Navtex SNX - 300 User manual

NAVTEX RECEIVER
FOR GMDSS
INSTRUCTION MANUAL
SNX - 300
SAMYUNGENC CO.,LTD.

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CHAPTER 1. OVERVIEW...................................................................................................3
1.1. Genaral................................................................................................................................ 3
1.2. Broadcasting ....................................................................................................................... 3
1.2.1. Frequencies in Use....................................................................................................3
1.2.2. Location of Coast Stations and Broadcasting Time................................................... 3
1.2.3. Transmission Mode.................................................................................................... 4
1.3. Message Type..................................................................................................................... 4
1.3.1. Transmitted Message Type ....................................................................................... 5
1.3.2. Numbering ................................................................................................................. 5
1.3.3. End............................................................................................................................. 5
CHAPTER 2. GENERALS OF SYSTEM.............................................................................6
2.1. Features.............................................................................................................................. 6
2.2. System Composition ........................................................................................................... 6
2.3. Requirement on Receiving and Display .............................................................................. 7
2.4. Printer Port .......................................................................................................................... 7
2.5. External Port........................................................................................................................ 7
CHAPTER 3. SPECIFICATIONS ........................................................................................8
3.1. Receiver .............................................................................................................................. 8
3.2. DISPLAY SECTION ............................................................................................................ 8
3.3. POWER SUPPLY................................................................................................................ 8
3.4. ACTIVE ANT(SAN-300) ......................................................................................................8
3.7. Environment ........................................................................................................................ 8
CHAPTER 4. LED & BUTTON............................................................................................9
4.1. Front Panel.......................................................................................................................... 9
4.2. LED & Buzzer...................................................................................................................... 9
4.3. Button Explanation ............................................................................................................ 10
Chapter 5 How to operate ...............................................................................................11
5.0. System Menu Tree............................................................................................................ 11
5.1. Station Selection ............................................................................................................... 12
5.2. Message Selection............................................................................................................ 13
5.3. MESSAGE HISTORY........................................................................................................ 15
5.4 USER SETTING................................................................................................................. 17
5.5 SYSTEM HW SETTING..................................................................................................... 18
5.6 SYSTEM DIAGNOSTICS................................................................................................... 19
5.7 FACT MANUAL.................................................................................................................. 20
CHAPTER 6. INSTALLATION & TROUBLESHOOTING .................................................21
6.1. How to Install Receiver...................................................................................................... 21
6.1.1. Installation Place...................................................................................................... 21
6.1.2. Installation Sequence and Method........................................................................... 21
6.2. Antenna Installation........................................................................................................... 21
6.2.1. Installation Place...................................................................................................... 21
6.2.2. Installation Sequence and Method........................................................................... 21
CHAPTER 7. NEIGHBORING NAVTEX BROADCASTING TIMES .................................22
CHAPTER 8. Supported interface sentences ................................................................25

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8.1. IEC61097-6 ....................................................................................................................... 25
8.2. INS Signal. ........................................................................................................................ 28
CHAPTER 9. PACKING LISTS.........................................................................................29
CHAPTER 10. BLOCK DIAGRAM....................................................................................30
CHAPTER 11. EXTERNAL DRAWING.............................................................................31

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CHAPTER 1. OVERVIEW
1.1. Genaral
NAVTEX is an abbreviation for Navigational Telex and it is a Telex-broadcasting system of the coast
stations worldwide. NAVTEX of the coast stations broadcasts not only the defined ID, but also all the
information on navigational warnings, weather warnings, SAR and other marine warnings for
navigational safety of those vessels equipped with NAVTEX Receiver in the coasts.
Consisting of a part of WWNW of GMDSS monitored by IMO and IHO, NAVTEX with ‘Narrow Band
Direct Printing’ is a receiving system on board, using NAVTEX Receiver.
NAVTEX is designed to receive all the marine safety information service made with the letter
broadcasting both in English and in Local language on International Frequency: 518KHz and on Local
Frequency: 490KHz or 4209.5KHz. The services provided are mainly divided into 3(three) categories
as follows ;
Navigational warnings such as iceberg movement-related safety.
Meteorological warnings such as typhoons and wave heights.
Search and Rescue activities by Coast Guard or Coast Station, including any urgent warnings.
1.2. Broadcasting
1.2.1. Frequencies in Use
IMO recommends that navigational warning, meteorological warnings, information on SAR and other
information be received from NAVTEX Stations and broadcast on 518KHz for English, on 490KHz or
4209.5KHz. Both 518KHz for English and 490KHz for Korean have been used since March of 1999,
but Japan uses 424KHz for their local language exceptionally.
1.2.2. Location of Coast Stations and Broadcasting Time
The location of broadcasting stations basically depends on the transmitting output and the conditions
of the electric wave in the region. The stations are normally located in the range from some 250NM to
400 NM.
In reality, the major factors that decide the service region of the broadcasting stations are
‘Broadcasting Station ID’ and ‘Broadcasting Time Plan’.
It is decided by IMO Coordination Committee. As the broadcasting time of each station is every 4
hours, set not to exceed 10 minutes, the broadcasting between the stations is not overlapped.
Chapter 7 is covering the broadcasting time of each station in neighboring countries.

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1.2.3. Transmission Mode
According to M.625-3 of ITU-R Recommendations, as NAVTEX broadcasting employs 5 Bit Code as
ITA No.2 Code System (that is used for international telegraphic transactions by CCITT
Recommendations F.1), only 32 characters are available.
As it is impossible to display Text, Figures, Marks, Shift Signals only with 32 codes, the system
allocates the conversion signals and the figure conversion to Shift Signals and additionally allocates
26 codes.
The 32nd code is used to for the Korean shift code. 5Bit ITA code is converted to 7Bit and then
transmitted. All 7Bit codes are composed of 3(three) “ 1(B) ” and 4(four) “0(Y)” and used for
checking any errors.
Besides, the system works on correcting any errors in the way of FEC(Forward Error Correction) that
the same characters are transmitted at the back of 4 characters(280mS) for comparison.
M E S S A G E DX Signal
M E S S A G E DX Signal
M E S M S E A S GS E A G E TX Character
M E S S A G E TX Character
*Notes: Such cases may occur that the conversion code(Letter, Figure, Korean) is not received and
that the printing is faulty despite normal receipt of data.
1.3. Message Type
The message type of NAVTEX broadcasting is as follows. In transmitting, the system transmits
Message for matching with the receiver after transmitting Phase signal over 10 seconds. The general
message type is as below.
SNX-300 [518] [ 490] 10: 06. 02
ZCZC B1B2B3B4
Time of Origin( )
Series ID + Consecutive No. (
………………………………….
Message Text( )
…………………………………..
NNNN
PRT
NEXT
EXIT
In 0
Is 0
Ln 0
Ls 0
FEED

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1.3.1. Transmitted Message Type
ZCZC B1B2B3B4 Message NNNN.
①ZCZC : Start Code
②B1 : Station ID
③B2 : Type of Message
④B3B4 : Serial No.
⑤Message : Message
⑥NNNN : End of Message
Type of Message Description
A Navigational Warning
B Meteorological Warning
C Ice Report
D Search And Rescue Information/Piracy and Armed Robbery
E Meteorological Forecast
F Pilot Message
G AIS Message
H LORAN -C Message
I Reserved presently not used
J SANTNAV Message)
K Other Electronic Navigational Aid System Message
L Navigational Warning (additional)
M to Y Reserved presently not used
Z QRU (no message on hand)
* Notes: For the Boldface-related messages, it is forbidden to exclude Display on the receiver or
Printouts.
1.3.2. Numbering
Serial No. (B3B4) - Serial numbers from 01 to 99 are given in NAVTEX Message.
NAVTEX Coordinating Station gives these serial numbers. As a special figure, “00” is used only for
significant texts such as rescue and it is unconditionally displayed on LCD screen. In case NAVTEX
receives any message with this kind of special figure, it is designed to always print out whatever
message it is. Therefore, the printing is strictly controlled. Other serial numbers, excluding “00” are
memorized in CPU and used to avoid printing repetitively any completely received text.
1.3.3. End
NNNN : This means the end of any received text.(End of Message)

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CHAPTER 2. GENERALS OF SYSTEM
2.1. Features
The equipment is fully compliant with ITU-R M.540-2, M.476-3, M.625-3, IEC Standard IEC-
61162, IEC-60945 Performance Standard of IMO Resolution MSC.148 (77) Recommendations.
The equipment has 2(two) built-in receiving devices both on English channel (518KHz) and on
Local channel (490KHz/4209.5KHz).
Compact and light design creates the easy installation available.
The operation of power supply prevention circuit makes the input power cut in case of less than
DC 10V or more than DC 36V.
It can indicate the frequency on which any text is being received.
In case of failure in normally receiving, it shows the reason on LCD screen.
In case of power on and performance of its self-diagnosis test, it is possible to automatically
check the status of the equipment inside.
In case of receiving A, B, D, L type messages among the received messages, it is indicated on
LCD screen and a buzzer is activated.
It is available to select Station and message ID received.
It is possible to store more than 200 pieces of data, which is composed of 500 letters long on an
average.
For any received message, it can store for 72 hours.
It is available to select any Station ID for reception refusal and to select any received message
classification ID.
It does not store any message that has more than 33% error rate of received letters, or that fails
to display in a normal way.
2.2. System Composition
Model Q’ty Remark
NAVTEX Receiver SNX-300 1 EA
ANTENNA (Active) SAN-300/SAN-518 1 EA
ANTENNA CABLE RG-58C/U 15M
PRINTER DPU-414 1 Optional
CABLE ASS’Y 1 EA
Installation Material
Instruction Manual
Spare Fuse
AC/DC POWER SUPPLY SP-300AD 1 EA Optional

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2.3. Requirement on Receiving and Display
It prints out receiving message less than 4% error rate and ID (B1B2B3B4) are stored in the
memory to prevent out duplicate message in next receiving.
If the error rate of receiving message is at 33% (For over 5 sec.), stop receiving and do not save
the message on memory.
(If it does not receive "ZCZC B1B2B3B4" normally, stop receiving and saving a message.) When it
does not receive “NNNN" normally, no saving on memory even though it displays.
Available to save 100 head Ids and delete oldest message if it is over 200.
Automatically delete saved ID after around 72 hours.
Information of B1 and B2 are available to memorize for six hours after power off.
Serial number of messages prints out from “B3B4” to "00" whenever it receives.
It receives transmitting station of serial number “B1” and it can be confirmed the transmitting
station selected on the menu.
(It sets messages of all transmitting station (A~Z) in order to receive message when it delivers.)
It receives messages type of serial number “B2” and it confirms type at MENU. (It sets messages
of all transmitting station (A~Z) in order to receive message when it delivers.)
It contents A (navigational warning), B (meteorological warning), D (Research and Rescue), L
(additional warning at “L”), it doesn’t set to stop receiving. “D” always sounds alarm, it sets A, B,
L message.
(A, B, L message sets to stop alarm.)
If receiving letters have errors, it prints out “*” instead of the error letters.
2.4. Printer Port
Printer is supplied a printer interface port for the users to connect it selectively. The printer port is
a type of a serial interface.
2.5. External Port
The function of RS-422 interface is supplied to be possible connected with NAVIGATIONAL
equipments.

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CHAPTER 3. SPECIFICATIONS
3.1. Receiver
①Receiving Frequency : 518KHz , 490KHz or 4209.5KHz
②Receiving Modulation : F1B
③Sensitivity : 2uV e.m.f. (50 ohms), 4% error rate or less
④Antenna input : 50 ohms for NAVTEX antenna
3.2. DISPLAY SECTION
① Type of display : 5.7-inch STN Blue LCD, 320×240 dots
② Back-light : For LCD and key board
③ Dimmer control : Bright, medium1, medium2, off (Selectable from keyboard)
④
3.3. POWER SUPPLY
① Input voltage : 12 / 24Vdc (+30%, -10%):
② Power consumption : 10 W (at 24 Vdc input)
3.4. ACTIVE ANT(SAN-300)
① Receiving frequency : 518kHz, 490kHz and 4209.5kHz
② Consumption current : 9Vdc 10mA (Typ.)
③ Impedance : 50 ohms
3.7. Environment
① Receiver / Display unit : -15°C to +55°C
② Relative humidity : 95% at 40°C (without dew condensation)
③ Vibration : IEC 60945

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CHAPTER 4. LED & BUTTON
4.1. Front Panel
4.2. LED & Buzzer
A buzzer function of a display device is for users to operate it with convenient as it takes place
“Beep” sounds whenever each buttons were pressed.
Besides, it is designed for the users to recognize “alarm warning” easily as the function was
distributed to the buzzers when the Alarm Warning happens.
LED FUNCTION SECTION
ARM
(ALARM)
LED to show alarm function and it
appears when receiving characters
having correlation with alarms. RED LED
INT
(INTERNATIONAL)
It appears an international broadcast
receiving (English) and turns on and off
from phase-locked time to receive-
ended time.
YELLOW LED
LOC
(LOCAL)
It appears a Local language receiving
and turns on and off from phase-locked
time to receive-ended time. GREEN LED