

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Chapter 2 Basic operation CVS-FX1

To stop image scroll:

1. While [Image Speed] adjustment box is displayed, move the cursor to [Stop] with [▲ ] key

of .

When the cursor is at [Speed 2 (1/1)], press [Image speed] key , and the cursor
moves to [Stop].

To slow down image scroll speed:

1. While [Image Speed] adjustment box is displayed, move the cursor downward with [▼] key

of , and [Image Speed] is set to a slower speed.

To wipe out false images:

1. While [Image Speed] adjustment box is displayed, move the cursor one step down with [▼]

key of to observe images.

While false images remain, move the cursor one more step down and observe the image.

Repeat this operation and adjust the image speed by making slower until the false images

disappear.

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CVS-FX1 Chapter 2 Basic operation

2.4 Finding out depth of targets in images (VRM operation)

VRM (Variable Range Marker) is a mobile marker to measure the depth of targets such as fish

schools, and indicates lines and depth values of the lines.

This can be also used as an indication of depth for casting net, etc.

VRM can display the second VRM set at a certain interval under the first VRM. This second
VRM follows the movement of the first one with the interval. This can be used as a measure
for depth of casting net.

There are two modes: to display on only one screen of the 4 frequencies and to display across
the all 4 screens.

In the display on the whole screen mode, the same depth is indicated on all screens at
synchronized range/shift. Display and operation can be done on each screen at individual
range/shift.

<Example of display VRM on specific screen>

VRM 1 line VRM VRM 2 lines VRM

<Example of display of VRM whole screen (All screens same range)>

VRM one line VRM VRM 2 lines VRM

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Chapter 2 Basic operation CVS-FX1

<Example of display of VRM whole screen (Screen individual range)>

VRM 1 line VRM 2 lines

2.4.1 Changing of VRM follow interval

Under the first VRM, another VRM with interval can be displayed. This VRM follows the
movement of the first VRM keeping the interval, and this is intended to use as a guidance of
depth for casting a net.

To change the displayed interval of the second VRM:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Display Setup 2] with [▲] or [▼] keys of .

3. Press [

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] key of .

CVS-FX1 Chapter 2 Basic operation

4. The menu [Disp. setup 2] is displayed. Move the cursor to [VRM Interval] with [▲] or [▼]

keys of .

5. Press [

] key of .

6. The menu [VRM Interval] is displayed. Set an interval by increasing or decreasing a

numeric value with [▲] or [▼] keys of .

With [ ] key, the digit can be moved to larger side.
With [

] key, the digit can be moved to smaller side.

With [▲] key, the value increases.
With [▼] key, the value decreases.

7. Press [MENU] key , and the menu disappears and the selected VRM follow interval
is set.

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Chapter 2 Basic operation CVS-FX1

2.4.2 Operation of VRM in Active Screen

To switch VRM display to Active Screen:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Disp. Setup 2] with [▲] or [▼] keys of .

3. Press [

] key of .

4. The menu [Disp. Setup2] is displayed. Move the cursor to [VRM Image] with [▲] or [▼]

keys of .

5. Press [

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] key of .

CVS-FX1 Chapter 2 Basic operation

6. The menu [VRM Image] is displayed. Move the cursor with [▲] or [▼] keys of , and

select [Active Screen] and [All Screens].

7. Press [MENU] key , and the menu disappears and the selected VRM image is set.

Operation of VRM:

To move VRM downward:

If [▼] of is pressed, the line of VRM is highlighted with black edge and its value is

displayed in double sized characters.
Keep pressing [▼], and VRM moves downward. The display of value is updated at the depth.

When the second VRM is displayed, the second VRM also moves simultaneously downward.

When it comes near the aimed position, release the key. And by pressing a few times, fine
adjustment of the position can be done.

To move VRM upward:

If [▲】of is pressed, the line of VRM is highlighted with black edge and its value is

displayed in double sized characters.
Keep pressing [▲],and VRM moves upward. The display of value is updated at the depth.

When the second VRM is displayed, the second VRM also moves simultaneously upward.

When it comes near the aimed position, release the key. And by pressing a few times, fine
adjustment of the position can be done.

To move VRM Image to Active Screen:

To select the left screen, press [GAIN-L/SEL] and to select the right screen, press

[GAIN-R/SEL] , and display (red) blinking at the bottom of the screen to be

operated.

Caution: [Gain knob icon] at the bottom of screen changes to (red) when gain

setting is [Individual] and to (red) when [Synchronized].

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Chapter 2 Basic operation CVS-FX1

2.4.3 Operation of VRM on all Screens

To switch over VRM Image to All Screens:

1. Press [MENU] key .

2. The menu is displayed. Move the cursor to [Disp. Setup2] with [▲] or [▼] keys of .

3. Press [

►] key of .

4. The menu [Disp. Setup2] is displayed. Move the cursor to [VRM Image] with [▲] or [▼]

keys of .

5. Press [

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] key of .

CVS-FX1 Chapter 2 Basic operation

6. The menu [VRM Image] is displayed. Select [Active Screen] [All Screens] by moving the

cursor with [▲] or [▼] keys of .

7. Press [MENU] key , and the menu disappears and the selected VRM Image is set.

Operation of VRM:

To move VRM of [All Screens] downward:

Press [▼] of , and the line of VRM is highlighted with black edge and VRM value is

indicated in double sized characters.
Keep pressing [▼] key, and VRM moves downward. The display of value is updated at the
depth.
When the second VRM is displayed, the second VRM also moves simultaneously downward.
When it comes near the aimed position, release the key. And by pressing a few times, fine
adjustment of the position can be done.

To move VRM of [All Screens] upward:

Press [▲] of , and the line of VRM is highlighted with black edge and VRM value is

indicated in double sized characters.
Keep pressing [▲] key, VRM moves upward. The display of value is updated at the depth.
When the second VRM is displayed, the second VRM also moves simultaneously upward.
When it comes near the aimed position, release the key. And by pressing a few times, fine
adjustment of the position can be done.

Caution: At [All Screens Same (range)] and [All Screens Same (shift)], VRM on all

screens moves simultaneously. At [Scr. Individual (range)] and [Scr. Individual (shift)],
VRM individually moves per Active Screen.

To move VRM Image to an active screen at [Screen individual range]/[Screen individual shift],

to select the left screen, press [GAIN-L/SEL] and to select the right screen, press

[GAIN-R/SEL] , to display (red) blinking at the bottom of the screen to be

operated.

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Caution: [Gain knob icon] at the bottom of screen changes to (red) when gain

setting is [Individual] and to (red) when [Synchronized].

Chapter 2 Basic operation CVS-FX1

2.5 Reduction of noise on images

Images of echo sounders display noise due to various causes.

The causes of noise are:

1. Interference caused by reception of signals transmitted by other echo sounders

2. Blur due to micro animate beings such as plankton

3. Noise caused by electric signal synchronized with transceiver

CVS-FX1 is equipped with functions to weaken the effect by each cause.

2.5.1 To reject interference

Interference is generated by the reception of signals transmitted by other echo sounders.

CVS-FX1 can eliminate interference by the following two methods:

1. To shift your own frequency from the frequency used by other echo sounders, to avoid
reception of interference wave.

2. To reject interference by setting [IR (Interference Rejection) ] function.

<Example of IR (Interference Rejection) images>

Image with interference Image after rejection of interference

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