BS EN 60244-13-1993 Methods of measurement for radio transmitters - Performance characteristics for FM sound broadcasting《无线电发射机测量方法 第13部分 调频广播特性》.pdf

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1、BRITISH STANDARD BS EN 60244-13:1993 IEC 244-13: 1991 Methods of measurement for radio transmitters Part 13: Performance characteristics for FM sound broadcasting The European Standard EN60244-13:1993 has the status of a British Standard UDC 621.396.61:621.396.93:620.1.083:621.317.083BSEN60244-13:19

2、93 This British Standard, having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15December1993 BSI 09-1999 The following BSI references relate to the work on this standard: Com

3、mittee reference EEL/25 Special announcement in BSINews, September1993 ISBN 0 580 22647 6 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following c

4、ountries: Austria Italy Belgium Luxembourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN60244-13:1993 BSI 09-1999 i Contents Page Cooperating organizations Insid

5、e front cover National foreword ii Foreword 2 Text of EN60244-13 3 National annex NA (informative) Committees responsible Inside back cover National annex NB (informative) Cross-references Inside back coverBSEN60244-13:1993 ii BSI 09-1999 National foreword This British Standard has been prepared und

6、er the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN60244-13:1993, Methods of measurement for radio transmitters Part13:Performance characteristics for FM sound broadcasting, published by the European Committee for Electrotechnical Standar

7、dization (CENELEC). It is identical with IEC244-13:1991, published by the International Electrotechnical Commission (IEC) and is part of a multi-part series describing recommended methods of measurement for assessing the performance of radio transmitters. This Part of BS EN60244 covers the method of

8、 measurement to assess the performance characteristics of frequency modulated transmitters for sound broadcasting and is intended to be used for type tests and acceptance or factory tests. It is also intended to be used in conjunction with Parts1 and 12-1 and 12-2 1)of EN60244, as well as with the C

9、CIR Recommendations and Reports listed. It is anticipated that the other Parts of IEC Publication244 will be published as identical British Standards, subject to their harmonization by CENELEC. For ease of publication, some of the figures also include the French text. A British Standard does not pur

10、port to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front

11、cover, pagesi and ii, theEN title page, pages2 to22, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. 1) In preparation. It is envisaged that i

12、dentical British Standards, designated BS EN60244-1, BSEN60244-12-1 and BS EN60244-12-2, will be published in due course.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60244-13 April 1993 UDC 621.396.61:621.396.93:620.1.083:621.317.083 Descriptors: Radio equipment, transmitter, sound broadcast

13、ing, frequency modulation, operating characteristics, quality English version Methods of measurement for radio transmitters Part13:Performance characteristics for FM sound broadcasting (IEC 244-13:1991) Mthodes de mesure applicables aux metteurs radiolectriques Partie13: Qualits de fonctionnement de

14、s metteurs de radiodiffusion sonore modulation de frquence (CEI244-13:1991) Meverfahren fr Funksender Teil13: bertragungseigenschaften fr FM-Tonrundfunk (IEC244-13:1991) This European Standard was approved by CENELEC on1993-03-09. CENELEC members are bound to comply with the CEN/CENELEC Internal Reg

15、ulations which stipulate the conditions for giving this European Standard the status of a national 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. T

16、his European Standard exists in three official versions (English, French, German). A version 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 memb

17、ers are the national electrotechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Eur

18、open de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN60244-13:1993 EEN60244-13:1993 BSI 09-1999 2 Foreword The CENELEC questionnaire procedure, performed

19、for finding out whether or not the International Standard IEC244-13:1991 could be accepted without textual changes, has shown that no common modifications were necessary for the acceptance as European Standard. The reference document was submitted to the CENELEC members for formal vote and was appro

20、ved by CENELEC as EN60244-13 on9March1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex A, Annex B and Annex ZA are normative. Contents Page Foreword 2 Introduction 3 1 Scope 3 2 Normative references 3 3 General terms an

21、d definitions 3 4 General conditions of operation 4 5 General conditions of measurement 4 6 General characteristics 4 7 Transmission performance characteristics 4 8 Unwanted modulation 8 9 Out-of-band emission (Occasional measurement) 11 10 Assessment for transmitter equipped with limiters (Under co

22、nsideration) 11 11 Special measurement for supplementary signals (Under consideration) 12 Measuring arrangement I 12 Measuring arrangement II 13 Annex A (normative) CCIR Recommendation468-4 14 Annex B (normative) Extract from CCIR Recommendation559 21 Annex ZA (normative) Other international publica

23、tions quoted in this standard with the references of therelevantEuropean publications 22 Figure 1a Weighting network, simple form 14 Figure 1b Frequency response of the weightingnetwork shown in Figure 1a 15 Figure 2 Maximum tolerances for the frequencyresponse of the weighting network andthe amplif

24、ier 16 Figure 3 Constant resistance realization ofweightingnetwork 19 Figure 4 20 Figure 2 21 Figure 3 Filter-circuit 21 Table I 15 Table II 17 Table III 17 latest date of publication of an identical national standard (dop)1994-03-01 latest date of withdrawal of conflicting national standards (dow)1

25、994-03-01EN60244-13:1993 BSI 09-1999 3 Introduction This International Standard is one of a series of parts of IEC244. A number of existing parts of IEC244 are currently under review and several of these will be revised or withdrawn. When this process is complete, this series of publications will co

26、mprise one part dealing with general characteristics, with cross-references to relevant CCIR publications 2)and the Radio Regulations, and a number of specialized parts, each dealing with particular types of transmitter. 1 Scope This International Standard contains the method of measurement to asses

27、s the performance characteristics of frequency modulated transmitters for sound broadcasting. To assess all other characteristics, this standard needs to be used in conjunction with the publications quoted in clause2. This standard is intended to be used for type tests and acceptance or factory test

28、s. It is not mandatory to measure all the described characteristics. Additional measurements may be carried out as an agreement between customer and manufacturer. The performance characteristics measured in accordance with this standard makes possible the comparison of the results of measurements ma

29、de by different observers. Limiting values for acceptable performance are not covered by this standard but, in connection with the presentation of measured characteristics, some data are given for clarity. 2 Normative references The following standards contain provisions which, through reference in

30、this text, constitute provisions of this International Standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most rec

31、ent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. 2.1 IEC publications 215:1987, Safety requirements for radio transmitting equipment. Amendment No.1(1990). 244-1:1968, Methods of measurement for radio transmittersPar

32、t1: General conditions of measurement, frequency, output power and power consumption (under revision). Amendment No.2(1989) to IEC244-1A(1968), Methods of measurement for radio transmitters Part1: General conditions of measurement, frequency, output power and power consumption First supplement: Appe

33、ndices. 244-12-1:1989, Methods of measurement for radio transmittersPart12: Guideline for drawing up descriptive leaflets for transmitters and transposers for sound and television broadcasting Characteristics to be specified. 244-12-2:1989, Methods of measurement for radio transmittersPart12: Guidel

34、ine for drawing up descriptive leaflets for transmitters and transposers for sound and television broadcasting Specification sheets. 864-1:1986, Standardization of interconnections between broadcasting transmitters or transmitter systems and supervisory equipment Part1:Interface standards for system

35、s using dedicated interconnections. 2.2 CCIR publications Recommendation450, Transmission standards for FM sound broadcasting at VHF. Recommendation468-4:1990, Measurement of audio-frequency noise voltage level in sound broadcasting. Recommendation559, Objective measurement of radio-frequency protec

36、tion ratios in LF, MF and HF broadcasting. Recommendation643, System for automatic tuning and other applications in FM radio receivers for use with the pilot-tone system. Report463, Transmission of several sound programmes or other signals with a single transmitter in frequency-modulation sound broa

37、dcasting. 3 General terms and definitions 3.1 Frequency modulated sound transmitter The term “frequency modulated sound transmitter” is used in this standard to denote equipment with a FM radio-frequency output and a baseband frequency input which can accept monophonic, stereophonic and supplementar

38、y service multiplexed signals. 2) In most cases references to CCIR publications deliberately omit the revision number: it is assumed that reference will always be made to the later revision of CCIR publications. An exception is made here for Recommendation468-4, whose text is reproduced in full in t

39、his publication.EN60244-13:1993 4 BSI 09-1999 3.2 Description of the transmission systems for FM sound broadcasting The transmission systems for FM sound broadcasting are laid down in CCIR Recommendation450. Supplementary services are described in CCIR Report463 and CCIR Recommendation643. 3.3 Defin

40、itions of performance characteristics These definitions are given in the clauses describing the method of measurement and are in line with those given in IEC244-12-1 and IEC244-12-2. 4 General conditions of operation The FM sound transmitter shall be tested under normal operating conditions at its r

41、ated output power. The mains supply and the environmental conditions shall be stated with the measurement results. The FM sound transmitter shall be connected to a test load which has an impedance expressed in terms of return-loss relative to the nominal load impedance of the transmitter of not less

42、 than26dB at frequencies within the FM broadcasting band and16dB at frequencies of any measured unwanted frequency outside this band. 5 General conditions of measurement 5.1 Input and output signal arrangements For the purposes of measurement, the input and output signal arrangements are shown in th

43、e form of diagrams given on pages12 and13. The impedance of the test equipment, the test object and all connections between them shall be accurately matched. The performance characteristics shall be measured via a directional coupler. 5.2 Measuring equipment At the input: The modulating signals for

44、the transmitter under test shall be provided by one or two baseband low distortion generators covering the frequencies up to100kHz. For stereophony, a stereo coder shall be used. If the transmitter does not incorporate a stereo coder, an external test stereo coder shall be used. If required auxiliar

45、y equipment for generating, supplementary signals will be used (e.g.RDS coder). At the output: All measurements concerning the transmission performances shall be carried out at baseband signals, at the output of a test demodulator. For stereophony, the signals at the output of a test stereo decoder

46、shall be measured. For supplementary signals, a test decoder shall be used (e.g.RDS decoder). NOTEBecause the results of these measurements are critically dependent on the performance of the test equipment, it is necessary to check first the overall performance of the test equipment in the absence o

47、f the transmitter under test. 5.3 Modulation and output power conditions The modulation conditions for each measurement are given in the clauses describing the method of measurement. The output power is the power of the unmodulated carrier. All measurements shall be carried out at rated output power

48、. 5.4 Units used As needed, results may either be given in decibels or as percentages. 6 General characteristics The method of measurement of the general characteristics of the transmitter such as input impedance, output power and frequency stability will be described in IEC244-1 (under revision). 7

49、 Transmission performance characteristics Measurement can be performed on baseband signals (at frequencies up to a maximum of100kHz) and/or audio-frequency signals (at frequencies up to15kHz). The baseband measurements are made at the multiplex input of the transmitter. The audio band limiting and pre-emphasis in the transmitter and the de-emphasis in the demodulator are not in circuit, unless otherwise stated. The audio-frequency measurements are made at the audio input of the transmitter. The audio band l