1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g5830 MHz Methods of measurement for DRM transmittersThe European Standard EN 62272-2:2007 has the sta
2、tus of a British StandardICS 33.060.20Digital radio mondiale (DRM) Part 2: Digital radio in the bands below BRITISH STANDARDBS EN 62272-2:2007BS EN 62272-2:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2007 BSI 2007ISBN 978 0 580
3、 50825 7Amendments issued since publicationAmd. No. Date Commentscontract. Users are responsible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard was published by BSI. It is the UK implementation of EN
4、 62272-2:2007. It is identical with IEC 62272-2:2007.The UK participation in its preparation was entrusted to Technical Committee EPL/103, Transmitting equipment for radio communication.A list of organizations represented on this committee can be obtained on request to its secretary.This publication
5、 does not purport to include all the necessary provisions of a EUROPEAN STANDARD EN 62272-2 NORME EUROPENNE EUROPISCHE NORM April 2007 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Cent
6、ral Secretariat: rue de Stassart 35, B - 1050 Brussels 2007 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 62272-2:2007 E ICS 33.060.20 English version Digital radio mondiale (DRM) - Part 2: Digital radio in the bands below 30 MH
7、z - Methods of measurement for DRM transmitters (IEC 62272-2:2007) Digital radio mondiale (DRM) - Partie 2: Radiodiffusion numrique dans les bandes de frquences en dessous de 30 MHz - Mthodes de mesure des metteurs DRM (CEI 62272-2:2007) Digital radio mondiale (DRM) - Teil 2: Digitaler Rundfunk in d
8、en Bndern unterhalb 30 MHz - Messverfahren fr DRM-Sender (IEC 62272-2:2007) This European Standard was approved by CENELEC on 2007-04-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a nat
9、ional standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exists in three official versions (English, French, German). A version
10、in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the C
11、zech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. EN 62272-2:2007 2 Foreword The text of
12、 document 103/64/FDIS, future edition 1 of IEC 62272-2, prepared by IEC TC 103, Transmitting equipment for radio communication, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 62272-2 on 2007-04-01. The following dates were fixed: latest date by which the EN has to b
13、e implemented at national level by publication of an identical national standard or by endorsement (dop) 2008-01-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2010-04-01 Annex ZA has been added by CENELEC. _ Endorsement notice The text of the Inter
14、national Standard IEC 62272-2:2007 was approved by CENELEC as a European Standard without any modification. _ 3 EN 62272-2:2007 CONTENTS 1 Scope 4 2 Normative references .4 3 Terms, definitions and abbreviations.5 3.1 Terms and definitions 5 3.2 Abbreviations 5 4 General conditions of operation 6 5
15、General conditions of measurement6 5.1 Input and output measurement arrangements 6 5.2 Temperature and humidity .7 5.3 Conditions for primary power supply 7 5.4 Output power.7 6 General characteristics.7 6.1 Output power.7 6.2 Frequency .8 7 Transmission performance characteristics 10 7.1 Spurious e
16、missions .10 7.2 Out-of-band emissions (spectrum mask) 11 7.3 Modulation error ratio (MER) .12 7.4 Bit error ratio (BER).12 8 Protection against atmospheric discharge.13 9 Acoustic noise14 10 Safety 14 Annex A (informative) Measuring arrangements .15 Annex B (informative) Out-of-band emission limits
17、 for DRM transmitters.17 Annex C (informative) Additional measuring details19 Annex ZA (normative) Normative references to international publications with their corresponding European publications .20 Figure 1 Spectrum occupancy for 9 kHz channels 9 Figure 2 Spectrum occupancy for 10 kHz channels 9
18、Figure 3 PRBS generator.13 Figure A.1 Arrangement A15 Figure A.2 Arrangement B15 Figure A.3 Arrangement C .16 Figure A.4 Arrangement D .16 Figure B.1 Out-of-band emission limits (upper half only of a symmetrical spectrum mask shown) 17 Table B.1 Out-of-band emission limits17 EN 62272-2:2007 4 DIGITA
19、L RADIO MONDIALE (DRM) Part 2: Digital radio in the bands below 30 MHz Methods of measurement for DRM transmitters 1 Scope This part of IEC 62272 describes the methods of measurement to assess the performance characteristics of digital modulated radio transmitters in the bands below 30 MHz for sound
20、 and/or data broadcasting in the LF, MF and HF bands, and to facilitate the comparison of measurements which are carried out by different personnel. It contains details of specially selected methods for determining the most important performance parameters of digital radio transmitters. The measurem
21、ent methods described apply to a limited number of performance parameters, i.e. those which can give rise to ambiguous interpretation due to the use of different methods and conditions. They are neither restrictive nor mandatory: measurements can be chosen for each particular case. The measurement m
22、ethods described in this standard are intended to be used for type approval tests, quality control tests or acceptance test measurements in factories and on site. Fewer or additional measurements may be carried out by agreement between customer and supplier. Any additional test should comply with st
23、andards which have been established by other study groups, subcommittees of the IEC or other international or suitably accredited organizations. This standard does not specify limiting values for acceptable performance as these are usually given in the equipment specification or in requirements laid
24、 down by the responsible regulation bodies. However, some values are quoted, where appropriate, for guidance in the presentation of the results. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition ci
25、ted applies. For undated references, the latest edition of the referenced document (including any amendments) applies. IEC 60244-1, Methods of measurement for radio transmitters Part 1: General characteristics for broadcast transmitters IEC 60244-15, Methods of measurement for radio transmitters Par
26、t 15: Amplitude-modulated transmitters for sound broadcasting IEC 60215, Safety requirements for radio transmitting equipment ITU Radio Regulations ITU-R Recommendation V.663, Use of certain terms linked with physical quantities 5 EN 62272-2:2007 _ 3 Terms, definitions and abbreviations 3.1 Terms an
27、d definitions For the purposes of this document, the following terms and definitions apply. 3.1.1 DRM standard digital modulation standard for frequencies in the bands below 30 MHz for the purposes of audio and data broadcasting 3.1.2 DRM transmitters sound broadcasting transmitters operating in the
28、 bands below 30 MHz and incorporating digital modulation in accordance with IEC 62272-113.1.3 power definitions nominal output power is the continuous DRM mean power for which the transmitter is designed maximum output power is the maximum possible continuous DRM mean power which the transmitter can
29、 deliver. The maximum output power might be concordant with the nominal output power minimum output power is the minimum possible continuous DRM mean power for which the transmitter is designed 3.1.4 necessary bandwidth for a given class of emission, the width of a frequency band which is just suffi
30、cient to ensure the transmission of information at the rate and with the quality required under specified conditions (ITU definition) For the practical purposes of this standard, the necessary bandwidth for a DRM signal can be considered to be the same as the allocated channel bandwidth, for example
31、, 10 kHz for a standard HF channel. 3.2 Abbreviations BER Bit Error Ratio BS Broadcasting Service DRM Digital Radio Mondiale FAC Fast Access Channel HF High Frequency IEC International Electrotechnical Commission ISO International Organization for Standardization ITU International Telecommunications
32、 Union ITU-R International Telecommunications Union Radiocommunications Sector LF Low Frequency MER Modulation Error Ratio MF Medium Frequency MLC Multi-Level Coding MSC Main Service Channel 1IEC 62272-1, Digital radio mondiale Part 1: System specification EN 62272-2:2007 6 OFDM Orthogonal Frequency
33、 Division Multiplex PRBS Pseudo-Random Bit Sequence QAM Quadrature Amplitude Modulation RF Radiofrequency SDC Service Description Channel SM Spectrum Management Tx Transmitter 4 General conditions of operation Any device for the suppression of unwanted signals, irrespective of whether or not the dev
34、ice is located inside the transmitter, shall be considered as part of the transmitter for the purposes of this standard. Feeders and antennas to which the transmitter might be connected are not considered part of the transmitter and therefore excluded. Unless otherwise specified, the measurements sh
35、all be made under normal operating and environmental conditions and at the nominal output power. If required, they shall be repeated under extreme operating and environmental conditions and at any lower output power in accordance with the equipment specification. The transmitting mode and the measur
36、ed output power of the transmitter under test shall be stated. The mains supply and the environmental conditions shall be stated with the measurement results. The transmitter shall be connected to a test load having a VSWR relative to the nominal load impedance of the transmitter not greater than 1,
37、2:1 at frequencies within the designated broadcast band; 1,5:1 at all frequencies outside the designated broadcast band up to a frequency of 10 times the highest frequency in the designated band. If the transmitter includes devices to control the frequency band transmitted, all the characteristics s
38、hall be measured with the devices in the circuit. Measurement uncertainty should be calculated and techniques employed to minimize its range. This uncertainty should be applied to the limit and any measurement falling below the range is deemed acceptable. If a digital transmitter can also operate in
39、 analogue mode, the requirements of IEC 60244-1 and IEC 60244-15 shall also apply, in addition to the requirements of this standard. 5 General conditions of measurement 5.1 Input and output measurement arrangements For the purposes of measurement, the input and output signal arrangements are given i
40、n the form of diagrams. Where required, the impedance of the test equipment of the transmitter under test and of all the connections between them shall be appropriately terminated, taking into account the transmitters specification and the termination impedance of any test equipment. 7 EN 62272-2:20
41、07 These test procedures for DRM transmitters require that the test signals used shall conform to the DRM standard and that the measuring equipment is sufficiently accurate and has the necessary performance and dynamic range to provide error-free measurements of transmitter performance parameters. 5
42、.2 Temperature and humidity Equipment to be measured shall be operated in an environment which meets the temperature and humidity requirements as defined in their technical specifications. Temperature and humidity must never be such as to cause condensation in or on the equipment during measurements
43、. In the absence of temperature and humidity requirements in the technical specifications, the provisions of IEC 60244-1 shall apply. 5.3 Conditions for primary power supply The measurements are carried out at the nominal voltage and the nominal frequency of the power supply given in the relevant eq
44、uipment specification. During a series of measurements carried out as part of one test on one equipment, the voltage and frequency of the power supply shall be set at the nominal values indicated in the equipment specification. If called for in the specification and if the power source is able to be
45、 adjusted, the test shall be repeated at the extremes of voltage and frequency stipulated in the specification. The conditions for primary power voltage and frequency shall be specified in the equipment specification. If no voltage or frequency range is specified, the tests shall be carried out with
46、 voltage within 5 % of nominal and frequency within 2 % of nominal. 5.4 Output power The tests shall be carried out with the transmitter set to its nominal output power and, if required, also at any other output power within the equipment specification. 6 General characteristics 6.1 Output power 6.1
47、.1 Definition For a digital signal with the OFDM modulation process the power is distributed evenly throughout the transmission channel. Hence, when taking power measurements on such a signal, the total bandwidth occupied by the modulated signal shall be taken into account. The output power of a dig
48、ital modulated transmitter is defined as the mean power (thermal power) delivered at its output port, measured during an interval of time sufficiently long compared with the lowest frequency encountered in the modulation envelope, taken under normal operating condition (continuous mean power). 6.1.2
49、 Measuring arrangement Figure A.1 shows the measuring set-up to be used. In general, quantifying output power relies on measuring either the thermal effects of the power dissipated in the test load or the RF voltage across it. The method chosen will depend largely on power output. Examples are as follows: EN 62272-2:2007 8 a) calorimetric methods; b) temperature-dependent component; c) RF power meter with thermal probe and directional coupler
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