BS EN 60244-11-1993 Methods of measurement for radio transmitters - Transposers for FM sound broadcasting《无线电发射机测量方法 第11部分 调频广播转发器》.pdf

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1、BRITISH STANDARD BS EN 60244-11:1993 IEC 244-11: 1989 Methods of measurement for radio transmitters Part 11: Transposers for FM sound broadcasting The European Standard EN 60244-11:1993 has the status of a British Standard UDC 621.396.7:621.317.3.08BS EN60244-11:1993 This British Standard, having be

2、en prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of the Standards Board and comesintoeffect on 15October1993 BSI 02-2000 The following BSI references relate to the work on this standard: Committee reference EEL/25 Special announc

3、ement in BSI News September 1993 ISBN 0 580 22572 0 Cooperating organizations The European Committee for Electrotechnical Standardization (CENELEC), under whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Italy Belgium Luxemb

4、ourg Denmark Netherlands Finland Norway France Portugal Germany Spain Greece Sweden Iceland Switzerland Ireland United Kingdom Amendments issued since publication Amd. No. Date CommentsBSEN60244-11:1993 BSI 02-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii For

5、eword 2 Text of EN 60244-11 3 National annex NA (informative) Committees responsible Inside back coverBSEN60244-11:1993 ii BSI 02-2000 National foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language vers

6、ion of EN 60244-11:1993 Methods of measurement for radio transmitters. Part11:Transposers for FM sound broadcasting, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical to IEC 244-11:1989, published by the International Electrotechnical Commission (IEC

7、) and is part of a multi-part series describing recommended methods of measurement for assessing the performance of radio transmitters. This Part of BS EN 60244 incorporates in a single publication all recommended measurements for FM sound broadcasting transposers. This standard is intended to be us

8、ed in conjunction with EN 60244-1 1) . 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 reproduction French captions have been retained on the figures. A British Standard does not pur

9、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

10、cover, pages i and ii, theEN title page, pages 2 to 18, 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 tha

11、t an identical British Standard, designated BS EN 60244-1 will be published in due course.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60244-11 April 1993 UDC 621.396.7:621.317.3.08 Supersedes HD 236.11 S1:1990 Descriptors: Radio equipment, sound broadcasting, transmitter, transposer, freque

12、ncy modulation, measurement, characteristic English version Methods of measurement for radio transmitters Part11:Transposers for FM sound broadcasting (IEC 244-11:1989) Mthodes de mesure applicables aux metteursradiolectriques Onzimepartie:Rmetteurs pour la radiodiffusion sonore modulation de frquen

13、ce (CEI 244-11:1989) Meverfahren fr Funksender Teil11:Umsetzer fr FM-Tonrundfunk (IEC244-11:1989) This European Standard was approved by CENELEC on 1993-03-09. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standa

14、rd 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. This European Standard exists in three official versions (English, Frenc

15、h, 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 members are the national electrotechnical committees of Austria, Belgium, D

16、enmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrote

17、chnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels 1993 Copyright reserved to CENELEC members Ref. No. EN 60244-11:1993 EEN60244-11:1993 2 BSI 02-2000 Foreword At the request of72nd Technical Board, HD236.11S1:1990 (IEC 244-11:1989) was submitted to the CENELEC voting procedur

18、e for conversion into a European Standard. The text of the International Standard was approved by CENELEC as EN 60244-11 on9March1993. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Contents Page Foreword

19、2 Introduction 3 1 Scope 3 2 Object 3 Section 1. General conditions of operation and measurement 3 Definition 3 4 Input and output signal arrangement 4 5 General conditions regarding input signalsource and test load 4 6 Terms and definitions for input and outputsignals 4 7 General conditions of oper

20、ation 5 Section 2. Input and output levels and general transposer characteristics 8 Input impedance mismatch 5 9 Adjustment and measurement of input levels 5 10 Automatic gain control 5 11 Adjustment and measurement of outputpower 6 12 Frequency 6 13 Internally generated unwanted signalsatthetranspo

21、ser input 7 Section 3. Transmission performance characteristics 14 Amplitude/baseband-frequency characteristic 7 Page 15 Audio-frequency harmonic distortion 7 16 Harmonic distortion in the coded channelsofastereophonic service 8 17 Crosstalk attenuation (stereophonicseparation) 8 18 Linear and non-l

22、inear crosstalk betweenAand B channels 9 19 Baseband-frequency intermodulation 9 20 Transmission performance for supplementaryservices (under consideration) 10 Section 4. Unwanted modulation and spurious emissions 21 Introduction 10 22 Unwanted frequency modulation 10 23 Unwanted amplitude modulatio

23、n 11 24 Unwanted modulation in the presence of an interfering input signal 12 25 Unwanted modulation signals in the presenceof two interfering input signals 13 26 Spurious emissions in the absence ofinterfering input signals 13 27 Spurious emissions in the presence of interfering input signals 14 28

24、 Changes in performance caused by feedbackfrom output to input 14 Appendix A Input impedance 17 Annex ZA (normative) Other international publications quoted in this standard with thereferences of the relevant European publications 18 Figure 1 Arrangement A 15 Figure 2 Arrangement B 15 Figure 3 Arran

25、gement C 16 Figure 4 Arrangement D 16 latest date of publication of an identical national standard (dop) 1994-06-01 latest date of withdrawal ofconflicting national standards (dow) EN60244-11:1993 BSI 02-2000 3 Introduction This standard is one of a series of parts of IECPublication244, describing r

26、ecommended methods of measurement for assessing the performance of radio transmitters. A number of the existing parts of IECPublication244 are currently under review and several of the older parts will be revised or withdrawn. When this process is complete, the overall publication will comprise one

27、part dealing with general characteristics, with cross-references to relevant CCIR publications and the Radio Regulations, and a number of specialist parts, each dealing with a particular type of transmitter. This new part, therefore, incorporates all recommended measurements for FM sound broadcastin

28、g transposers in a single publication and supersedes all clauses dealing with FM broadcasting transposers in the following publications: Publication 244-2, first edition, 1969 Publication 244-2A, first edition, 1969 Publication 244-2B, first edition, 1969 Publication 244-3, first edition, 1972 Publi

29、cation 244-3A, first edition, 1971 Publication 244-3B, first edition, 1972 Publication 244-4, first edition, 1973 1 Scope This standard applies to transposers, as defined inClause 3, operating in accordance with current CCIR Recommendation450 for FM sound broadcasting at VHF, including stereophony.

30、It also covers requirements for other multiplexed subcarrier services. 2 Object This standard lays down detailed methods of measurements, selected and recommended for assessing the essential performance and general characteristics of FM sound broadcasting transposers. It is not mandatory to measure

31、all the defined characteristics. Fewer or additional measurements may be appropriate. Any additional measurements should preferably be in accordance with relevant standards published by the IEC or by other international bodies. Limiting values for acceptable performance are not specified, as these a

32、re normally given in the equipment specification, or in requirements laid down by the responsible regulating bodies. This standard shall be used in conjunction with IECPublications244-1 and244-1A (now being revised) or, in due course, with the future edition replacing these publications. For guidanc

33、e on the information to be given in descriptive leaflets particular to the type of equipment considered in this standard, refer to the relevant sections of IEC Publication244-12. The methods of measurement described in this standard are intended for type tests but they may also be used for acceptanc

34、e tests and factory tests. (See IEC Publication244-1 for the meaning of these terms.) Section 1. General conditions of operation and measurement 3 Definition The term “FM sound broadcasting transposer” is used in this standard to refer to that equipment in an FM sound broadcasting relay station whic

35、h is connected between the feeder terminations of the receiving antenna and the transmitting antenna, and in which a frequency transposition is performed without demodulation. The majority of the measurements apply also to a receiver/transmitter combination. Any device for the suppression of unwante

36、d signals, irrespective of whether or not it is located inside the transposer, shall be considered to be part of the transposer for the purpose of this standard.EN60244-11:1993 4 BSI 02-2000 4 Input and output signal arrangement For the purpose of measurement, the transposer can be considered in ter

37、ms of input and output characteristics, and of transmission performance. Depending on the particular measurements, one of the three measuring arrangements described below may bc employed. Details of the arrangements arc given inFigure 1, Figure 2 andFigure 3. The modulating signals for the test tran

38、smitters inFigure 1 toFigure 3 shall be provided by: or more baseband (audio) signal generators, a high quality stereo coder of specified characteristics, auxiliary devices for the supplementary multiplexed subcarrier services, if required. All measurements concerning transmission performance are ca

39、rried out with baseband signals at the output of the test demodulator or, for some stereo tests, at the output of a high quality stereo decoder. Because the results of these measurements are critically dependent on the performance of the test equipment, it is necessary first to check the overall per

40、formance of the test equipment in the absence of the transposer. 5 General conditions regarding input signal source and test load 5.1 Input signal source The rated load impedance of the test transmitter shall be equal to the nominal input impedance of the transposer over the whole FM broadcasting ba

41、nd. 5.2 Test load The transposer shall be terminated with a test load, the impedance of which, expressed in terms of return loss relative to the nominal load impedance of the transposer, shall not be less than: 26dB at frequencies within the FM broadcasting band at the output of the transposer. 16dB

42、 at frequencies of any measured unwanted frequency outside this band. 5.3 Connection of measuring equipment to the transposer The preferred arrangement for the test load for low power transposers is an attenuator, the output of which is used to feed the radio-frequency test equipment. Alternatively,

43、 especially for high power transposers, the test equipment may be connected to the transposer output through a calibrated directional coupler or suitable matching network inserted in the line between the transposer and the test load. Any measuring instruments used at the input of the transposer are

44、connected to the input through a calibrated directional coupler or suitable matching network inserted in the line between the input signal source and the transposer. The terms “connected to the input” and “connected to the output” will hereafter be used for test equipment connected as described abov

45、e. 6 Terms and definitions for input and output signals 6.1 Test signals a) Monophonic signal The monophonic test input signal is a signal at the appropriate carrier frequency, modulated by the standard reference audio-frequency (k 1000Hz), with a specified frequency deviation. If required, other au

46、dio modulation frequencies may be chosen. b) Stereophonic signal The stereophonic input test signal is a signal at the appropriate carrier frequency modulated by a coded stereo (multiplex) signal in accordance with the standard concerned. The standard reference audio-frequency, k 1000Hz, shall be ap

47、plied to both left-hand channel A and right-hand channelB, or to one of them only, as required for each particular test. The frequency deviation for each component of the multiplex stereo signal shall be specified and shall comply with the standard concerned. When required, other audio modulating fr

48、equencies may be chosen.EN60244-11:1993 BSI 02-2000 5 c) Additional supplementary multiplexed subcarrier services When required, additional supplementary multiplexed subcarrier services, with specified characteristics, shall be introduced in the test signal. 6.2 Definitions relating to the transpose

49、r input signal a) Input voltage The r.m.s. voltage of a frequency modulated r.f. carrier at the input of the transposer expressed in 4V ordB(4V). b) Reference input level The reference input level for a monophonic or stereophonic input signal is60 dB(4V), i.e. 1mV. c) Input voltage range The input voltage range of a transposer is the range of input voltage within which the transposer performance specifications apply. 6.3 Definitions relating to the output signal a) Rated output power When the transposer is operating under specified con