SIST EN 301 025:2000
(Main)ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Technical characteristics and methods of measurement for VHF radiotelephone equipment for general communications and associated equipment for Class D Digital Selective Calling (DSC)
- Abstract
EN for equipment to be used in the maritime services and not forming part of the Global Maritime Distress and Safety System (GMDSS).
- Status
- Published
- Publication Date
- 30-Nov-2000
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2000
- Due Date
- 01-Dec-2000
- Completion Date
- 01-Dec-2000
SIST EN 301 025:2000 is a European Standard from ETSI, adopted by SIST, for VHF radiotelephone equipment for general maritime communications with associated Class D Digital Selective Calling (DSC). It specifies the equipment characteristics, operating functions and measurement methods for shipborne fixed installations used in maritime services that do not form part of the Global Maritime Distress and Safety System (GMDSS).
What does SIST EN 301 025:2000 specify?
SIST EN 301 025:2000 sets the minimum technical and operational requirements for VHF radiotelephone equipment with Class D DSC, together with the methods used to verify them. It is written for shipborne fixed installations, so it is the document to use when checking product design, test plans and acceptance criteria for this type of maritime radio.
The document is organized into clauses 1 to 10, followed by five annexes.
| Annex | What it covers |
|---|---|
| Annex A | DSC calls |
| Annex B | Measuring receiver for adjacent channel power measurement |
| Annex C | Radiated measurements |
| Annex D | Description of the equipment |
| Annex E | Subclauses relevant for compliance with EC Council Directives |
What are the key requirements of SIST EN 301 025:2000?
SIST EN 301 025:2000 requires the equipment to include a VHF radiotelephone, a radiotelephone receiver, a dedicated channel 70 watchkeeping receiver for the DSC decoder, a DSC encoder and a DSC decoder. In practice, this means the radio is not just a voice set - it must also support the DSC functions needed for maritime calling and call handling.
Operational controls and DSC handling
Clause 4 requires a dedicated distress button, protected against accidental use, with at least two independent actions before a distress alert is sent. The distress sequence must have priority over other functions, switch to channel 70, transmit the distress call five times, and then retune to channel 16 at maximum power. For an operator, this means distress calling must be quick, but also guarded against unintended activation.
The standard also requires clear controls, readable channel indication, a distinct marking for channel 16, and a way to prevent use of channel 70 for anything other than DSC. Incoming DSC calls must be shown in plain language, and the last 10 received DSC calls must be stored until they are read. If the equipment has multiple watch facilities, DSC operation always takes precedence and channel 70 must not be scanned.
Transmitter and receiver performance
Clause 5 specifies the radio characteristics. The equipment uses phase modulation, with G3E for speech and G2B for DSC, and it is designed for 25 kHz channel separation. Key transmitter limits include frequency error within ±1.5 kHz, carrier power between 6 W and 25 W at high power, and maximum frequency deviation of ±5 kHz. These limits matter because they control channel occupancy, coverage and compatibility with other maritime radios.
Receiver requirements cover audio output, sensitivity, selectivity and rejection of unwanted signals. For example, the maximum usable sensitivity is checked with a Signal + Noise + Distortion to Noise + Distortion (SINAD) ratio of 20 dB, and the audio output power must be sufficient for both loudspeaker and handset use. This ensures the radio remains intelligible in normal marine listening conditions.
Messaging, identity and position information
Clause 5 also requires permanent storage of the ship’s Maritime Mobile Service Identity (MMSI), automatic insertion of the identity in DSC calls, and support for Group MMSI programming. Position information can be entered manually or automatically, with automatic input required to conform with IEC 1162-1. If position data are not refreshed, the document defines fallback behavior for the stored position. For users, this means the radio must be able to identify the vessel correctly and include valid position data in distress-related use.
Testing and environmental robustness
Clauses 6 and 7 define the test conditions, including normal and extreme temperature and supply-voltage conditions, measurement uncertainty, vibration, dry heat, damp heat and low temperature tests. The equipment must continue to meet the performance check after these environmental exposures. In practice, these clauses are what a test lab uses to show the radio remains usable in marine service.
What terms does SIST EN 301 025:2000 define?
- Class D - equipment intended to provide minimum VHF DSC distress, urgency, safety, routine calling and reception functions.
- Carrier frequency - the frequency to which the transmitter or receiver is tuned.
- Frequency deviation - the difference between the instantaneous modulated RF frequency and the carrier frequency.
- G3E - phase modulation for speech with 6 dB per octave pre-emphasis.
- G2B - phase modulation with digital information and a sub-carrier for DSC operation.
- MMSI - Maritime Mobile Service Identity, the ship identity stored and inserted into DSC calls.
- SINAD - Signal + Noise + Distortion to Noise + Distortion, used to judge receiver sensitivity and rejection.
- DSC - Digital Selective Calling, the digital calling system used on channel 70.
Who uses SIST EN 301 025:2000?
Manufacturers use SIST EN 301 025:2000 to design and declare compliance for VHF maritime radios with Class D DSC. Test laboratories use it to set up measurements and decide pass or fail. Quality and compliance teams use it to check that controls, alarms, channel handling and identity functions match maritime service needs. Buyers, ship operators and integrators use it when selecting equipment for shipborne fixed installations that are outside GMDSS carriage requirements.
Which standards are used with SIST EN 301 025:2000?
| Reference | What it contributes |
|---|---|
| ITU Radio Regulations, Appendix 18 | Channel list for the maritime mobile service in the VHF band |
| ITU-T Recommendation E.161 | Keypad digit, letter and symbol arrangement |
| ITU-T Recommendation P.53 | Psophometric filtering for receiver measurements |
| IEC 1162-1 | Digital interfaces for automatic position and time input |
| ITU-R Recommendation M.493-9 | DSC system rules, message format and Class D definition |
| ETR 028 | Measurement uncertainty method |
| ITU-R Recommendation SM 332-4 | Receiver selectivity basis for adjacent channel power measurement |
| ITU-R Recommendation M.825-1 | Automatic identification behavior |
| MSC/Circ.803 | Non-SOLAS ship participation in GMDSS |
What does the SIST EN 301 025:2000 document contain?
SIST EN 301 025:2000 contains detailed test methods for transmitter characteristics, receiver characteristics and DSC decoder performance, including channel switching time, frequency error, power, deviation, adjacent channel power, spurious emissions and transient behavior. It also includes procedures for DSC call generation, decoding verification and message sequence checking.
The document uses defined test arrangements such as artificial antennas, combining networks, calibrated DSC generators and radiated measurement sites. It also includes figures and templates for frequency deviation, audio response and transient frequency behavior, so the reader can reproduce the same test setup in a laboratory.
Annex C is especially practical for compliance testing because it sets out radiated measurement sites and the use of substitution antennas. Annex E links the technical clauses to EC Directive compliance, which is useful for conformity assessment and technical documentation.
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Frequently Asked Questions
SIST EN 301 025:2000 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "ElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Technical characteristics and methods of measurement for VHF radiotelephone equipment for general communications and associated equipment for Class D Digital Selective Calling (DSC)". This standard covers: EN for equipment to be used in the maritime services and not forming part of the Global Maritime Distress and Safety System (GMDSS).
EN for equipment to be used in the maritime services and not forming part of the Global Maritime Distress and Safety System (GMDSS).
SIST EN 301 025:2000 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 301 025:2000 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)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NRPXQLNDFLMVNRNOLFDElectroMagnetic Compatibility and Radio Spectrum Matters (ERM); Technical characteristics and methods of measurement for VHF radiotelephone equipment for general communications and associated equipment for Class D Digital Selective Calling (DSC)33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.99Druga oprema za radijske komunikacijeOther equipment for radiocommunicationsICS:Ta slovenski standard je istoveten z:EN 301 025 Version 1.1.1SIST EN 301 025:2000en01-december-2000SIST EN 301 025:2000SLOVENSKI
STANDARD
EN 301 025 V1.1.1 (1998-08)European Standard (Telecommunications series)Electromagnetic compatibilityand Radio spectrum Matters (ERM);Technical characteristics and methods of measurement forVHF radiotelephone equipment for general communicationsand associated equipment for Class "D"Digital Selective Calling (DSC)SIST EN 301 025:2000
ETSIEN 301 025 V1.1.1 (1998-08)2ReferenceDEN/ERM-RP01-019 (9ho00ico.PDF)KeywordsMaritime, radio, trafficETSIPostal addressF-06921 Sophia Antipolis Cedex - FRANCEOffice address650 Route des Lucioles - Sophia AntipolisValbonne - FRANCETel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16Siret N° 348 623 562 00017 - NAF 742 CAssociation à but non lucratif enregistrée à laSous-Préfecture de Grasse (06) N° 7803/88Internetsecretariat@etsi.frhttp://www.etsi.frhttp://www.etsi.orgCopyright NotificationNo 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 1998.All rights reserved.SIST EN 301 025:2000
ETSIEN 301 025 V1.1.1 (1998-08)3ContentsIntellectual Property Rights.9Foreword.91Scope.102References.103Definitions and abbreviations.113.1Definitions.113.2Abbreviations.114General and operational requirements.114.1General.114.2Composition.114.3Construction.124.4Controls and indicators.124.5Facilities for coding and decoding of DSC.134.5.1Call functions.134.5.2MANUAL calls.134.5.3Distress calls.134.5.4ALL SHIPS calls.144.5.5Incoming calls.144.6DSC display.144.7Handset and loudspeaker.144.8Safety precautions.144.9Labelling.154.10Warm up.155Technical requirements.155.1Switching time.155.2Class of emission and modulation characteristics.155.3Facilities for DSC transmission and reception.155.3.1General.155.3.2Decoding.165.3.3Free channel transmission.165.3.4Automatic acknowledgement.165.3.5Automatic re-transmission of distress calls.165.4Ships identity - MMSI and Group MMSI.165.5Entry of position information.165.6Alarm circuits.175.6.1Distress and urgency.175.6.2Other categories.175.6.3Acoustic alarms.175.6.4Cancellation of alarms.175.7Facilities for automatic identification.175.8Multiple watch facilities.175.8.1General.175.8.2Scanning provisions.175.8.3Scanning characteristics.186General conditions of measurement.186.1Arrangements for test signals applied to the receiver input.186.2Squelch.186.3Normal test modulation.186.4Artificial antenna.196.5Arrangements for test signals applied to the transmitter input.196.6Test channels.19SIST EN 301 025:2000
ETSIEN 301 025 V1.1.1 (1998-08)46.7Generation and examination of the digital selective call signal.196.8Standard test signals for DSC.196.9Determination of the symbol error ratio in the output of the receiving part.196.10Measurement uncertainty and interpretation of the measured results.206.10.1Measurement uncertainty.206.10.2Interpretation of the measurement results.206.11Test conditions, power sources, and ambient temperatures.206.11.1Normal and extreme test conditions.206.11.2Test power source.206.12Normal test conditions.216.12.1Normal temperature and humidity.216.12.2Normal power sources.216.12.2.1Battery power source.216.12.2.2Other power sources.216.13Extreme test conditions.216.13.1Extreme temperatures.216.13.2Extreme values of test power sources.216.13.2.1Battery power source.216.13.2.2Other power sources.216.14Procedure for tests at extreme temperatures.217Environmental tests.227.1Introduction.227.2Procedure.227.3Performance check.227.4Vibration test.227.4.1Definition.227.4.2Method of measurement.227.4.3Requirement.237.5Temperature tests.237.5.1Definition.237.5.2Dry heat.237.5.2.1Definition.237.5.2.2Method of measurement.237.5.2.3Requirement.237.5.3Damp heat.237.5.3.1Definition.237.5.3.2Method of measurement.237.5.3.3Requirement.247.5.4Low temperature.247.5.4.1Definition.247.5.4.2Method of measurement.247.5.4.3Requirement.248Transmitter.248.1Frequency error.248.1.1Definition.248.1.2Method of measurement.248.1.3Limits.258.2Carrier power.258.2.1Definition.258.2.2Method of measurement.258.2.3Limits.258.2.3.1Normal test conditions.258.2.3.2Extreme test conditions.258.3Frequency deviation.258.3.1Definition.258.3.2Maximum permissible frequency deviation.258.3.2.1Method of measurement.258.3.2.2Limits.268.3.3Reduction of frequency deviation at modulation frequencies above 3 kHz.26SIST EN 301 025:2000
ETSIEN 301 025 V1.1.1 (1998-08)58.3.3.1Method of measurement.268.3.3.2Limits.268.4Sensitivity of the modulator, including microphone.268.4.1Definition.268.4.2Method of measurement.278.4.3Limits.278.5Audio frequency response.278.5.1Definition.278.5.2Method of measurement.278.5.3Limit.278.6Audio frequency harmonic distortion of the emission.288.6.1Definition.288.6.2Method of measurement.288.6.2.1Normal test conditions.298.6.2.2Extreme test conditions.298.6.3Limits.298.7Adjacent channel power.298.7.1Definition.298.7.2Method of measurement.298.7.3Limits.298.8Conducted spurious emissions conveyed to the antenna.308.8.1Definition.308.8.2Method of measurement.308.8.3Limit.308.9Cabinet radiation and conducted spurious emissions other than those conveyed to the antenna.308.9.1Definitions.308.9.2Method of measurement.308.9.3Limits.318.10Transient frequency behaviour of the transmitter.318.10.1Definitions.318.10.2Method of measurement.328.10.3Limits.348.11Residual modulation of the transmitter.348.11.1Definition.348.11.2Method of measurement.348.11.3Limit.348.12Frequency error (demodulated DSC signal).348.12.1Definition.348.12.2Method of measurement.358.12.3Limits.358.13Modulation index for DSC.358.13.1Definition.358.13.2Method of measurement.358.13.3Limits.358.14Modulation rate for DSC.358.14.1Definition.358.14.2Method of measurement.358.14.3Limits.358.15Testing of generated call sequences.368.15.1Definition.368.15.2Method of measurement.368.15.3Requirement.369Radiotelephone receiver.369.1Harmonic distortion and rated audio-frequency output power.369.1.1Definition.369.1.2Methods of measurement.369.1.3Limits.379.2Audio frequency response.379.2.1Definition.379.2.2Method of measurement.37SIST EN 301 025:2000
ETSIEN 301 025 V1.1.1 (1998-08)69.2.3Limits.379.3Maximum usable sensitivity.389.3.1Definition.389.3.2Method of measurement.389.3.3Limits.399.4Co-channel rejection.399.4.1Definition.399.4.2Method of measurement.399.4.3Limit.399.5Adjacent channel selectivity.399.5.1Definition.399.5.2Method of measurement.399.5.3Limits.409.6Spurious response rejection.409.6.1Definition.409.6.2Method of measurement.409.6.3Limit.409.7Intermodulation response.409.7.1Definition.409.7.2Method of measurement.419.7.3Limit.419.8Blocking or desensitization.419.8.1Definition.419.8.2Method of measurement.419.8.3Limit.419.9Spurious emissions.419.9.1Definition.419.9.2Method of measuring the power level.429.9.3Limit.429.10Radiated spurious emissions.429.10.1Definition.429.10.2Method of measurements.429.10.3Limit.439.11Receiver residual noise level.439.11.1Definition.439.11.2Method of measurement.439.11.3Limit.439.12Squelch operation.439.12.1Definition.439.12.2Method of measurement.439.12.3Limits.449.13Squelch hysteresis.449.13.1Definition.449.13.2Method of measurement.449.13.3Limit.449.14Multiple watch characteristic.449.14.1Definition.449.14.2Method of measurement.459.14.3Limits.4510Receiver for DSC decoder.4510.1Maximum usable sensitivity.4510.1.1Definition.4510.1.2Method of measurement.4510.1.3Limits.4510.2Co-channel rejection.4610.2.1Definition.4610.2.2Method of measurement.4610.2.3Limits.4610.3Adjacent channel selectivity.4610.3.1Definition.46SIST EN 301 025:2000
ETSIEN 301 025 V1.1.1 (1998-08)710.3.2Method of measurement.4610.3.3Limits.4610.4Spurious response and blocking immunity.4710.4.1Definition.4710.4.2Method of measurement.4710.4.3Limits.4710.5Intermodulation response.4710.5.1Definition.4710.5.2Method of measurement.4710.5.3Limits.4710.6Dynamic range.4810.6.1Definition.4810.6.2Method of measurement.4810.6.3Limit.4810.7Spurious emissions.4810.7.1Definition.4810.7.2Method of measuring the power level.4810.7.3Limit.4810.8Radiated spurious emissions.4810.8.1Definition.4810.8.2Method of measurements.4810.8.3Limit.4910.9Verification of correct decoding of various types of DSC calls.4910.9.1Definition.4910.9.2Method of measurement.4910.9.3Requirement.50Annex A (normative):DSC Calls.51Annex B (normative):Measuring receiver for adjacent channel power measurement.52B.1Power measuring receiver specification.52B.1.1IF filter.52B.1.2Attenuation indicator.53B.1.3R.M.S. value indicator.53B.1.4Oscillator and amplifier.53Annex C (normative):Radiated measurements.54C.1Test sites and general arrangements for measurements involving the use of radiated fields.54C.1.1Outdoor test site.54C.1.2Test antenna.54C.1.3Substitution antenna.55C.1.4Optional additional indoor site.55C.2Guidance on the use of radiation test sites.56C.2.1Measuring distance.56C.2.2Test antenna.56C.2.3Substitution antenna.
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