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WARNING
1.Do not open the equipment.
An only person who has the technology qualification can inspect
the equipment interior.
2.If smoke or fire happens in the equipment, intercept
input power supply immediately.
Continuous use of the equipment can do fire or electrical impact to
happen. In these case, must communicate in the service agency
which an Saracom Co.,Ltd. or Saracom Co.,Ltd. specifies.
3. Do far from the heating appliances.
The heating appliances can melt the power cord of equipment, and
can become cause of the fire or electrical impact.
4. Be not exposed from the snow and rain.
The snow and rain such as liquid matter can bring the breakdown
of equipment, and electrical danger.
5. Use the fuse of optimum capacity.
The fuse capacity is appeared in the equipment. The use of wrong
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fuse can bring damage in the equipment.
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.
CONTENTS
1. NAVTEX System ...............................................................................................1
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2. NAVTEX RECEIVER "NR-50”
1. NAVTEX System
1.1 Product introduction
NAVTEX is designed to provide international automated direct-printing service such as
promulgation of SAR (Search and Rescue) information, Navigational warnings, Meteorological
warnings and urgent information to ships. It has been developed to provide a low-cost, simple
and automated means of receiving maritime safety information for on board ships at sea and in
coastal waters. The information transmitted by NAVTEX coast station, is delivered to each ship
directly. On the bridge, the NAVTEX receiver accepts, selects information required for the ship
and displays in LCD automatically in English or Korean mode as following [Figure 1-1]
international English broadcasting and [Figure 1-2] Korean broadcasting. NAVTEX means the
system for broadcast and automatic reception of maritime safety information by means of
narrow-band direct-printing telegraphy and it is a component of IMO(International Maritime
Organization)/IHO(International Hydrographic Organization) WWNWS World Wide Navigational
Warning Service) defined by IMO Assembly resolution A.706(17). In the GMDSS(Global Maritime
Distress and Safety System), since the 1st August 1993, NAVTEX receiving capability has
become part of the mandatory equipment which is required to be carried in certain vessels under
the provisions of the International Convention for the Safety of Life at Sea(SOLAS), 1974, as
amended in 1988.
This system provides International and National service as follows.
1. International NAVTEX service means the coordinated broadcast and automatic reception
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on frequency 518kHz of maritime safety information (MSI) by means of narrow-band
direct-printing telegraphy using the English language.
2. National NAVTEX service means the broadcast and automatic reception of maritime safety
information by means of narrow-band direct-printing telegraphy using 490kHz or 4209.5kHz
frequencies other than 518kHz as decided languages by the Administrations concerned.
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Saracom Co., Ltd. 1 Q/A
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2. NAVTEX RECEIVER "NR-50”
“NR-50” NAVTEX receiver designed to receive together domestic NAVTEX service (490kHz
Korean broadcasting) and international NAVTEX service (4209.5kHz).
"NR-50" NAVTEX receiver also fully complies with the operational and technical
characteristics of ITU-R recommendation M.540-2 and performance standards for ship borne
narrow-band direct-printing equipment in IMO assembly resolution A.525(13)
---< Navigational Warnings>---
[ 518 ] 2006 / 09 / 01
[ 490 ] U 00 : 38 : 52
CCGDI BNM 1140-91
OMEGA STATUS AS OF 16 JUL 99-A POLAR CAPDISTURBANCE COMMENCED AT 051700Z JUN 99.
USE CAUTION WHEN USING POLAR PATH SIGN-ALS
AS REPORTS MAY EXIST ON ALL NAVIGA-TI ONAL
FREQUENCIES. 10.2 KHZ SIGNALS MAY BE IN ERROR
BY ONE HALF LANE OR MORE. OMEGA STATION D ,
NORTH DAKOTA, WILL BE OFF ? AIR FOR ANNUAL
MAINTENANCE FROM 081300Z JUL 99 TO 192100Z
JUL 99. OMEGA STATION B, LIBERIA, WILL CONTINUE
TO TRANS-MIT AT REDUCED *OWER UNTIL
FURTHER NOTICE . BT
MASSAGE VIEW
NNNN
518kHz ZA01 06/09/01 00 : 28 00%
[Figure 1-1] International NAVTEX English broadcasting
---<기상 예보>---
[ 518 ] 2006 / 09 / 01
[ 490 ] U 00 : 38 : 52
1999 년10 월20 일0530 한국표준시
KOREA NAVTEX / / /기상청제공 / / 일반 : 기상예보오늘 (20일) 은고기압가장자리에들겠으나중부지방은약한기압골의
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490kHz KE00 06/09/01 00 : 28 00%
영향을받아해상은대체로맑겠으나한때구름이많겠음 . 바다의물결
은전해상에에서 0.5-2M 로일겠고서해상에는짙은안개가끼겠음.
电话:28631117
내일(21일) 은고기압의영향을받겠으나중북부지방은북쪽을지나는
약한기압골의영향을점차받겠음. 전해상구름조금끼겠으나동해상
은흐리겠음.바다의물결은동해먼바다및남해동부먼바다에서 1.5-
2.5M 로일겠고그밖의해상은 0.5-2M 로일겠음.
NNNN
MASSAGE VIEW
Saracom Co., Ltd. 2 Q/A
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2. NAVTEX RECEIVER "NR-50”
[Figure 1-2] National NAVTEX Korean broadcasting
1472
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Saracom Co., Ltd. 3 Q/A
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[Figure 1-3] The NAVTEX concept
2. NAVTEX RECEIVER "NR-50”
1.2 Theoretical features of NAVTEX
NAVTEX service uses a single frequency for transmissions from nominated stations within
each NAVAREA being arranged on a time-sharing basis to eliminate mutual interference as
following [Figure 1-4].
All necessary information is contained in each transmission. The power of each transmitter is
regulated so as to avoid the possibility of interference between transmitters. It may be adjusted to
provide a range of about 250 to 400 nautical miles.
Normally a dedicated NAVTEX receiver which has the ability to select messages to be printed
according to a technical code(B1, B2, B3, B4), which appears in preamble of each message and
whether or not the particular message has already been printed.
But certain essential classes of safety information such as navigational and meteorological
warnings and search and rescue information are non-reject able to ensure that ships using
NAVTEX always receive the most vital information.
According to [Figure 1-3] of the NAVTEX concept, NAVTEX coordinators exercise control of
messages transmitted by each station according to the information contained in each message
and the geographical coverage required. Thus a user may choose to accept messages, as
appropriate, either from the single transmitter which serves the sea area around his position or
from a number of transmitters.
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电话:28631117
Saracom Co., Ltd. 4 Q/A
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2. NAVTEX RECEIVER "NR-50”
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电话:28631117
Saracom Co., Ltd. 5 Q/A
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2. NAVTEX RECEIVER "NR-50”
[Figure 1-4] NAVAREA of the WWNWS
[Figure 1-5] Coast Station Allocation in NAVAREA XI and XIII
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2. NAVTEX RECEIVER "NR-50”
1.3 NAVTEX message format
The format of all messages is set according to [Figure 1-6]. This defines essential elements of
the message that influence the receiver to be operated.
Great care is required to avoid errors of syntax in the groups ZCZC, B1B2B3B4, and NNNN as
they will cause receivers operate incorrectly, and may well result in the loss of vital message.
[ 518 ] 2006 / 09 / 01
[ 490 ] U 00 : 38 : 52
Message contents
MESSAGE VIEW
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NNNN
518kHz B1B2B3B4 06/09/01 00 : 38 00%
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2. NAVTEX RECEIVER "NR-50”
[Figure 1-6] Standard format for NAVTEX messages
In [Figure 1-6], B1(Transmitter identification character) is single unique letter which is allocated
to each transmitter. [Figure 1-4] and [Figure 1-5] is relevant to whole NAVAREA and the station
of NAVAREA XI. B2 (Subject indicator character) is in use as following [Table 1-1].
E Meteorological Forecasts
F Pilot service Messages
G DECCA Messages
H LORAN Messages
I OMEGA Messages
J SATNAV Messages
K Other Electronic Navaid Messages
L*
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M~Y Reserved
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Z QRY
Remark: The character marked with "*", can’t be rejected by the receiver.
Search and Rescue information
and pirate attack warnings
Navigational Warnings
-Additional letter “A”
[Table 1-1] The messages of subject indicator character
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2. NAVTEX RECEIVER "NR-50”
1.4 Message numbering
According to [Figure 1-6] of Standard format for NAVTEX messages, each message within a
subject group is allocated a serial number, B3B4, between 01 and 99. This number should be
allocated by the relevant NAVTEX coordinator.
Certain message is allocated [the B3B4 = 00]. Use of this number should be strictly controlled
since messages carrying it will always be displayed in LCD screen, if the broadcast containing
such messages is identified to accept by the receiver. Therefore, the number "00" must only be
used for severely important messages, such as an initial distress message. Routine messages
and service messages should not be allocated to the number “00”.
All message numbers including "00", are stored in the memory always.
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电话:28631117
Saracom Co., Ltd. 9 Q/A
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2. NAVTEX RECEIVER "NR-50”
1.5 NAVTEX transmitting station and transmission time
1) International NAVTEX service of adjoining countries (XI, XIII NAVAREA / English)
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2. NAVTEX RECEIVER "NR-50”
2. NAVTEX Receiver “NR-50”
2.1 Summary
The NAVTEX receiver "NR-50" designed to receive international NAVTEX service reception as
well as permanent place NAVTEX service at the same time, use of NAVTEX system of ITU-R
M.540-2 and technological characteristic and performance criteria of IMO A.525 (13) effective.
And "NR-50" NAVTEX receiver has a following characteristics in addition to basic characteristics.
• 518kHz and 490kHz / 4209.5kHz two channels at the same time ready for receiving
• Received message contents Appear on LCD screen
• Size of (10 x 16) 32 English characters display in LCD one line
• Size of (16 x 16) 20 Korean characters display in LCD one line
• 16 line indication possibility on one screen
• Received message printing possibility (Option)
• INS Interlock possibility
• NMEA Interlock possibility
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电话:28631117
Saracom Co., Ltd. 14 Q/A
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2. NAVTEX RECEIVER "NR-50”
2.2 Composition and elements
This system consisted of the “NR-50” mainframe, RF pre-amplifier and Antenna, Power supply
(Option), Printer(Option) etc., are same [Figure 2-1]. And components of the equipment is same
with [Table 2-1]. Also, interior composition of NAVTEX receiver main frame is same with
[Figure 2-2].
System Block Diagram
NR-50
NAVTEXRECEIVER
P.S.U
FREQMENU
ENT
ESCDIM
PWROFF
EXTERNAL PRINTER
DPU-414 PRINTER(OPTION)
NAVTEX ANTENNA
[Figure 2-1] Composition of NAVTEX receiver
NR-50 Dimension
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[Figure 2-2] Composition of NAVTEX receiver “NR-50”
Saracom Co., Ltd. 15 Q/A
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2. NAVTEX RECEIVER "NR-50”
Package contents
No.
1 " NR-50" main frame 1
2 Bracket 1 Mounting for main unit
3 Cracking Handle 2 Mounting for main unit