ETSI ETS 300 373 ed.1 (1995-08)

SLOVENSKI STANDARD
01-oktober-1999
5DGLMVNDRSUHPDLQVLVWHPL5(67HKQLþQHNDUDNWHULVWLNHLQPHULOQHPHWRGH]D
SRPRUVNHPRELOQHRGGDMQLNHLQVSUHMHPQLNH]DXSRUDERQDVUHGQMHYDORYQHP0)
LQNUDWNRYDORYQHP+)SRGURþMX
Radio Equipment and Systems (RES); Technical characteristics and methods of
measurements for maritime mobile transmitters and receivers for use in the MF and HF
bands
Ta slovenski standard je istoveten z: ETS 300 373 Edition 1
ICS:
33.060.20 Sprejemna in oddajna Receiving and transmitting
oprema equipment
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 300 373
TELECOMMUNICATION August 1995
STANDARD
Source: ETSI TC-RES Reference: DE/RES-01-03
ICS: 33.060.20
maritime, radiotelephony
Key words:
Radio Equipment and Systems (RES);
Technical characteristics and methods of measurement for
maritime mobile transmitters and receivers for
use in the MF and HF bands
ETSI
European Telecommunications Standards Institute
ETSI Secretariat
F-06921 Sophia Antipolis CEDEX - FRANCE
Postal address:
650 Route des Lucioles - Sophia Antipolis - Valbonne - FRANCE
Office address:
c=fr, a=atlas, p=etsi, s=secretariat - secretariat@etsi.fr
X.400: Internet:
Tel.: +33 92 94 42 00 - Fax: +33 93 65 47 16
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 1995. All rights reserved.
New presentation - see History box

Page 2
ETS 300 373: August 1995
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.

Page 3
ETS 300 373: August 1995
Contents
Foreword .9
1 Scope .11
2 Normative references.11
3 Definitions, abbreviations and symbols.12
3.1 Definitions .12
3.2 Abbreviations .12
3.3 Symbols .12
4 General requirements .13
4.1 Construction.13
4.1.1 Design .13
4.1.2 Inspection and maintenance .13
4.1.3 Illumination .13
4.1.4 Antenna static protection.13
4.1.5 Digital input panels .13
4.1.6 Audio frequencies interfaces.13
4.1.7 Antenna matching .14
4.2 Controls and indicators .14
4.2.1 General.14
4.2.2 Ease of use .14
4.2.3 Loudspeaker switching.14
4.2.4 Noise reducer.15
4.2.5 Frequency indication and class of emission.15
4.2.6 Synthesiser lock .15
4.2.7 Channel switching .15
4.2.8 Distress controls.15
4.2.9 Telephony transmit control.15
4.2.10 Misuse .15
4.2.11 Control panel priority .15
4.2.12 Manual gain control and Automatic Gain Control (AGC).15
4.2.13 Output indication .16
4.3 Labels .16
4.3.1 General.16
4.3.2 Power supplies .16
4.3.3 Distress frequencies.16
4.3.4 Manufacturer .16
4.3.5 Compass safe distance.16
4.4 Safety precautions .16
4.4.1 Protection .16
4.4.2 Earthing .16
4.4.3 Access.17
4.4.4 Memories.17
4.5 Classes of emission.17
4.6 Frequency bands .17
4.6.1 MF band .17
4.6.2 HF bands.17
4.7 Warming up period .17
4.7.1 Time .17
4.7.2 Heaters.18
4.7.3 Heating circuits.18
4.7.4 Delay .18
4.8 Instructions.18
4.8.1 Repair instructions.18
4.8.2 Accessibility.18

Page 4
ETS 300 373: August 1995
5 Test conditions. 18
5.1 General. 18
5.2 Test power source. 18
5.3 Normal test conditions. 19
5.3.1 Normal temperature and humidity . 19
5.3.2 Normal test power source. 19
5.3.2.1 Mains voltage and frequency . 19
5.3.2.2 Secondary battery power sources. 19
5.3.2.3 Other power sources. 19
5.4 Extreme test conditions. 19
5.4.1 Extreme temperature tests . 19
5.4.2 Extreme values of test power source . 19
5.4.2.1 Mains voltage and mains frequency. 19
5.4.2.2 Secondary battery power sources. 19
5.4.2.3 Other power sources. 19
5.5 Artificial antennas. 20
5.5.1 Transmitters. 20
5.5.2 Receivers. 20
5.6 Standard test signals. 20
5.6.1 Test signals applied to the receiver input . 20
5.6.1.1 Sources. 20
5.6.1.2 Levels. 20
5.6.2 Normal test signals . 20
5.6.2.1 Class of emission J3E. 20
5.6.2.2 Class of emission H3E (2 182 kHz only). 21
5.6.2.3 Class of emission F1B . 21
5.6.3 Choice of testing frequencies . 21
5.7 Measurement uncertainty and interpretation of the measuring results. . 21
5.7.1 Measurement uncertainty . 21
5.7.2 Interpretation of measurement results. 21
6 Environmental tests . 22
6.1 Introduction. 22
6.2 Procedure. 22
6.3 Performance check . 22
6.4 Vibration test . 23
6.4.1 Method of measurement. 23
6.4.2 Requirement . 23
6.5 Temperature tests. 23
6.5.1 General . 23
6.5.2 Dry heat . 23
6.5.2.1 Internally mounted equipment. 23
6.5.2.1.1 Method of measurement . 23
6.5.2.1.2 Requirement. 24
6.5.2.2 Externally mounted equipment. 24
6.5.2.2.1 Method of measurement . 24
6.5.2.2.2 Requirement. 24
6.5.3 Damp heat . 24
6.5.3.1 Method of measurement. 24
6.5.3.2 Requirement . 25
6.5.4 Low temperature cycle. 25
6.5.4.1 Internally mounted equipment. 25
6.5.4.1.1 Method of measurement . 25
6.5.4.1.2 Requirement. 25
6.5.4.2 Externally mounted equipment. 25
6.5.4.2.1 Method of measurement . 25
6.5.4.2.2 Requirement. 25
6.6 Corrosion test. 26
6.6.1 General . 26
6.6.2 Method of measurement. 26
6.6.3 Requirements . 26
6.7 Rain test . 27
6.7.1 General . 27

Page 5
ETS 300 373: August 1995
6.7.2 Method of measurement .27
6.7.3 Requirements.27
7 Transmitter .27
7.1 General .27
7.1.1 Output power reduction .27
7.1.2 Class of emission .27
7.1.3 Class of emission on the distress frequency 2 182 kHz.28
7.1.3.1 Initial selection .28
7.1.3.2 Subsequent use.28
7.1.4 Radiotelephone alarm signal generator .28
7.1.5 Minimum number of operating frequencies.28
7.1.5.1 Transmitters operating between 1 605 - 4 000 kHz only .28
7.1.5.2 Transmitters operating between 1 605 - 27 500 kHz.28
7.2 Frequency error .28
7.2.1 Definition .28
7.2.2 Method of measurement .28
7.2.3 Limits.29
7.3 Output power and intermodulation products.29
7.3.1 Definitions.29
7.3.2 Method of measurement .29
7.3.3 Limits.30
7.3.3.1 Output power in the range 1 605 - 4 000 kHz for all
modulation modes .30
7.3.3.2 Output power in the range 4 - 27,5 MHz for all modulation
modes.30
7.3.3.3 Intermodulation products for SSB telephony modes .30
7.3.3.4 Difference of power of B-state frequency and Y-state
frequency.30
7.3.3.5 Output spectrum.31
7.4 Unwanted frequency modulation .31
7.4.1 Definition .31
7.4.2 Method of measurement .31
7.4.3 Limits.32
7.5 Sensitivity of the microphone.32
7.5.1 Definition .32
7.5.2 Method of measurement .32
7.5.3 Limits.32
7.6 Sensitivity of the 600 Ω line input for SSB telephony.32
7.6.1 Definition .32
7.6.2 Method of measurement .32
7.6.3 Limits.32
7.7. Automatic level control and/or limiter for SSB telephony.32
7.7.1 Method of measurement .32
7.7.2 Limits.33
7.8 Audio frequency response of SSB telephony .33
7.8.1 Definition .33
7.8.2 Method of measurement .33
7.8.3 Limits.34
7.9 Power of out-of-band emissions of SSB telephony .34
7.9.1 Definition .34
7.9.2 Method of measurement .34
7.9.3 Limits.35
7.10 Power of conducted spurious emissions of SSB telephony.35
7.10.1 Definition .35
7.10.2 Method of measurement .35
7.10.3 Limits.35
7.11 Residual hum and noise power for telephony.35
7.11.1 Definition .35
7.11.2 Method of measurement .36
7.11.3 Limits.36
7.12 Residual frequency modulation on DSC.36
7.12.1 Definition .36

Page 6
ETS 300 373: August 1995
7.12.2 Method of measurement. 36
7.12.3 Limits . 36
7.13 Carrier suppression. 36
7.13.1 Definition. 36
7.13.2 Method of measurement. 36
7.13.3 Limits . 37
7.14 Continuous operation on telephony. 37
7.14.1 Definition. 37
7.14.2 Method of measurement. 37
7.14.3 Limits . 37
7.15 Protection of transmitter. 37
7.15.1 Definition. 37
7.15.2 Method of measurement. 37
7.15.3 Limits . 37
7.16 Radiotelephone alarm signal requirements. 37
7.16.1 Frequency and duration of tones . 37
7.16.1.1 Definition . 37
7.16.1.2 Method of measurement. 38
7.16.1.3 Limits. 38
7.16.2 Duration of the alarm signal. 38
7.16.2.1 Definition . 38
7.16.2.2 Method of measurement. 38
7.16.2.3 Limit. 38
7.16.3 Modulation depth . 38
7.16.3.1 Definition . 38
7.16.3.2 Method of measurement. 38
7.16.3.3 Limit. 38
8 Receiver. 38
8.1 Receiver output powers. 38
8.1.1 Standard output power . 38
8.1.2 Rated output power . 39
8.2 Frequency error. 39
8.2.1 Definition. 39
8.2.2 Method of measurement. 39
8.2.3 Limits . 39
8.3 Unwanted frequency modulation. 39
8.3.1 Definition. 39
8.3.2 Method of measurement. 39
8.3.3 Limits . 40
8.4 Pass band . 40
8.4.1 Definition. 40
8.4.2 Method of measurement. 40
8.4.2.1 Class of emission J3E. 40
8.4.2.2 Class of emission H3E. 40
8.4.3 Limits . 40
8.5 Maximum usable sensitivity. 40
8.5.1 Definition. 40
8.5.2 Methods of measurement. 41
8.5.3 Limits . 41
8.6 Adjacent signal selectivity . 41
8.6.1 Definition. 41
8.6.2 Method of measurement. 41
8.6.3 Limits . 42
8.7 Blocking. 42
8.7.1 Definition. 42
8.7.2 Method of measurement. 42
8.7.3 Limits . 43
8.8 Cross modulation . 43
8.8.1 Definition. 43
8.8.2 Method of measurement. 43
8.8.3 Limits . 43
8.9 Intermodulation. 44

Page 7
ETS 300 373: August 1995
8.9.1 Definition .44
8.9.2 Method of measurement .44
8.9.2.1 Class of emission J3E. .44
8.9.2.2 Class of emission H3E .44
8.9.2.3 Class of emission F1B analogue.44
8.9.2.4 Class of Emission F1B digital .45
8.9.3 Limits.45
8.10 Reciprocal mixing .45
8.10.1 Definition .45
8.10.2 Method of measurement .45
8.10.3 Results .46
8.11 Spurious response rejection ratio .46
8.11.1 Definition .46
8.11.2 Method of measurement .46
8.11.3 Limits.47
8.12 Harmonic content in output.47
8.12.1 Definition .47
8.12.2 Method of measurement .47
8.12.3 Limits.48
8.13 Audio frequency intermodulation .48
8.13.1 Definition .48
8.13.2 Method of measurement .48
8.13.3 Limits.48
8.14 Spurious emissions.48
8.14.1 Definition .48
8.14.2 Methods of measurement .48
8.14.3 Limits.48
8.15 Internally generated spurious signals .49
8.15.1 Definition .49
8.15.2 Method of measurement .49
8.15.3 Limits.49
8.16 AGC efficiency .49
8.16.1 Definition .49
8.16.2 Method of measurement and limits.49
8.16.2.1 Settings.49
8.16.2.2 Increase in Signal-to-Noise Ratio (SNR) .49
8.16.2.3 Range .49
8.17 AGC time constants (attack and recovery time) .49
8.17.1 Definitions.49
8.17.2 Method of measurement .50
8.17.3 Limits.50
8.18 Protection of input circuits.50
8.18.1 Definition .50
8.18.2 Method of measurement .50
8.18.3 Limit.50
Annex A (informative): Bibliography.51
History.52

Page 8
ETS 300 373: August 1995
Blank page
Page 9
ETS 300 373: August 1995
Foreword
This European Telecommunication Standard (ETS) has been produced by the Radio Equipment and
Systems (RES) Technical Committee of the European Telecommunications Standards Institute (ETSI).
The ETS sets out the minimum requirements for Medium Frequency (MF) and Medium and High
Frequency (MF/HF) equipment on board ships, operating in the maritime mobile MF and HF radio
services.
Every ETS prepared by ETSI is a voluntary standard. This ETS contains text concerning conformance
testing of the equipment to which it relates. This text should be considered only as guidance and does not
make this ETS mandatory.
Transposition dates
Date of adoption of this ETS: 26 June 1995
Date of latest announcement of this ETS (doa): 30 November 1995
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 31 May 1996
Date of withdrawal of any conflicting National Standard (dow): 31 May 1996

Page 10
ETS 300 373: August 1995
Blank page
Page 11
ETS 300 373: August 1995
1 Scope
This European Telecommunication Standard (ETS) states the minimum requirements for radio
transmitters and receivers, for use on ships, operating in either the Medium Frequency (MF) only or in the
Medium and High Frequency (MF/HF) bands allocated in the International Telecommunications Union
(ITU) Radio Regulations [1], to the Maritime Mobile Service (MMS).
This ETS refers to equipment for one or more of the following:
- Single SideBand (SSB) modulation for telephony transmission and reception; (J3E)
- Frequency Shift Keying (FSK) or SSB modulation of a keyed sub-carrier to transmit and receive
Digital Selective Calling (DSC) signals in accordance with ITU-R Recommendation 493-5 [5].
This ETS also refers to radio equipment, which is not integrated with the DSC encoder or decoder, but
defines the interfaces with such equipment.
NOTE: The requirements for integrated equipment may be found in other relevant ETSs.
The tests in this ETS are applicable to receivers for operating on all frequencies in the bands 1 605 kHz to
4 000 kHz or 1 605 kHz to 27,5 MHz as allocated in the Radio Regulations [1], to the MMS.
Other spot frequency receivers should meet all the requirements of this ETS and other relevant standards
as applicable for the frequencies and modes provided.
This ETS includes the International Maritime Organisation (IMO) and ITU requirements included in the
relevant provisions of the Radio Regulations [1], the International Convention for the Safety Of Life At Sea
(SOLAS) [3], and the IMO Resolutions A.421(XI), A.610(15), A.613(15), and A.694(17) [4].
If the equipment, or parts of it, are designed in such a manner that they can be used for other categories
of maritime radiocommunication (e.g. Morse telegraphy or NBDP (ETS 300 067) [9]), those parts of the
equipment should fulfil the relevant requirements of the appropriate standards for the service(s) in
question e.g. ETS 300 067 [9].
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] ITU Radio Regulations.
[2] CCITT Recommendation E.161 (1988): "Arrangement of figures, letters and
symbols on telephones and other devices that can be used for access to a
telephone network".
[3] International Convention for the Safety of Life at Sea, (SOLAS), as amended
1988.
[4] IMO Resolutions A.421(XI), A.610(15), A.613(15) and A.694(17).
[5] ITU-R Recommendation 493-5: "Digital Selective Calling System for use in the
Maritime Mobile Service".
[6] NMEA 0183, Version 2.00: "Standard for interfacing marine electronic devices".
[7] ISO Standard 3791: "Office machines and data processing equipment -
Keyboard layout for numeric applications".

Page 12
ETS 300 373: August 1995
[8] ETR 028: "Radio Equipment and Systems (RES); Uncertainties in the
measurement of mobile radio equipment characteristics".
[9] ETS 300 067: "Radio Equipment and Systems (RES); Radiotelex equipment
operating in the maritime MF/HF service Technical Characteristics and methods
of measurement".
3 Definitions, abbreviations and symbols
3.1 Definitions
For the purposes of this ETS the following definitions apply:
assigned frequency: The centre of the frequency band assigned to a station.
carrier frequency: The frequency to which the transmitter or receiver is tuned.
3.2 Abbreviations
For the purposes of this ETS the following abbreviations apply:
AGC Automatic Gain Control
DSC Digital Selective Calling
EE Equipment Engineering
emf electromotive force
FSK Frequency Shift Keying
IEC International Electrotechnical Committee
IMO International Maritime Organisation
ISO International Standards Organisation
ITU International Telecommunications Union
MF Medium Frequency
MF/HF Medium and High Frequency
MMS Maritime Mobile Service
NBDP Narrow Band Direct Printing telegraphy
NMEA National Maritime Electronic Association
RMS Root Mean Square
SNR Signal-to-Noise Ratio
SOLAS Safety Of Life At Sea
SSB Single SideBand
USB Upper SideBand
3.3 Symbols
For the purposes of this ETS the following symbols apply as defined in the Radio Regulations [1]:
F1B frequency modulation, single channel containing quantized or digital information
without the use of a modulating sub-carrier, telegraphy for automatic reception.
H3E SSB, full carrier, single channel containing analogue information, telephony.
J2B SSB, suppressed carrier, single channel containing quantized or digital
information with the use of a modulating sub-carrier, telegraphy for automatic
reception.
J3E SSB, suppressed carrier, single channel containing analogue information,
telephony.
Page 13
ETS 300 373: August 1995
4 General requirements
4.1 Construction
4.1.1 Design
In all respects the mechanical and electrical design and construction and the finish of the equipment shall
conform with good engineering practice, and the equipment shall be suitable for use on board ships at
sea.
4.1.2 Inspection and maintenance
All parts of the equipment which are subject to inspection and maintenance adjustments shall be easily
accessible. Components shall be easily identifiable, either by markings within the equipment or with the
aid of the technical description.
The equipment shall be so designed that the main units can be replaced readily, without elaborate
re-calibration or re-adjustment.
4.1.3 Illumination
Equipment intended to be installed on the navigating bridge of a ship shall be provided with adequate
illumination to enable identification of controls and facilitate reading of indicators at all times. Means shall
be provided for reducing continuously, to extinction, the output of any light source on the equipment which
is capable of interfering with navigation.
4.1.4 Antenna static protection
In order to provide protection against damage due to static voltages which may appear at the input of the
receiver, there shall be a dc path from the antenna terminal to chassis not exceeding 100 k Ω.
4.1.5 Digital input panels
Where a digital input panel with the digits "0" to "9" is provided, the digits shall be arranged to conform
with CCITT Recommendation E.161 [2]. However, where an alphanumeric keyboard layout is provided,
the digits "0" to "9" may, alternatively, be arranged to conform with ISO Standard 3791 [7].
4.1.6 Audio frequencies interfaces
The following inputs and outputs applicable to the type of equipment shall be provided:
a) transmitters:
- SSB Telephony:
- 600 Ω earth free audio input;
- microphone input;
- DSC with analogue interfaces:
- 600 Ω earth free audio input;
- DSC with digital interfaces:
- NMEA 0183 Version 2.00 [6] input.
The logic level and the appropriate functions shall comply with NMEA 0183 Version 2.00 [6].
The B-state shall be logic "0", and the Y-state shall be logic "1".

Page 14
ETS 300 373: August 1995
b) receivers:
- SSB Telephony:
- 600 Ω earth free audio output;
- earphone output;
- speaker output;
- DSC with analogue interfaces:
- 600 Ω earth free audio output;
- DSC with digital interfaces:
- NMEA 0183, Version 2.00 [6] input.
The logic level and the appropriate functions shall comply with NMEA 0183 Version 2.00 [6].
The B-state shall be logic "0", and the Y-state shall be logic "1".
c) control(s):
- if a control interface is provided to
...