IEC 60936-1:1999/AMD1:2002

Amendment 1 - Maritime navigation and radiocommunication equipment and systems - Radar - Part 1: Shipborne radar - Performance requirements - Methods of testing and required test results

General Information

• Status: Replaced
• Publication Date: 13-Jun-2002
• ICS: 47.020.70 - Navigation and control equipment
• Technical Committee: TC 80 - Maritime navigation and radiocommunication equipment and systems
• Drafting Committee: WG 1 - TC 80/WG 1
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 13-Dec-2007

Relations

• Replaced By: IEC 62388:2007 - Maritime navigation and radiocommunication equipment and systems - Shipborne radar - Performance requirements, methods of testing and required test results
• Effective Date: 05-Sep-2023
• Amends: IEC 60936-1:1999 - Maritime navigation and radiocommunication equipment and systems - Radar - Part 1: Shipborne radar - Performance requirements - Methods of testing and required test results
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL IEC
STANDARD
60936-1
AMENDMENT 1
2002-06
Amendment 1
Maritime navigation and radiocommunication
equipment and systems – Radar –
Part 1:
Shipborne radar – Performance requirements –
Methods of testing and required test results
Amendement 1
Matériels et systèmes de navigation et
de radiocommunication maritimes – Radar –
Partie 1:
Radars de navire – Exigences de fonctionnement –
Méthodes d'essai et résultats d'essai exigés

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– 2 – 60936-1 Amend. 1  IEC:2002(E)

FOREWORD
This amendment has been prepared by IEC technical committee 80: Maritime navigation and

radiocommunication equipment and systems.

The text of this amendment is based on the following documents:

FDIS Report on voting
80/341/FDIS 80/346/RVD
Full information on the voting for the approval of this amendment can be found in the report
on voting indicated in the above table.
The committee has decided that the contents of the base publication and its amendments will
remain unchanged until 2003. At this date, the publication will be
• reconfirmed;
• withdrawn;
• replaced by a revised edition, or
• amended.
––––––––––
CONTENTS
Annex D, replace by new title:
Annex D (normative) Unwanted emissions of radar systems – Methods of measurement and
required results
Page 58
Annex D – Measurement methods for spurious emissions
Replace the existing annex D by the following new annex D:

60936-1 Amend. 1  IEC:2002(E) – 3 –

Annex D
(normative)
Unwanted emissions of radar systems –

Methods of measurement and required results

D.1 Introduction
ITU-R has now developed a new recommendation for out-of-band (OOB) emission limits

(D.6.d)). This recommendation is associated with the following recommendations:
a) OOB emissions falling into an adjacent allocated band (D.6.f));
b) boundary between OOB and spurious emissions (D.6.e));
c) spurious emissions – SM.329 (D.6.c)).
Spurious emission limits for radar systems have been incorporated into section II of
appendix 3 of the Radio Regulations, in terms of level, but not in terms of frequency range.
There is no intention at present of a similar treatment for either the OOB or adjacent allocated
band limits.
It has been agreed that within the ITU WRC – 2003 Agenda item 1.8.1, the boundary between
OOB and spurious emissions will be defined for all radio services and incorporated into
Appendix 3 of the Radio Regulations. As this will not occur until after the date of 1 January
2003 (the date at which the new spurious limits apply for new radar installations), there is a
need for this standard to define the boundary conditions based upon the text contained in the
ITU-R Recommendation SM.1539 (D.6.e)).
The purpose of this annex is to define how the requirements of Appendix 3 of the Radio
Regulations and these new ITU Recommendations concerned with unwanted emissions are to
be implemented with regard to marine radars. This includes the requirements, method of
measurement, the results to be obtained and the interpretation of the measurement results.
D.2 Requirements
The requirements are defined in Appendix 3 of the Radio Regulations and the
recommendations listed above in D.1.
The boundary between the OOB and spurious domains and the OOB mask are defined in the

OOB recommendation – Annex 8 in the following manner –
a) (Boundary and mask) – “the mask rolls off at 20 dB per decade from the 40 dB bandwidth
to the spurious level specified in Appendix 3 of the Radio Regulations. The B dB
–40
bandwidth can be offset from the frequency of maximum emission level, but the necessary
bandwidth (1.152 of the Radio Regulations) should be contained completely within the
allocated band”.
b) (Exclusions) – “the OOB limits are not applicable inside exclusive Radiodetermination and
or Earth Exploration Satellite (EES) and Space research service bands, but do apply at
the band edges.”
These requirements are illustrated in Figures D.1 and D.2.
The OOB masks shown in Figures D.1 and D.2 are calculated using the transmitted pulse
width and rise time.
– 4 – 60936-1 Amend. 1  IEC:2002(E)

The necessary bandwidth and the –40 dB bandwidth are generally centred about the

operating frequency but may be offset to take account of spectrum asymmetry.

The OOB mask commences at a level of –40 dB and falls off at the rate of –20 dB per decade

until it meets the spurious emission limit at the OOB boundary.

When the calculated –40 dB bandwidth falls within the allocated band the OOB mask

commences at the edge of the allocated band.

When the –40 dB bandwidth falls outside the allocated band the OOB mask commences at

that point in the adjacent band.

The OOB mask can be offset further into the adjacent band to allow for spectrum
asymmetries, but the necessary bandwidth associated with this mask shall be contained
completely within the allocated band.
The OOB mask emission limits only apply outside the adjacent bands i.e. below 2,7 GHz and
above 3,3 GHz in the case of radars operating in the 2,9 GHz to 3,1 GHz band, and below
8,5 GHz and above 9,8 GHz in the case of radars operating in the 9,3 GHz to 9,5 GHz band.
Emissions in the spurious domain (Figures D.1 and D.2) shall be at least 43 + 10 log PEP or
60 dB, whichever is the least stringent, below the carrier power, as measured in the far field
of the radar. For most current marine radars the limit will be 60 dB and this means that the
spurious domain starts at 5 × B from the operating frequency of the radar.
–40
D.3 Methods of measurement
The basic methods of measurement for unwanted emissions are contained in ITU-R
Recommendation M.1177 (D.6.a)). This describes two methods, referred to as
...