IEC 61097-8:1998

INTERNATIONAL
IEC
STANDARD
61097-8
First edition
1998-09
Global maritime distress
and safety system (GMDSS) –
Part 8:
Shipborne watchkeeping receivers for
the reception of digital selective calling (DSC)
in the maritime MF, MF/HF and VHF bands –
Operational and performance requirements,
methods of testing and required test results
Système mondial de détresse
et de sécurité en mer (SMDSM) –
Partie 8:
Récepteurs de veille de bord pour réception d’appel sélectif
numérique (ASN) dans la gamme des ondes hectométriques,
hectométriques et décamétriques, et métriques –
Exigences opérationnelles et de fonctionnement,
méthodes d’essai et résultats exigibles
Reference number
Numbering
As from 1 January 1997 all IEC publications are issued with a designation in the
60 000 series.
Consolidated publications
Consolidated versions of some IEC publications including amendments are
available. For example, edition numbers 1.0, 1.1 and 1.2 refer, respectively, to the
base publication, the base publication incorporating amendment 1 and the base
publication incorporating amendments 1 and 2.
Validity of this publication
The technical content of IEC publications is kept under constant review by the IEC,
thus ensuring that the content reflects current technology.
Information relating to the date of the reconfirmation of the publication is available
in the IEC catalogue.
Information on the subjects under consideration and work in progress undertaken by
the technical committee which has prepared this publication, as well as the list of
publications issued, is to be found at the following IEC sources:
• IEC web site*
• Catalogue of IEC publications
Published yearly with regular updates
(On-line catalogue)*
• IEC Bulletin
Available both at the IEC web site* and as a printed periodical
Terminology, graphical and letter symbols
For general terminology, readers are referred to IEC 60050: International Electro-
technical Vocabulary (IEV).
For graphical symbols, and letter symbols and signs approved by the IEC for
general use, readers are referred to publications IEC 60027: Letter symbols to be
used in electrical technology, IEC 60417: Graphical symbols for use on equipment.
Index, survey and compilation of the single sheets and IEC 60 617: Graphical symbols
for diagrams.
* See web site address on title page.

INTERNATIONAL
IEC
STANDARD
61097-8
First edition
1998-09
Global maritime distress
and safety system (GMDSS) –
Part 8:
Shipborne watchkeeping receivers for
the reception of digital selective calling (DSC)
in the maritime MF, MF/HF and VHF bands –
Operational and performance requirements,
methods of testing and required test results
Système mondial de détresse
et de sécurité en mer (SMDSM) –
Partie 8:
Récepteurs de veille de bord pour réception d’appel sélectif
numérique (ASN) dans la gamme des ondes hectométriques,
hectométriques et décamétriques, et métriques –
Exigences opérationnelles et de fonctionnement,
méthodes d’essai et résultats exigibles
 IEC 1998  Copyright - all rights reserved
No part of this publication may be reproduced or utilized in any form or by any means, electronic or
mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Electrotechnical Commission 3, rue de Varembé Geneva, Switzerland
Telefax: +41 22 919 0300 e-mail: inmail@iec.ch IEC web site http: //www.iec.ch
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For price, see current catalogue

– 2 – 61097-8 © IEC:1998(E)
CONTENTS
Page
FOREWORD . 4
Clause
1 Scope. 5
2 Normative references. 6
3 Definitions and abbreviations. 6
3.1 Definitions. 6
3.2 Abbreviations. 7
4 General and operational requirements . 8
4.1 General. 8
4.2 Construction. 8
4.3 Controls and indicators. 9
4.4 Software. 9
4.5 Memory. 10
4.6 Interfaces. 10
4.7 Marking and identification. 10
4.8 Instructions. 11
4.9 Warming-up period. 11
4.10 Safety precautions. 11
4.11 Compass safe distance . 11
5 Technical requirements. 12
5.1 Durability and resistance to environmental conditions . 12
5.2 Protection of the antenna input circuit. 12
5.3 Frequency bands and channels . 12
5.4 Mode of reception . 13
5.5 Scanning receivers. 13
5.6 Calling sensitivity. 14
5.7 Adjacent channel selectivity. 14
5.8 Co-channel rejection. 14
5.9 Intermodulation response. 14
5.10 Interference rejection, spurious response and blocking immunity . 14
5.11 Dynamic range. 15
5.12 Conducted spurious emissions into the antenna . 15
5.13 Frequency stability. 15
6 General test conditions. 15
6.1 General. 15
6.2 Test power source. 15
6.3 Normal test conditions. 15
6.4 Extreme test conditions . 16
6.5 Application of test signals to the receiver. 16
6.6 Choice of testing frequencies . 17
6.7 Test signals. 17
6.8 Measurement of bit error rate (BER). 17
6.9 Measurement uncertainty and interpretation of the measuring results . 18

61097-8 © IEC:1998(E) – 3 –
Clause Page
7 Environmental tests. 18
7.1 Procedure. 18
7.2 Performance check. 18
7.3 Vibration tests. 19
7.4 Temperature tests. 20
7.5 Corrosion test. 21
8 MF/HF watchkeeping receiver . 22
8.1 Calling sensitivity. 22
8.2 Adjacent channel selectivity. 23
8.3 Co-channel rejection. 23
8.4 RF intermodulation response. 24
8.5 Spurious response rejection . 24
8.6 Dynamic range. 25
8.7 Conducted spurious emissions into the antenna . 26
8.8 Protection of receiver antenna input circuits . 26
8.9 Stop/start. 27
8.10 Stop/start of scanning efficiency. 27
9 VHF watchkeeping receiver . 27
9.1 Calling sensitivity. 27
9.2 Adjacent channel selectivity. 28
9.3 Co-channel rejection. 28
9.4 Intermodulation response. 29
9.5 Spurious response and blocking immunity . 29
9.6 Dynamic range. 30
9.7 Conducted spurious emissions into the antenna . 30
10 EMC . 31
11 EMI . 31
Annexes
A Relationship between bit error rate (BER) input and symbol error rate (SER) output . 32
B Use of FSK demodulators for testing DSC watchkeeping receivers . 36
C Bibliography . 38

– 4 – 61097-8 © IEC:1998(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
GLOBAL MARITIME DISTRESS AND SAFETY SYSTEM (GMDSS) –
Part 8: Shipborne watchkeeping receivers for the reception of
digital selective calling (DSC) in the maritime MF,
MF/HF and VHF bands –
Operational and performance requirements, methods of
testing and required test results
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, the IEC publishes International Standards. Their preparation is
entrusted to technical committees; any IEC National Committee interested in the subject dealt with may
participate in this preparatory work. International, governmental and non-governmental organizations liaising
with the IEC also participate in this preparation. The IEC collaborates closely with the International Organization
for Standardization (ISO) in accordance with conditions determined by agreement between the two
organizations.
2) The formal decisions or agreements of the IEC on technical matters express, as nearly as possible, an
international consensus of opinion on the relevant subjects since each technical committee has representation
from all interested National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61097-8 has been prepared by IEC technical committee 80:
Maritime navigation and radiocommunication equipment and systems.
The text of this standard is based on the following documents:
FDIS Report on voting
80/191/FDIS 80/208/RVD
Full information on the v
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