SIST ETS 300 279:1999
(Main)Radio Equipment and Systems (RES); ElectroMagnetic Compatibility (EMC) standard for Private land Mobile Radio (PMR) and ancillary equipment (speech and/or non-speech)
- Abstract
Covers the EMC requirements for private mobile radio equipment. (Analogue, speech/non-speech) The ETS may be used to demonstrate compliance with the requirements of the EMC Directive 89/336/EEC.
- Status
- Published
- Publication Date
- 31-May-1999
- Technical Committee
- RES - Radio equipment and systems
- Current Stage
- 6060 - National Implementation/Publication (Adopted Project)
- Start Date
- 01-Jun-1999
- Due Date
- 01-Jun-1999
- Completion Date
- 01-Jun-1999
SIST ETS 300 279:1999 is the Slovene adoption of ETS 300 279 Edition 1 from ETSI. It sets ElectroMagnetic Compatibility (EMC) requirements, test methods, limits, and minimum performance criteria for Private land Mobile Radio (PMR) equipment and associated ancillary equipment, including speech and non-speech equipment. It is written for equipment assessed for fixed, mobile, portable, and vehicular use, and it may be used to demonstrate compliance with EMC Directive 89/336/EEC.
What does SIST ETS 300 279:1999 specify?
SIST ETS 300 279:1999 specifies how to assess PMR equipment and its ancillary equipment for EMC. It covers the tests to run, the methods to use, the limits to apply, and the minimum performance criteria that the equipment must meet during and after testing.
The standard applies to PMR equipment operating in the 30-1000 MHz range and to associated ancillary equipment. Its EMC levels are aimed at residential, commercial, light industrial, and vehicular environments, which matters in practice because the document is designed for everyday operating conditions rather than rare severe interference cases.
The document is organized into the following main clauses:
| Clause | Content |
|---|---|
| 1 | Scope |
| 2 | Normative references |
| 3 | Definitions |
| 4 | General test conditions |
| 5 | Performance assessment |
| 6 | Performance criteria |
| 7 | Applicability overview tables |
| 8 | Test methods and limits for emission tests |
| 9 | Test methods and levels for immunity tests |
| History | Document history |
The scope also notes that antenna-port specifications and enclosure-port emission requirements for radio equipment are handled in related product standards for spectrum use.
What are the key requirements of SIST ETS 300 279:1999?
SIST ETS 300 279:1999 is built around a practical EMC test setup: test the equipment in a normal operating-like configuration, apply the disturbance specified for each port, and judge the result by defined communication and functional criteria. That matters because compliance depends not only on measured emissions, but also on whether the radio still works as intended during disturbance.
Test setup and reporting
Clause 4 requires testing within the manufacturer’s declared humidity, temperature, and supply-voltage range. The equipment should be configured as close as possible to normal intended use, with detachable integral antennas fitted in a typical way and only the minimum ancillary equipment connected when needed to exercise ports.
Clause 4 also requires the test conditions, configuration, and operating mode to be recorded in the test report. The manufacturer must supply information for performance assessment in Clause 5, including primary functions, intended functions, modulation or message format, ancillary equipment used for the test, a full port list with allowed cable lengths, and the bandwidth of the IF filter immediately before the demodulator.
How emission and immunity tests are run
Clause 4.1 says emission testing should use the operating mode that produces the largest emission in the band being investigated. Clause 4.1.2 says immunity testing should be performed with a maintained communication link where that is possible.
For transmitters, the equipment is operated at maximum rated output power with normal test modulation. For receivers, the wanted input signal is modulated with normal test modulation. Duplex transceivers may be configured in repeater mode when that matches the test arrangement.
The clause also defines how to treat exclusion bands and narrow-band responses. Receiver and transceiver exclusion bands are based on the declared switching range, transmitter exclusion bands extend around the nominal operating frequency, and narrow-band responses that behave like spurious responses are disregarded. In practice, this prevents a spurious tuned response from being treated as a true EMC failure.
Performance criteria
Clause 6 defines separate performance criteria for continuous and transient phenomena on transmitters and receivers:
- CT and TT apply to transmitters
- CR and TR apply to receivers
- the same criteria are applied to transceivers as appropriate
Speech and non-speech equipment are treated differently, and transmitter-only equipment is also checked in standby to confirm that it does not transmit unintentionally. For specialised equipment, the manufacturer may declare a substitute performance specification, but that specification must be included in the test report and product documentation.
Applicability of the test matrix
Clause 7 gives overview tables that show which tests apply to base station, mobile, portable, and ancillary equipment, and whether the use is fixed, vehicular, or portable. This is important for selecting the right test plan before going to the lab.
The emission tests in Clause 8 cover:
- enclosure emissions from ancillary equipment
- dc power input/output port emissions
- ac mains power input/output port emissions
The immunity tests in Clause 9 cover:
- radio frequency electromagnetic field
- electrostatic discharge
- fast transients
- RF common mode disturbances
- vehicular transients and surges
- voltage dips and interruptions
- surges on ac mains ports
Special cases that affect compliance decisions
Clause 5 allows ancillary equipment to be assessed in isolation, with the associated radio equipment, or against another appropriate harmonised EMC standard. Clause 5 also explains that portable equipment powered from a vehicle battery is treated as vehicular mobile equipment, while portable or mobile equipment powered from ac mains is treated as base station equipment for the applicable requirements.
Clause 9 includes reporting rules when certain ports are not tested because the manufacturer declares that long cables are not intended. It also requires recording any loss of communication link or user data where that can occur under mains interruption or battery-backup conditions.
What terms does SIST ETS 300 279:1999 define?
- Radiocommunications equipment - equipment with one or more transmitters and/or receivers, used in fixed, mobile, or portable applications.
- Ancillary equipment - equipment used with a receiver, transmitter, or transceiver to add operational or control features, but not able to provide user functions on its own.
- Port - a specific interface between the equipment and the external electromagnetic environment.
- Enclosure port - the physical boundary of the apparatus where electromagnetic fields may radiate to or impinge on the equipment.
- Integral antenna - an antenna built into the equipment or directly connected to it, with or without an external connector.
- Switching range - the full frequency range over which a receiver can operate without reprogramming or realignment.
Who uses SIST ETS 300 279:1999?
SIST ETS 300 279:1999 is used by PMR equipment manufacturers, ancillary equipment suppliers, EMC test laboratories, and conformity assessment engineers. It is also used by quality and regulatory staff who need to define the test plan, document the test setup, and evaluate pass/fail results for radio equipment intended for fixed, portable, mobile, or vehicular use.
In practice, it supports design verification, type testing, product release decisions, and preparation of EMC test reports. Buyers and integrators use it to understand what EMC evidence a PMR product should provide before deployment.
What changed in SIST ETS 300 279:1999 from the previous edition?
SIST ETS 300 279:1999 corresponds to ETS 300 279 Edition 1.
Which standards are used with SIST ETS 300 279:1999?
The document cites these normative references and companion standards:
| Standard | What it contributes |
|---|---|
| EN 50081-1 | Generic emission standard for residential, commercial, and light industry environments |
| EN 50082-1 | Generic immunity standard for residential, commercial, and light industry environments |
| EN 55022 | Emission measurement methods and limits used for enclosure, dc, and ac mains tests |
| CISPR Publication No. 16-1 | Measuring apparatus and methods, including LISN requirements |
| ENV 50140 | Radiated RF field immunity method |
| IEC 801-2 | Electrostatic discharge requirements |
| IEC 801-4 | Electrical fast transient and burst requirements |
| ENV 50141 | Conducted RF immunity by current clamp injection |
| IEC 1000-4-11 | Voltage dips, short interruptions, and voltage variations |
| IEC 1000-4-5 | Surge immunity requirements |
| ISO 7637 Parts 1 and 2 | Vehicular electrical disturbances for 12 V and 24 V systems |
The foreword also states that the ETS is based on EN 50081-1 and EN 50082-1, with other standards used where appropriate.
What does the SIST ETS 300 279:1999 document contain?
The document contains the full EMC test framework for PMR equipment: scope, definitions, setup rules, performance assessment rules, and performance criteria. It also contains applicability overview tables that show which tests apply to each equipment class and operating environment.
Clause 8 gives emission test methods and limits for ancillary equipment enclosures, dc ports, and ac mains ports. Clause 9 gives the immunity test methods and levels for radiated fields, ESD, fast transients, RF common mode disturbance, vehicular transients and surges, voltage dips and interruptions, and mains surges.
It also sets out the practical details needed for laboratory work, such as modulation conditions, communication-link setup, handling of receiver exclusion bands, treatment of narrow-band responses, use of LISNs, and the special reporting needed when a port is not tested or when the link or stored data is lost during mains disturbance.
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Frequently Asked Questions
SIST ETS 300 279:1999 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Radio Equipment and Systems (RES); ElectroMagnetic Compatibility (EMC) standard for Private land Mobile Radio (PMR) and ancillary equipment (speech and/or non-speech)". This standard covers: Covers the EMC requirements for private mobile radio equipment. (Analogue, speech/non-speech) The ETS may be used to demonstrate compliance with the requirements of the EMC Directive 89/336/EEC.
Covers the EMC requirements for private mobile radio equipment. (Analogue, speech/non-speech) The ETS may be used to demonstrate compliance with the requirements of the EMC Directive 89/336/EEC.
SIST ETS 300 279:1999 is classified under the following ICS (International Classification for Standards) categories: 33.060.99 - Other equipment for radiocommunications; 33.100.20 - Immunity. The ICS classification helps identify the subject area and facilitates finding related standards.
SIST ETS 300 279:1999 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-1999
Radijska oprema in sistemi (RES) - Standard elektromagnetne združljivosti (EMC)
za zasebni mobilni radio (PMR) in pomožno opremo (govorno oziroma negovorno)
Radio Equipment and Systems (RES); ElectroMagnetic Compatibility (EMC) standard for
Private land Mobile Radio (PMR) and ancillary equipment (speech and/or non-speech)
Ta slovenski standard je istoveten z: ETS 300 279 Edition 1
ICS:
33.060.99 Druga oprema za radijske Other equipment for
komunikacije radiocommunications
33.100.20 Imunost Immunity
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN ETS 300 279
TELECOMMUNICATION February 1996
STANDARD
Source: ETSI TC-RES Reference: DE/RES-09002
ICS: 33.100, 30.060.20, 30.060.50
EMC, mobile, PMR, radio
Key words:
Radio Equipment and Systems (RES);
ElectoMagnetic Compatibility (EMC) standard for Private
land Mobile Radio (PMR) and ancillary equipment
(speech and/or non-speech)
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 1996. All rights reserved.
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ETS 300 279: February 1996
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 300 279: February 1996
Contents
Foreword .5
1 Scope .7
2 Normative references.7
3 Definitions.8
4 General test conditions.8
4.1 Test conditions and configurations .8
4.1.1 Emission tests .9
4.1.2 Immunity tests .9
4.1.2.1 Mode of operation.9
4.1.2.2 Normal test modulation.9
4.1.2.3 Arrangements for test signals at the input of the
transmitter.10
4.1.2.4 Arrangements for test signals at the output of the
transmitter.10
4.1.2.5 Arrangements for test signals at the input of the receiver .10
4.1.2.6 Arrangements for test signals at the output of the receiver.11
4.1.2.7 Receiver and receivers of transceivers exclusion band .11
4.1.2.8 Transmitter exclusion band .11
4.1.2.9 Narrow band responses on receivers and receivers of
transceivers .11
5 Performance assessment .12
5.1 General .12
5.2 Equipment which can provide a communications link .12
5.3 Equipment which does not provide a communications link .12
5.4 Ancillary equipment.12
5.5 Equipment classification .12
6 Performance criteria.13
6.1 General .13
6.2 Performance criteria for Continuous phenomena applied to Transmitters (CT).13
6.3 Performance criteria for Transient phenomena applied to Transmitters (TT) .13
6.4 Performance criteria for Continuous phenomena applied to Receivers (CR).13
6.5 Performance criteria for Transient phenomena applied to Receivers (TR) .14
7 Applicability overview tables.14
7.1 Emission .14
7.2 Immunity .15
8 Test methods and limits for emission tests.15
8.1 Enclosure of ancillary equipment.15
8.1.1 Definition .15
8.1.2 Test method .15
8.1.3 Limits.15
8.2 DC power input/output port.16
8.2.1 Definition .16
8.2.2 Test method .16
8.2.3 Limits.16
8.3 AC mains power input/output port.17
8.3.1 Definition .17
8.3.2 Test method .17
8.3.3 Limits.17
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ETS 300 279: February 1996
9 Test methods and levels for immunity tests . 17
9.1 Radio frequency electromagnetic field (80-1000 MHz) . 17
9.1.1 Definition. 17
9.1.2 Test method. 17
9.1.3 Performance criteria . 18
9.2 Electrostatic discharge . 18
9.2.1 Definition. 18
9.2.2 Test method. 18
9.2.3 Performance criteria . 18
9.3 Fast transients common mode. 19
9.3.1 Definition. 19
9.3.2 Test method. 19
9.3.3 Performance criteria . 19
9.4 RF common mode, 0,15 MHz - 80 MHz (current clamp injection). 19
9.4.1 Definition. 20
9.4.2 Test method. 20
9.4.3 Performance criteria . 20
9.5 Transients and surges, vehicular environment . 20
9.5.1 Definition. 21
9.5.2 Test method. 21
9.5.2.1 Requirements for 12 V dc powered equipment. 21
9.5.2.2 Requirements for 24 V dc powered equipment. 21
9.5.3 Performance criteria . 22
9.6 Voltage dips and interruptions. 22
9.6.1 Definition. 22
9.6.2 Test method. 22
9.6.3 Performance criteria . 22
9.7 Surges common and differential mode . 23
9.7.1 Definition. 23
9.7.2 Test method. 23
9.7.3 Performance criteria . 23
History. 24
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ETS 300 279: February 1996
Foreword
This (ETS) has been produced by the Radio Equipment and Systems (RES) Technical Committee of the
European Telecommunications Standards Institute (ETSI).
Other ETSs cover radiocommunications equipment not listed in the scope.
This ETS is based upon Generic Standards EN 50081-1 [1] and EN 50082-1 [2] and other standards
where appropriate.
Transposition dates
Date of adoption of this ETS: 22 December 1995
Date of latest announcement of this ETS (doa): 31 May 1996
Date of latest publication of new National Standard
or endorsement of this ETS (dop/e): 30 November 1996
Date of withdrawal of any conflicting National Standard (dow): 30 November 1996
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ETS 300 279: February 1996
Blank page
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ETS 300 279: February 1996
1 Scope
This ETS covers the assessment of radiocommunications and ancillary equipment in respect of
ElectroMagnetic Compatibility (EMC). Technical specifications related to the antenna port and emissions
for the enclosure port of radio equipment are found in the related product standards for the effective use
of the radio spectrum.
This ETS specifies the applicable EMC tests, the test methods, the limits and the minimum performance
criteria for Private land Mobile Radio (PMR) equipment (speech and/or non-speech) operating in the
frequency range 30 - 1000 MHz, and the associated ancillary equipment.
The environmental classification used in this ETS refers to the environment classification used in the
Generic Standards EN 50081-1 [1], EN 50082-1 [2], except for the vehicular environment class which
refers to ISO 7637 [11].
The EMC requirements have been selected to ensure an adequate level of compatibility for apparatus at
residential, commercial, light industrial and vehicular environments. The levels do not cover extreme
cases which may occur in any location but have a low probability of occurrence.
This ETS may not cover those cases where a potential source of interference which is producing
individually repeated transient phenomena or a continuous phenomena is permanently present, e.g. a
radar or broadcast site in the near vicinity. In such a case it may be necessary to use special protection
applied to either the source of interference or the interfered part or both.
Compliance of radio equipment to the requirements of this ETS does not signify compliance to any
requirements related to the use of the equipment (i.e. licensing requirements).
Compliance to this ETS does not signify compliance to any safety requirements. However, it is the
responsibility of the assessor of the equipment that any observations regarding apparatus becoming
dangerous or unsafe as a result of the application of the tests of this ETS, should be recorded in the test
report.
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 relate to the publications listed
hereafter. For dated references, subsequent amendments 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] EN 50081-1 (1992): "Electromagnetic compatibility - generic emission standard.
Part 1: Residential, commercial and light industry".
[2] EN 50082-1 (1992): "Electromagnetic compatibility - generic immunity standard.
Part 1: Residential, commercial and light industry".
[3] EN 55022 (1994): "Limits and methods of measurement of radio interference
characteristics of information technology equipment".
[4] CISPR Publication No. 16-1: "Specification for radio disturbance and immunity
measuring apparatus and methods".
[5] ENV 50140: "Basic immunity standard - Radiated, radio frequency,
electromagnetic fields".
[6] IEC 801-2 (second edition 1991); Part 2: "Electrostatic discharge requirement".
[7] IEC 801-4 (1988); Part 4: "Electrical fast transients / burst requirements".
[8] ENV 50141: "Basic immunity standard - Conducted disturbances induced by
radio-frequency fields".
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ETS 300 279: February 1996
[9] IEC 1000-4-11: "Voltage dips, short interruptions and voltage variations.
Immunity tests".
[10] IEC 1000-4-5: "Surge immunity requirements".
[11] ISO 7637 (1990): "Road vehicles-Electrical disturbance by conducting and
coupling; Part 1: Passenger cars and light commercial vehicles with nominal
12 V supply voltage"; and "Part 2: Commercial vehicles with nominal 24 V
supply voltage - Electrical transient conduction along supply lines only".
3 Definitions
For the purposes of this ETS, the following definitions apply:
radiocommunications equipment: An apparatus which includes one or more transmitters and/or
receivers and/or parts thereof.
This type of equipment (apparatus) is used in a fixed, mobile or a portable application.
ancillary equipment: Equipment (apparatus), used in connection with a receiver, transmitter or
transceiver is considered as an ancillary equipment (apparatus) if:
- the equipment is intended for use in conjunction with a receiver, transmitter or transceiver to
provide additional operational and/or control features to the radio equipment (e.g. to extend control
to another position or location); and
- the equipment cannot be used on a stand alone basis to provide user functions independently of a
receiver, transmitter or transceiver; and
- the receiver, transmitter or transceiver to which it is connected, is capable of providing some
intended operation such as transmitting and/or receiving without the ancillary equipment, i.e. it is not
a sub-unit of the main equipment essential to the main equipment basic functions.
port: A particular interface of the specified equipment (apparatus) with the external electromagnetic
environment.
enclosure port: The physical boundary of the apparatus onto which an electromagnetic field may radiate
or impinge.
integral antenna: An antenna designed to be connected directly to the equipment with or without the use
of an external connector and considered to be part of the equipment. An integral antenna may be fitted
internally or externally to the equipment.
4 General test conditions
This clause defines the general test configuration and is relevant for clauses 8 and 9.
4.1 Test conditions and configurations
The equipment shall be tested under conditions which are within the manufacturer's declared range of
humidity, temperature and supply voltage.
The test configuration shall be as close to normal intended use as possible.
Where portable (handheld) equipment is provided with a detachable integral antenna, it shall be tested
with the antenna fitted in a manner typical of normal intended use, unless specified otherwise.
If the equipment is part of a system, or can be connected to ancillary equipment, then it shall be
acceptable to test the equipment while connected to the minimum configuration of ancillary equipment
necessary to exercise the ports.
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ETS 300 279: February 1996
Ports which in normal operation are connected shall be connected to an ancillary equipment or to a
representative piece of cable correctly terminated to simulate the impedance of the ancillary equipment,
RF input/output ports shall be correctly terminated.
If the equipment has a large number of ports, then a sufficient number shall be selected to simulate actual
operation conditions and to ensure that all the different types of termination are tested.
Ports which are not connected to cables during normal intended operation, e.g. service connectors,
programming connectors, temporary connectors etc. shall not be connected to any cables for the purpose
of EMC testing. Where cables have to be connected to these ports, or interconnecting cables have to be
extended in length in order to exercise the EUT, precautions shall be taken to ensure that the evaluation
of the EUT is not affected by the addition or extension of these cables.
The tests shall be carried out at a point within the specified normal operating environmental range at the
rated supply voltage for the equipment.
The test conditions, test configuration and mode of operation shall be recorded in the test report.
4.1.1 Emission tests
This subclause defines the test conditions and configurations for the emission tests as follows:
- the measurement shall be made in the operation mode producing the largest emission in the
frequency band being investigated consistent with normal applications;
- an attempt shall be made to maximise the detected radiated emission for example by moving the
cables of the equipment.
4.1.2 Immunity tests
This subclause defines the test conditions and configurations for the immunity tests as follows:
- the measurement shall be made in the mode of operation as required in subclause 4.1.2.1;
- for the immunity tests of ancillary equipment without separate pass/fail criteria, the receiver,
transmitter or transceiver coupled to the ancillary equipment, shall be used to judge whether the
ancillary equipment passes or fails.
4.1.2.1 Mode of operation
For the immunity tests of transmitters, the transmitter shall be operated at its maximum rated output
power, modulated with normal test modulation (subclauses 4.1.2.2 and 4.1.2.3). A communication link
shall be established (subclause 4.1.2.4) at the start of the test and maintained during the test.
For the immunity tests of receivers, the wanted input signal, coupled to the receiver, shall be modulated
with normal test modulation (subclauses 4.1.2.2 and 4.1.2.5). A communication link shall be established
(subclause 4.1.2.6) at the start of the test and maintained during the test.
For the immunity tests of duplex transceivers, the EUT may be configured in the repeater mode,
consistent with the conditions given above.
4.1.2.2 Normal test modulation
For analogue speech equipment:
- the receiver wanted input signal shall be set to the nominal frequency of the receiver modulated
with a sinusoidal audio frequency of 1 000 Hz to a deviation of 60 % peak system deviation for
angle modulated equipment;
- the transmitter of the EUT shall be modulated with a sinusoidal audio frequency of 1 000 Hz at a
deviation of 60 % peak system deviation for angle modulated equipment.
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ETS 300 279: February 1996
For digital speech equipment:
- the receiver wanted input signal shall be set to the nominal frequency of the receiver modulated
with a test signal specified by the manufacturer which represents normal operation;
- the transmitter shall be modulated with a test signal which represents normal operation as specified
by the manufacturer;
- the manufacturer may have to supply the test modulation/de-modulation equipment.
For non-speech equipment (data, specific response, etc.):
- the receiver wanted input signal shall be set to the nominal frequency of the receiver modulated
with a test signal specified by the manufacturer which represents normal operation;
- the transmitter shall be modulated with a test signal which represents normal operation as specified
by the manufacturer;
- the manufacturer may have to supply the test modulation/de-modulation equipment.
The test signal generator (modulation) shall be able to produce a continuous stream of data or a repetitive
message.
The test signal receiver (de-modulator) shall be able to produce a readout of Bit Error Ratio (BER) of a
continuous data stream or a repetitive readout of message acceptance.
4.1.2.3 Arrangements for test signals at the input of the transmitter
The transmitter should be modulated with normal test modulation, by an internal or external signal source
capable of delivering the normal test modulation.
4.1.2.4 Arrangements for test signals at the output of the transmitter
For equipment without an antenna connector, the wanted signal to establish a communication link shall be
delivered from the equipment to an antenna located within the test environment. The measuring
equipment for the wanted signal shall be located outside of the test environment. Adequate measures
shall be taken to avoid the effect of the unwanted signal on the measuring equipment
For equipment with an antenna connector, the wanted signal to establish a communication link shall be
delivered from the antenna connector by a coaxial cable. The measuring equipment for the wanted signal
shall be located outside of the test environment. Adequate measures shall be taken to avoid the effect of
the unwanted signal on the measuring equipment.
4.1.2.5 Arrangements for test signals at the input of the receiver
For equipment without an antenna connector, the wanted input signal to establish a communication link
shall be presented to the equipment from an antenna located within the test environment. It shall be
approximately 40 dB above the minimum level necessary to achieve the performance criteria, measured
while the power amplifiers generating the EMC disturbance are switched on but without excitation. This
level of the wanted input signal is expected to represent a normal operation signal level and should be
sufficient to avoid the broad band noise from the power amplifiers generating the EMC disturbance from
influencing the measurement. The source of the wanted input signal shall be located outside of the test
environment.
For equipment with an antenna connector, the wanted input signal to establish a communication link shall
be presented to the antenna connector by a coaxial cable. The source of the wanted input signal shall be
located outside of the test environment and shall be approximately 40 dB above the minimum level
necessary to achieve the performance criteria, measured while the power amplifiers generating the EMC
disturbance are switched on but without excitation.
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ETS 300 279: February 1996
4.1.2.6 Arrangements for test signals at the output of the receiver
For speech equipment the audio frequency output of the equipment should be coupled via an electrically
non-conductive acoustic tube to an audio distortion meter or other measuring equipment outside of the
test environment. Where it is not practical to use an electrically non-conductive acoustic tube, then other
means of connecting the receiver output to an audio distortion meter or other measuring equipment shall
be provided and recorded in the test report. Precautions shall be taken to ensure that any effect on the
test is minimised.
For non-speech equipment the output of the receiver shall be coupled via an electrically non-conductive
means to the test equipment outside the test environment. If the equipment has an output connector or
port providing the receiver output then this port shall be used via a cable, consistent with the standard
cable used in normal operation, connected to the test equipment outside the test environment. The test
equipment may be supplied by the manufacturer. Precautions shall be taken to ensure that any effect on
the test is minimised.
4.1.2.7 Receiver and receivers of transceivers exclusion band
The exclusion band for receivers and receivers of transceivers is the frequency range determined by the
switching range, as declared by the manufacturer, extended as follows:
- the lower frequency of the exclusion band is the lower frequency of the switching range, minus 5 %
of the centre frequency of the switching range, or minus 10 MHz, whichever will result in the lowest
frequency;
- the upper frequency of the exclusion band is the upper frequency of the switching range, plus 5 %
of the centre frequency of the switching range, or plus 10 MHz, which ever will result in the highest
frequency.
The switching range is the maximum frequency range over which the receiver can be operated without
reprogramming or realignment.
4.1.2.8 Transmitter exclusion band
The exclusion band for transmitters extends ± 25 kHz from the nominal operating frequency of the
transmitter.
4.1.2.9 Narrow band responses on receivers and receivers of transceivers
Responses on receivers or receivers of transceivers occurring during the test at discrete frequencies
which are narrow band responses (spurious responses) are identified by the following method.
If during the test an unwanted signal creates a degradation of the audio or data output, it is necessary to
establish whether the degradation is due to a narrow band response or to a wide band phenomena.
Therefore, the unwanted signal frequency is increased by an amount equal to twice the bandwidth of the
receiver IF filter immediately preceding the demodulator, as declared by the manufacturer. The test is
repeated with the frequency of the unwanted signal decreased by the same amount.
If the degradation disappears, then the response is considered as a narrow band response. If the
degradation remains, this may be due to the fact that the offset has made the frequency of the unwanted
signal correspond to the frequency of another narrow band response. Under these circumstances the
procedure is repeated with the increase and decrease of the frequency of the unwanted signal adjusted
two and one half times the bandwidth previously referred to.
If the degradation remains, the phenomena is considered wide band and therefore an EMC problem and
the equipment fails the test.
Narrow band responses shall be disregarded.
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ETS 300 279: February 1996
5 Performance assessment
5.1 General
The manufacturer shall at the time of submission of the equipment for test, supply the following
information to be recorded in the test report:
- the primary functions of the radio equipment to be tested during and after the EMC testing;
- the intended functions of the radio equipment which shall be in accordance with the documentation
accompanying the equipment;
- the type of modulation, the characteristics of the transmission used for testing (random bit stream,
message format, etc.) and the necessary test equipment delivered to enable the assessment of the
EUT;
- the ancillary equipment to be combined with the radio equipment for testing (where applicable);
- an exhaustive list of ports, with the maximum cable lengths allowed, classified as either power or
signal/control. Power ports shall further be classified as ac or dc power;
- the bandwidth of the IF filter immediately preceeding the demodulator.
5.2 Equipment which can provide a communications link
The test arrangement and signals, given in clause 4, apply to radio equipment or a combination of a radio
equipment and ancillary equipment which permits the establishment of a communications link.
5.3 Equipment which does not provide a communications link
If the equipment is of a specialised nature (see subclause 6.1) which does not permit a communications
link to be establi
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