SIST EN 301 025-1 V1.2.1:2006
(Main)Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF radiotelephone equipment for general communications and associated equipment for Class D Digital Selective Calling (DSC); Part 1: Technical characteristics and methods of measurement
- Abstract
The present document covers the minimum requirements for general communication for shipborne fixed installations using a VHF radiotelephone with associated equipment for DSC - class D. These requirements include the relevant provisions of the ITU Radio Regulations, appendix 18 [1], ITU-R Recommendation M.493-10 [5] where class D is defined, M.825-3 [8] and incorporate the relevant guidelines of the IMO as detailed in MSC/Circ.803 [9].
The present document also specifies technical characteristics, methods of measurement and required test results.
- Status
- Published
- Publication Date
- 28-Feb-2006
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Mar-2006
- Due Date
- 01-Mar-2006
- Completion Date
- 01-Mar-2006
SIST EN 301 025-1 V1.2.1:2006 is the Slovenian adoption of ETSI EN 301 025-1 for maritime VHF radiotelephone equipment with associated Class D Digital Selective Calling (DSC). It specifies the technical characteristics, measurement methods, and required test results for shipborne fixed installations used for general communications at sea. It is written for manufacturers, test laboratories, and anyone who needs to verify voice and DSC performance on VHF maritime channels.
What does SIST EN 301 025-1 V1.2.1:2006 specify?
SIST EN 301 025-1 V1.2.1:2006 covers the minimum requirements for general communication on shipborne fixed installations using a VHF radiotelephone with associated Class D DSC equipment. The scope ties the equipment to the relevant ITU Radio Regulations, ITU-R DSC and maritime-use recommendations, and IMO guidance, then turns that into technical characteristics, measurement methods, and required test results.
The document is organized into general and operational requirements, technical requirements, measurement conditions, environmental tests, transmitter and receiver tests, DSC decoder receiver tests, and electromagnetic compatibility. The foreword places it as Part 1 of a multi-part ETSI deliverable, alongside Parts 2 and 3.
| Annex | What it covers |
|---|---|
| Annex A | DSC call formats and call types |
| Annex B | Measuring receiver specification for adjacent channel power measurement |
| Annex C | Radiated measurement sites and chamber arrangements |
| Annex D | Informative description of the equipment and intended operation |
What are the key requirements of SIST EN 301 025-1 V1.2.1:2006?
SIST EN 301 025-1 V1.2.1:2006 is mainly about how the equipment is built, how it behaves in service, and how it is tested. The clauses combine operator-facing functions, DSC handling, identity management, position input, and radio performance checks so that the equipment can be assessed as a complete maritime system.
Equipment layout and operator control
Clause 4.2 requires a transmitter, a receiver, a dedicated channel 70 watchkeeping receiver for the DSC decoder, a DSC encoder, and a DSC decoder. In practice, the product is expected to function as a complete VHF/DSC installation, not as separate unrelated units.
Clause 4.3 requires simple operation, support for all channels in ITU Radio Regulations Appendix 18, and blocking of any additional channels that are not permitted by the vessel’s licence. It also reserves channel 70 for DSC and AIS1 and AIS2 for AIS, prevents transmission while a frequency synthesizer is out of lock or during channel switching, and limits the chances of accidental misuse.
Clause 4.4 sets the mandatory controls and indicators, including DISTRESS, CALL, CANCEL, ENTER/Accept/OK, MMSI entry, on/off, push-to-talk, low-power selection, squelch, and dimming. Channel 16 must be clearly marked and must select maximum transmitter power automatically, which matters because it supports fast routine and emergency use.
DSC operation, identity, and position data
Clause 4.5 covers DSC calling functions and requires an individual call directory with at least 10 programmable entries. This gives the operator enough stored identities for routine calling without manual re-entry each time.
Clause 4.6 requires the display to show available functions, prompts, error messages, incoming and logged calls, and programmable call data before transmission. It also requires ready access to geographic position, time, and the last entered position, so the operator can confirm what will be sent in a DSC call.
Clause 5.4 requires permanent storage of the ship’s 9-digit Maritime Mobile Service Identity (MMSI), with the 10th digit added automatically as zero. No DSC call may be transmitted until the ship’s MMSI is stored, which prevents unidentified calling. The same clause allows storage of a Group MMSI for calls addressed to a group of ships.
Clause 5.5 requires manual and automatic entry of position and time information, with automatic input conforming to EN 61162-1 and recognizing GLL, GGA, RMC, and GNS. If position data are missing, the operator must be prompted for manual entry, and the prompt must repeat every 4 h. If position is still not updated after 23,5 h, it defaults to repeated 9s in line with ITU-R DSC rules.
Watchkeeping, test conditions, and performance checks
Clause 5.7 defines multiple watch behavior. During scanning, both channels must be shown, transmission must be blocked while scanning is active, and a transceiver must provide a quick way to return to the priority channel. If no separate priority channel is provided, the priority channel is channel 16.
Clause 4.10 requires the equipment to become operational within 5 s after switch-on. Clause 4.4 also limits continuous transmission time to 5 min and allows reactivation after a 10 s pause, which helps prevent prolonged carrier transmission.
Clauses 6 and 7 set the measurement environment. Tests use a 50 Ω artificial antenna where applicable, channel 16 for voice tests, and channel 70 for DSC tests. Clause 7.3 defines the performance check: transmitter output power, frequency error, voice receiver SINAD, and DSC receiver sensitivity are checked to show that the unit still operates correctly after environmental testing.
Radio performance and EMC
Clauses 8, 9, and 10 cover transmitter, radiotelephone receiver, and DSC decoder receiver performance. They include frequency error, carrier power, deviation, audio response, distortion, adjacent channel power, spurious emissions, transient behavior, sensitivity, selectivity, blocking, intermodulation, and correct decoding of DSC call types. Clause 11 sends emissions and immunity testing to EN 301 843-2.
What terms does SIST EN 301 025-1 V1.2.1:2006 define?
- Class D - A DSC class intended to provide minimum facilities for VHF distress, urgency, safety, and routine calling and reception.
- Digital Selective Calling (DSC) - A digital maritime calling system used to address individual ships, groups, or all ships and to send distress and safety calls.
- Maritime Mobile Service Identity (MMSI) - The ship identity number stored in the equipment and inserted automatically into DSC calls.
- G3E - The phase-modulated speech emission used for voice transmission, with 6 dB/octave pre-emphasis.
- G2B - The phase-modulated emission used for DSC signalling with a sub-carrier.
- Signal + Noise + Distortion to Noise + Distortion (SINAD) - The receiver quality measure used for sensitivity and audio performance checks.
- Automatic Identification System (AIS) - The shipborne identification system whose channels AIS1 and AIS2 are reserved for AIS use.
- Vessel Traffic System (VTS) - The traffic management service whose DSC channel management transmissions are addressed in the decoder tests.
Who uses SIST EN 301 025-1 V1.2.1:2006?
This standard is used by marine radio manufacturers who design VHF radiotelephones and DSC equipment for shipboard installation. It is also used by test laboratories and conformity assessment bodies that need a repeatable way to measure transmitter, receiver, DSC, environmental, and EMC performance.
Shipbuilders, installers, and integrators use it when fitting fixed VHF equipment on vessels, especially where channel access, MMSI handling, and position input must be checked. Buyers, quality managers, and approval teams use it to compare products against the same operational and test expectations before acceptance.
Which standards are used with SIST EN 301 025-1 V1.2.1:2006?
- ITU Radio Regulations, Appendix 18 - Defines the VHF maritime mobile band channel plan and transmitting frequencies.
- ITU-R Recommendation M.493-10 - Defines the maritime DSC system and the Class D concept.
- ITU-R Recommendation M.825-3 - Provides characteristics for DSC transponder use in VTS and ship-to-ship identification.
- MSC/Circ.803 - Gives IMO guidance on participation of non-SOLAS ships in GMDSS.
- EN 61162-1 - Defines the digital interface used for automatic position and time input.
- ETSI TR 100 028 - Gives guidance on measurement uncertainties for mobile radio equipment.
- ITU-R Recommendation SM 332-4 - Supports receiver selectivity and adjacent channel measurement practice.
- ITU-T Recommendation E.161 - Sets keypad digit and symbol arrangement when a numeric keypad is used.
- ITU-T Recommendation O.41 - Supports psophometric measurement practice for audio tests.
- ITU-R Recommendation M.821-1 - Covers enhanced position resolution in DSC calls.
- ITU-R Recommendation M.1371-1 - Relates to AIS, which is relevant to the reserved AIS channels.
- ETSI EN 301 843-2 - Provides the EMC emissions and immunity limits used by clause 11.
What does the SIST EN 301 025-1 V1.2.1:2006 document contain?
The document gives detailed measurement procedures for transmitter, receiver, and DSC decoder performance, including test signal definitions, calibration steps, and operating conditions. It also includes environmental test sequences such as vibration and temperature exposure, with a performance check after the equipment has been stressed.
Annex A lists the DSC call types that the equipment must handle, including distress, urgency, safety, routine, and enhanced position calls. Annex B defines the measuring receiver used for adjacent channel power measurements, including its filter behavior and detector arrangement.
Annex C describes radiated measurement sites, test antenna arrangements, substitution antenna use, and an optional anechoic chamber setup. The main clauses also include oscilloscope-based procedures for transmitter transient frequency behavior, plus methods for checking spurious emissions, receiver blocking, and correct DSC decoding.
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Frequently Asked Questions
SIST EN 301 025-1 V1.2.1:2006 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF radiotelephone equipment for general communications and associated equipment for Class D Digital Selective Calling (DSC); Part 1: Technical characteristics and methods of measurement". This standard covers: The present document covers the minimum requirements for general communication for shipborne fixed installations using a VHF radiotelephone with associated equipment for DSC - class D. These requirements include the relevant provisions of the ITU Radio Regulations, appendix 18 [1], ITU-R Recommendation M.493-10 [5] where class D is defined, M.825-3 [8] and incorporate the relevant guidelines of the IMO as detailed in MSC/Circ.803 [9]. The present document also specifies technical characteristics, methods of measurement and required test results.
The present document covers the minimum requirements for general communication for shipborne fixed installations using a VHF radiotelephone with associated equipment for DSC - class D. These requirements include the relevant provisions of the ITU Radio Regulations, appendix 18 [1], ITU-R Recommendation M.493-10 [5] where class D is defined, M.825-3 [8] and incorporate the relevant guidelines of the IMO as detailed in MSC/Circ.803 [9]. The present document also specifies technical characteristics, methods of measurement and required test results.
SIST EN 301 025-1 V1.2.1:2006 is classified under the following ICS (International Classification for Standards) categories: 33.060.99 - Other equipment for radiocommunications; 33.100.01 - Electromagnetic compatibility in general. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 025-1 V1.2.1:2006 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-marec-2006
(OHNWURPDJQHWQD]GUXåOMLYRVWLQ]DGHYHY]YH]L]UDGLMVNLPVSHNWURP (50 ±
5DGLRWHOHIRQVNDRSUHPD]DREPRþMH9+)]DVSORãQHNRPXQLNDFLMHLQSULSDGDMRþD
RSUHPD]DGLJLWDOQLVHOHNWLYQLNOLF '6& UD]UHGD'±GHO 7HKQLþQH
NDUDNWHULVWLNHLQPHULOQHPHWRGH
Electromagnetic compatibility and Radio spectrum Matters (ERM); VHF radiotelephone
equipment for general communications and associated equipment for Class D Digital
Selective Calling (DSC); Part 1: Technical characteristics and methods of measurement
Ta slovenski standard je istoveten z: EN 301 025-1 Version 1.2.1
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
ETSI EN 301 025-1 V1.2.1 (2004-09)
European Standard (Telecommunications series)
Electromagnetic compatibility
and Radio spectrum Matters (ERM);
VHF radiotelephone equipment for general communications
and associated equipment for Class "D"
Digital Selective Calling (DSC);
Part 1: Technical characteristics and
methods of measurement
2 ETSI EN 301 025-1 V1.2.1 (2004-09)
Reference
REN/ERM-TG26-057-1
Keywords
maritime, radio, traffic, VHF
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ETSI
3 ETSI EN 301 025-1 V1.2.1 (2004-09)
Contents
Intellectual Property Rights.9
Foreword.9
1 Scope.10
2 References.10
3 Definitions, symbols and abbreviations .11
3.1 Definitions.11
3.2 Symbols.11
3.3 Abbreviations.11
4 General and operational requirements.12
4.1 General.12
4.2 Composition.12
4.3 Construction.12
4.4 Controls and indicators.12
4.5 Facilities for coding and decoding of DSC .13
4.5.1 Call functions.13
4.5.2 MANUAL calls.14
4.5.3 Distress calls.14
4.5.4 ALL SHIPS calls .14
4.5.5 Incoming calls.15
4.5.6 Other calls.15
4.6 DSC display.15
4.7 Handset and loudspeaker.15
4.8 Safety precautions.15
4.9 Labelling.16
4.10 Warm up.16
5 Technical requirements.16
5.1 Switching time.16
5.2 Class of emission and modulation characteristics .16
5.3 Facilities for DSC transmission and reception .16
5.3.1 General.16
5.3.2 Decoding.17
5.3.3 Free channel transmission.17
5.3.4 Automatic acknowledgement.17
5.3.5 Automatic re-transmission of distress calls .17
5.4 Ships identity - MMSI and Group MMSI .17
5.5 Entry of position information .17
5.6 Alarm circuits.18
5.6.1 Distress and urgency.18
5.6.2 Other categories.18
5.6.3 Acoustic alarms.18
5.6.4 Cancellation of alarms .18
5.7 Multiple watch facilities.18
5.7.1 General.18
5.7.2 Scanning provisions.18
5.7.3 Scanning characteristics.19
6 General conditions of measurement.19
6.1 Arrangements for test signals applied to the receiver input.19
6.2 Squelch.19
6.3 Transmission time limitation.19
6.4 Normal test modulation.20
6.5 Artificial antenna.20
6.6 Arrangements for test signals applied to the transmitter input .20
6.7 Test channels.20
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4 ETSI EN 301 025-1 V1.2.1 (2004-09)
6.8 Generation and examination of the digital selective call signal .20
6.9 Standard test signals for DSC.20
6.10 Determination of the symbol error ratio in the output of the receiving part.21
6.11 Measurement uncertainty and interpretation of the measured results .21
6.11.1 Measurement uncertainty.21
6.11.2 Interpretation of the measurement results.21
6.12 Test conditions, power sources, and ambient temperatures.22
6.12.1 Normal and extreme test conditions.22
6.12.2 Test power source .22
6.13 Normal test conditions.22
6.13.1 Normal temperature and humidity.22
6.13.2 Normal power sources .22
6.13.2.1 Battery power source.22
6.13.2.2 Other power sources.22
6.14 Extreme test conditions .22
6.14.1 Extreme temperatures.22
6.14.2 Extreme values of test power sources.23
6.14.2.1 Battery power source.23
6.14.2.2 Other power sources.23
6.15 Procedure for tests at extreme temperatures.23
7 Environmental tests.23
7.1 Introduction.23
7.2 Procedure.23
7.3 Performance check.23
7.4 Vibration test.24
7.4.1 Definition.24
7.4.2 Method of measurement.24
7.4.3 Requirement.24
7.5 Temperature tests.24
7.5.1 Definition.24
7.5.2 Dry heat.25
7.5.2.1 Definition.25
7.5.2.2 Method of measurement.25
7.5.2.3 Requirement.25
7.5.3 Damp heat.25
7.5.3.1 Definition.25
7.5.3.2 Method of measurement.25
7.5.3.3 Requirement.25
7.5.4 Low temperature.25
7.5.4.1 Definition.25
7.5.4.2 Method of measurement.26
7.5.4.3 Requirement.26
8 Transmitter.26
8.1 Frequency error.26
8.1.1 Definition.26
8.1.2 Method of measurement.26
8.1.3 Limits.26
8.2 Carrier power.26
8.2.1 Definition.26
8.2.2 Method of measurement.26
8.2.3 Limits.27
8.2.3.1 Normal test conditions .27
8.2.3.2 Extreme test conditions .27
8.3 Frequency deviation.27
8.3.1 Definition.27
8.3.2 Maximum permissible frequency deviation.27
8.3.2.1 Method of measurement.27
8.3.2.2 Limits.27
8.3.3 Reduction of frequency deviation at modulation frequencies above 3 kHz.27
8.3.3.1 Method of measurement.27
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5 ETSI EN 301 025-1 V1.2.1 (2004-09)
8.3.3.2 Limits.28
8.4 Sensitivity of the modulator, including microphone .28
8.4.1 Definition.28
8.4.2 Method of measurement.28
8.4.3 Limits.28
8.5 Audio frequency response .28
8.5.1 Definition.28
8.5.2 Method of measurement.29
8.5.3 Limit.29
8.6 Audio frequency harmonic distortion of the emission.29
8.6.1 Definition.29
8.6.2 Method of measurement.30
8.6.2.1 Normal test conditions .30
8.6.2.2 Extreme test conditions .30
8.6.3 Limits.30
8.7 Adjacent channel power .30
8.7.1 Definition.30
8.7.2 Method of measurement.30
8.7.3 Limits.31
8.8 Conducted spurious emissions conveyed to the antenna .31
8.8.1 Definition.31
8.8.2 Method of measurement.31
8.8.3 Limit.31
8.9 Cabinet radiation and conducted spurious emissions other than those conveyed to the antenna .31
8.9.1 Definitions.31
8.9.2 Method of measurement.31
8.9.3 Limits.32
8.10 Transient frequency behaviour of the transmitter.32
8.10.1 Definitions.32
8.10.2 Method of measurement.33
8.10.3 Limits.35
8.11 Residual modulation of the transmitter .35
8.11.1 Definition.35
8.11.2 Method of measurement.35
8.11.3 Limit.35
8.12 Frequency error (demodulated DSC signal).35
8.12.1 Definition.35
8.12.2 Method of measurement.36
8.12.3 Limits.36
8.13 Modulation index for DSC .36
8.13.1 Definition.36
8.13.2 Method of measurement.36
8.13.3 Limits.36
8.14 Modulation rate for DSC.36
8.14.1 Definition.36
8.14.2 Method of measurement.36
8.14.3 Limits.36
8.15 Testing of generated call sequences .37
8.15.1 Definition.37
8.15.2 Method of measurement.37
8.15.3 Requirement.37
8.16 Testing of free channel transmission on DSC channel 70 .37
8.16.1 Definition.37
8.16.2 Method of measurement.37
8.16.3 Requirement.37
9 Radiotelephone receiver.38
9.1 Harmonic distortion and rated audio-frequency output power.38
9.1.1 Definition.38
9.1.2 Methods of measurement.38
9.1.3 Limits.38
9.2 Audio frequency response .38
ETSI
6 ETSI EN 301 025-1 V1.2.1 (2004-09)
9.2.1 Definition.38
9.2.2 Method of measurement.38
9.2.3 Limits.39
9.3 Maximum usable sensitivity.39
9.3.1 Definition.39
9.3.2 Method of measurement.39
9.3.3 Limits.40
9.4 Co-channel rejection.40
9.4.1 Definition.40
9.4.2 Method of measurement.40
9.4.3 Limit.40
9.5 Adjacent channel selectivity.40
9.5.1 Definition.40
9.5.2 Method of measurement.40
9.5.3 Limits.41
9.6 Spurious response rejection.41
9.6.1 Definition.41
9.6.2 Method of measurement.41
9.6.3 Limit.41
9.7 Intermodulation response.41
9.7.1 Definition.41
9.7.2 Method of measurement.42
9.7.3 Limit.42
9.8 Blocking or desensitization .42
9.8.1 Definition.42
9.8.2 Method of measurement.42
9.8.3 Limit.42
9.9 Spurious emissions.43
9.9.1 Definition.43
9.9.2 Method of measuring the power level .43
9.9.3 Limit.43
9.10 Receiver radiated spurious emissions.43
9.10.1 Definition.43
9.10.2 Method of measurements.43
9.10.3 Limit.44
9.11 Receiver residual noise level .44
9.11.1 Definition.44
9.11.2 Method of measurement.44
9.11.3 Limit.44
9.12 Squelch operation.44
9.12.1 Definition.44
9.12.2 Method of measurement.45
9.12.3 Limits.45
9.13 Squelch hysteresis.45
9.13.1 Definition.45
9.13.2 Method of measurement.45
9.13.3 Limit.45
9.14 Multiple watch characteristic.46
9.14.1 Definition.46
9.14.2 Method of measurement.46
9.14.3 Limits.46
10 Receiver for DSC decoder.46
10.1 Maximum usable sensitivity.46
10.1.1 Definition.46
10.1.2 Method of measurement.46
10.1.3 Limits.47
10.2 Co-channel rejection.47
10.2.1 Definition.47
10.2.2 Method of measurement.47
10.2.3 Limits.47
10.3 Adjacent channel selectivity.47
ETSI
7 ETSI EN 301 025-1 V1.2.1 (2004-09)
10.3.1 Definition.47
10.3.2 Method of measurement.47
10.3.3 Limits.48
10.4 Spurious response and blocking immunity.48
10.4.1 Definition.48
10.4.2 Method of measurement.48
10.4.3 Limits.48
10.5 Intermodulation response.48
10.5.1 Definition.48
10.5.2 Method of measurement.48
10.5.3 Limits.49
10.6 Dynamic range.49
10.6.1 Definition.49
10.6.2 Method of measurement.49
10.6.3 Limit.49
10.7 Spurious emissions.49
10.7.1 Definition.49
10.7.2 Method of measuring the power level .49
10.7
...