1、3404583 0337953 27T BRITISH STANDARD Methods of measurement for radio transmitters Part 12. Guideline for drawing up descriptive leaflets for transmitters and transposers for sound and television broadcasting Section 12.1 Characteristics to be specified The European Standard EN 60244-12-1 : 1993 has
2、 the status of a British Standard IJDC 621.397.13 : 621.396.6 : 621.317.3.08 BS EN 60244- 12- 1 : 1994 IEC 244-12-1 : 1989 m 3404583 0337952 Lob m Amd. No. Date BS EN 60244-12-1 : 1994 Cooperating organizations kxt affected The European Committee for Electrotechnical Standardization (CENELEC), under
3、 whose supervision this European Standard was prepared, comprises the national committees of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom mi British Standard, having
4、 been prepared under the direction of the Electronic Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 October 1994 O BSI 1994 The following BSI references relate to the work on this standard: Committee reference EEL/25 Special
5、 announcement in aSINaos, September 1993 ISBN O 580 23452 5 = 3404583 0337953 042 = BS EN 60244-12-1 : 1994 Contents Cooperating organizations National foreword page Inside front cover i Foreword 2 %xt of EN 60244-12-1 3 National annex NA (informative) Committees responsible Inside back cover Nation
6、al annex NB (informative) Cross-references Inside back cover National foreword This British Standard has been prepared under the direction of the Electronic Equipment Standards Policy Committee and is the English language version of EN 60244-12-1 : 1993 Methods of measurement for radio tmmitters hrt
7、 12: Guideline for dmwing up descriptive leafils for transmitters and trunsposers for sound and television broadcasting - CharactemStics to be speci*fied, published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 244-12-1 : 1989, published by the In
8、ternational Electrotechnical Commission (IEC) and is part of a series describing recommended methods of measurement for assessing the performance of radio transmitters. This part applies to manufacturers descriptive leaflets and specifies uniform methods of expressing performance characteristics, li
9、sts essential characteristics and technical information needed for approving and comparing equipment, and provides any relevant cross-references to standardized methods of measurement for the performance characteristics listed. This Part is intended to be used in conjunction with BS EN 60244-12-2 :
10、1994 It is anticipated that the other Parts of IEC Publication 244 will be published as identical British Standards, subject to their harmonization by CENELEC. Compliance with a British Standard does not of itself confer immunity from legai obligations. i 3404583 0337954 T9 EUROPEAN STANDARD NORME E
11、UROPENNE EN 60244- 12- 1 EUROPISCHE NORM April 1993 CK 621 .397.13:621.396.6:62 1.317.3.08 Uescnptors: Sound broadcasting, television broadcasting, radio equipment, transmitter, characteristic. specification Supersedes HD 236.12.1 S1 : 1991 English version Methods of measurement for Part 12: Guideli
12、ne for drawing up transmitters and transposers for radio transmitters descriptive leaflets for sound and television broadcasting - Characteristics to be specified (IEC 244-12-1 1989) Mthodes de mesure applicables aux metteurs radiolectriques Douzime partie: Guide de rdaction des feuilles de spcifica
13、tion des metteurs et des rmetteurs de tlvision et de radiodiffusion sonore - Caractristiques spcifier (CE1 244-12-1 : 1989) Meoverfahren fr Funksender Teil 12: Anleitung zur Erstellung von Datenblttern fr Funksender und Umsetzer fr Fernseh- und lbnrundfunk - Anzugebende Kennwerte (IEC 244-12-1 1989)
14、 This European Standard was approved by CENELEC on 1993-03-09. CENELEC members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical
15、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 in any other language made by translation under the responsibility of a CENE
16、LEC 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway
17、, Portugal, Spain, Sweden, Switzerland and United Kingdom. CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B-1050 Brussels O 1993 Copyright reserv
18、ed to CENELEC members Ref. No. EN 60244-12-1 : 1993 E Previous page is blank 3404583 0337955 935 Foreword At the request of 72nd Technical Board, submitted to the CENELEC voting procedure for conversion into a European Standard. The text of the International Standard was approved by CENELEC as EN 60
19、244-12-1 on 9 March 1993. The following dates were fixed: HD 236.12.1 S1 : 1991 (IEC 244-12-1 : 1989) was - latest date of publication of an identical national - latest date of withdrawal of conflicting national standard (dop) 1994-06-01 standards (dow) - Annexes designated normative are part of the
20、 body of the standard. In this standard, annex ZA is normative. W 3404583 013795b 851 W Page 3 EN 60244-12-1 : 1993 CONTENTS Page INTRODUCTION . 4 Clause 1. scope 4 2. Object . 4 3. General notes on the format of the leaflet . 4 SECTION ONE - GENERAL CHARACTERISTICS APPLICABLE TO ALL CATEGORIES OF T
21、RANSMITTERS AND TRANSPOSERS 4. Introduction 5 5. Characteristics . 5 SECTION Two - PERFORMANCE CHARACTERISTICS FOR TELEVISION TRANSMITTERS 10 13 6. Introduction 7. Characteristics of the vision section 10 8. characteristics of the sound section . SECTION THREE - PERFORMANCE CHARACTERISTICS FOR TELEV
22、ISION TRANSPOSERS 9. Introduction 14 10. Characteristics of the vision channel 14 1 1. Characteristics of the sound channel 17 SECTION FOUR - PERFORMANCE CHARACTERISTICS FOR TRANSMITTERS FOR FM SOUND BROADCASTING 12. Introduction 13. Characteristics . 17 17 SECTION FIVE - PERFORMANCE CHARACTERISTICS
23、 FOR 14. Introduction 19 15. Characteristics . 19 AMPLITUDE -MODULATED SOUND TRANSMITTERS SECTION SIX - PERFORMANCE CHARACTERISTICS FOR TRANSPOSERS FOR FM SOUND BROADCASTING 21 16. Introduction 17. Characteristics . 2 1 SECTION SEVEN - PERFORMANCE CHARACTERISTICS FOR (Under consideration) VESTIGIAL-
24、 SIDEBAND DEMODULATORS Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications 24 m 3404583 O337957 798 m Page4 I I EN60244-12-1 : 1993 METHODS OF MEASUREMENT FOR RADIO TRANSMITTERS Part 12: Guideline for drawing up desc
25、riptive leaflets for transmitters and transposers for sound and television broadcasting - Characteristics to be specified INTRODUCTION As an interim measure and in order to ease the updating of references made to publications dealing with methods of measurement with clauses of this standard, tables
26、initially belonging to sections of the different documents composing this standard are published in I EC Publication 244-12-2: Specification sheets. This standard is one of a series of parts of I EC Publication 244, describing recommended methods of measurement for assessing the performance of radio
27、 transmitters and shall be used in conjunction with IEC hblication 244-12-2 regularly updated while dedicated parts of IEC Publication 244 are currently being revised. 1. scope This standard applies to the manufacturers descriptive leaflets providing information on transmitters and transposers for s
28、ound and television broadcasting. 2. Object The standard is intended: - to lay down uniform methods of expressing the performance characteristics of transmitters and - to list the essential characteristics and technical information needed for the appraisal and - to provide, where appropriate, cross
29、references to standardized methods of measurement for the Leaflets prepared in accordance with this standard need not form but may form part of transposers for sound and television broadcasting; comparison of equipment; performance characteristics listed. instruction manuais supplied with the equipm
30、ent. 3. Generai notes on the format of the leaflet Two categories of characteristics are specified as follows: - general characteristics applicable to all categories of transmitters and transposers; - performance characteristics specific to a particular type of equipment, e.g. a television trans- Th
31、e general characteristics cover electrical and other characteristics which can have an effect on mitter or a transposer for frequency-modulated sound broadcasting. the performance of the equipment; they shall include the following technical information: a) functional description of the various items
32、 of equipment including block diagrams, where appropriate ; 3404583 0337958 624 = Page 5 EN 60244-12-1 : 1993 b) layout of the equipment and constructional details, including dimensions and weights, of the e) figures about cooling and means and quality of coolant; individual items and ancillary equi
33、pment required for normal operation; d) characteristics affecting the environment, e.g. heat dissipation in the transmitter room and e) type designation of the equipment and individual items, where applicable; fi number and type designation of thermionic tubes used in power stages. Some characterist
34、ics and/or technical information may not be appropriate to all types of equipment, e.g. low power transmitters. Additional characteristics, other than those mentioned in this standard, may be included in a particular leaflet. As far as practicable, the definitions given in this standard are in accor
35、dance with those of the various parts of I EC Publication 244. It should be noted, however, that the definitions are intended for the guidance of authors and should not in general appear in the actual leaflets. acoustic noise; SECTION ONE - GENERAL CHARACTERISTICS APPLICABLE TO ALL CATEGORIES OF TRA
36、NSMITTERS AND TRANSPOSERS 4. Introduction The general characteristics described in this section are listed in Table I of IEC Publica- Where appropriate, reference is made in Table I to the standardized methods of measurement tion 244-12-2. and test signals described in other I EC publications. 5. Ch
37、aracteristics 5.1 Transmission system The transmission system(s) the transmitter or transposer is capable of handling shall be stated and be designated in accordance with the latest issue of the relevant CCIR Recommendation or Report, e.g.: - for television: CCIR Report 624; - for FM sound broadcast
38、ing: CCIR Recommendation 450; - for AM sound broadcasting: CCIR Report 458. 5.2 Frequency range The frequency range refers to the frequency band (or bands) in which the transmitter or The following details shall be specified: transposer is capable of operating. - the lower and upper limits of the fr
39、equency band (or bands), expressed in kHz or MHz; - information on any frequency dependent components or sub-assemblies in the equipment that shall be replaced or modified to cover the above specified frequency range; - the way in which the camer frequency is generated and whether an external drive
40、may be used instead; 3404583 0337959 560 Page 6 EN 60244-12-1 : 1993 - for transposers, the frequency range for reception and for transmission, together with any input and output frequency combinations which shall be avoided; - if applicable, the switching time (min. and max.) for a frequency change
41、 for transmitters which operate in different bands or in different frequencies within a band (see short wave transmitters). 5.3 Carrier frequency stability The carrier frequency stability shall be specified as the difference, expressed in Hz between the highest and the lowest value of carrier freque
42、ncy during the following periods of time: - 1 h for short-term stability, and - six months for long-term stability. transposer, the frequency transposition stability shall be given. For a television transmitter, the stability of both sound and vision carriers shall be given. For a 5.4 Intermediate f
43、requencies If the modulation or conversion process is carried out at intermediate frequencies, the inter- mediate frequency or frequencies shall be stated. 5.5 Rated output power (rated output power range) the transmitter or transposer shall deliver at its output under specified conditions of operat
44、ion. The rated output power (or rated output power range) is the power (or the range of the power) that The rated output power, expressed in W or kW, shall be stated as follows: - for television transmitters and transposers: the peak envelope power of the vision signal; - for FM sound transmitters a
45、nd transposers: the power of the unmodulated carrier; - for double-sideband AM sound transmitters: the power of the unmodulated carrier; - for single-sideband AM sound transmitters: the peak envelope power. In this last case, the degree of carrier reduction, expressed in dB relative to peak envelope
46、 power, shall also be specified. 5.6 Nominal load impedance The nominal load impedance, i.e. the nominal value of the rado-frequency impedance into which the transmitter or transposer shall deliver its rated output power, shall be specified. 5.7 Load impedance mismatch The voltage standing wave rati
47、o presented by the radio-frequency load impedance mismatch concerns both: a) the maximum V.S.W.R. up to which the transmitter or transposer is capable of operating within b) the maximum V.S.W.R. for which the transmitter or transposer is capable of operating without the performance specifications; d
48、amage or without the intervention of a protective device. Both values shall be specified. 3404583 0337760 282 Page 7 EN 60244-12-1 : 1993 5.8 Nominal input impedance The nominal input impedance, i.e. the nominal value of the impedance presented at the input connector (or connectors) of the transmitt
49、er or transposer, shall be specified in ohms, balanced or unbalanced. If a high-impedance audio-frequency input is used, the reactive part of the impedance shall also be given. 5.9 Nominal input impedance mismatch The nominal input impedance mismatch relates to the mismatch measured at the input connec- tor (or connectors) for any frequency within the audio-frequency or video-frequency bandwidth, or the radio-frequency channel bandwidth. It is expressed in terms of the ratio of the incident wave to the reflected wave. The minimum value of this rati
