SRT Marine Systems plc SRT-MTB-OEM Users Manual
SRT Marine Technology Ltd
Instruction Manual
LD2103 V3.4 Page 1 of 33
SRT-MTB Marine Automatic Identification System
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
Table of contents
LD2103 V3.4 Page 2 of 33
Table of contents ............................................................................................................................................................................2
General Warnings .....................................................................................................................................................................4
FCC Compliance .......................................................................................................................................................................4
RF Emissions Notice ................................................................................................................................................................5
Product Specification ..................................................................................................................................................................7
Standards ...................................................................................................................................................................................8
Declaration of Conformity ...........................................................................................................................................................8
Introduction.....................................................................................................................................................................................9
How AIS Works...........................................................................................................................................................................9
AIS Classes ..............................................................................................................................................................................10
Position Information Source......................................................................................................................................................10
Installing the SRT-MTB unit..........................................................................................................................................................11
Electrical connections ...............................................................................................................................................................11
Physical Mounting.....................................................................................................................................................................12
Programming the transponder ......................................................................................................................................................13
Programming the transponder ......................................................................................................................................................13
Programming software................................................................................................................ Error! Bookmark not defined.
Configuration .............................................................................................................................. Error! Bookmark not defined.
Using the transponder ..................................................................................................................................................................14
Switching on .................................................................................................................................................................................14
Switch functions............................................................................................................................................................................14
Warning and fault states ...............................................................................................................................................................14
Data port messages..................................................................................................................................................................15
Information Transmitted and Received .....................................................................................................................................15
Built In Test...............................................................................................................................................................................15
LED Indicators ..........................................................................................................................................................................16
Maintenance .............................................................................................................................................................................17
Serial Data Interface .....................................................................................................................................................................18
Power Connection / Data Connection.......................................................................................................................................18
Serial Port Input/Output ............................................................................................................................................................18
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
LD2103 V3.4 Page 3 of 33
Power up messages .................................................................................................................................................................19
VHF data link messages (NMEA 0183 VDM) ...........................................................................................................................19
VHF data link own vessel messages (NMEA 0183 VDO).........................................................................................................20
Regional Assignment Channel Assignment Message (NMEA 0183 ACA)................................................................................21
Channel management information source messages (NMEA 0183 ACS)................................................................................21
AIS Alarm Messages (NMEA 0183 ALR, Text).........................................................................................................................22
ACK messages .........................................................................................................................................................................22
Antenna connections ....................................................................................................................................................................23
GPS Antenna............................................................................................................................................................................23
VHF Antenna ............................................................................................................................................................................23
Antenna types and mounting ....................................................................................................................................................23
Drawings.......................................................................................................................................................................................24
Packing list................................................................................................................................................................................24
Glossary....................................................................................................................................................................................29
Appendix A ...................................................................................................................................................................................31
Antennas and Antenna Mounting..................................................................................................................................................31
GPS Antenna............................................................................................................................................................................31
VHF antenna for AIS use..........................................................................................................................................................31
Warnings...................................................................................................................................................................................32
LD2103 V3.4 Page 4 of 33
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
General Warnings
All marine Automatic Identification System (AIS) units utilise a satellite based system such as the Global Positioning Satellite
(GPS) network or the Global Navigation Satellite System (GLONASS) network to determine position.
The accuracy of these networks is variable and is affected by factors such as the antenna positioning, how many satellites are
used to determine a position and how long satellite information has been received for.
It is desirable wherever possible therefore to verify both your vessels AIS derived position data and other vessels AIS derived
position data with visual or radar based observations.
The compass safe distance of this unit is 0.5m or greater for 0.3° deviation.
In accordance with a policy of continual development and product improvement the SRT-MTB hardware and software may be
upgraded from time to time and future versions of the SRT-MTB may therefore not correspond exactly with this manual.
When necessary upgrades to the product will be accompanied by updates or addenda to this manual.
Please take time to read this manual carefully and to understand its contents fully so that you can install and operate your AIS
system correctly.
Information contained in this manual is liable to change without notice.
Software Radio Technology plc disclaims any liability for consequences arising from omissions or inaccuracies in this manual
and any other documentation provided with this product.
© 2007 Software Radio Technology plc.
FCC Compliance
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 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.
•
The SRT-MTB-OEM does not contain any user serviceable parts. Repairs should only be made by an authorized SRT service
agent. Unauthorised repairs or modifications could result in permanent damage to the equipment and void your warranty and
you’re authority to operate this equipment under Part 15 regulations.
LD2103 V3.4 Page 5 of 33
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
RF Emissions Notice
Caution: The SRT-MTB Class B AIS transponder generates and radiates radio frequency electromagnetic energy. This
equipment must be installed and operated according to the instructions contained in this handbook. Failure to do so
can result in personal injury and / or product malfunction.
Caution: Never operate the transponder unless it is connected to a VHF antenna.
To maximise performance and minimise human exposure to radio frequency electromagnetic energy you must make sure that
the antenna is mounted at least 1.5 meters away from the transponder and is connected to the transponder before power is
applied.
The system has a Maximum Permissible Exposure (MPE) radius of 1.5m. This has been determined assuming the maximum
power of the transponder and using antennas with a maximum gain of 3dBi.
The antenna should be mounted 3.5m above the deck in order to meet RF exposure requirements.
•
Higher gain antennas will require a greater MPE radius.
•
Do not operate the unit when anyone is within the MPE radius of the antenna (unless they are shielded from the
•
antenna field by a grounded metallic barrier).
The antenna should not be collocated of operated in conjunction with any other transmitting antenna.
•
This device has been designed to operate with standard marine VHF antennas having a maximum gain of 3dBi. Antennas not
included in this list or having a gain greater than 3dBi are strictly prohibited for use with this device. The required antenna
impedance is 50 ohms
Licensing and Maritime Mobile Service Identity (MMSI)
.
IMPORTANT: In most countries the operation of an AIS unit is included under the vessel's marine VHF licence provisions. The
vessel on to which the AIS unit is to installed must therefore possess a current VHF radiotelephone licence which lists the AIS
system and the vessel Call Sign and MMSI number.
An MMSI number is required in order for the SRT-MTB transponder to operate.
Please contact the relevant authority in your country for more information.
LD2103 V3.4 Page 6 of 33
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
Static Data Entry
WARNING: It is a violation of the rules of the Federal Communications Comission to input an MMSI that has not been
properly assigned to the end user, or to otherwise input any inaccurate data into this device.
The MMSI and Static Data in this transponder must be configured by the vendor of the device or by an appropriately qualified
person in the business of installing marine communications equipment on board vessels. In no event shall the entry of static
data into this Class B AIS device be performed by the end user. Knowingly programming a Class B AIS device with inaccurate
static data, or causing a Class B AIS device to be programmed with inaccurate static data, is prohibited.
Further details on static data programming can be found on page 13.
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
Product Specification
Parameter Value
Dimensions 190 x 135 x 83 mm (L x W x H)
Weight 1450g
Power DC (10.8 - 15.6V)
Average power consumption 4W
Peak current rating 2A
GPS Receiver (AIS Internal) IEC 61108-1 compliant
Electrical Interfaces RS232 38.4kBaud bi-directional
RS422 NMEA 38.4kBaud bi-directional
Connectors VHF antenna connector
GPS antenna connector
RS232/RS422/Power
VHF Transceiver Transmitter x 1
Receiver x 2 (One receiver time shared between AIS and DSC)
Frequency: 156.025 to 162.025 MHz in 25 kHz steps
Output Power 33dBm ± 1.5 dB
Channel Bandwidth 25kHz
Channel Step 25kHz
Modulation Modes 25kHz GMSK (AIS, TX and RX)
25kHz AFSK (DSC, RX only)
Bit rate 9600 b/s ± 50 ppm (GMSK)
1200 b/s ± 30 ppm (FSK)
RX Sensitivity Sensitivity - 107dBm 25kHz (Message Error Rate 20%)
Co-channel 10dB
Adjacent channel 70dB
IMD 65dB
Blocking 84dB
Environmental IEC 60945
Operating temperature: -25ºC to +55ºC
IEC 60945 'Protected' category
Indicators Power, TX timeout, status, pre-set SRM sent.
Operator Controls Optional pre-set safety related message (SRM) transmit button
LD2103 V3.4 Page 7 of 33
LD2103 V3.4 Page 8 of 33
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
Standards
This product complies to all the necessary standards under the European R&TTE directive for Article 3.1(a), 3.1(b), 3.2 and
3.3(e). The following standards have been followed in pursuance of this:
IEC62287-1: 2006-03 Maritime navigation and radiocommunication equipment and systems – Class B shipborne
•
equipment of the automatic identification system (AIS) – Part 1: Carrier-sense time division multiple access (CSTDMA)
techniques
IEC60945: 2002-08 Maritime navigation and radiocommunication equipment and systems – General requirements –
•
Methods of testing and required test results
IEC61162-1: Maritime navigation and radiocommunication equipment and systems – Digital interfaces – Part 1: Single
•
talker and multiple listeners
IEC61108-1: GLOBAL NAVIGATION SATELLITE SYSTEMS (GNSS) – Part 1: Global positioning system (GPS) -
•
Receiver equipment - Performance standards, methods of testing and required test results
EN 301 843-1 v2.1: Electromagnetic compatibility and Radio spectrum Matters (ERM); Electromagnetic Compatibility
•
(EMC) standard for marine radio equipment and services; Part 1: Common technical requirements
EN 50383: 2002 Basic standard for calculation and measurement of electromagnetic field strength and SAR related to
•
human exposure from radio base stations and fixed terminal stations for wireless telecommunications system (110MHz
– 40GHz)
EN60950-1:2002 Information technology equipment – Safety – Part 1: General requirements
•
Declaration of Conformity
Software Radio Technology plc declares that this product is in compliance with the essential requirements and other provisions
of the R&TTE directive 1995/5/EC.
The product carries the CE mark, notified body number and alert symbol as required by the R&TTE directive.
The product is intended for sale in the following member states:
LD2103 V3.4 Page 9 of 33
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
Introduction
How AIS Works
The marine Automatic Identification System (AIS) is a location and vessel information reporting system. It allows vessels
equipped with AIS to automatically and dynamically share and regularly update their position, speed, course and other
information such as vessel identity with similarly equipped craft. Position is derived from a Global Navigation Satellite System
(GNSS) network and communication between vessels is by Very High Frequency (VHF) digital transmissions. A sophisticated
and automatic method of time sharing the radio channel is used to ensure that even where a large number of vessels are in one
location blocking of individual transmissions is minimised, any degradation of the expected position reporting interval is
indicated to the user and even if the unit suffers extreme channel overload conditions it will always recover to normal operation.
LD2103 V3.4 Page 10 of 33
SRT Marine Technology Ltd
Instruction Manual
SRT-MTB Class B Marine AIS
AIS Classes
There are two classes of AIS unit fitted to vessels, Class A and Class B. In addition AIS base stations may be employed by the
Coastguard, port authorities and other authorised bodies. AIS units acting as aids to navigation (A to Ns) can also be fitted to
fixed and floating navigation markers such as channel markers and buoys.
Class A units are a mandatory fit under the safety of life at sea (SOLAS) convention to vessels above 300 gross tons or which
carry more than 11 passengers in International waters. Many other commercial vessels and some leisure craft also fit Class A
units.
Class B units are currently not a mandatory fit but authorities in several parts of the world are considering this. Class B units are
designed for fitting in vessels which do not fall into the mandatory Class A fit category.
The SRT - MTB is a Class B unit
Position Information Source
As noted above the marine AIS system uses position information derived from networks such as the Global Positioning Satellite
(GPS) or the Global Navigation Satellite System (GLONASS) in order to determine the location of the AIS unit and thus the
vessel to which it is fitted.
The SRT- MTB utilises the GPS satellite network.
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