SIST EN 300 422-1 V1.3.2:2008

SLOVENSKI STANDARD
SIST EN 300 422-1 V1.3.2:2008
01-september-2008
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Electromagnetic compatibility and Radio spectrum Matters (ERM) - Wireless

microphones in the 25 MHz to 3 GHz frequency range - Part 1: Technical characteristics

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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Intellectual Property Rights................................................................................................................................6

Foreword.............................................................................................................................................................6

Introduction ........................................................................................................................................................7

1 Scope........................................................................................................................................................8

2 References................................................................................................................................................9

2.1 Normative references.........................................................................................................................................9

2.2 Informative references........................................................................................................................................9

3 Definitions, symbols and abbreviations .................................................................................................10

3.1 Definitions........................................................................................................................................................10

3.2 Symbols............................................................................................................................................................11

3.3 Abbreviations...................................................................................................................................................11

4 Functional characteristics.......................................................................................................................12

4.1 Radio microphone descriptions........................................................................................................................12

4.2 In ear monitoring..............................................................................................................................................12

4.3 Assistive Listening Devices (Aids for the handicapped)..................................................................................12

4.4 Tour Guide systems..........................................................................................................................................13

5 General...................................................................................................................................................13

5.1 Presentation of equipment for testing purposes................................................................................................13

5.1.1 Choice of model for testing ........................................................................................................................14

5.1.2 Definitions of alignment and switching ranges...........................................................................................14

5.1.3 Choice of frequencies.................................................................................................................................14

5.1.4 Testing of single channel equipment ..........................................................................................................14

5.1.5 Testing of two channel equipment..............................................................................................................14

5.1.6 Testing of multi-channel equipment (more than two channels)..................................................................14

5.1.7 Testing of equipment without a permanent external RF port......................................................................14

5.1.7.1 Equipment with a permanent internal RF port ......................................................................................15

5.1.7.2 Equipment with a temporary RF port....................................................................................................15

5.2 Mechanical and electrical design......................................................................................................................15

5.2.1 General........................................................................................................................................................15

5.2.2 Controls......................................................................................................................................................15

5.2.3 Performance testing with Integral antenna..................................................................................................15

5.2.4 Marking (equipment identification)............................................................................................................15

5.3 Interpretation of the measurement results ........................................................................................................15

6 Test conditions, power sources and ambient conditions ........................................................................16

6.1 Normal and extreme test-conditions.................................................................................................................16

6.2 Test power source.............................................................................................................................................16

6.3 Normal test conditions......................................................................................................................................16

6.3.1 Normal temperature and humidity..............................................................................................................16

6.3.2 Normal test power source voltage...............................................................................................................16

6.3.2.1 Mains voltage........................................................................................................................................16

6.3.2.2 Other power sources..............................................................................................................................17

6.4 Extreme test conditions ....................................................................................................................................17

6.4.1 Extreme temperatures.................................................................................................................................17

6.4.1.1 Procedures for tests at extreme temperatures ........................................................................................17

6.4.2 Extreme test power source voltages............................................................................................................17

6.4.2.1 Mains voltage........................................................................................................................................17

6.4.2.2 Other power sources..............................................................................................................................17

7 General conditions..................................................................................................................................17

7.1 Normal test modulation....................................................................................................................................17

7.1.1 Analogue systems.......................................................................................................................................17

7.1.2 Digital systems............................................................................................................................................18

7.2 Artificial antenna..............................................................................................................................................19

7.3 Test fixture.......................................................................................................................................................19

7.4 Test site and general arrangements for radiated measurements........................................................................19

7.5 Modes of operation of the transmitter ..............................................................................................................19

7.6 Arrangement for test signals at the input of the transmitter .............................................................................19

8 Methods of measurement and limits for transmitter parameters ............................................................20

8.1 Frequency stability ...........................................................................................................................................20

8.1.1 Method of measurement (analogue) ...........................................................................................................20

8.1.2 Method of measurement (digital)................................................................................................................20

8.1.3 Limit...........................................................................................................................................................20

8.2 Rated output power ..........................................................................................................................................20

8.2.1 Method of measurement for equipment without integral antenna ..............................................................20

8.2.2 Method of measurement for equipment with integral antenna....................................................................20

8.2.2.1 Method of measurement under normal test conditions .........................................................................20

8.2.3 Limit...........................................................................................................................................................21

8.3 Necessary bandwidth........................................................................................................................................21

8.3.1 Necessary Bandwidth (BN) for Analogue Systems ....................................................................................21

8.3.1.1 Method of Measurement .......................................................................................................................21

8.3.1.2 Limits....................................................................................................................................................22

8.3.2 Necessary Bandwidth (BN) for Digital Systems ........................................................................................22

8.3.2.1 Method of Measurement .......................................................................................................................22

8.3.2.2 Limits....................................................................................................................................................24

8.4 Spurious emissions...........................................................................................................................................25

8.4.1 Definition....................................................................................................................................................25

8.4.2 Method of measurement.............................................................................................................................25

8.4.3 Limits..........................................................................................................................................................26

8.4.4 Measuring receiver.....................................................................................................................................26

9 Receiver..................................................................................................................................................26

9.1 Spurious emissions...........................................................................................................................................26

9.1.1 Definitions..................................................................................................................................................26

9.1.2 Method of measuring the power level in a specified load...........................................................................26

9.1.3 Method of measuring the effective radiated power of the enclosure ..........................................................27

9.1.4 Method of measuring the effective radiated power.....................................................................................27

9.1.5 Limits..........................................................................................................................................................27

10 Measurement uncertainty .......................................................................................................................28

Annex A (normative): Radiated measurement..................................................................................29

A.1 Test sites and general arrangements for measurements involving the use of radiated fields .................29

A.1.1 Anechoic Chamber...........................................................................................................................................29

A.1.2 Anechoic Chamber with a conductive ground plane........................................................................................30

A.1.3 Open Area Test Site (OATS) ...........................................................................................................................31

A.1.4 Test antenna......................................................................................................................................................32

A.1.5 Substitution antenna.........................................................................................................................................32

A.1.6 Measuring antenna...........................................................................................................................................33

A.1.7 Stripline arrangement.......................................................................................................................................33

A.1.7.1 General........................................................................................................................................................33

A.1.7.2 Description..................................................................................................................................................33

A.1.7.3 Calibration..................................................................................................................................................33

A.1.7.4 Mode of use ................................................................................................................................................33

A.2 Guidance on the use of radiation test sites .............................................................................................33

A.2.1 Verification of the test site ...............................................................................................................................33

A.2.2 Preparation of the EUT.....................................................................................................................................33

A.2.3 Power supplies to the EUT...............................................................................................................................34

A.2.4 Volume control setting for analogue speech tests ............................................................................................34

A.2.5 Range length.....................................................................................................................................................34

A.2.6 Site preparation................................................................................................................................................35

A.3 Coupling of signals.................................................................................................................................35

A.3.1 General.............................................................................................................................................................35

A.3.2 Data Signals......................................................................................................................................................35

A.3.3 Speech and analogue signals ............................................................................................................................35

A.3.3.1 Acoustic coupler description.......................................................................................................................36

A.3.3.2 Calibration..................................................................................................................................................36

A.4 Standard test position .............................................................................................................................36

A.5 Test fixture.............................................................................................................................................37

A.5.1 Description.......................................................................................................................................................37

A.5.2 Calibration........................................................................................................................................................37

A.5.3 Mode of use......................................................................................................................................................38

Annex B (normative): Measurement of Necessary Bandwidth (BN) for analogue systems..........39

Annex C (informative): Bibliography...................................................................................................40

History ..............................................................................................................................................................41

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This European Standard (Telecommunications series) has been produced by ETSI Technical Committee

The present document has been updated in line with the advances in radio microphone technology in the digital field

and also with changes generated within CEPT in the former ERMES band for aids for the handicapped.

The present document is part 1 of a multi-part deliverable covering the Electromagnetic compatibility and Radio

spectrum Matters (ERM); Wireless microphones in the 25 MHz to 3 GHz frequency range, as identified below:

Part 2: "Harmonized EN covering essential requirements of article 3.2 of the R&TTE Directive".

In preparing the present document, much attention has been given to assure a low interference probability, while at the

Common technical specifications and harmonized frequency allocations are expected to greatly reduce problems of

The present document is a testing standard based on spectrum utilization parameters and does not include performance

characteristics that may be required by the user nor requirements for interfacing equipment.

In-ear monitoring systems may be tested to either the present document (< 200 kHz max. occupied bandwidth) or to

EN 301 357-1 [4] (< 300 kHz max. occupied bandwidth) with due consideration of power and operating frequency.

Consumer radio microphones with 300 kHz occupied bandwidth can also be tested to EN 301 357-1 [4].

Since the initial adoption of I-ETS 300 422 [5] there has been the introduction of further types of equipment into the

market - cordless headphones/loudspeakers Low power Band II and consumer in-ear monitoring. These are low power

wideband systems that have some characteristics in common with radio microphones but are not compatible with

Additional standards or specifications may be required for equipment intended to interface to the Public Switched

Telephone Network (PSTN). This facility may be subjected to regulatory conditions.

The present document covers the minimum characteristics considered necessary in order to make the best use of the

available frequency spectrum for wireless microphones. The present document specifies the minimum performance

requirements and the methods of measurement of Assistive Listening Devices, radio microphones and in-ear monitoring

systems. It does not necessarily include all the characteristics that may be required by a user, nor does it necessarily

The present document applies to equipment operating on radio frequencies between 25 MHz and 3 GHz (as shown in

table 1) using analogue, digital and hybrid (using both analogue and digital) modulation. The present document does not

apply to radio microphones or in ear monitoring equipment employing Time Division Multiple Access (TDMA)

The maximum power recommended for equipment covered by the present document is 250 mW (erp below 1 GHz and

The present document also covers radio microphones used in the 863 MHz to 865 MHz band, with a maximum power

Electromagnetic Compatibility (EMC) requirements are covered by EN 301 489-9 [7].

National regulations on maximum power output will apply or those detailed in the latest version of

- class 1 equipment would normally be considered as a category requiring an operator licence;

- class 2 equipment would be considered in some countries as not requiring an operator licence.

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