Koden MDC-2000BB Series User manual

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MDC-2000BB Series Document Revision History
0093120012-01 i
MDC-2000BB Series Operation Manual
Doc No. 0093120012
Document Revision History
No. Doc. No / Rev. No. Revised Date
(Y/M/D)
Revised Content
0 0093120012-00 2020/01/10 First edition
1 0093120012-01 2020/02/28 Declaration
2
3
4
5
6
7
8
9
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.
© 2020 Koden Electronics Co., Ltd. All rights reserved.
No part of this publication may be reproduced, transmitted, translated in any from 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.
(Note) MDS-2060BB/2010BB including Antenna Scanner unit: RB717A/718A are not
complied for CE Approval.

Important Notices MDC-2000BB Series
ii 0093120012-01
Important Notices
 The re-use and transcription of Operation Manual (hereafter called this manual) needs permission
of our company. Our company prohibits the un-authorized re-use and transcription.
 If this manual is lost or damaged, consult our dealer or our company.
 The specification of our products and the content in this manual are subject to changed without
notice.
 In the explanation of this manual, the content displayed on the menu of product may be different,
depending on the situation. The keys and menus in the illustration may differ in physical font and
shape. And some parts may be omitted.
 Our company is not liable for damage and trouble arising from misunderstanding of the content
described in this manual.
 Our company is not liable for earthquake, lightning, fire for which our company is not responsible,
action by third party, other accident, customer’s unintended error/abuse and damage caused by
the use under other abnormal condition.
 Our company is not liable for damage of accompaniment (change/loss of memorized content, loss
of business profit, stop of business) arising from use or failure of our product.
 If the stored data is changed or lost, irrespective of any cause of trouble and damage, our
company is not liable for it.
 Our company is not liable for any damage arising from malfunction caused by combination of such
software and connected equipment that did not involve our company.

MDC-2000BB Series For Your Safe Operation
0093120012-01 iii
For Your Safe Operation
Symbol used in this Operation Manual
This manual uses the following symbols. Understand the meaning of each symbol and implement the
maintenance and inspection.
Symbol Meaning
Mark for warning
This symbol denotes that there is a risk of death or serious injury when not
dealing with it correctly.
Mark for danger high voltage
This symbol denotes that there is a risk of death or serious injury caused
by electric shock when not dealing with it correctly.
Mark for caution
This symbol denotes that there is a risk of slight injury or damage of device
when not dealing with it correctly.
Mark for prohibition
This symbol denotes prohibition of the specified conduct. Description of
the prohibition is displayed near the mark.
IMPORTANT Mark for important matters
This mark denotes that there is a possibility that data loss may interfere the
operation or that the expected result may not be obtained when the radar
is not dealt correctly.
Mark for reference
This mark shows the part to be referred to concerning this description.

For Your Safe Operation MDC-2000BB Series
iv 0093120012-01
Caution Item on Equipment
Caution on a high voltage inside.
A high voltage, which may risk your life, is used. This high voltage
remains in the circuit after you have powered off switch. To prevent
touching the high voltage circuit inadvertently, the protective cover is
provided to the high voltage circuit and the high voltage caution label is
affixed. Ensure to power off switch for your safety and discharge the
electricity remaining in the capacitor before starting to check. An
engineer authorized by our company should inspect and maintain the
circuit.
Ensure to switch off the power in the boat.
If the power switch is inadvertently powered on during work, you will be
electrified. To prevent such accident from occurring, ensure to switch off
the power in the boat and the power of equipment. Furthermore, it is
safer to hang the caution tag with description of [Under Work] near the
power switch of equipment.
Caution on dust
Inhaling dust may cause A respiratory disease. When cleaning the inside
of equipment, be careful not to inhale dust. Wearing a safety mask is
recommended.
Caution on location of equipment
Do not install the equipment where it is excessively damp and suffers
from excessive water drops.
Caution on static electricity
The static electricity may be generated from the carpet on the floor in the
cabin or clothes made of synthetic fiber. The static electricity may
destroy the electronic parts on the circuit board. Handle the circuit board,
taking the suitable anti-static measures.
Prohibited matter
Any Display and Scanner unit combination other than specified in the
manual is prohibited and will void manufacturer’s warranty.

MDC-2000BB Series For Your Safe Operation
0093120012-01 v
Caution Item on Handling
ENGLISH
Caution on the rotating aerial
The radar antenna may start to rotate without notice. Please
stand clear from the antenna for your safety.
Caution on electromagnetic disturbance
The operating Antenna & Scanner unit radiates high-energy
electromagnetic wave. It may cause harmful effect for human body due to
its continuous irradiation. As International regulation says, electromagnetic
waves less than 100 watt/m2 does not have a harmful effect on human
bodies, but some kind of medical devices such as heart pacemakers are
sensitive even under the low energy electromagnetic wave. Any personnel
with such a device should keep away from the electromagnetic wave
generating position at all times.
Specified power density and distance from the radar (in accordance with
the provision as specified in IEC 60945)
Model Xmit power/Antenna length 100W/m2 10W/m2
MDC-2003BB 4kW / 1.2 feet (Radome antenna) 0.6m 1.95m
MDC-2005BB 4kW / 2 feet (Radome antenna) 0.8m 2.54m
MDC-2004BB 4kW / 3 feet (Open antenna) 0.9m 2.85m
4kW / 4 feet (Open antenna) 1.01m 3.2m
MDC-2006BB
MDC-2060BB
6kW / 4feet (Open antenna) 1.09m 3.46m
6kW / 6 feet (Open antenna) 1.30m 4.10m
MDC-2012BB
MDC-2010BB
12kW / 4feet (Open antenna) 1.55m 4.89m
12kW / 6 feet (Open antenna) 1.84m 5.81m

For Your Safe Operation MDC-2000BB Series
vi 0093120012-01
FRENCH
Mise en garde relative aux perturbations électromagnétiques produites
par les radars de navire
L'antenne & l’émetteur des radars de navire ont un rayonnement d’ondes
électromagnétique de haute intensité. Ceci peut causer des effets nocifs pour le
corps humain en raison de son rayonnement continu. Comme la réglementation
internationale le spécifie, les ondes électromagnétiques à moins de 100 watt/m2
n'ont pas un effet néfaste sur le corps humain, mais certains types d’appareils
médicaux tels que les stimulateurs cardiaques peuvent être affectes même par des
ondes électromagnétiques de faible énergie. Tout membre du personnel avec un tel
dispositif devrait se tenir à l'écart des générateurs d'ondes électromagnétiques en
tout temps.
Spécification de densité de la puissance et de la distance du radar (conformément à
la disposition comme spécifié dans la IEC 60945)
Nom Modèle Puissance de transmission /
longueur d’antenne
100W/m2 10W/m2
MDC-2003BB 4kW / Antenne 1.2 pieds 0.6m 1.95m
MDC-2005BB 4kW / Antenne 2 pieds 0.8m 2.54m
MDC-2004BB 4kW / Antenne 3 pieds 0.9m 2.85m
4kW / Antenne 4 pieds 1.01m 3.2m
MDC-2006BB
MDC-2060BB
6kW / Antenne 4 pieds 1.09m 3.46m
6kW / Antenne 6 pieds 1.30m 4.10m
MDC-2012BB
MDC-2010BB
12kW / Antenne 4 pieds 1.55m 4.89m
12kW / Antenne 6 pieds 1.84m 5.81m

MDC-2000BB Series For Your Safe Operation
0093120012-01 vii
Warning Statements related to FCC and IC rules
 IC RSS-GEN, Sec 8.3 Warning Statement- (Required for Transmitters
w/ detachable antennas)
ENGLISH:
This radio transmitter (identify the device by certification number, or model number if
Category II) has been approved by Industry Canada to operate with the antenna types
listed below with the maximum permissible gain and required antenna impedance for
each antenna type indicated. Antenna types not included in this list, having a gain greater
than the maximum gain indicated for that type, are strictly prohibited for use with this
device.
FRENCH:
Le présent émetteur radio (identifier le dispositif par son numéro de certification ou son
numéro de modèle s'il fait partie du matériel de catégorie I) a été approuvé par Industrie
Canada pour fonctionner avec les types d'antenne énumérés ci-dessous et ayant un gain
admissible maximal et l'impédance requise pour chaque type d'antenne. Les types
d'antenne non inclus dans cette liste, ou dont le gain est supérieur au gain maximal
indiqué, sont strictement interdits pour l'exploitation de l'émetteur.
Antenna type name Antenna Gain (dBi) Required Impedance (ohm)
(440mm RADOME) 22.0dBi 50ohm
(640mm RADOME) 24.0dBi 50ohm
RW701A-03 25.3dBi 50ohm
RW701A-04 27.0dBi 50ohm
RW701A-06 28.5dBi 50ohm

For Your Safe Operation MDC-2000BB Series
viii 0093120012-01
 IC RSS-102, Sec 2.6 Warning Statement Requirements
ENGLISH:
The applicant is responsible for providing proper instructions to the user of the radio
device, and any usage restrictions, including limits of exposure durations. The user
manual shall provide installation and operation instructions, as well as any special usage
conditions, to ensure compliance with SAR and/or RF field strength limits. For instance,
compliance distance shall be clearly stated in the user manual.
FRENCH:
Le demandeur est responsable de fournir des instructions appropriées et toute restriction
d'utilisation, y compris les limites des durées d'exposition, à l'utilisateur de l'appareil radio.
Le manuel de l'utilisateur doit fournir des instructions d'installation et d'utilisation, ainsi
que toutes les conditions d'utilisation spéciales, pour assurer la conformité aux limites
SAR et / ou RF. Par exemple, la distance de conformité doit être clairement indiquée
dans le manuel de l'utilisateur.
 IC RSS-GEN, Sec 8.4 Warning Statement- (Required for
license-exempt devices)
ENGLISH:
This device complies with Industry Canada license-exempt RSS standard(s). Operation
is subject to the following two conditions: (1) this device may not cause interference, and
(2) this device must accept any interference, including interference that may cause
undesired operation of the device.
FRENCH:
Le présent appareil est conforme aux CNR d'Industrie Canada applicables aux appareils
radio exempts de licence. L'exploitation est autorisée aux deux conditions suivantes : (1)
l'appareil ne doit pas produire de brouillage, et (2) l'utilisateur de l'appareil doit accepter
tout brouillage radioélectrique subi, même si le brouillage est susceptible d'en
compromettre le fonctionnement.

MDC-2000BB Series For Your Safe Operation
0093120012-01 ix
 Warning statement regarding RF exposure compliance
ENGLISH:
The user manual of devices intended for controlled use shall also include information
relating to the operating characteristics of the device; the operating instructions to ensure
compliance with SAR and/or RF field strength limits; information on the installation and
operation of accessories to ensure compliance with SAR and/or RF field strength limits;
and contact information where the user can obtain Canadian information on RF exposure
and compliance. Other related information may also be included.
FRENCH:
Le manuel de l'utilisateur des dispositifs destinés à une utilisation contrôlée doit
également comporter des informations relatives aux caractéristiques de fonctionnement
du dispositif; Le mode d'emploi pour assurer la conformité aux limites SAR et / ou RF; Des
informations sur l'installation et le fonctionnement des accessoires afin d'assurer la
conformité aux limites SAR et / ou RF; Et des coordonnées où l'utilisateur peut obtenir des
renseignements canadiens sur l'exposition aux radiofréquences et la conformité. D'autres
renseignements connexes peuvent également être inclus.
 FCC Part 15.19 Warning Statement
THIS DEVICE COMPLIES WITH PART 15 OF THE FCC RULES. OPERATION IS
SUBJECT TO THE FOLLOWING TWO CONDITIONS: (1) THIS DEVICE MAY NOT
CAUSE HARMFUL INTERFERENCE, AND (2) THIS DEVICE MUST ACCEPT ANY
INTERFERENCE RECEIVED, INCLUDING INTERFERENCE THAT MAY CAUSE
UNDESIRED OPERATION.
 FCC Part 15.21 Warning Statement
NOTE: THE GRANTEE IS NOT RESPONSIBLE FOR ANY CHANGES OR
MODIFICATIONS NOT EXPRESSLY APPROVED BY THE PARTY RESPONSIBLE FOR
COMPLIANCE. SUCH MODIFICATIONS COULD VOID THE USER’S AUTHORITY TO
OPERATE THE EQUIPMENT.
 FCC Part 15.105(b) Warning Statement
NOTE: This equipment has been tested and found to comply with the limits for a Class B
digital device, pursuant to part 15 of the FCC Rules. These limits are designed to
provide reasonable protection against harmful interference in a residential
installation. This equipment generates uses and can radiate radio frequency energy and,
if not installed and used in accordance with the instructions, may cause harmful
interference to radio communications. However, there is no guarantee that interference

For Your Safe Operation MDC-2000BB Series
x 0093120012-01
will not occur in a particular installation. If this equipment does cause harmful
interference to radio or television reception, which can be determined by turning the
equipment off and on, the user is encouraged to try to correct the interference by one or
more of the following measures:
- Reorient or relocate the receiving antenna.
- Increase the separation between the equipment and receiver.
-Connect the equipment into an outlet on a circuit different from that to which the receiver
is connected.
-Consult the dealer or an experienced radio/TV technician for help.

MDC-2000BB Series For Your Safe Operation
0093120012-01 xi
Caution on Display unit
Do not push or scrub the surface of the Display unit with a pointed tip of a
hard matter (tool, tip of a pen, etc) Scars could be made.
Do not press the surface of the Display unit. Interference stripes or display
abnormality could occur.
Disposal of this radar
This radar shall be disposed according to the municipal regulations or rules.
Do not disassemble or modify. It may lead to trouble, fire, smoking or
electric shock. In case of trouble, contact our dealer or our company.
In case of smoke or fire, switch off the power in the boat and the power of
equipment. It may cause fire, electric shock or damage.
Caution on the remaining high voltage.
A high voltage may remain in the capacitor for several minutes after you
have powered off. Before inspecting inside, wait at least 5 minutes after
powering off or discharging the remaining electricity in an appropriate
manner. Then, start the work.
The information displayed in this unit is not provided directly for your
navigation. For your navigation, be sure to see the specified material.
Use the specified fuse. If un-specified fuse is used, it may cause a fire,
smoke or damage.

Break in procedure of stored radar MDC-2000BB Series
xii 0093120012-01
Break in procedure of stored radar
Following procedure is recommended for “Break In” of the stored
radar.
Otherwise the radar sometimes exhibits unstable transmitting
operation such as arcing at its initial operation after long period of
storage and make the operation more difficult.
1. Extend preheat time as long as possible (preferably 20 to 30
minutes).
2. Set the pulse length to the shortest one and start the operation.
When the operation in the shortest pulse is stable then go to
operation in longer pulse and repeat the similar step until the
operation reaches to the final pulse condition.

MDC-2000BB Series Contents
0093120012-01 xiii
Contents
Document Revision History ....................... i
Important Notices ..................................... ii
For Your Safe Operation ......................... iii
Break in procedure of stored radar ........ xii
Contents ................................................ xiii
Introduction ........................................... xvi
System Configuration ........................... xvii
Configuration of Equipment................. xviii
Chapter 1 Basic Operation...................... 1-1
1.1 How to read the radar screen .... 1-3
1.2 How to use the keys................... 1-4
1.3 Power On/Off ............................. 1-6
Power On ................................... 1-6
Power Off ................................... 1-6
Language Selection at Initial
Start-up ...................................... 1-6
1.4 Brilliance Adjustment.................. 1-6
Brightness Adjustment of Display
................................................... 1-6
Brightness Adjustment of
Panel .......................................... 1-6
1.5 Transmission .............................. 1-6
Start of Transmission ................. 1-6
Stop of Transmission ................. 1-6
1.6 Switch-over of Range ................ 1-7
Change of Range ....................... 1-7
Change of Sub-screen Range ... 1-7
1.7 Gain Adjustment ......................... 1-7
Adjustment of Main-dcreen Gain 1-7
Adjustment of Sub-screen Gain . 1-7
1.8 STC Adjustment ......................... 1-8
STC Adjustment ......................... 1-8
1.9 FTC Adjustment ......................... 1-9
1.10 Setting of OFF CENTER .......... 1-10
1.11 Setting of Enhance
(Enlarged Target) ..................... 1-10
1.12 EBL .......................................... 1-10
1.13 VRM ......................................... 1-10
1.14 Use of Function keys ............... 1-11
How to use [F1] - [F6] keys ...... 1-11
1.15 Use of Cursor ........................... 1-11
1.16 Measuring the distance and
bearing between two points ..... 1-12
How to operation ...................... 1-12
1.17 Camera Display ....................... 1-12
How to connect the CCD
camera ..................................... 1-12
How to display the video of the
CCD camera ............................ 1-12
Chapter 2 How to use the menu ............. 2-1
2.1 How to operate the menu .......... 2-1
Display/Non-display of Menu ..... 2-1
Operation of Menu ..................... 2-1
2.2 Setting of Display Mode ............. 2-1
H UP (Head Up) ......................... 2-2
N UP (North Up) ......................... 2-2
C UP (Course Up) ...................... 2-2
WPT UP (Waypoint Up) ............. 2-3
Relative Motion (RM) and True
Motion (TM) ................................ 2-3
True Motion Reset ..................... 2-4
2.3 Display Select ............................ 2-4
PPI Display ................................ 2-4
PPI/PPI Display .......................... 2-4
Note on PPI/PPI Display ............ 2-5
PPI/NAV Display ........................ 2-5
Note on PPI/NAV Display ........... 2-5
2.4 Setting of Signal Process ........... 2-5
2.5 Setting of Pulse Width ................ 2-5
2.6 Trailing ....................................... 2-5
Relative Display (R) ................... 2-5
True Display (T) ......................... 2-6

Contents MDC-2000BB Series
xiv 0093120012-01
2.7 Display Color .............................. 2-6
2.8 Cursor Shape ............................. 2-7
2.9 PI (Parallel Index Line) ............... 2-7
2.10 Bearing Mode ............................. 2-7
2.11 Vector ......................................... 2-7
2.12 Alarm .......................................... 2-8
IN Mode ...................................... 2-8
OUT Mode .................................. 2-8
Setting of Alarm Range .............. 2-8
2.13 Sleep .......................................... 2-8
Operation during executing the
sleep ........................................... 2-8
2.14 AIS .............................................. 2-9
Setting of Symbol Display of
AIS .............................................. 2-9
Setting of Detailed Information of
Designated Symbol Display ....... 2-9
Types and Meanings of AIS
Symbols ...................................... 2-9
2.15 ATA ........................................... 2-10
Automatic Acquisition ............... 2-10
Manual Acquisition ................... 2-10
Target Level .............................. 2-11
Target Delete ............................ 2-11
Number of Acquisition .............. 2-11
Information Display .................. 2-11
ATA Performance ..................... 2-11
Types and Meanings of ATA
Symbols .................................... 2-12
Chapter 3 How to use the system
menu ..................................... 3-1
3.1 Display of System Menu ............ 3-1
Display the System menu .......... 3-1
Return to the normal menu ........ 3-1
3.2 Setting of Assist Items ................ 3-1
Range Rings .............................. 3-1
Range Unit ................................. 3-1
Speed Unit .................................. 3-1
Temperature Unit ........................ 3-1
Depth Unit .................................. 3-1
Position Display .......................... 3-1
WPT Display ............................... 3-2
Rotation Speed ........................... 3-2
ALL PPI ...................................... 3-2
Guide .......................................... 3-2
Buzzer ........................................ 3-2
Motor Speed ............................... 3-2
N UP/S UP ................................. 3-2
Cursor Display ............................ 3-2
Radar Setting Display ................ 3-2
Menu Operation ......................... 3-2
3.3 Setting of Adjustment Items ....... 3-2
Bearing Setting ........................... 3-3
TX Delay Adjustment .................. 3-3
MBS ............................................ 3-3
STC Curve ................................. 3-4
Tune Select ................................ 3-5
Automatic Tuning ....................... 3-5
Manual Tune Adjustment............ 3-5
Pulse Width ................................ 3-5
Interference Rejection ................ 3-6
Echo Color Divide ...................... 3-6
Signal Select .............................. 3-6
3.4 NMEA ......................................... 3-6
Connection with the KODEN GPS
compass ..................................... 3-7
3.5 Preset ......................................... 3-7
Nav Display select ...................... 3-7
Language Select ........................ 3-7
[F1]-[F6] Key Set ........................ 3-7
Select Range S/M/L ................... 3-7
Echo Color Set ........................... 3-7
Trail Color Set ............................ 3-7
Display Color Set ....................... 3-7
Camera Position Correction ....... 3-7
3.6 Maintenance ............................... 3-7
Processor Unit ............................ 3-7

MDC-2000BB Series Contents
0093120012-01 xv
Antenna ...................................... 3-7
Panel Test .................................. 3-7
LCD Test .................................... 3-8
Operation Hours Reset .............. 3-8
TX Hours Reset ......................... 3-8
ALL Reset .................................. 3-8
System Program Renewal ......... 3-8
Chapter 4 Maintenance ........................... 4-1
4.1 Maintenance .............................. 4-1
4.1.1 Monthly Inspection ..................... 4-1
4.1.2 Yearly Inspection ........................ 4-2
4.2 Fuse Replacement ..................... 4-3
4.3 Consumables ............................. 4-3
4.4 Trouble Diagnosis ...................... 4-3
4.4.1 Information required for
requesting a repair ..................... 4-3
4.4.2 Error Display .............................. 4-3
4.4.3 Self-diagnostic Function ............ 4-4
4.4.4 Inspection at Each Location ....... 4-5
Chapter 5 Equipment .............................. 5-1
5.1 Antenna Installation ................... 5-1
Determining the location of
the installation ............................ 5-1
How to shift the antenna from an
obstacle ...................................... 5-2
Installation of Antenna ................ 5-3
Installation of Radome Antenna . 5-3
Setting of Open Antenna ............ 5-4
Installation of Antenna ................ 5-5
Cable Connection ...................... 5-7
5.2 Mutual Connection Diagram .... 5-22
5.3 Processor Unit Installation ....... 5-24
5.4 Operation Unit Installation........ 5-25
5.4.1 Desk-top Installation ................ 5-25
5.4.2 Flush-mount Installation ........... 5-26
5.5 Adjustment after Installation..... 5-28
5.6 Wiring ....................................... 5-29
Cable connection to the Processor
unit ........................................... 5-29
Pin Assignment of Rear
Connector ................................ 5-30
Connection of DC power
cable ........................................ 5-31
Grounding ................................ 5-31
Connection with the AIS
Receiver ................................... 5-31
Connection with the navigation
equipment ................................ 5-31
Connection of CCD Camera .... 5-32
5.7 List of Input/Output Sentence .. 5-32
Input Sentence ......................... 5-32
Output Sentence ...................... 5-33
Chapter 6 Attached Table ....................... 6-1
6.1 Menu Configuration.................... 6-1
6.2 Specifications ............................. 6-4
6.3 External View ............................. 6-6
Chapter 7 Principle of radar system ....... 7-1
7.1 What is the radar system? ......... 7-1
Side lobe .................................... 7-1
Beam width ................................ 7-1
7.2 Characteristics of radar radio
wave ........................................... 7-2
Target with less reflection .......... 7-2
Radar shadow ............................ 7-2
False image ............................... 7-2
7.3 Radar interference ..................... 7-4

Introduction MDC-2000BB Series
xvi 0093120012-01
Introduction
Thank for your purchase of KODEN marine radar MDC-2000BB Series.
The quality and endurance of a unit is well considered. For the best performance, read this Operation
Manual and operate a unit correctly and safely.
The main features of this unit are as follows.
 The high performance radar is Black Box type and can be used for professional use.
 In the true trail function, as moving targets such as other ships are displayed being tailed and
stationary targets such as land are displayed being fixed, the moving targets and fixed targets can
be easily discriminated.
 Two screen images of different ranges can be displayed. If you set a near distance screen and a far
distance, you can navigate properly and grasp a situation.
 The automatic tracking function (ATA) is provided. The maximum 50 targets can be tracked. The
current motion of other ships can be grasped in a vector and numeral so that it helps your ship to
navigate safely. (Optional)
 By connecting the AIS receiver, the gathered information such as name, heading and speed of a
ship can be displayed. (Optional interface)
 The processor unit can connect to any VGA type display. (VGA type display : Prepared by a
customer)
 A video from a CCD camera can be displayed. The inside of a ship can be observed by a camera
installed at the engine room helps your ship navigate safely. (CCD camera: Prepared by a customer)
(CCD camera cable: Optional)
 With the adoption of the GAIN/STC rotary knob, the operability is enhanced.