ISO 9876:2015

INTERNATIONAL ISO
STANDARD 9876
Third edition
2015-03-15
Ships and marine technology —
Marine facsimile receivers for
meteorological charts
Navires et technologie maritime — Récepteurs marins de
transmissions par télécopie des cartes météorologiques
Reference number
©
ISO 2015
© ISO 2015
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ii © ISO 2015 – All rights reserved

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Requirements . 3
4.1 Construction . 3
4.2 Performance standards for recording unit . 3
4.3 Performance standards for radio receiver . 4
4.4 General requirement of the radio receiver and the recording unit . 4
5 Test methods and required test results . 5
5.1 General test requirements . 5
5.2 General conditions of measurement . 5
5.3 Construction . 5
5.4 Performance tests for recording unit . 5
5.5 Performance tests for radio receiver . 6
5.6 Other tests . 7
6 Marking . 8
7 Information . 8
Bibliography . 9
Foreword
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electrotechnical standardization.
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described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
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The committee responsible for this document is ISO/TC 8, Ships and marine technology, Subcommittee
SC 6, Navigation and ship operations.
This third edition cancels and replaces the second edition (ISO 9876:1997), which has been technically
revised.
iv © ISO 2015 – All rights reserved

INTERNATIONAL STANDARD ISO 9876:2015(E)
Ships and marine technology — Marine facsimile receivers
for meteorological charts
1 Scope
This International Standard specifies the construction, performance, type testing, and inspection for
a ship borne marine facsimile receiver that receives meteorological charts transmitted by “Facsimile
transmission of meteorological chart over radio circuits” stated in accordance with World Meteorological
Organization (WMO) publication No. 386, Part III-5.
This International Standard applies to ship borne radio facsimile receivers for the reception of
meteorological charts and other graphical representation of meteorological conditions intended as an
aid to navigation at sea.
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
IEC 60945, Maritime navigation and radiocommunication equipment and systems – General requirements
–Methods of testing and required test results
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
dead sector
part of scanning line unavailable for picture signal transmissions the criteria of which are within
4,5 % ± 0,5 % of the length
3.2
facsimile
process, or the result of the process, by which fixed graphic charts are scanned and the information is
converted to electric signals which are used remotely to produce a copy of the chart in record form
3.3
F3C
radio emissions designation from ITU Radio Regulations Appendix 1 for frequency modulation, single
channel having analog information, facsimile
3.4
index of cooperation
IOC
value of the index of cooperation, M, is defined as follows:
ML= F /π
where
L is the length of the scanning line, in centimetres;
F is the density of the scanning line, in reciprocal centimetres.
3.5
IOC selection signal
signal for automatic IOC selection in the facsimile receiver which is accomplished by transmission of
alternating black and white signals lasting for 5 s to 10 s with the following frequencies:
— 300 Hz for IOC 576;
— 675 Hz for IOC 288 (or IOC 576 with alternate line scanning).
Note 1 to entry: The envelopes of the signal are approximately rectangular.
3.6
meteorological chart
chart portraying the state of the weather (such as weather conditions, wind force and direction, high or
low atmospheric pressure, weather front and isobar) at a particular time over a wide area
3.7
phasing
adjusting the phase of the independent synchronous power source so as to be able to receive the weather
chart in its correct position
3.8
phasing signal
signal for automatically phasing the facsimile receiver accomplished by a 30 s transmission of alternating
black and white signals with the following frequencies:
— 1 Hz for 60 lines per minute (60 r/min);
— 1,5 Hz for 90 lines per minute (90 r/min);
— 2 Hz for 120 lines per minutes (120 r/min).
Note 1 to entry: This signal may also be used for automatic starting, automatic selection of scanning frequency,
and automatic adjustment of recording levels.
Note 2 to entry: The wave form of this signal is either symmetrical, i.e. black and white, each lasting half the
scanning line, or symmetrical with the white lasting for 5 % and black for 95 % of the scanning line.
3.9
remote control signal
control signal for operating the apparatus from a distance
Note 1 to entry: The remote control signals for operating the facsimile receiver for meteorological charts include
the phasing signal, the IOC selection signal, and stop signal.
3.10
SND/N
value of signal plus noise plus distortion to noise ratio
2 © ISO 2015 – All rights reserved

3.11
SND/ND
value of signal plus noise plus distortion to noise plus distortion ratio
3.12
spurious responses
ratio of the input level of an unwanted signal at the frequency of the spurious response to the input level
of a wanted signal when the wanted and unwanted
...