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CONTENTS

1 Scope ........................................................................................................................................ 2

2 Normative references .............................................................................................................2

3 Terms, definitions and abbreviations ....................................................................................3

3.1 Definitions ......................................................................................................................3 3.2 Abbreviations .................................................................................................................4

4 General and operational requirements .................................................................................4

4.1 General ........................................................................................................................... 4 4.2 Classes of Radio ...........................................................................................................4 4.3 Composition ...................................................................................................................5 4.4 Construction .................................................................................................................. 5 4.5 Operating Frequencies .................................................................................................5 4.6 Controls and indicators ................................................................................................5 4.7 DSC Calls ...................................................................................................................... 6

4.7.1 Call functions ....................................................................................................6 4.7.2 MANUAL calls ..................................................................................................7 4.7.3 Distress calls ....................................................................................................7 4.7.4 Distress Call Acknowledgement .....................................................................8 4.7.5 Incoming calls ..................................................................................................8

4.8 D isplay ........................................................................................................................... 8 4.9 Microphone and loudspeaker ......................................................................................8 4.10 Safety precautions ........................................................................................................9 4.11 Battery ............................................................................................................................ 9

4.11.1 Primary Batteries .............................................................................................9 4.11.2 Secondary Batteries ......................................................................................10

4.12 Labelling ...................................................................................................................... 10 4.13 Warm up ....................................................................................................................... 10 4.14 Internal Memory ..........................................................................................................10

5 Technical requirements ........................................................................................................11

5.1 Switching time .............................................................................................................11 5.2 Class of emission and modulation characteristics ..................................................11 5.3 Facilities for DSC transmission and reception ........................................................11

5.3.1 General ...........................................................................................................11 5.3.2 Decoding .........................................................................................................11 5.3.3 Clear channel transmission ..........................................................................11 5.3.4 Automatic acknowledgement ........................................................................11 5.3.5 Automatic re-transmission of distress calls ................................................12

5.4 Ships identity – MMSI and Group MMSI ..................................................................12 5.5 Position information ....................................................................................................12

5.5.1 Internal navigation device performance ......................................................12 5.5.2 Internal navigation device timing .................................................................13

5.6 Alarm circuits for incoming calls ...............................................................................13 5.6.1 Distress and urgency .....................................................................................13 5.6.2 Other categories ............................................................................................13

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5.6.3 Cancellation of alarms ..................................................................................13 5.6.4 Acoustic alarm power ....................................................................................13

5.7 Multiple watch facilities ..............................................................................................14 5.7.1 General ...........................................................................................................14 5.7.2 Scanning provisions DO WE WANT TO RETAIN OR DELETE THIS

SECTION? ......................................................................................................14 5.7.3 Scanning characteristics DO WE WANT TO RETAIN OR DELETE THIS

SECTION? ......................................................................................................14 5.8 Built-in test ................................................................................................................... 15

6 General conditions of measurement ...................................................................................15

6.1 Power Supply ..............................................................................................................15 6.2 Warm-up Period ..........................................................................................................15 6.3 Instructions .................................................................................................................. 15 6.4 Additional Facilities / Supplemental Devices ...........................................................15 6.5 Audible and Visual Indications ..................................................................................15 6.6 Preparation of VHF Radio for type-approval testing ...............................................15 6.7 Measurements and Observations .............................................................................16 6.8 Test Conditions ...........................................................................................................16

6.8.1 Normal test conditions ..................................................................................16 6.8.2 Extreme test conditions .................................................................................16

6.9 Equipment Class .........................................................................................................16 6.10 Performance Check ....................................................................................................16 6.11 Performance Test .......................................................................................................17 6.12 Pre-conditioning and Post Examination for Environmental Tests .........................17 6.13 SEQUENCE OF TESTS .............................................................................................17

6.13.1 Environmental Tests ......................................................................................17 6.13.2 Electrical Performance Tests .......................................................................17

7 Environmental tests ..............................................................................................................18

8 Transmitter ............................................................................................................................. 18

9 Radiotelephone receiver ......................................................................................................18

10 Receiver for DSC decoder ...................................................................................................18

11 Electromagnetic capability ...................................................................................................18

12 Documentation ...................................................................................................................... 18

Annex   A (normative) Types of DSC Calls ................................................................................20

A.1 DSC Calls .................................................................................................................... 20 Annex   B (informative) Intellectual Property .............................................................................21

B.1 Policy ............................................................................................................................ 21 B.2 Essential patented technologies ...............................................................................21 B.3 Non-essential patented technologies .......................................................................21

1 Scope ........................................................................................................................................ 2

2 Normative references .............................................................................................................2

3 Terms, definitions and abbreviations ....................................................................................2

3.1 Definitions ......................................................................................................................2 3.2 Abbreviations .................................................................................................................3

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4 General and operational requirements .................................................................................3

5 Technical requirements ..........................................................................................................3

6 General conditions of measurement .....................................................................................3

7 Environmental tests ................................................................................................................3

8 Transmitter ............................................................................................................................... 3

9 Radiotelephone receiver ........................................................................................................3

10 Receiver for DSC decoder .....................................................................................................3

11 Electromagnetic capability .....................................................................................................3

12 Documentation ........................................................................................................................3

Annex   A (normative) ...................................................................................................................... 5

Annex   B (informative) Intellectual Property ...............................................................................6

B.1 Policy .............................................................................................................................. 6 B.2 Essential patented technologies .................................................................................6 B.3 Non-essential patented technologies .........................................................................6

RTCM Paper 210-2008-SC101-228

RADIO TECHNICAL COMMISSION FOR MARITIME SERVICES

VHF-FM portable marine radiotelephone equipment with Digital Selective Calling (DSC) and Global Navigation Satellite System (GNSS) location

functions

INTRODUCTION

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RADIO TECHNICAL COMMISSION FOR MARITIME SERVICES

VHF-FM portable marine radiotelephone equipment with Digital Selective Calling (DSC) and Global Navigation Satellite System (GNSS) location

functions

1 Scope

This document specifies the minimum functional and technical requirements for VHF-FM portable marine radiotelephones, equipped with Digital Selective Calling (DSC), and Global Navigation Satellite System (GNSS) functions. These radios are intended to be used on small vessels which may not be equipped with a fixed radio installation. Their purpose is to provide basic distress and routine calling functions with a simple user interface to make them easy to use by persons who are not completely familiar with DSC radio operation.

Since the envisioned user of these radios may not have access to accurate position and navigation information, the radio is equipped with a GNSS processor which is intended to encode a distress call with location information.

Since users may not be familiar with DSC functionality, manufacturers that add additional functions not required under this standard, should strive to maintain a simple user-friendly interface.

VHF Radios that meet this standard are divided into three classes:

Class 1 A General Purpose radio designed for use on smaller vessels, but where it is unlikely that the radio will be dropped overboard, this radio will not float without additional buoyancy aids .

Class 2 A General Purpose radio designed for use on small vessels, where it is possible that the radio may be dropped overboard, this radio will float without any additional buoyancy aids.

Class 3 A radio intended to comply with IMO SOLAS requirements that could potentially be used in a Survival Craft in an emergency that may in due course becom e a part of the GMDSS.

2 Normative references

The following referenced documents are indispensable for the application of this document to the extent specified herein. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

IEC 60945 - Maritime navigation and radio communication equipment and systems general requirements - methods of testing and required test results (2002-08)

ITU Radio Regulations, Appendix S18: 1998, Table of transmitting frequencies in the band 156 - 174 MHz for stations in the maritime mobile service

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ITU-R M.493-11 - Digital selective-calling system for use in the maritime mobile service

ITU-R Recommendation M.821-1: 1997, Optional expansion of the digital selective-calling system for use in the maritime mobile service

ITU-R Recommendation M.1084-4: 2001, Interim solutions for improved efficiency in the use of the band 156 -174 MHz by stations in the maritime mobile service

ITU-T Recommendation E.161, Arrangement of digits, letters and symbols on telephones and other devices that can be used for gaining access to a telephone network

3 Terms, definitions and abbreviations

3.1 Definitions

IntegralThe term “integral” where used in this standard indicates that the feature or function is a permanent part of the equipment and cannot be removed or disconnected from it without the use of tools.

shall/shouldThe term “shall” is used to describe attributes which are considered mandatory by RTCM in order to meet the standard. The term "should” is reserved for recommended provisions. There is no intent to prevent a law, regulation, contract, or other document referencing this standard from amending the provisions herein for the purposes of that instrument.

NOTE: The documentation provided with equipment which is claimed to meet this standard but which has been exempted from any mandatory feature, should explain the deviation from this standard.

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3.2 Abbreviations

DSC Digital Selective Calling

EMC Electro Magnetic Compatibility

EUT Equipment Under Test

FM Frequency Modulation

GMDSS Global Maritime Distress and Safety System

GNSS Global Navigation Satellite System

IEC International Electrotechnical Commission

IMO International Maritime Organisation

ITU International Telecommunication Union

MHz Megahertz

PEP Peak Envelope Power

PERP Peak Effective Radiated Power

PLL Phase Locked Loop

RF Radio Frequency

RMS Root Mean Squared

RTCM Radio Technical Commission for Maritime Services

SOLAS Safety Of Life At Sea

TTFF The Time To First Fix

VHF Very High Frequency

4 General and operational requirements

4.1 General

The manufacturer shall declare that compliance to the requirements of clause 4 is achieved and shall provide relevant documentation if requested.

4.2 Classes of Radio

Three classes of radio are permitted as defined below:

Class 1 – General Purpose not required to float

Class 2 – General Purpose required to float

Class 3 – Full SOLAS Compliance

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4.3 Composition

The equipment shall, as a minimum include a handset which includes

– a VHF radiotelephone transmitter;

– a VHF radiotelephone receiver;

– a DSC encoder;

– a DSC decoder; and

– a integral GNSS Receiver.

4.4 Construction

The mechanical and electrical construction and finish of the equipment shall conform in all respects to good engineering practice, and the equipment shall be suitable for hand-held use on board vessels.

All controls shall be of sufficient size to enable the usual control functions to be easily performed and the number of controls should be the minimum necessary for simple and satisfactory operation.

Adequately detailed operating instructions shall be provided with the equipment.

Class 3 radios shall be predominantly highly visible yellow or orange in color. Class 1 and 2 radios maybe any color other than yellow or orange.

4.5 Operating Frequencies

The equipment shall be capable of operating on single frequency and two-frequency channels with manual control (simplex).

As a minimum, Class 1 and Class 2 radios shall be able to operate on all the international VHF channels [check definition] defined in appendix S18 to the Radio Regulations. Additional VHF channels outside those defined by appendix S18 to the Radio Regulations may also be provided, but means shall be provided to block any of these additional channels, as may be required by appropriate Administrations [add footnote for US channels].

Class 3 radios shall be capable of operation on the frequency 156.800 MHz (VHF channel 16) and on at least one additional channel as defined in Appendix S18 to the Radio Regulations. In addition Class 3 radios may operate on other single- frequency (simplex) voice communication only channels as defined in the Radio Regulations.

It shall not be possible for the user to unblock any blocked channels. (See also ITU-R Recommendation M.1084-4.)

The equipment shall be so designed that use of channel 70 for purposes other than DSC is prevented.

It shall not be possible to transmit while any frequency synthesizer used within the transmitter is out of lock.

It shall not be possible to transmit during channel switching operations.

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4.6 Controls and indicators

The user shall not have access to any control which, if wrongly set, might impair the technical characteristics of the equipment.

The following controls or functions shall be provided:

– DISTRESS BUTTON (see 4.6 5 .3): the default shall be an undesignated distress message;

– CALL / ENTER BUTTON (see 4.6 5 .1): the default (initial display) shall be an individual call . When in other parts of the Menu this button functions as Enter/Accept/OK for that menu function ;

– CANCEL / CLEAR : to revert to the initial display or to silence the aural alarm and visual indication used to indicate receipt of a DSC alert. The cancel function shall take place automatically after a maximum of 5 min of inactivity;

– a means of easily entering an MMSI for calling and manual position information. If a numeric key pad is provided this shall conform to ITU-T Recommendation E.161;

– ALPHA – NUMERIC DISPLAY (see 4.7 6 );

– on/off control switch with a visual indication that the installation is in operation;

– a manual non-locking push-to-talk switch to operate the transmitter with a visual indication that the transmitter is activated and facilities to limit the maximum transmission time to 5 min;

– a switch for reducing transmitter output power to no more than 1 W, on both telephony and DSC, with a visual indication that low power is selected. Transmission of DSC distress calls shall always be at full power;

– an audio frequency power volume control;

– a squelch function;

The equipment shall have means to select manually a channel and shall indicate the designator of the channel at which the installation is set.

All electronic displays, including the channel designator , distress button and numeric keypad (if fitted) , shall be legible irrespective of the external lighting conditions for at least 5 seconds upon activation of any control .

Channel 16 shall be distinctively marked. Selection of channel 16, shall be preferably by readily accessible means (e.g. a distinctively marked key). Selection of Channel 16 by any means shall automatically set the transmitter output power to maximum. This power level may subsequently be reduced by manual user control if required .

If a switch for reducing transmitter output power to no more than 1 W, on both telephony and DSC, with a visual indication that low power is selected is not provided then High and Low transmitter power settings for each channel shall be automatically selected as required by the Radio Regulations . Transmission of DSC distress calls shall always be at full power .

On the Class 3 radio Channel 16 shall be the default start up channel on the radio.

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4.7 DSC Calls TO BE UPDATED ONCE ITU CLASS D/H DISCUSSIONS CONCLUDED

4.7.1 Call functions

The facilities for coding and composition of calls shall be so arranged that it is possible for the operator quickly and precisely to enter a call. The types of DSC calls provided in this equipment are specified in annex A.

The CALL functions (see 4.5 4 ) shall permit selection of the following functions:

– INDIVIDUAL: for making a call to a specific MMSI;

– RECEIVED CALLS: for retrieving stored incoming DSC calls; NOTE Might miss DSC Rx Calls due to dual watch / scanning

- TEST: for making a DSC Test Call

– OTHER: for equipment housekeeping functions.

If INDIVIDUAL is selected, either a MANUAL call (see 4.6.2) or a DIRECTORY call shall be selected. The DIRECTORY list shall have a facility for at least 10 entries. Their MMSIs shall be programmable.

4.7.2 MANUAL calls

The MANUAL call facility shall permit the entry of an MMSI. If the called station is a coast station (i.e. MMSI commencing 00) no further information shall be requested from the operator. If the called station is a ship station the equipment shall request input of a channel number. The equipment shall assist the operator by suggesting a suitable inter-ship channel suitable for the vessels area of operation.

NOTE In Appendix S18 of the Radio Regulations channels 6, 8, 72 and 77 are reserved solely for inter-ship communications. Channels 9, 10, 13, 15, 17, 67, 69 and 73 may also be used for inter-ship communications but are also available for port operations and ship movement.

4.7.3 Distress calls

It shall only be possible to transmit distress DSC calls by means of a single dedicated button which is used for no other purpose. This button shall not be any key of ITU-T Recommendation E.161 digital input panel. This button shall be red in color and marked “DISTRESS”. Where a non-transparent protective lid or cover is used, it shall also be marked “DISTRESS”. The cover shall be protected against inadvertent operation with a spring loaded lid or cover permanently attached to the equipment by, for example hinges. It shall not be necessary for the user to remove seals or to break the lid or cover in order to operate the distress button.

The operation of the distress button shall generate a unique visible and audible indication ( see 5.6.3 ) . The distress button shall be kept pressed for at least 3 s in order to initiate a distress call. A flashing light and an intermittent acoustic signal shall start immediately. After the 3 s, the transmission of the distress alert is initiated and the indication shall become steady.

The distress alert initiation shall require at least two independent actions. Lifting the protective lid or cover is considered as the first action. Pressing the distress button is considered as the second independent action.

The nature of distress shall be the undesignated distress.

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Initiation of a distress call shall automatically have priority over any other operation of the equipment. The equipment shall automatically select channel 70 and the maximum transmitter power.

The distress call shall automatically be transmitted five times in succession with no intervals between the individual calls so that bit synchronization between the transmitter and receiver of the call can be maintained. Each call shall include the appropriate dot pattern. If position is not available from the internal GNSS Receiver then the distress call shall still be transmitted, but with default position.

Following the distress call sequence, a DSC expansion message giving enhanced position resolution according to ITU-R Recommendation M.821-1 shall be transmitted.

If position is not available from the internal GNSS Receiver then the DSC expansion message shall still be transmitted, but with default position. The radio shall automatically monitor the status of the internal GNSS Receiver output for a period of at least [5] minutes after the transmission of a distress call. If during this time a position (or updated position) is provided by the GNSS Receiver then the radio shall automatically repeat the distress call sequence followed by another DSC expansion message giving the position (updated position). Add GPS words about sending message even if not got location.

Check updated call status if send another call before / after acknowledgement

After the transmission of the distress call sequence, including the DSC expansion message, the equipment shall wait for a period of xx seconds to receive a distress acknowledgement before automatically tune to channel 16 and select the maximum transmitter power.

4.7.4 Distress Call Acknowledgement

Where no distress acknowledgement is received, the equipment shall automatically re-transmit the distress call attempt after a random delay of between 3,5 and 4,5 minutes from the beginning of the previous call.

This sequence shall be continued until a distress acknowledgement has been received, or until the automatic transmission of the distress call is discontinued manually.

4.7.5 Incoming calls

The DSC equipment shall be provided with suitable facilities for converting incoming calls with relevant address content to visual form in plain language. The contents of at least the last 10 received DSC calls shall be stored in the RECEIVED CALL menu .

In the case of incoming distress and urgency calls the radiotelephone shall automatically switch to channel 16 and automatically select the maximum transmitter power. For other calls the user shall be provided with a visual indication that a channel change is requested and if the user acknowledges the call then the radio shall automatically change to that channel.

4.8 DSC d D isplay

Class 1 and 2 The equipment shall shall be provided with facilities which show the functions currently available, prompts the operator if an incorrect operation is attempted, displays error messages and displays incoming and logged calls.

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Class 1 and 2 The equipment shall shall be provided with facilities to display the current geographic position as determined by the GNSS processor. Display of geographic position and time shall be readily available. If provided Tthe DSC display must be capable of continuously displaying a complete enhanced position according to ITU-R M.821

There shall be an indication that unread received ( see 4.5.5 ) messages are present in memory.

The display should be easily read from a distance of 40 cm, the minimum display character size shall be 3.0 mm .

4.9 Microphone and loudspeaker

The equipment shall include integral a microphone and an integral loudspeaker functions . Where there are connections to external loudspeakers, these shall also relay acoustic alarms. During transmission in simplex operation the receiver output shall be muted.

4.10 Safety precautions

Measures shall be taken to protect the equipment against the effects of excessive current or excessive voltage.

Measures shall be taken to prevent any damage that might arise from an accidental reversal of polarity of the electrical power source.

Means shall be provided for earthing exposed metallic parts of the equipment.

The components and wiring in which the a.c. or d.c. voltage (other than radio-frequency voltage), produce, singly or in combination, peak voltages in excess of 50 V, shall be protected against any accidental access and shall be automatically isolated from all electrical power sources if the protective covers are removed. Alternatively, the equipment shall be constructed in such a way as to prevent access to components operating at such voltages unless an appropriate tool is used such as a nut-spanner or screwdriver. Conspicuous warning labels shall be affixed both inside the equipment and on the protective covers. No damage to the equipment shall occur when the antenna terminals are placed on open circuit or short circuit for the period permitted by the push-to-talk switch in 4.5 4 .

In order to provide protection against damage due to the build up of static voltages at the antenna terminals, there shall be a d.c. path from the antenna terminals to chassis not exceeding 100 k.

The information in programmable memory devices and the vessel's identity and information inherent to the DSC process shall be stored in non-volatile memory devices.

4.11 Battery

The battery shall be integrated in the equipment. In addition provision may be made to operate the equipment using an external power source.

The Class 3 radio shall be capable of operating with primary batteries , i n addition it may be capable of operating with secondary batteries. The Class 1 and 2 radios shall be capable of operating with either primary or secondary batteries.

4.11.1 Primary Batteries

Primary batteries shall have a shelf life of at least two years.

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Primary batteries or their container shall have a colour and marking as described in clause 4. 4 .

The capacity of the integral primary battery shall be sufficient to operate the equipment continuously for at least eight hours at any temperature condition (see clause 6.8.2 ) with a 1:9 transmit to receive duty cycle at the highest rated transmit power.

This duty cycle is defined as:

- 6 s transmit at full RF output power without modulation, 6 s reception with an RF input signal at the nominal frequency of the receiver at a level of +60 dBμV using normal test modulation (see clause 6.4); and

- the audio volume control of the receiver set at maximum followed by 48 s reception without input signal and the squelch control operational (muted).

Provisions shall be made for replacing the battery easily without the use of special tools and without degrading the performance of the equipment (particularly water tightness after re-assembly).

4.11.2 Secondary Batteries

If the equipment is capable of operation with secondary batteries , the associated battery charger shall be submitted for conformance testing with the equipment.

Secondary batteries or their container shall not have the same colour or marking as the primary batteries.

The capacity of the secondary battery shall be sufficient to operate the equipment continuously for at least five hours at any temperature condition (see clause 6.8.2) with a 1:9 transmit to receive duty cycle at the highest rated transmit power.

This duty cycle is defined as:

- 6 s transmit at full RF output power without modulation, 6 s reception with an RF input signal at the nominal frequency of the receiver at a level of +60 dBμV using normal test modulation (see clause 6.4); and

- the audio volume control of the receiver set at maximum followed by 48 s reception without input signal and the squelch control operational (muted).

The charger shall:

- have an indication to show that it is charging;

- have means to indicate when each battery has reached the fully charged condition;

- be able to fully charge discharged batteries in no more than 14 hours;

- automatically maintain fully charged batteries in a fully charged condition as long as the batteries remain in the charger

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4.12 Labell ing

All controls, instruments, indicators and terminals shall be clearly labeled.

Details of the power supply from which the equipment is intended to operate shall be clearly indicated on the equipment.

On Class 3 radios T t he compass safe distance shall be stated on the equipment or in the user document as described in IEC 60945.

4.13 Warm up

After being switched on, the equipment shall be operational within 5 s.

4.14 Internal Memory

DSC equipment shall contain an internal store with sufficient capacity for storing of at least 20 different received DSC distress calls and calls having distress category. Consecutive calls of a single frequency distress call attempt shall only be stored once.

The contents of the last received DSC messages shall remain stored until readout is initiated manually even when the radio is turned off .

Received messages shall be stored even if the received Error Check Character (ECC) does not match. An ECC error should be clearly indicated when the information in the received symbols is displayed.

Any entries in the DIRECTORY shall remain stored in the radio even when the radio is turned off or the battery removed.

The radios own MMSI shall remain stored in the radio even when the radio is turned off or the battery removed.

5 Technical requirements

5.1 Switching time

The channel switching arrangement shall be such that the time necessary to change over from using one of the channels to using any other channel does not exceed 5 s.

The time necessary to change over from transmission to reception or vice versa, shall not exceed 0,3 s.

5.2 Class of emission and modulation characteristics

The equipment shall use phase modulation, G3E (frequency modulation with pre-emphasis of 6 dB/octave) for speech, and G2D B for DSC signaling.

The equipment shall be designed to operate with a channel separation of 25 kHz. Other channel spacings are allowed if permitted by appropriate national Administrations (see ITU-R Recommendation M.1084-4).

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5.3 Facilities for DSC transmission and reception

5.3.1 General

The equipment shall include the necessary facilities for coding and transmission of DSC on channel 70 and for decoding and conversion of the information content of received DSC . to visual form in plain language.

The watchkeeping facility part of the DSC equipment shall be designed for continuous DSC monitoring on channel 70 but need not operate when the transmitter is in use.

5.3.2 Decoding

The DSC equipment shall be so designed that in the decoding process use shall be made of the phasing sequence, of parity bits for error detection, time diversity repetitions and error check characters in the received call as specified in ITU-R Recommendation M.493-11.

5.3.3 Clear Free channel transmission

The DSC equipment shall be provided with facilities which, except for distress calls, automatically delay the transmission of DSC until the calling channel 70 is clear free .

5.3.4 Automatic acknowledgement

The equipment shall not be provided with facilities for automatic transmission of acknowledgements to routine calls and others? (check Class D / H requirements) .

5.3.5 Automatic re-transmission of distress calls

The equipment shall not be provided with facilities for automatic re-transmission of distress calls , except in the case where a distress call does not contain a position, in which case a second distress call may be made if a position is subsequently available from the internal GNSS Receiver .

5.4 Ships identity – MMSI and Group MMSI

The equipment shall be capable of storing permanently storing the ship's 9-digit Maritime Mobile Service Identity (MMSI) number which shall be inserted automatically in the call.

After the MMSI has been stored, it shall not be possible to change the identity number using any combination of operator controls. The radio ’s ship’s MMSI shall be readily accessible. to the operator, either displayed at equipment power-up, or by a simple action of the operator.

5.5 Position information

An internal GNSS processor shall be provided to automatically encode geographical position into the DSC message and time .

5.5.1 Internal navigation device performance

The internal navigation device shall be capable of global operation and shall conform to the following sections of IEC 61108-1 Ed2.0 (as amended) .

Static Position Accuracy (5.6.4.1.1)

Static Position Accuracy under Angular Movement (5.6.4.2)

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Dynamic Position Accuracy (5.6.4.3)

Acquisition Times (Cold Start, Warm Start and Reacquisition) (5.6.5)

Short Circuit Protection (5.6.6)

Receiver Sensitivity (during both Acquisition and Tracking) (5.6.8)

Interference Immunity (5.6.9)

Position Update (5.6.10)

The internal navigation device shall incorporate self-check features to ensure that erroneous position data is not encoded into the DSC message. The self-check features shall prevent position data from being encoded into the DSC message unless minimum performance criteria are met. The manufacturer shall include details of how this is achieved in the provided test documentation. These details could include the proper internal functioning of the device, the presence of a sufficient number of navigation signals, sufficient quality of the signals, and sufficiently low geometric dilution of precision to ensure that positions with an error of greater than [ 500 ] m are not encoded into the beacon message . The internal navigation device may be ‘warm’ started (i.e. retain time and / or position dependant data in memory) when the radio is turned on , provided that it is less than [ 3 months ] since the last time that a position was acquired and stored in memory. If the last time that a position was acquired and stored in memory was more than [ 3 months ] ago then a ‘ cold ’ start shall be forced and the GNSS Receiver shall be reset such that any time dependent or position dependent data in memory is deleted .

The distance between the position provided by the navigation device, at the time of the position update, and the true radio position shall not exceed [ 500 ] m .

The internal navigation device shall provide valid data within [ 5 ] minutes after activation of the radio under good navigation reception conditions when ‘warm’ starting and within [ 10 ] minutes when ‘cold’ starting .

5.5.2 Internal navigation device timing

The internal navigation device within the VHF radio shall be activated immediately after the radio is turned on. Once the navigation device acquires its first valid position 'fix’ this should be stored in the radios memory ready to be encoded into a DSC message (or displayed on the radio) . Any subsequently acquired valid position fixes shall update the position stored in the radios memory. Between each attempt to obtain a fix the navigation device may be put in to a sleep mode that retain s ephemeris and / or almanac data, such that when it is subsequently woken up it ‘ warm ’ starts . The navigation device shall attempt to update its position at least once every [ 30 ] minutes. Failure to update the position shall result in a warning alarm to indicate to the operator of the radio that an ‘old’ position is stored in the radio. No position shall be stored in the radio for more than [ 4 ] hours without being updated, if after [ 4 ] hours the position has not been updated then the stored position shall be erased from memory and a warning alarm shall indicate to the operator of the radio that a valid position is no longer available .

5.6 Alarm circuits for incoming calls

5.6.1 Distress and urgency

The equipment shall be provided with a specific acoustic alarm and a visual indication, activated automatically when a call with format specifier distress or category distress or urgency has been received. It shall not be possible to disable these alarm circuits.

The alarm for distress and urgency calls should be distinguishable from the tone for safety and routine calls. The alarm should not be activated where duplicate d D istress relay calls and distress

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relay calls on behalf of someone else shall be ignored. are received within 1 h. A duplicate distress relay call is one having format specifier all ships or geographic area that contains identical message information to that of the initiating distress alert, and an identical distress MMSI.

5.6.2 Other categories

The equipment may shall be provided with an acoustic alarm and a visual indication, activated automatically on receipt of calls of categories other than distress and urgency. It shall not be possible to disable the acoustic alarm circuit.

5.6.3 Cancellation of alarms

A means of manual cancellation of alarms shall be provided. In the event that an alarm is not cancelled manually, then automatic cancellation shall take place after 2 min.

5.6.4 Acoustic alarm power

The acoustic alarm shall initially be of a level power that is clearly distinguishable, but does not interfere with, radiotelephone communications. If not manually cancelled within 10 s, the power should rise to a level of at least 80 dB(A) at a distance of 1 m from the equipment before automatic cancellation.

5.7 Multiple watch facilities

5.7.1 General

The VHF radiotelephone equipment shall may be provided with multiple dual watch facilities on at least channels 16 and 70 traffic channels but transmission of operation using DSC shall always take precedence. Other scanning or tri watch facilities may be included in the radio but are not mandatory.

DUAL WATCH features after sending distress call vs before sending etc.

5.7.2 Scanning provisions DO WE WANT TO RETAIN OR DELETE THIS SECTION? No see above

Equipment having multiple watch facilities shall as a minimum comply with the following:

– the equipment shall include a provision for the automatic scanning of a priority channel and one additional channel. Facilities for the automatic sequential change of any the additional channels may be provided;

– the priority channels are those is that channels which will be sampled even if there is a signal on the additional channel and on which the receiver will lock during the time a signal is detected;

– the additional channel is that channel which will be monitored during the periods the equipment is not sampling or receiving signals on the priority channel;

– provision shall be included to switch the scanning facility on and off by means of a manually operated control. In addition, it shall be ensured that the receiver remains on the same channel as the transmitter for the entire duration of any communication, [for example the scanning facility may be switched off automatically when the handset is off its hook ];

– If selection of the priority channel is not provided, the priority channel shall be channel 16;

– when the scanning facility is in operation, the channel number of both channels on which the equipment is operating shall be indicated;

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– in a transceiver, transmission shall not be possible when the scanning facility is operating. When the scanning facility is switched off, both transmitter and receiver shall be tuned automatically to the selected additional channel;

– a transceiver shall be provided with a single manual control (e.g. push-button) in order to switch the equipment quickly for operation on the priority channel;

– the selected additional channel shall be clearly indicated as being the operational channel of the equipment.

Additional scanning modes are permitted.

5.7.3 Scanning characteristics DO WE WANT TO RETAIN OR DELETE THIS SECTION? No see above

When the scanning facility is switched on, the priority channel shall be sampled with a sampling period of not more than 2 s.

If a signal is detected on the priority channel the receiver shall remain on this channel for the duration of that signal.

If a signal is detected on the additional channel, the sampling of the priority channel shall continue, thus interrupting the reception on the channel for periods as short as possible and not greater than 150 ms.

The design of the receiver shall provide for its proper functioning during the period the priority channel is sampled since the receiving conditions on the priority channel may differ from those on the additional channel.

In the absence of a signal on the priority channel, and, during reception of a signal on the additional channel, the duration of each listening period on this channel shall be at least 850 ms.

Means shall be provided to indicate the channel on which a signal is being received.

5.8 Built-in test

A built-in test facility for the DSC processor shall be provided. What does this mean?

6 General conditions of measurement

6.1 Power Supply

Electrical power shall be supplied during performance tests normally by the batteries which form a part of the equipment. For type-approval tests, a minimum of three sets of batteries shall be submitted. A log of battery on-time shall be maintained for the radio under test. Batteries shall not be replaced unless it is probable that the battery on-time will exceed the prescribed operating life time of the radio before the test is complete. In any case batteries shall not be replaced during a test. If the batteries fail during a test new batteries shall be fitted and the test repeated from the beginning.

6.2 Warm-up Period

The requirements of this standard shall be met after a maximum warm-up period of [ 5 ] min.

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6.3 Instructions

Adequate information shall be provided to enable the equipment to be properly set up, maintained and operated during the type testing.

6.4 Additional Facilities / Supplemental Devices

If the equipment contains any additional facilities or supplemental devices, they shall be operational for the duration of all tests, except if specified otherwise. Additional testing may be required if additional facilities and/or supplemental devices are incorporated within the radio . If not specifically addressed within this standard additional testing requirements shall be addressed on a case-by-case basis to the appropriate national authorities before the commencement of any tests.

6.5 Audible and Visual Indications

During testing, all audible and visual indications including any alarms, indicators, displays and audio outputs (if fitted) shall be operational.

6.6 Preparation of VHF Radio for type-approval testing

Two radios shall be provided by the manufacturer for testing purposes, together with the batteries required by 6.1 .

Both radios shall be a fully packaged similar to the proposed production radios , operating on their normal power source and equipped with their proper antenna. The manufacturer shall document any changes or variations from the planned production radios .

Both radios shall be configured so that the antenna port can be connected to the test equipment by a coaxial cable terminated by a 50 load instead of the proper antenna where required by the tests .

No adjustments are permitted to the radios under test throughout the complete test program. Except as specifically specified by the test procedures, or in order to replace the batteries or change the antenna connection, the radios shall not be opened during the test program .

6.7 Measurements and Observations

The values of all parameters of the radio under test shall be measured or observed during each of the tests prescribed in this standard and shall be duly recorded and submitted to the appropriate national authority as part of the required type approval testing data set. Any failures or repeated tests shall be recorded. The measurement accuracy of each value (or set of values) shall also be reported in the test data. A complete summary of the test results shall also be submitted to the appropriate national authority.

6.8 Test Conditions

Tests shall be carried out under normal test conditions, unless otherwise stated.

6.8.1 Normal test conditions

Normal temperature and humidity conditions for tests shall be any convenient combination of temperature and humidity within the following ranges:

Temperature: +15°C to +35°C

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Relative humidity: 20% to 75%

6.8.2 Extreme test conditions

For tests at extreme temperatures, measurements shall be made in accordance with the procedure specified in IEC 60945.

Applicable operational temperature range: –20°C to +55°C

6.9 Equipment C lass

The equipment manufacturer shall declar e the class of the VHF radio (as defined in paragraph 4.2 ) .

For the purposes of IEC 60945 the equipment category is defined as Portable.

6.10 Performance Check

For the purposes of IEC 60945 and this standard a performance check consists of measuring the following parameters using suitable test equipment:

a) XXX ;

b) YYY ; and

c) ZZZ.

6.11 Performance Test

For the purposes of IEC 60945 and this standard a performance test consists of measuring the following parameters:

a) XXX ;

b) YYY ; and

c) ZZZ.

6.12 Pre-conditioning and Post Examination for Environmental Tests

Prior to testing, the VHF radios shall be visually inspected for any signs of damage and a performance check shall be made. No other preconditioning is required unless specifically detailed within each environmental test herein.

After each environmental test, the equipment shall be inspected for any mechanical deterioration and/or for water penetration and a performance check shall be made.

6.13 SEQUENCE OF TESTS

6.13.1 Environmental Tests

The following environmental and operational tests shall be conducted in the sequence as stated here below. All tests shall be performed on the first test sample .

Compulsory sequence of tests

1 Dry heat tests (see XX ) 2 Damp heat test (see XX )

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3 Low temperature tests (see XX ) 4 Vibration tests (see XX ) 5 Bump test (see XX ) 6 Drop test (see XX ) 7 Thermal shock test (see XX ) 8 Immersion test (see XX ) 9 Electromagnetic Compatibility and Spurious emission s tests (see XX ) 10 Operational Life (Battery capacity) (see XX )

Additional tests

The following tests may be run in any sequence:

1 1 Buoyancy Test (C lass 2 and 3 VHF Radios only) (see XX ) 1 2 Solar Radiation (see XX ) 1 3 Oil Resistance (see XX ) 1 4 Corrosion (salt mist) test (see XX ) 1 5 Compass Safe Distance (Class 3 VHF Radio only) (see XX ) 1 6 Miscellaneous tests (see XX )

6.13.2 Electrical Performance Tests

The following electrical and operational tests shall be conducted in the sequence as stated here below. All tests shall be performed on the second test sample.

Compulsory sequence of tests ( Following section to be amplified )

1 Transmitter (see XX) 2 Radio Receiver (see XX) 3 DSC Receiver (see XX)

7 Environmental tests

8 Transmitter

9 Radiotelephone receiver

10 Receiver for DSC decoder

11 Electromagnetic capability

12 Documentation

d) The manufacturer should provide an operation manual including the following:

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Annex A (normative)

Types of DSC Calls

A.1 DSC Calls

Insert types of calls permitted by Class D / H here.

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Annex B (informative)

Intellectual Property

B.1 Policy

It is the intent of the Radio Technical Commission for Maritime Services (RTCM) to develop standards that do not require the use of patented technologies as the only means to comply with a standard (essential patents).

B.2 Essential patented technologies

RTCM has not been informed of any patented technologies that must be used in order to design or produce equipment covered by this standard.

B.3 Non-essential patented technologies

RTCM has been informed of the patented technologies listed in Table C.1 that may be used in the design and production of equipment covered by this standard. However, RTCM believes it is possible to design and produce equipment covered by this standard without using any of the patented technologies listed in the table.

Table C.1 is provided for the information of users of this standard. RTCM takes no responsibility for the accuracy or completeness of this list.

Table C.1 – Non-essential patents

Issuing Country

Patent Number

Patent Holder Brief Description(See Note)

NOTE: Do not rely on this summary as a complete description of the technology. See patent documents for a full description.