SIST ETS 300 162:1999

• Abstract:

  Revision of ETS 300 162 to bring it into line with ETR 238 and to form part of a harmonised standard under the EMC Directive together with ET S 300 828.

• Status: Published
• Publication Date: 31-Aug-1999
• ICS: 33.060.20 - Receiving and transmitting equipment
• ICS: 33.100.01 - Electromagnetic compatibility in general
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: RES - Radio equipment and systems
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Sep-1999
• Due Date: 01-Sep-1999
• Completion Date: 01-Sep-1999
• Mandate: T-353
• Ref Project: ETSI ETS 300 162 ed.2 (1998-03) - 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

SIST ETS 300 162:1999 is the Slovenian adoption of ETS 300 162 Edition 2 from ETSI. It specifies minimum requirements, technical characteristics, and methods of measurement for shipborne VHF radiotelephone transmitters and receivers used in the maritime mobile service, including voice and Digital Selective Calling (DSC). The standard is written for equipment manufacturers, test laboratories, approval bodies, and others who need to assess maritime radio equipment against a common technical basis.

What does SIST ETS 300 162:1999 specify?

SIST ETS 300 162:1999 covers shipborne Very High Frequency (VHF) radiotelephone transmitters and receivers fitted with an external antenna connector and intended for use on board ships. It sets minimum requirements for equipment that supports voice and DSC, and it includes the measurement methods used to check those requirements.

The document is organized into:

• Clause 1 Scope
• Clause 2 Normative references
• Clause 3 Definitions, symbols and abbreviations
• Clause 4 General and operational requirements
• Clause 5 Technical requirements
• Clause 6 General conditions of measurement
• Clause 7 Environmental tests
• Clause 8 Transmitter
• Clause 9 Receiver
• Clause 10 Duplex operation
• Annexes A, C, D and E

Annex	What it covers
Annex A	Power measuring receiver specification
Annex C	Frequency Set Information (FSI) command protocol for IEC 1162-1
Annex D	ERC Decision for approval regulations based on this ETS
Annex E	Radiated measurements, test sites, and chamber guidance

What are the key requirements of SIST ETS 300 162:1999?

SIST ETS 300 162:1999 combines shipboard design rules with detailed radio performance checks. In practice, it tells the manufacturer what the set must do, how it must behave on a ship, and how test houses should measure it.

Shipboard design and operating controls

Clause 4.1 requires good engineering construction, shipboard suitability, accessible service parts, and technical documentation. The equipment must operate on all Appendix 18 channels, block channels 75 and 76, and prevent user unblocking of any additional channels that an Administration requires to be blocked. It must also prevent transmission on channel 70 for anything other than DSC, which matters because channel use on ships is tightly controlled.

Clause 4.2 requires a channel selector with a legible channel designator, clear marking of channels 16 and 70, and the basic operating controls listed in the standard. This is important because the user must be able to select emergency and calling channels quickly and without ambiguity.

Safety, audio access, and recovery after power-up

Clauses 4.3 to 4.6 require a handset or microphone, a loudspeaker arrangement, and safe duplex/simpler simplex behavior. Safety provisions cover overcurrent, overvoltage, reverse polarity, exposed metal earthing, protection from contact with high-voltage parts, antenna open- and short-circuit tolerance, and protection of volatile memory during short power interruptions. The equipment must also become operational within 5 s after switch-on, which matters for bridge use and fast recovery after power cycling.

Channel switching, modulation, and DSC interfaces

Clause 5 limits channel change time to 5 s and transmit/receive changeover to 0.3 s. It also specifies phase modulation G3E for speech, G2B for DSC signalling, 25 kHz channel separation, and frequency deviation of about ±5 kHz at 100 % modulation. Clause 5.4 requires 600 ohm symmetrical, floating DSC signal input and output impedances, and it links integral DSC controllers to ETS 300 338.

Measurement and test conditions

Clause 6 fixes the test setup so results are comparable. Receiver input tests use a 50 ohm impedance, normal test modulation is 1 kHz with ±3 kHz deviation, and tests are normally carried out on channel 16 unless otherwise stated. This matters because compliance testing depends on a repeatable test arrangement, not on ad hoc lab practice.

Environmental and performance testing

Clause 7 requires environmental tests before the main equipment tests and includes performance checks, vibration, dry heat, damp heat, and low temperature cycling. The performance check covers transmitter frequency error, transmitter carrier power, and receiver maximum usable sensitivity. For buyers and approvers, this is the part that shows the radio still meets key figures after environmental stress.

Transmitter, receiver, and duplex checks

Clauses 8 and 9 cover the main radio performance items: frequency error, carrier power, frequency deviation, modulator sensitivity, audio response, distortion, adjacent channel power, spurious emissions, residual modulation, DSC audio characteristics, receiver sensitivity, rejection and selectivity, blocking, noise and hum, squelch operation, and multiple watch behavior. Clause 10 adds duplex-specific checks for receiver desensitization and internal mixing when the equipment is intended for duplex use.

What terms does SIST ETS 300 162:1999 define?

• G3E - Phase modulation used for speech, with frequency modulation and 6 dB/octave pre-emphasis.
• G2B - Phase modulation with digital information and a sub-carrier used for DSC operation.
• Digital Selective Calling (DSC) - A calling system used in maritime mobile service for digital signalling.
• Equipment Under Test (EUT) - The radio set or unit being measured during conformance testing.
• Frequency Set Information (FSI) - The IEC 1162-1 command sentence used to set or read frequency, mode, and power.
• Signal + Noise + Distortion / Noise + Distortion (SINAD) - A receiver measurement ratio used to determine usable sensitivity.
• Very High Frequency (VHF) - The frequency range used by this maritime radiotelephone equipment.

Who uses SIST ETS 300 162:1999?

SIST ETS 300 162:1999 is used by manufacturers designing shipborne VHF radios, test laboratories carrying out conformance measurements, and approval or type-approval bodies checking maritime radio equipment. It is also relevant to quality managers, compliance teams, and procurement staff who need to verify that voice and DSC radios match a common technical standard before installation on ships.

What changed in SIST ETS 300 162:1999 from the previous edition?

SIST ETS 300 162:1999 is the second edition of ETS 300 162. The scope states that this revision was made to bring the standard into line with ETR 238 and to form part of a harmonised standard under the EMC Directive together with ETS 300 828.

Which standards are used with SIST ETS 300 162:1999?

The standard relies on several dated and undated references that define channel arrangements, DSC operation, interfaces, and measurement practice:

• Radio Regulations, Appendix 18 and Appendix 19 - define maritime VHF transmitting frequencies and technical characteristics.
• ITU-T Recommendation E.161 - gives the keypad digit and symbol arrangement.
• ITU-R Recommendation M.493-8 and M.541-7 - define DSC signalling and operational procedures.
• IMO Resolution A.803(19) and A.524(13) - set shipborne VHF performance and multiple watch expectations.
• ITU-T Recommendation P.53 - provides the psophometer used in audio measurements.
• IEC 1162-1 - provides the digital interface and the FSI command format.
• ETS 300 828 - supplies the EMC companion requirements for the same class of equipment.
• ETR 028 - gives measurement uncertainty guidance.
• ETS 300 338 - covers DSC equipment characteristics and methods of measurement.
• ITU-R Recommendation SM 332-4 - supports receiver selectivity measurement practice.

What does the SIST ETS 300 162:1999 document contain?

SIST ETS 300 162:1999 contains detailed measurement methods for transmitter and receiver performance, including test connections, modulation conditions, and limit checks. It also includes the setup for transient frequency behaviour, with timing templates and oscilloscope arrangements, and radiated measurement arrangements in Annex E.

The document also provides the FSI command format in Annex C for setting or reading operating parameters, and Annex D reproduces the ERC Decision that ties the technical specification to national approval regulations. In practice, this makes the standard useful both for design verification and for certification testing.

SLOVENSKI STANDARD
01-september-1999
(OHNWURPDJQHWQD]GUXåOMLYRVW(0&LQ]DGHYHY]YH]L]UDGLMVNLPVSHNWURP(50
5DGLRWHOHIRQVNLRGGDMQLNLLQVSUHMHPQLNL]DSUHQRVQHPRELOQHVWRULWYHNL
REUDWXMHMRYSDVRYLK9+)7HKQLþQHNDUDNWHULVWLNHLQPHULOQHPHWRGH
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
Ta slovenski standard je istoveten z: ETS 300 162 Edition 2
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
33.100.01 Elektromagnetna združljivost Electromagnetic compatibility
na splošno in general
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 300 162
TELECOMMUNICATION March 1998
STANDARD Second Edition
Source: ERM Reference: RE/ERM-RP01-022
ICS: 33.020
Key words: EMC, maritime, radio, telephony, testing, VHF
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
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
Postal address: F-06921 Sophia Antipolis CEDEX - FRANCE
Office address: 650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Internet: [e-mail] - http://www.etsi.fr - http://www.etsi.org
Tel.: [phone] - Fax: [phone]
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 1998. All rights reserved.

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ETS 300 162: March 1998
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 300 162: March 1998
Contents
Foreword .9
1 Scope .11
2 Normative references.11
3 Definitions, symbols and abbreviations.12
3.1 Definitions .12
3.2 Symbols .12
3.3 Abbreviations .12
4 General and operational requirements.12
4.1 Construction.12
4.2 Controls and indicators .13
4.3 Handset and loudspeaker.14
4.4 Safety precautions .14
4.5 Labelling.14
4.6 Warm up .14
5 Technical requirements.15
5.1 Switching time.15
5.2 Class of emission and modulation characteristics.15
5.3 Multiple watch facilities .15
5.3.1 Additional performance standards .15
5.3.2 Scanning characteristics .15
5.4 DSC controller interfaces.16
5.4.1 Operational interfaces .16
6 General conditions of measurement .16
6.1 Arrangements for test signals applied to the receiver input.16
6.2 Squelch.16
6.3 Normal test modulation.16
6.4 Artificial antenna .16
6.5 Arrangements for test signals applied to the transmitter input .17
6.6 Test channels .17
6.7 Measurement uncertainty and interpretation of the measured results.17
6.7.1 Measurement uncertainty.17
6.7.2 Interpretation of the measurement results .17
6.8 Test conditions, power sources and ambient temperatures.18
6.8.1 Normal and extreme test conditions.18
6.8.2 Test power source.18
6.9 Normal test conditions .18
6.9.1 Normal temperature and humidity.18
6.9.2 Normal power sources .18
6.9.2.1 Mains voltage and frequency.18
6.9.2.2 Battery power source.18
6.9.2.3 Other power sources .18
6.10 Extreme test conditions .18
6.10.1 Extreme temperatures.18
6.10.2 Extreme values of test power sources .19
6.10.2.1 Mains voltage.19
6.10.2.2 Battery power source.19
6.10.2.3 Other power sources .19
6.11 Procedure for tests at extreme temperatures.19
7 Environmental tests.19
7.1 Procedure .19

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ETS 300 162: March 1998
7.2 Performance check . 19
7.3 Vibration test . 20
7.3.1 Definition. 20
7.3.2 Method of measurement. 20
7.3.3 Requirement . 20
7.4 Temperature tests. 20
7.4.1 Definition. 20
7.4.2 Dry heat . 20
7.4.2.1 Definition . 20
7.4.2.2 Method of measurement. 21
7.4.2.3 Requirement . 21
7.4.3 Damp heat . 21
7.4.3.1 Definition . 21
7.4.3.2 Method of measurement. 21
7.4.3.3 Requirement . 21
7.4.4 Low temperature cycle. 21
7.4.4.1 Definition . 21
7.4.4.2 Method of measurement. 21
7.4.4.3 Requirement . 22
8 Transmitter . 22
8.1 Frequency error. 22
8.1.1 Definition. 22
8.1.2 Method of measurement. 22
8.1.3 Limits . 22
8.2 Carrier power. 22
8.2.1 Definitions . 22
8.2.2 Method of measurement. 22
8.2.3 Limits . 22
8.2.3.1 Normal test conditions . 22
8.2.3.2 Extreme test conditions. 22
8.3 Frequency deviation .23
8.3.1 Definition. 23
8.3.2 Maximum permissible frequency deviation. 23
8.3.2.1 Method of measurement. 23
8.3.2.2 Limits. 23
8.3.3 Reduction of frequency deviation at modulation frequencies above 3 kHz . 23
8.3.3.1 Method of measurement. 23
8.3.3.2 Limits. 23
8.4 Sensitivity of the modulator, including microphone . 24
8.4.1 Definition. 24
8.4.2 Method of measurement. 24
8.4.3 Limits . 24
8.5 Audio frequency response. 24
8.5.1 Definition. 24
8.5.2 Method of measurement. 24
8.5.3 Limit . 24
8.6 Audio frequency harmonic distortion of the emission. 25
8.6.1 Definition. 25
8.6.2 Method of measurement. 25
8.6.2.1 Normal test conditions . 25
8.6.2.2 Extreme test conditions. 25
8.6.3 Limits . 25
8.7 Adjacent channel power. 26
8.7.1 Definition. 26
8.7.2 Method of measurement. 26
8.7.3 Limits . 26
8.8 Conducted spurious emissions conveyed to the antenna. 26
8.8.1 Definition. 26
8.8.2 Method of measurement. 27
8.8.3 Limit . 27
8.9 Cabinet radiation and conducted spurious emissions other than those conveyed to the
antenna . 27

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ETS 300 162: March 1998
8.9.1 Definitions.27
8.9.2 Method of measurement .27
8.9.3 Limits.28
8.10 Residual modulation of the transmitter .28
8.10.1 Definition .28
8.10.2 Method of measurement .28
8.10.3 Limit.28
8.11 DSC audio input characteristics.28
8.11.1 Definition .28
8.11.2 Method of measurement .29
8.11.3 Limits.29
8.12 DSC audio input limitation.29
8.12.1 Definition .29
8.12.2 Method of measurement .29
8.12.3 Limit.29
8.13 Modulation attack time.29
8.13.1 Definition .29
8.13.2 Method of measurement .29
8.13.3 Limit.30
8.14 Transient frequency behaviour of the transmitter .31
8.14.1 Definitions.31
8.14.2 Method of measurement .31
9 Receiver .34
9.1 Harmonic distortion and rated audio frequency output power .34
9.1.1 Definition .34
9.1.2 Methods of measurement .34
9.1.3 Limits.34
9.2 Audio frequency response .34
9.2.1 Definition .34
9.2.2 Method of measurement .34
9.2.3 Limits.35
9.3 Maximum usable sensitivity .35
9.3.1 Definition .35
9.3.2 Method of measurement .36
9.3.3 Limits.36
9.4 Co-channel rejection.36
9.4.1 Definition .36
9.4.2 Method of measurement .36
9.4.3 Limit.36
9.5 Adjacent channel selectivity.36
9.5.1 Definition .36
9.5.2 Method of measurement .37
9.5.3 Limits.37
9.6 Spurious response rejection .37
9.6.1 Definition .37
9.6.2 Method of measurement .37
9.6.3 Limit.37
9.7 Intermodulation response .38
9.7.1 Definition .38
9.7.2 Method of measurement .38
9.7.3 Limit.38
9.8 Blocking or desensitization .38
9.8.1 Definition .38
9.8.2 Method of measurement .38
9.8.3 Limit.38
9.9 Conducted spurious emissions.39
9.9.1 Definition .39
9.9.2 Method of measurement .39
9.9.3 Limit.39
9.10 Radiated spurious emissions.39
9.10.1 Definition .39
9.10.2 Method of measurements .39

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ETS 300 162: March 1998
9.10.3 Limit . 40
9.11 Receiver noise and hum level . 40
9.11.1 Definition. 40
9.11.2 Method of measurement. 40
9.11.3 Limit . 40
9.12 Squelch operation . 40
9.12.1 Definition. 40
9.12.2 Method of measurement. 41
9.12.3 Limits . 41
9.13 Squelch hysteresis . 41
9.13.1 Definition. 41
9.13.2 Method of measurement. 41
9.13.3 Limit . 41
9.14 Multiple watch characteristic . 42
9.14.1 Definition. 42
9.14.2 Method of measurement. 42
9.14.3 Limits . 42
9.15 DSC audio output characteristic. 42
9.15.1 Definition. 42
9.15.2 Methods of measurement. 42
9.15.3 Limit . 43
10 Duplex operation. 43
10.1 Receiver desensitization with simultaneous transmission and reception. 43
10.1.1 Definition. 43
10.1.2 Method of measurement. 43
10.1.3 Limits . 43
10.2 Duplex transceiver internal mixing . 43
10.2.1 Definition. 43
10.2.2 Method of measurement. 43
10.2.3 Limits . 44
Annex A (normative): Measuring receiver for adjacent channel power measurement. 45
A.1 Power measuring receiver specification . 45
A.1.1 IF filter . 45
A.1.2 Attenuation indicator. 46
A.1.3 RMS value indicator . 46
A.1.4 Oscillator and amplifier. 46
Annex B (normative): Subclauses of this ETS relevant for compliance with the essential
requirements of relevant EC Council Directives . 47
Annex C (normative): Protocol for the IEC 1162-1 [9] commands Frequency Set Information (FSI). 48
C.1 Frequency Set Information (FSI) . 48
Annex D (normative): ERC Decision on the adoption of approval regulations for radiotelephone
transmitters and receivers for the maritime mobile service operating in the
frequency range 156 MHz to 174 MHz, based on European
Telecommunications Standard (ETS) 300 162. 49
Annex E (normative): Radiated measurements. 57
E.1 Test sites and general arrangements for measurements involving the use of radiated fields . 57
E.1.1 Outdoor test site. 57
E.1.2 Test antenna . 57
E.1.3 Substitution antenna. 58
E.1.4 Optional additional indoor site . 58
E.2 Guidance on the use of radiation test sites . 59
E.2.1 Measuring distance . 59
E.2.2 Test antenna . 59

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ETS 300 162: March 1998
E.2.3 Substitution antenna .59
E.2.4 Artificial antenna .59
E.2.5 Auxiliary cables .60
E.2.6 Acoustic measuring arrangement.60
E.3 Further optional alternative indoor test site using an anechoic chamber .60
E.3.1 Example of the construction of a shielded anechoic chamber .60
E.3.2 Influence of parasitic reflections in anechoic chambers .61
E.3.3 Calibration of the shielded anechoic chamber.62
History.64

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ETS 300 162: March 1998
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ETS 300 162: March 1998
Foreword
This second edition European Telecommunication Standard (ETS) has been produced by the
Electromagnetic compatibility and Radio spectrum Matters (ERM) Technical Committee of the European
Telecommunications Standards Institute (ETSI).
This ETS has been produced by ETSI in response to a mandate from the European Commission issued
under Council Directive 83/189/EEC (as amended) laying down a procedure for the provision of
information in the field of technical standards and regulations.
This ETS, together with ETS 300 828 [10], is intended to become a Harmonized Standard, the reference
of which will be published in the Official Journal of the European Communities referencing the Council
Directive on the approximation of the laws of the Member States relating to electromagnetic compatibility
("the EMC Directive") (89/336/EEC as amended).
Technical specifications relevant to the EMC Directive are given in annex B.
Annex D contains the ERC Decision which references the technical specifications in this ETS for inclusion
in national type approval regulations.
Transposition dates
Date of adoption of this ETS: 6 February 1998
Date of latest announcement of this ETS (doa): 30 June 1998
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 December 1998
Date of withdrawal of any conflicting National Standard (dow): 31 December 1998

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ETS 300 162: March 1998
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ETS 300 162: March 1998
1 Scope
This ETS specifies the minimum requirements for shipborne Very High Frequency (VHF) transmitters and
receivers capable of voice and Digital Selective Calling (DSC), fitted with an external antenna connector
for use on board ships.
This ETS lays down minimum requirements for VHF radio transmitters and receivers operating in certain
frequency bands allocated to the maritime mobile service, and incorporates the requirements of the
relevant recommendations of the International Maritime Organization (IMO).
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] Radio Regulations, Appendix 18 (1990): "Table of Transmitting Frequencies in
the Band 156 - 174 MHz for Stations in the Maritime Mobile Service".
[2] Radio Regulations, Appendix 19 (1990): "Technical Characteristics for
Transmitters and Receivers used in the Maritime Mobile Service in the Band
156 - 174 MHz".
[3] ITU-T Recommendation E.161 (1993): "Arrangement of digits, letters and
symbols on telephones and other devices that can be used for gaining access to
a telephone network".
[4] Recommendation ITU-R M.493-8 (1997): "Digital selective-calling system for
use in the maritime mobile service".
[5] Recommendation ITU-R M.541-7 (1997): "Operational procedures for the use of
digital selective-calling (DSC) equipment in the maritime mobile service".
[6] IMO Resolution A.803(19): "Performance Standards for Shipborne VHF Radio
Installations capable of Voice Communications and Digital Selective Calling".
[7] IMO Resolution A.524(13): "Performance Standard for VHF Multiple Watch
facilities".
[8] ITU-T Recommendation P.53 (1988): "Psophometer for use on telephone-type
circuits".
[9] IEC 1162-1 (1995-11): "Maritime navigation and radiocommunication equipment
and systems - Digital interfaces - Part 1: Single talker and multiple listeners".
[10] ETS 300 828 (1997): "Radio Equipment and Systems (RES); ElectroMagnetic
Compatibility (EMC) for radiotelephone transmitters and receivers for the
maritime mobile service operating in the VHF bands".
[11] ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the
measurement of mobile radio equipment characteristics".
[12] ETS 300 338: "Radio Equipment and Systems (RES); Technical characteristics
and methods of measurement for equipment for generation, transmission and
reception of Digital Selective Calling (DSC) in the maritime MF, MF/HF and/or
VHF mobile service".
[13] ITU-R Recommendation SM 332-4: "Selectivity of receivers".

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ETS 300 162: March 1998
3 Definitions, symbols and abbreviations
3.1 Definitions
For the purpose of this ETS, the following definitions apply:
G3E: Phase-modulation (Frequency modulation with a pre-emphasis of 6 dB/octave) for speech.
G2B: Phase-modulation with digital information, with a sub-carrier for Digital Selective Calling (DSC)
operation.
modulation index: The ratio between the frequency deviation and the modulation frequency.
performance check: A check of:
- the transmitter carrier power and frequency; and
- receiver sensitivity (see subclause 7.2).
3.2 Symbols
For the purposes of this ETS, the following symbols apply:

-5
dBA relative to 2 x 10 Pa
e.m.f. electromotive force
3.3 Abbreviations
For the purposes of this ETS, the following abbreviations apply:
ad amplitude difference
DSC Digital Selective Calling
EUT Equipment Under Test
fd frequency difference
FSI Frequency Set Information
RF Radio Frequency
rms root mean square
SFI Scanning Frequency Information
SINAD Signal + Noise + Distortion / Noise + Distortion
VHF Very High Frequency
4 General and operational requirements
4.1 Construction
The manufacturer shall declare that compliance to the requirement of clause 4 is achieved and shall
provide relevant documentation.
The mechanical and electrical construction and finish of the equipment shall conform in all respects to
good engineering practice, and the equipment shall be suitable for use on board ships.
All controls shall be of sufficient size to enable the usual control functions to be easily performed and the
number of controls should be the minimum necessary for simple and satisfactory operation.
All parts of the equipment to be checked during inspection or maintenance operations shall be readily
accessible. The components shall be readily identifiable.
Technical documentation shall be supplied with the equipment.
The VHF maritime mobile service uses both single-frequency and two-frequency channels. For
two-frequency channels there shall be a separation of 4,6 MHz between the transmitting frequency and
the receiving frequency (see Radio Regulations [1]).

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ETS 300 162: March 1998
The equipment, which can consist of more than one unit, shall be capable of operating on single
frequency and two-frequency channels with manual control (simplex). It may also be capable of operating
on two-frequency channels without manual control (duplex).
The equipment shall be able to operate on all channels defined in Appendix 18 to the Radio
Regulations [1].
Operation on channels 75 and 76 shall be prevented by appropriate means. Additional VHF channels
outside those defined by Appendix 18 to the Radio Regulations [1] may also be provided, but means shall
be provided to block any or all of these additional channels, as may be required by an Administration,
before installation on board ships. It shall not be possible for the user to unblock or block these additional
channels.
The equipment shall be so designed that use of channel 70 for purposes other than Digital Selective
Calling (DSC) is prevented (see Recommendation ITU-R M.493-8 [4] and Recommendation
ITU-R M.541-7 [5]).
It shall not be possible to transmit while any frequency synthesizer used within the transmitter is out of
lock.
It shall not be possible to transmit during channel switching operations.
4.2 Controls and indicators
The equipment shall have a channel selector and shall indicate the designator, as shown in Appendix 18
to the Radio Regulations [1], of the channel at which the installation is set. The channel designator shall
be legible irrespective of the external lighting conditions.
Channels 16 and 70 should be distinctively marked. Selection of channel 16, and if possible channel 70,
shall be by readily accessible means (e.g. a distinctively marked key). Where an input panel on the
equipment for entering the digits 0 - 9 is provided, this shall conform to ITU-T Recommendation E.161 [3].
The equipment shall have the following additional controls and indicators (see IMO Resolution
A.803(19) [6]):
- on/off switch for the entire installation with a visual indication that the installation is in operation;
- a manual non-locking push to talk switch to operate the transmitter;
- on/off switch for the loudspeaker;
- a switch for reducing transmitter output power to no more than 1 W;
- an audio frequency power volume control;
- a squelch control;
- a control for reducing the brightness of the equipment illumination to zero;
- a visual indication that the transmitter is activated.
The equipment shall also meet the following requirements:
- the user shall not have access to any control which, if wrongly set, might impair the technical
characteristics of the equipment;
- if the accessible controls are located on a separate console and if there are two or more control
consoles, one of the consoles shall have priority over the others. If there are two or more control
consoles, the operation of one console shall be indicated on the other consoles.

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ETS 300 162: March 1998
4.3 Handset and loudspeaker
The equipment shall be fitted with a telephone handset or microphone, and an integral loudspeaker and/or
a socket for an external loudspeaker. A handset is required if duplex operation is provided.
It shall be possible to switch off the loudspeaker without causing a variation in the audio frequency power
provided to the handset, if supplied.
During transmission in simplex operation the receiver output shall be muted. During transmission in
duplex operation only the handset shall be operative. Measures shall be taken to ensure correct operation
when duplex is used and precautions shall be taken to prevent harmful electrical or acoustic feedback
which might produce oscillations.
4.4 Safety precautions
Measures shall be taken to protect the equipment against the effects of overcurrent or overvoltage.
Measures shall be taken to prevent damage to the equipment that might arise from an accidental reversal
of polarity of the electrical power source.
Means shall be provided for earthing exposed metallic parts of the equipment but this shall not cause any
terminal of the source of electrical energy to be earthed.
All components and wiring in which the dc or ac voltage (other than radio-frequency voltage), produce,
singly or in combination, peak voltages in excess of 50 V, shall be protected against any accidental
access and shall be automatically isolated from all electrical power sources if the protective covers are
removed. Alternatively, the equipment shall be constructed in such a way as to prevent access to
components operating at such voltages unless an appropriate tool is used such as a nut-spanner or
screwdriver. Conspicuous warning labels shall be affixed both inside the equipment and on the protective
covers.
No damage to the equipment shall occur when the antenna terminals are placed on open circuit or short
circuit for a period of at least 5 minutes in each case.
In order to provide protection against damage due to the build up of static voltages at the antenna
terminals, there shall be a dc path from the antenna terminals to chassis not exceeding 100 kW.
The information in any volatile memory device shall be protected from interruptions in the power supply of
up to 60 s duration.
4.5 Labelling
All controls, instruments, indicators and terminals shall be clearly labelled (see IMO Resolution
A.803(19) [6]).
Details of the power supply from which the equipment is intended to operate shall be clearly indicated on
the equipment.
All units of the equipment shall be clearly marked on the exterior with the identification of the
manufacturer, type designation of the equipment, and the serial number of the unit.
The compass safe distance shall be stated on the equipment or in the user document supplied with the
equipment.
4.6 Warm up
After being switched on the equipment shall be operational within 5 s.

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ETS 300 162: March 1998
5 Technical requirements
5.1 Switching time
The channel switching arrangement shall be such that the time necessary to change over from using one
of the channels to using any other channel does not exceed 5 s.
The time necessary to change over from transmission to reception or vice versa, shall not exceed 0,3 s.
5.2 Class of emission and modulation characteristics
The equipment shall use phase modulation, G3E (frequency modulation with a pre-emphasis of
6 dB/octave) for speech, and G2B for DSC signalling (see Radio Regulations, Appendix 19 [2]).
The
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