SIST ETS 300 373:1999
(Main)Radio Equipment and Systems (RES); Technical characteristics and methods of measurements for maritime mobile transmitters and receivers for use in the MF and HF bands
- Abstract
DE/RES-01-03
- Status
- Published
- Publication Date
- 30-Sep-1999
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Oct-1999
- Due Date
- 01-Oct-1999
- Completion Date
- 01-Oct-1999
SIST ETS 300 373:1999 is the Slovenian adoption of ETS 300 373 Edition 1 from ETSI. It specifies the minimum technical characteristics and measurement methods for maritime mobile transmitters and receivers used on ships in the MF and MF/HF bands, including SSB telephony and DSC-related operation.
This standard is for shipboard radio equipment in the Maritime Mobile Service (MMS), so it is the document used to design, test, and compare maritime MF and MF/HF sets against a common technical baseline.
What does SIST ETS 300 373:1999 specify?
SIST ETS 300 373:1999 specifies shipborne radio equipment for operation in the Medium Frequency (MF) band or in the Medium and High Frequency (MF/HF) bands allocated to MMS. It covers equipment for SSB telephony and for DSC signaling using FSK or SSB modulation of a keyed sub-carrier, and it also covers equipment that interfaces with a separate DSC encoder or decoder.
The scope reaches receivers intended for the bands from 1 605 kHz to 4 000 kHz, and for 1 605 kHz to 27,5 MHz where applicable. It also states that equipment used for other maritime radiocommunication services should meet the relevant standards for those services.
The document is organized into these main parts:
- Clause 1: Scope
- Clause 2: Normative references
- Clause 3: Definitions, abbreviations and symbols
- Clause 4: General requirements
- Clause 5: Test conditions
- Clause 6: Environmental tests
- Clause 7: Transmitter
- Clause 8: Receiver
What are the key requirements of SIST ETS 300 373:1999?
General equipment design and operator usability
Clauses 4.1 to 4.4 cover construction, controls and indicators, labels, and safety precautions. SIST ETS 300 373:1999 expects the equipment to be laid out for inspection and maintenance, to have readable illumination where needed, antenna static protection, suitable audio-frequency interfaces, and antenna matching provisions. In practice, this affects how the set is built, installed and serviced on board.
The controls and indicators must support safe operation in distress and routine use. Clause 4.2 includes requirements for ease of use, loudspeaker switching, frequency indication, synthesiser lock, channel switching, distress controls, control-panel priority, and manual gain control and Automatic Gain Control (AGC). For a buyer or installer, this means the front panel has to be practical for shipboard use, not just electrically correct.
Emission classes and operating bands
Clause 4.5 defines the emission classes that the equipment has to handle. J3E is the normal SSB telephony mode with strong carrier suppression, H3E is allowed only on 2 182 kHz and for on-board test use on 2 200 kHz, and F1B is used for DSC with a specified frequency shift. J2B is also allowed as an alternative for DSC with a 1 700 Hz sub-carrier.
Clause 4.6 limits the equipment to MF or MF/HF operation, and clause 4.7 addresses warm-up period and heater arrangements. In practice, these clauses tell the manufacturer which maritime radio modes the set must support and which frequencies and operating conditions the design has to cover.
Operating instructions and serviceability
Clause 4.8 requires adequate and detailed operation and maintenance instructions. Repair instructions and accessibility are part of that requirement. For users, this means the equipment should come with information that supports onboard operation, routine checks and practical servicing.
Test conditions and test methods
Clause 5 sets the test conditions used to verify conformance. It defines normal and extreme temperature and power-source conditions, artificial antennas, standard test signals, and how measurement uncertainty is handled. This matters because the same radio can be judged consistently in different laboratories.
The section also defines the standard test signals for J3E, H3E and F1B and the choice of testing frequencies. For receiver testing, those signals create repeatable conditions so that sensitivity, selectivity and distortion can be compared across equipment.
Environmental robustness
Clause 6 requires environmental testing for vibration, temperature, damp heat, corrosion and rain. The equipment is expected to continue operating under shipboard conditions such as sea states, humidity and temperature changes.
Clause 6.3 defines a performance check during environmental tests. It checks transmitter frequency error and output power at 2 182 kHz, and receiver maximum usable sensitivity using AGC and a defined test signal. In practice, this shows whether the equipment still performs acceptably after exposure to harsh conditions.
Transmitter performance
Clause 7 covers transmitter characteristics such as frequency error, output power, intermodulation products, unwanted frequency modulation, microphone sensitivity, 600 Ω line input sensitivity, audio-frequency response, out-of-band emissions, conducted spurious emissions, residual hum and noise, residual frequency modulation on DSC, carrier suppression, continuous operation, protection of the transmitter, and radiotelephone alarm signal requirements.
These checks matter because they show whether the transmitter stays on frequency, delivers the intended output, and avoids interfering emissions. For distress and DSC functions, they also verify the tone frequency, tone duration and modulation depth of the alarm signal.
Receiver performance
Clause 8 covers receiver output power, frequency error, unwanted frequency modulation, pass band, maximum usable sensitivity, adjacent-signal selectivity, blocking, cross modulation, intermodulation, reciprocal mixing, spurious response rejection, harmonic content in the output, audio-frequency intermodulation, spurious emissions, internally generated spurious signals, AGC efficiency and AGC time constants, plus protection of input circuits.
In practice, these requirements show whether the receiver can detect weak maritime signals while resisting overload from nearby strong signals and internal noise. That is especially important for shipboard installations where many transmitters and antennas can be close together.
What terms does SIST ETS 300 373:1999 define?
- Assigned frequency - the centre frequency of the band assigned to a station.
- Carrier frequency - the frequency to which the transmitter or receiver is tuned.
- Automatic Gain Control (AGC) - receiver gain control that adjusts automatically as signal level changes.
- Digital Selective Calling (DSC) - maritime signaling used for selective calling and distress-related communication.
- Frequency Shift Keying (FSK) - digital modulation that uses frequency shifts to represent information, used here for DSC.
- Single SideBand (SSB) - telephony transmission using one sideband, with the carrier suppressed or reduced depending on the class.
- Signal-to-Noise Ratio (SNR) - the ratio used to judge wanted signal level against noise at the receiver output.
- J3E / H3E / F1B - emission symbols used in the standard for SSB telephony and DSC-related operation.
Who uses SIST ETS 300 373:1999?
SIST ETS 300 373:1999 is used by manufacturers of maritime radio transmitters and receivers, test laboratories, certification bodies, ship equipment buyers, and marine radio installers and maintainers. It is also relevant to ship operators and technical managers who need to verify that MF and MF/HF radio sets meet the expected shipboard performance and safety features.
In practice, these users apply it when designing equipment, setting up laboratory measurements, checking environmental endurance, preparing technical documentation, and confirming that distress and DSC-related functions behave as required.
Which standards are used with SIST ETS 300 373:1999?
The standard refers to several external publications that shape its technical and regulatory framework:
- ITU Radio Regulations - defines the maritime bands, emissions and spectrum rules used by the standard.
- CCITT Recommendation E.161 - supports arrangement of figures, letters and symbols on telephone-style devices.
- SOLAS - provides the maritime safety framework that the equipment has to fit.
- IMO Resolutions A.421(XI), A.610(15), A.613(15) and A.694(17) - bring in maritime safety and performance expectations.
- ITU-R Recommendation 493-5 - defines the DSC system used in the Maritime Mobile Service.
- NMEA 0183, Version 2.00 - supports interfacing with marine electronic devices.
- ISO Standard 3791 - provides numeric keyboard layout guidance.
- ETR 028 - gives measurement uncertainty guidance for mobile radio equipment.
- ETS 300 067 - is the related standard for maritime MF/HF radiotelex equipment.
What does the SIST ETS 300 373:1999 document contain?
SIST ETS 300 373:1999 contains detailed test conditions for normal and extreme temperature, humidity, power-source variation, artificial antennas and standard test signals. It also sets out how measurement uncertainty is handled so that test results can be interpreted consistently.
The document then gives method-and-limit sequences for transmitter and receiver measurements. These include frequency error, output power, emissions, sensitivity, selectivity, blocking, AGC behavior, spurious emissions, and alarm-signal characteristics.
It also includes environmental test procedures for vibration, dry heat, damp heat, low temperature, corrosion and rain, together with a performance check during environmental exposure. That makes the standard useful not only for design verification but also for type testing and shipboard suitability checks.
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Frequently Asked Questions
SIST ETS 300 373:1999 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Radio Equipment and Systems (RES); Technical characteristics and methods of measurements for maritime mobile transmitters and receivers for use in the MF and HF bands". This standard covers: DE/RES-01-03
DE/RES-01-03
SIST ETS 300 373:1999 is classified under the following ICS (International Classification for Standards) categories: 33.060.20 - Receiving and transmitting equipment; 47.020.70 - Navigation and control equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 373:1999 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-1999
5DGLMVNDRSUHPDLQVLVWHPL 5(6 7HKQLþQHNDUDNWHULVWLNHLQPHULOQHPHWRGH]D
SRPRUVNHPRELOQHRGGDMQLNHLQVSUHMHPQLNH]DXSRUDERQDVUHGQMHYDORYQHP 0)
LQNUDWNRYDORYQHP +) SRGURþMX
Radio Equipment and Systems (RES); Technical characteristics and methods of
measurements for maritime mobile transmitters and receivers for use in the MF and HF
bands
Ta slovenski standard je istoveten z: ETS 300 373 Edition 1
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
47.020.70 Navigacijska in krmilna Navigation and control
oprema equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 373
TELECOMMUNICATION August 1995
STANDARD
Source: ETSI TC-RES Reference: DE/RES-01-03
ICS: 33.060.20
maritime, radiotelephony
Key words:
Radio Equipment and Systems (RES);
Technical characteristics and methods of measurement for
maritime mobile transmitters and receivers for
use in the MF and HF bands
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
Copyright Notification: No part may be reproduced except as authorized by written permission. The copyright and the
foregoing restriction extend to reproduction in all media.
© European Telecommunications Standards Institute 1995. All rights reserved.
New presentation - see History box
Page 2
ETS 300 373: August 1995
Whilst every care has been taken in the preparation and publication of this document, errors in content,
typographical or otherwise, may occur. If you have comments concerning its accuracy, please write to
"ETSI Editing and Committee Support Dept." at the address shown on the title page.
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ETS 300 373: August 1995
Contents
Foreword .9
1 Scope .11
2 Normative references.11
3 Definitions, abbreviations and symbols.12
3.1 Definitions .12
3.2 Abbreviations .12
3.3 Symbols .12
4 General requirements .13
4.1 Construction.13
4.1.1 Design .13
4.1.2 Inspection and maintenance .13
4.1.3 Illumination .13
4.1.4 Antenna static protection.13
4.1.5 Digital input panels .13
4.1.6 Audio frequencies interfaces.13
4.1.7 Antenna matching .14
4.2 Controls and indicators .14
4.2.1 General.14
4.2.2 Ease of use .14
4.2.3 Loudspeaker switching.14
4.2.4 Noise reducer.15
4.2.5 Frequency indication and class of emission.15
4.2.6 Synthesiser lock .15
4.2.7 Channel switching .15
4.2.8 Distress controls.15
4.2.9 Telephony transmit control.15
4.2.10 Misuse .15
4.2.11 Control panel priority .15
4.2.12 Manual gain control and Automatic Gain Control (AGC).15
4.2.13 Output indication .16
4.3 Labels .16
4.3.1 General.16
4.3.2 Power supplies .16
4.3.3 Distress frequencies.16
4.3.4 Manufacturer .16
4.3.5 Compass safe distance.16
4.4 Safety precautions .16
4.4.1 Protection .16
4.4.2 Earthing .16
4.4.3 Access.17
4.4.4 Memories.17
4.5 Classes of emission.17
4.6 Frequency bands .17
4.6.1 MF band .17
4.6.2 HF bands.17
4.7 Warming up period .17
4.7.1 Time .17
4.7.2 Heaters.18
4.7.3 Heating circuits.18
4.7.4 Delay .18
4.8 Instructions.18
4.8.1 Repair instructions.18
4.8.2 Accessibility.18
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ETS 300 373: August 1995
5 Test conditions. 18
5.1 General. 18
5.2 Test power source. 18
5.3 Normal test conditions. 19
5.3.1 Normal temperature and humidity . 19
5.3.2 Normal test power source. 19
5.3.2.1 Mains voltage and frequency . 19
5.3.2.2 Secondary battery power sources. 19
5.3.2.3 Other power sources. 19
5.4 Extreme test conditions. 19
5.4.1 Extreme temperature tests . 19
5.4.2 Extreme values of test power source . 19
5.4.2.1 Mains voltage and mains frequency. 19
5.4.2.2 Secondary battery power sources. 19
5.4.2.3 Other power sources. 19
5.5 Artificial antennas. 20
5.5.1 Transmitters. 20
5.5.2 Receivers. 20
5.6 Standard test signals. 20
5.6.1 Test signals applied to the receiver input . 20
5.6.1.1 Sources. 20
5.6.1.2 Levels. 20
5.6.2 Normal test signals . 20
5.6.2.1 Class of emission J3E. 20
5.6.2.2 Class of emission H3E (2 182 kHz only). 21
5.6.2.3 Class of emission F1B . 21
5.6.3 Choice of testing frequencies . 21
5.7 Measurement uncertainty and interpretation of the measuring results. . 21
5.7.1 Measurement uncertainty . 21
5.7.2 Interpretation of measurement results. 21
6 Environmental tests . 22
6.1 Introduction. 22
6.2 Procedure. 22
6.3 Performance check . 22
6.4 Vibration test . 23
6.4.1 Method of measurement. 23
6.4.2 Requirement . 23
6.5 Temperature tests. 23
6.5.1 General . 23
6.5.2 Dry heat . 23
6.5.2.1 Internally mounted equipment. 23
6.5.2.1.1 Method of measurement . 23
6.5.2.1.2 Requirement. 24
6.5.2.2 Externally mounted equipment. 24
6.5.2.2.1 Method of measurement . 24
6.5.2.2.2 Requirement. 24
6.5.3 Damp heat . 24
6.5.3.1 Method of measurement. 24
6.5.3.2 Requirement . 25
6.5.4 Low temperature cycle. 25
6.5.4.1 Internally mounted equipment. 25
6.5.4.1.1 Method of measurement . 25
6.5.4.1.2 Requirement. 25
6.5.4.2 Externally mounted equipment. 25
6.5.4.2.1 Method of measurement . 25
6.5.4.2.2 Requirement. 25
6.6 Corrosion test. 26
6.6.1 General . 26
6.6.2 Method of measurement. 26
6.6.3 Requirements . 26
6.7 Rain test . 27
6.7.1 General . 27
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ETS 300 373: August 1995
6.7.2 Method of measurement .27
6.7.3 Requirements.27
7 Transmitter .27
7.1 General .27
7.1.1 Output power reduction .27
7.1.2 Class of emission .27
7.1.3 Class of emission on the distress frequency 2 182 kHz.28
7.1.3.1 Initial selection .28
7.1.3.2 Subsequent use.28
7.1.4 Radiotelephone alarm signal generator .28
7.1.5 Minimum number of operating frequencies.28
7.1.5.1 Transmitters operating between 1 605 - 4 000 kHz only .28
7.1.5.2 Transmitters operating between 1 605 - 27 500 kHz.28
7.2 Frequency error .28
7.2.1 Definition .28
7.2.2 Method of measurement .28
7.2.3 Limits.29
7.3 Output power and intermodulation products.29
7.3.1 Definitions.29
7.3.2 Method of measurement .29
7.3.3 Limits.30
7.3.3.1 Output power in the range 1 605 - 4 000 kHz for all
modulation modes .30
7.3.3.2 Output power in the range 4 - 27,5 MHz for all modulation
modes.30
7.3.3.3 Intermodulation products for SSB telephony modes .30
7.3.3.4 Difference of power of B-state frequency and Y-state
frequency.30
7.3.3.5 Output spectrum.31
7.4 Unwanted frequency modulation .31
7.4.1 Definition .31
7.4.2 Method of measurement .31
7.4.3 Limits.32
7.5 Sensitivity of the microphone.32
7.5.1 Definition .32
7.5.2 Method of measurement .32
7.5.3 Limits.32
7.6 Sensitivity of the 600 Ω line input for SSB telephony.32
7.6.1 Definition .32
7.6.2 Method of measurement .32
7.6.3 Limits.32
7.7. Automatic level control and/or limiter for SSB telephony.32
7.7.1 Method of measurement .32
7.7.2 Limits.33
7.8 Audio frequency response of SSB telephony .33
7.8.1 Definition .33
7.8.2 Method of measurement .33
7.8.3 Limits.34
7.9 Power of out-of-band emissions of SSB telephony .34
7.9.1 Definition .34
7.9.2 Method of measurement .34
7.9.3 Limits.35
7.10 Power of conducted spurious emissions of SSB telephony.35
7.10.1 Definition .35
7.10.2 Method of measurement .35
7.10.3 Limits.35
7.11 Residual hum and noise power for telephony.35
7.11.1 Definition .35
7.11.2 Method of measurement .36
7.11.3 Limits.36
7.12 Residual frequency modulation on DSC.36
7.12.1 Definition .36
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ETS 300 373: August 1995
7.12.2 Method of measurement. 36
7.12.3 Limits . 36
7.13 Carrier suppression. 36
7.13.1 Definition. 36
7.13.2 Method of measurement. 36
7.13.3 Limits . 37
7.14 Continuous operation on telephony. 37
7.14.1 Definition. 37
7.14.2 Method of measurement. 37
7.14.3 Limits . 37
7.15 Protection of transmitter. 37
7.15.1 Definition. 37
7.15.2 Method of measurement. 37
7.15.3 Limits . 37
7.16 Radiotelephone alarm signal requirements. 37
7.16.1 Frequency and duration of tones . 37
7.16.1.1 Definition . 37
7.16.1.2 Method of measurement. 38
7.16.1.3 Limits. 38
7.16.2 Duration of the alarm signal. 38
7.16.2.1 Definition . 38
7.16.2.2 Method of measurement. 38
7.16.2.3 Limit. 38
7.16.3 Modulation depth . 38
7.16.3.1 Definition . 38
7.16.3.2 Method of measurement. 38
7.16.3.3 Limit. 38
8 Receiver. 38
8.1 Receiver output powers. 38
8.1.1 Standard output power . 38
8.1.2 Rated output power . 39
8.2 Frequency error. 39
8.2.1 Definition. 39
8.2.2 Method of measurement. 39
8.2.3 Limits . 39
8.3 Unwanted frequency modulation. 39
8.3.1 Definition. 39
8.3.2 Method of measurement. 39
8.3.3 Limits . 40
8.4 Pass band . 40
8.4.1 Definition. 40
8.4.2 Method of measurement. 40
8.4.2.1 Class of emission J3E. 40
8.4.2.2 Class of emission H3E. 40
8.4.3 Limits . 40
8.5 Maximum usable sensitivity. 40
8.5.1 Definition. 40
8.5.2 Methods of measurement. 41
8.5.3 Limits . 41
8.6 Adjacent signal selectivity . 41
8.6.1 Definition. 41
8.6.2 Method of measurement. 41
8.6.3 Limits . 42
8.7 Blocking. 42
8.7.1 Definition. 42
8.7.2 Method of measurement. 42
8.7.3 Limits . 43
8.8 Cross modulation . 43
8.8.1 Definition. 43
8.8.2 Method of measurement. 43
8.8.3 Limits . 43
8.9 Intermodulation. 44
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ETS 300 373: August 1995
8.9.1 Definition .44
8.9.2 Method of measurement .44
8.9.2.1 Class of emission J3E. .44
8.9.2.2 Class of emission H3E .44
8.9.2.3 Class of emission F1B analogue.44
8.9.2.4 Class of Emission F1B digital .45
8.9.3 Limits.45
8.10 Reciprocal mixing .45
8.10.1 Definition .45
8.10.2 Method of measurement .45
8.10.3 Results .46
8.11 Spurious response rejection ratio .46
8.11.1 Definition .46
8.11.2 Method of measurement .46
8.11.3 Limits.47
8.12 Harmonic content in output.47
8.12.1 Definition .47
8.12.2 Method of measurement .47
8.12.3 Limits.48
8.13 Audio frequency intermodulation .48
8.13.1 Definition .48
8.13.2 Method of measurement .48
8.13.3 Limits.48
8.14 Spurious emissions.48
8.14.1 Definition .48
8.14.2 Methods of measurement .48
8.14.3 Limits.48
8.15 Internally generated spurious signals .49
8.15.1 Definition .49
8.15.2 Method of measurement .49
8.15.3 Limits.49
8.16 AGC efficiency .49
8.16.1 Definition .49
8.16.2 Method of measurement and limits.49
8.16.2.1 Settings.49
8.16.2.2 Increase in Signal-to-Noise Ratio (SNR) .49
8.16.2.3 Range .49
8.17 AGC time constants (attack and recovery time) .49
8.17.1 Definitions.49
8.17.2 Method of measurement .50
8.17.3 Limits.50
8.18 Protection of input circuits.50
8.18.1 Definition .50
8.18.2 Method of measurement .50
8.18.3 Limit.50
Annex A (informative): Bibliography.51
History.52
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ETS 300 373: August 1995
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ETS 300 373: August 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
The ETS sets out the minimum requirements for Medium Frequency (MF) and Medium and High
Frequency (MF/HF) equipment on board ships, operating in the maritime mobile MF and HF radio
services.
Every ETS prepared by ETSI is a voluntary standard. This ETS contains text concerning conformance
testing of the equipment to which it relates. This text should be considered only as guidance and does not
make this ETS mandatory.
Transposition dates
Date of adoption of this ETS: 26 June 1995
Date of latest announcement of this ETS (doa): 30 November 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 May 1996
Date of withdrawal of any conflicting National Standard (dow): 31 May 1996
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ETS 300 373: August 1995
Blank page
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ETS 300 373: August 1995
1 Scope
This European Telecommunication Standard (ETS) states the minimum requirements for radio
transmitters and receivers, for use on ships, operating in either the Medium Frequency (MF) only or in the
Medium and High Frequency (MF/HF) bands allocated in the International Telecommunications Union
(ITU) Radio Regulations [1], to the Maritime Mobile Service (MMS).
This ETS refers to equipment for one or more of the following:
- Single SideBand (SSB) modulation for telephony transmission and reception; (J3E)
- Frequency Shift Keying (FSK) or SSB modulation of a keyed sub-carrier to transmit and receive
Digital Selective Calling (DSC) signals in accordance with ITU-R Recommendation 493-5 [5].
This ETS also refers to radio equipment, which is not integrated with the DSC encoder or decoder, but
defines the interfaces with such equipment.
NOTE: The requirements for integrated equipment may be found in other relevant ETSs.
The tests in this ETS are applicable to receivers for operating on all frequencies in the bands 1 605 kHz to
4 000 kHz or 1 605 kHz to 27,5 MHz as allocated in the Radio Regulations [1], to the MMS.
Other spot frequency receivers should meet all the requirements of this ETS and other relevant standards
as applicable for the frequencies and modes provided.
This ETS includes the International Maritime Organisation (IMO) and ITU requirements included in the
relevant provisions of the Radio Regulations [1], the International Convention for the Safety Of Life At Sea
(SOLAS) [3], and the IMO Resolutions A.421(XI), A.610(15), A.613(15), and A.694(17) [4].
If the equipment, or parts of it, are designed in such a manner that they can be used for other categories
of maritime radiocommunication (e.g. Morse telegraphy or NBDP (ETS 300 067) [9]), those parts of the
equipment should fulfil the relevant requirements of the appropriate standards for the service(s) in
question e.g. ETS 300 067 [9].
2 Normative references
This ETS incorporates by dated or undated reference provisions from other publications. These normative
references are cited at the appropriate places in the text and the publications are listed hereafter. For
dated references, subsequent references to or revisions of any of these publications apply to this ETS
only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies.
[1] ITU Radio Regulations.
[2] CCITT Recommendation E.161 (1988): "Arrangement of figures, letters and
symbols on telephones and other devices that can be used for access to a
telephone network".
[3] International Convention for the Safety of Life at Sea, (SOLAS), as amended
1988.
[4] IMO Resolutions A.421(XI), A.610(15), A.613(15) and A.694(17).
[5] ITU-R Recommendation 493-5: "Digital Selective Calling System for use in the
Maritime Mobile Service".
[6] NMEA 0183, Version 2.00: "Standard for interfacing marine electronic devices".
[7] ISO Standard 3791: "Office machines and data processing equipment -
Keyboard layout for numeric applications".
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ETS 300 373: August 1995
[8] ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the
measurement of mobile radio equipment characteristics".
[9] ETS 300 067: "Radio Equipment and Systems (RES); Radiotelex equipment
operating in the maritime MF/HF service Technical Characteristics and methods
of measurement".
3 Definitions, abbreviations and symbols
3.1 Definitions
For the purposes of this ETS the following definitions apply:
assigned frequency: The centre of the frequency band assigned to a station.
carrier frequency: The frequency to which the transmitter or receiver is tuned.
3.2 Abbreviations
For the purposes of this ETS the following abbreviations apply:
AGC Automatic Gain Control
DSC Digital Selective Calling
EE Equipment Engineering
emf electromotive force
FSK Frequency Shift Keying
IEC International Electrotechnical Committee
IMO International Maritime Organisation
ISO International Standards Organisation
ITU International Telecommunications Union
MF Medium Frequency
MF/HF Medium and High Frequency
MMS Maritime Mobile Service
NBDP Narrow Band Direct Printing telegraphy
NMEA National Maritime Electronic Association
RMS Root Mean Square
SNR Signal-to-Noise Ratio
SOLAS Safety Of Life At Sea
SSB Single SideBand
USB Upper SideBand
3.3 Symbols
For the purposes of this ETS the following symbols apply as defined in the Radio Regulations [1]:
F1B frequency modulation, single channel containing quantized or digital information
without the use of a modulating sub-carrier, telegraphy for automatic reception.
H3E SSB, full carrier, single channel containing analogue information, telephony.
J2B SSB, suppressed carrier, single channel containing quantized or digital
information with the use of a modulating sub-carrier, telegraphy for automatic
reception.
J3E SSB, suppressed carrier, single channel containing analogue information,
telephony.
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ETS 300 373: August 1995
4 General requirements
4.1 Construction
4.1.1 Design
In all respects the mechanical and electrical design and construction and the finish of the equipment shall
conform with good engineering practice, and the equipment shall be suitable for use on board ships at
sea.
4.1.2 Inspection and maintenance
All parts of the equipment which are subject to inspection and maintenance adjustments shall be easily
accessible. Components shall be easily identifiable, either by markings within the equipment or with the
aid of the technical description.
The equipment shall be so designed that the main units can be replaced readily, without elaborate
re-calibration or re-adjustment.
4.1.3 Illumination
Equipment intended to be installed on the navigating bridge of a ship shall be provided with adequate
illumination to enable identification of controls and facilitate reading of indicators at all times. Means shall
be provided for reducing continuously, to extinction, the output of any light source on the equipment which
is capable of interfering with navigation.
4.1.4 Antenna static protection
In order to provide protection against damage due to static voltages which may appear at the input of the
receiver, there shall be a dc path from the antenna terminal to chassis not exceeding 100 k Ω.
4.1.5 Digital input panels
Where a digital input panel with the digits "0" to "9" is provided, the digits shall be arranged to conform
with CCITT Recommendation E.161 [2]. However, where an alphanumeric keyboard layout is provided,
the digits "0" to "9" may, alternatively, be arranged to conform with ISO Standard 3791 [7].
4.1.6 Audio frequencies interfaces
The following inputs and outputs applicable to the type of equipment shall be provided:
a) transmitters:
- SSB Telephony:
- 600 Ω earth free audio input;
- microphone input;
- DSC with analogue interfaces:
- 600 Ω earth free audio input;
- DSC with digital interfaces:
- NMEA 0183 Version 2.00 [6] input.
The logic level and the appropriate functions shall comply with NMEA 0183 Version 2.00 [6].
The B-state shall be logic "0", and the Y-state shall be logic "1".
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ETS 300 373: August 1995
b) receivers:
- SSB Telephony:
- 600 Ω earth free audio output;
- earphone output;
- speaker output;
- DSC with analogue interfaces:
- 600 Ω earth free audio output;
- DSC with digital interfaces:
- NMEA 0183, Version 2.00 [6] input.
The logic level and the appropriate functions shall comply with NMEA 0183 Version 2.00 [6].
The B-state shall be logic "0", and the Y-state shall be logic "1".
c) control(s):
- if a control interface is provided to
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