SIST EN 301 925 V1.1.1:2003
(Main)Electromagnetic compatibility and Radio spectrum Matters (ERM); Radiotelephone transmitters and receivers for the maritime mobile service operating in VHF bands; Technical characteristics and methods of measurement
- Abstract
To address intermodulation test issues and consider of EMC and DSC requuirements
- Status
- Published
- Publication Date
- 30-Nov-2003
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Dec-2003
- Due Date
- 01-Dec-2003
- Completion Date
- 01-Dec-2003
SIST EN 301 925 V1.1.1:2003 is the Slovenian standard aligned with ETSI EN 301 925 V1.1.1. It specifies technical characteristics and methods of measurement for shipborne radiotelephone transmitters and receivers operating in the VHF maritime mobile bands, including radiotelephony and Digital Selective Calling (DSC) within the Global Maritime Distress and Safety System (GMDSS). It is written for equipment intended for ships and for the people who design, test, approve, or buy that equipment.
What does SIST EN 301 925 V1.1.1:2003 specify?
SIST EN 301 925 V1.1.1:2003 sets minimum requirements for shipborne radio transmitters and receivers in the 156 MHz to 174 MHz maritime VHF range. It covers both technical performance and the methods used to measure that performance, with a strong focus on EMC behavior in marine environments.
The scope links the standard to SOLAS ships and the European Marine Equipment Directive, and it gives priority to its EMC requirements if they conflict with EN 60945. It also excludes stand-alone testing of ancillary equipment that is only used together with the radio equipment.
The document is organized into clauses on scope, references, definitions, general and technical requirements, test conditions, measurement conditions, performance checks, environmental tests, emissions, immunity, cabinet radiation, transmitter requirements, and receiver requirements.
| Annex | What it covers |
|---|---|
| Annex B | Frequency Set Information (FSI) |
| Annex C | Test site and substitution antenna method for cabinet radiation measurements |
What are the key requirements of SIST EN 301 925 V1.1.1:2003?
The standard requires the equipment to behave as shipboard radio equipment in normal use, and to stay usable after the specified environmental and EMC tests. In practice, that means the design, controls, interfaces, and test results all have to match the maritime operating environment.
Operating and interface requirements
Clause 4 requires the equipment to support simplex and semi-duplex operation, to use the channel plan from ITU Radio Regulations Appendix S18, and to prevent user blocking of channels. Channel 70 must be reserved for DSC, and channel 16 must be clearly identified and easy to select.
Clause 5 sets operating behavior such as channel switching time, transmit-receive changeover time, the G3E speech mode and G2B DSC mode, and the 25 kHz channel spacing assumption. It also covers multiple watch facilities, DSC controller interfaces, and the VDR audio output port. For a manufacturer, this means the radio must integrate cleanly with DSC control and voyage data recording functions.
Safety, labelling, and usability
Clause 4 also requires protection against overcurrent, overvoltage, reverse polarity, and unsafe access to higher-voltage parts. It calls for clear labeling, visible power and status indications, and a warm-up time of no more than 5 s.
The equipment must tolerate an open-circuit or short-circuit antenna port for at least five minutes, provide a DC path from the antenna terminals to chassis, and protect volatile memory against repeated short power interruptions. These points matter because they cover real shipboard faults, maintenance situations, and power quality issues.
Test conditions and EMC verification
Clauses 6 and 7 define normal and extreme test conditions, the test power source, channel selection for tests, receiver squelch settings, modulation conditions, and the way results are interpreted. The measurement uncertainty for each parameter must be recorded in the test report and kept within the values given in table 1.
Clauses 8 to 11 define performance checks, environmental tests, emissions tests, and immunity tests. Key performance checks include transmitter frequency error, carrier power, audio frequency harmonic distortion, and receiver sensitivity. The EMC tests cover ESD, RF fields, fast transients, conducted disturbances, power supply variations, power failures, and surge.
Transmitter and receiver limits
Clauses 12 to 14 set limits and methods for spurious emissions, cabinet radiation, transmitter frequency error, carrier power, frequency deviation, modulator behavior, DSC audio input characteristics, and receiver audio performance. For users and test labs, these clauses are the main pass-fail criteria for type testing and conformity assessment.
What terms does SIST EN 301 925 V1.1.1:2003 define?
- Ancillary equipment - Equipment used with the radio to add control or operating features, but not needed for the radio’s basic transmit or receive function.
- Continuous phenomena - EMC disturbances that do not appear as separate, countable events.
- Digital Selective Calling (DSC) - A digital calling method used in maritime mobile service for distress, safety, and routine calls.
- Equipment Under Test (EUT) - The specific radio equipment being measured or subjected to EMC testing.
- Global Maritime Distress and Safety System (GMDSS) - The maritime communications system used for distress and safety communications.
- Very High Frequency (VHF) - The radio band used here for shipborne maritime communications.
- Voyage Data Recorder (VDR) - Ship equipment that records voyage-related data and uses the audio output interface described in the standard.
Who uses SIST EN 301 925 V1.1.1:2003?
This standard is used by manufacturers of maritime VHF radiotelephones, test laboratories, and conformity assessment bodies. It is also used by marine equipment approvers, ship integrators, and quality managers who need to verify channel behavior, DSC operation, EMC performance, and interface compatibility.
In practice, they use it for design verification, type testing, EMC testing, and documenting whether equipment is suitable for shipboard installation.
Which standards are used with SIST EN 301 925 V1.1.1:2003?
The standard relies on a wide set of external references for regulatory context, radio channel planning, DSC behavior, interfaces, and EMC methods. The most important ones are:
- IMO SOLAS 1974 and Council Directive 96/98/EC - set the ship and marine equipment context.
- IMO Resolution A.803(19) and IMO Resolution A.524(13) - define shipborne VHF performance and multiple watch expectations.
- ITU Radio Regulations and Appendix S18 - define the maritime VHF channel plan and transmitting frequencies.
- ITU-R M.489-2, ITU-R M.493-10, and ITU-R M.541-8 - cover speech characteristics, DSC, and DSC operating procedures.
- EN 300 338 and EN 61162-1 - cover DSC controller functions and the operational interface.
- EN 60945, CISPR 16-1, and the IEC 61000-4 series - provide EMC test methods and related measurement practice.
- ETSI ETR 028 and IEC 60050-161 - support uncertainty treatment and EMC terminology.
What does the SIST EN 301 925 V1.1.1:2003 document contain?
The document contains measurement methods, test setups, and pass-fail criteria for maritime VHF radiotelephone equipment. It includes procedures for performance checks, vibration and temperature testing, emissions testing, immunity testing, and detailed transmitter and receiver measurements.
It also includes tabulated limits and measurement uncertainties: table 1 for uncertainty values, table 2 and table 3 for spurious-emission limits, and figure 2 for conducted emissions into the mains. Annex C provides the substitution-antenna method used for cabinet radiation measurements, which is the practical method for determining radiated spurious output from the enclosure.
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Frequently Asked Questions
SIST EN 301 925 V1.1.1:2003 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Electromagnetic compatibility and Radio spectrum Matters (ERM); Radiotelephone transmitters and receivers for the maritime mobile service operating in VHF bands; Technical characteristics and methods of measurement". This standard covers: To address intermodulation test issues and consider of EMC and DSC requuirements
To address intermodulation test issues and consider of EMC and DSC requuirements
SIST EN 301 925 V1.1.1:2003 is classified under the following ICS (International Classification for Standards) categories: 33.060.20 - Receiving and transmitting equipment; 33.100.01 - Electromagnetic compatibility in general; 47.020.70 - Navigation and control equipment. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST EN 301 925 V1.1.1:2003 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.RGHElectromagnetic compatibility and Radio spectrum Matters (ERM); Radiotelephone transmitters and receivers for the maritime mobile service operating in VHF bands; Technical characteristics and methods of measurement47.020.70Navigacijska in krmilna opremaNavigation and control equipment33.100.01Elektromagnetna združljivost na splošnoElectromagnetic compatibility in general33.060.20Sprejemna in oddajna opremaReceiving and transmitting equipmentICS:Ta slovenski standard je istoveten z:EN 301 925 Version 1.1.1SIST EN 301 925 V1.1.1:2003en01-december-2003SIST EN 301 925 V1.1.1:2003SLOVENSKI
STANDARD
ETSI ETSI EN 301 925 V1.1.1 (2002-09) 2
Reference DEN/ERM-RP01-024 Keywords EMC, GMDSS, maritime, radio, telephony, VHF ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE
Tel.: +33 4 92 94 42 00
Fax: +33 4 93 65 47 16
Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88
Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ETSI documents is available at http://portal.etsi.org/tb/status/status.asp If you find errors in the present document, send your comment to: editor@etsi.fr 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 2002. All rights reserved.
DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the benefit of its Members. TIPHONTM and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. SIST EN 301 925 V1.1.1:2003
ETSI ETSI EN 301 925 V1.1.1 (2002-09) 3
Contents Intellectual Property Rights.9 Foreword.9 1 Scope.10 2 References.10 3 Definitions, symbols and abbreviations.12 3.1 Definitions.12 3.2 Symbols.13 3.3 Abbreviations.13 4 General requirements.14 4.1 Construction.14 4.2 Controls and indicators.14 4.3 Handset and loudspeaker.15 4.4 Safety precautions.15 4.5 Labelling.16 4.6 Warm up.16 5 Technical requirements.16 5.1 Switching time.16 5.2 Class of emission and modulation characteristics.16 5.3 Multiple watch facilities.16 5.3.1 Additional performance standards.16 5.3.2 Scanning characteristics.17 5.4 DSC controller interfaces.17 5.4.1 Interface requirements.17 5.4.2 Signal interfaces.17 5.4.3 Operational interfaces.17 5.5 Voyage data recorder interface.18 6 Test conditions, power sources and ambient temperatures.18 6.1 Test conditions.18 6.2 Test power source.18 6.3 Normal test conditions.18 6.3.1 Normal temperature and humidity.18 6.3.2 Normal power source voltage.18 6.3.2.1 Mains powered equipment.18 6.3.2.2 Battery powered equipment.18 6.3.2.3 Other power sources.19 6.4 Extreme test conditions.19 6.4.1 Extreme temperatures.19 6.4.2 Extreme values of power source voltage.19 6.4.2.1 Mains powered equipment.19 6.4.2.2 Battery powered equipment.19 6.4.2.3 Other power sources.19 6.5 Procedure for tests at extreme temperatures.19 7 General conditions of measurement.19 7.1 Sequence of testing.19 7.2 Test channels.20 7.3 Squelch.20 7.4 Arrangements for test signals applied to the receiver input.20 7.5 Normal test modulation of the receiver wanted signal.20 7.6 Arrangements for monitoring the receiver output.20 7.7 Arrangements for test signals applied to the transmitter input.20 7.8 Normal test modulation of the transmitter.21 7.9 Arrangements for monitoring the transmitter output.21 SIST EN 301 925 V1.1.1:2003
ETSI ETSI EN 301 925 V1.1.1 (2002-09) 4
7.10 DSC encoder/decoder.21 7.11 Standard test signals for DSC.21 7.12 Determination of symbol error ratio in the output of the receiver.21 7.13 Interpretation of the measurement results.21 8 Performance checks.22 8.1 Performance checks - introduction.22 8.2 Performance check - transmitter frequency error.22 8.3 Performance check - transmitter carrier power.22 8.4 Performance check - transmitter audio frequency harmonic distortion of the emission.23 8.5 Performance check - receiver sensitivity.23 9 Environmental tests.23 9.1 Procedure.23 9.2 Vibration test.23 9.2.1 Definition.23 9.2.2 Method of measurement.23 9.2.3 Requirement.24 9.3 Temperature tests.24 9.3.1 Introduction.24 9.3.2 General Procedure.24 9.3.3 Dry heat.24 9.3.3.1 Definition.24 9.3.3.2 Method of measurement.24 9.3.3.3 Requirement.24 9.3.4 Damp heat.25 9.3.4.1 Definition.25 9.3.4.2 Method of measurement.25 9.3.4.3 Requirement.25 9.3.5 Low temperature cycle.25 9.3.5.1 Definition.25 9.3.5.2 Method of measurement.25 9.3.5.3 Requirement.25 10 Emissions tests.26 10.1 General conditions for emissions tests.26 10.2 Conducted emissions from power ports.26 10.2.1 Definition.26 10.2.2 Test method.26 10.2.3 Limits.27 10.3 Radiated emissions from the enclosure port.27 11 Immunity tests.28 11.1 General conditions for immunity tests.28 11.1.1 Introduction.28 11.1.2 Performance assessment.28 11.1.3 Ancillary equipment.28 11.1.4 Test configuration.28 11.1.5 Arrangements for test signals.29 11.1.5.1 General arrangements.29 11.1.5.2 Arrangements for test signals applied to the transmitter input.29 11.1.5.3 Arrangements for monitoring the transmitter output.29 11.1.5.4 Arrangements for test signals applied to the receiver input.29 11.1.5.5 Arrangements for monitoring the receiver output.29 11.1.6 Exclusion bands.30 11.1.6.1 Definition.30 11.1.6.2 Transmitter exclusion band for immunity tests.30 11.1.6.3 Receiver exclusion band for immunity tests.30 11.1.7 Assessment of receiver responses.30 11.2 Performance criteria.30 11.2.1 Categories.30 11.2.2 Performance criteria A for continuous phenomena.31 11.2.3 Performance criteria B for transient phenomena.31 SIST EN 301 925 V1.1.1:2003
ETSI ETSI EN 301 925 V1.1.1 (2002-09) 5
11.2.4 Performance criteria C for power supply failure.31 11.2.5 Immunity performance check.31 11.3 Electrostatic discharge immunity (ESD).31 11.3.1 Definition.31 11.3.2 Test method.32 11.3.3 Performance criteria.32 11.4 RF electromagnetic fields in the frequency range 80 MHz to 2 GHz.32 11.4.1 Definition.32 11.4.2 Test method.32 11.4.3 Performance criteria.33 11.5 Fast transient, common mode.33 11.5.1 Definition.33 11.5.2 Test method.33 11.5.3 Performance criteria.33 11.6 Conducted disturbances on power ports (RF common mode).33 11.6.1 Definition.33 11.6.2 Test method.34 11.6.3 Performance criteria.35 11.7 Power supply short term variations.35 11.7.1 Definition.35 11.7.2 Test method.35 11.7.3 Performance criteria.35 11.8 Power supply failure.35 11.8.1 Definition.35 11.8.2 Test method.36 11.8.3 Performance criteria.36 11.9 Surge.36 11.9.1 Definition.36 11.9.2 Test method.36 11.9.3 Performance criteria.36 12 Cabinet radiation and antenna port spurious emissions.37 12.1 Conducted spurious emissions conveyed to the antenna.37 12.1.1 Definition.37 12.1.2 Method of measurement.37 12.1.3 Limit.37 12.2 Cabinet radiation.38 12.2.1 Definition.38 12.2.2 Method of measurement.38 12.2.3 Limits.39 13 Transmitter.39 13.1 General conditions.39 13.2 Frequency error.39 13.2.1 Definition.39 13.2.2 Method of measurement.39 13.2.3 Limits.40 13.3 Carrier power.40 13.3.1 Definitions.40 13.3.2 Method of measurement.40 13.3.3 Limits.40 13.3.3.1 General.40 13.3.3.2 Normal test conditions.40 13.3.3.3 Extreme test conditions.40 13.4 Frequency deviation.40 13.4.1 Definition.40 13.4.2 Maximum permissible frequency deviation.41 13.4.2.1 Method of measurement.41 13.4.2.2 Limits.41 13.4.3 Reduction of frequency deviation at modulation frequencies above 3 kHz.41 13.4.3.1 Method of measurement.41 13.4.3.2 Limits.41 SIST EN 301 925 V1.1.1:2003
ETSI ETSI EN 301 925 V1.1.1 (2002-09) 6
13.5 Sensitivity of the modulator including the microphone.42 13.5.1 Definition.42 13.5.2 Method of measurement.42 13.5.3 Limits.42 13.6 Audio frequency response.42 13.6.1 Definition.42 13.6.2 Method of measurement.42 13.6.3 Limits.43 13.7 Audio frequency harmonic distortion of the emission.43 13.7.1 Definition.43 13.7.2 Method of measurement.43 13.7.3 Limits.44 13.8 Adjacent channel power.44 13.8.1 Definition.44 13.8.2 Method of measurement.44 13.8.3 Limits.44 13.9 Residual modulation of the transmitter.44 13.9.1 Definition.44 13.9.2 Method of measurement.45 13.9.3 Limit.45 13.10 Modulator attack time.45 13.10.1 Definition.45 13.10.2 Method of measurement.45 13.10.3 Limit.45 13.11 Transient frequency behaviour of the transmitter.46 13.11.1 Definition.46 13.11.2 Method of measurement.46 13.11.3 Limits.47 13.12 DSC audio input characteristics.49 13.12.1 Definition.49 13.12.2 Method of measurement.49 13.12.3 Limits.49 13.13 DSC audio input limitation.49 13.13.1 Definition.49 13.13.2 Method of measurement.49 13.13.3 Limit.49 13.14 Testing of generated DSC call sequences.49 13.14.1 Definition.49 13.14.2 Method of measurement.50 13.14.3 Requirement.50 14 Receiver.50 14.1 Harmonic distortion and rated audio output power.50 14.1.1 Definition.50 14.1.2 Methods of measurement.50 14.1.3 Limits.51 14.2 Audio frequency response.51 14.2.1 Definition.51 14.2.2 Method of measurement.51 14.2.3 Limits.51 14.3 Maximum usable sensitivity.52 14.3.1 Definition.52 14.3.2 Method of measurement.52 14.3.3 Limits.53 14.4 Amplitude characteristic of the receiver.53 14.4.1 Definition.53 14.4.2 Method of measurement.53 14.4.3 Limits.53 14.5 Co-channel rejection.53 14.5.1 Definition.53 14.5.2 Method of measurement.53 14.5.3 Limit.54 SIST EN 301 925 V1.1.1:2003
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14.6 Adjacent channel selectivity.54 14.6.1 Definition.54 14.6.2 Method of measurement.54 14.6.3 Limits.54 14.7 Spurious response rejection.54 14.7.1 Definition.54 14.7.2 Method of measurement.55 14.7.2.1 Introduction to the method of measurement.55 14.7.2.2 Method of search over the "limited frequency range".55 14.7.2.3 Method of measurement.56 14.7.3 Limit.56 14.8 Intermodulation response.56 14.8.1 Definition.56 14.8.2 Method of measurement.56 14.8.3 Limit.56 14.9 Blocking or desensitization.57 14.9.1 Definition.57 14.9.2 Method of measurement.57 14.9.3 Limit.57 14.10 Receiver noise and hum level.57 14.10.1 Definition.57 14.10.2 Method of measurement.57 14.10.3 Limit.57 14.11 Squelch operation.58 14.11.1 Description.58 14.11.2 Squelch audio muting.58 14.11.2.1 Definition.58 14.11.2.2 Method of measurement.58 14.11.2.3 Limits.58 14.11.3 Squelch operating level.58 14.11.3.1 Definition.
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