1、CENELfC EN*b0835-2-3 73 E3 3404583 0363906 587 BRITISH STANDARD y P C Methods of measurement for equipment used in digital microwave radio transmission systems Part 2. Measurements on terrestrial radio-relay systems Section 2.3 RF branching networks The European Standard EN 6083523 : 1993 has the st
2、atus of a British Standar UDC 621.396.6 : 629.783 : 621.317.08 BS EN BS 7573 : Section 2.3 : 1995 IEC 835-23 : 1992 60835-23 1995 CENELEC ENab0835-2-3 93 3404583 Olb1907 413 BS 7573 : Section 2.3 : 1993 Amd. No. =(ATZ This British Standard, having been prepared under the direction of the Electronic
3、Equipment Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 15 May 1993 o BSI 1993 Date I 25-cs 53 -q5zc52 -77 The following BSI references relate to the work on this standard. Committee reference EEL!% Draft for comment 90;33696 DC ISBN O
4、580 2 1800 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Ichnical Committee EEU25, upon which the following bodies were represented: British Broadcasting Corporation British
5、Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Institution of Electrical Engineers Radio! Electrical and Mevision Retailers Association Radiocommunications Agency The following body was also represented in the drafting of the standard through subcommittees an
6、d panels: ERA Technology Ltd. CENELEC EN*b0835-2-3 93 3404583 0363908 35T BS 7573 : Section 2.3 : 1993 a Contents Committees responsible National foreword Page Inside front cover 11 Method 1 Scope 2 Definition and general considerations 3 Return-losdfrequency characteristic 4 In-band characteristics
7、 5 Isolation 6 Multi-carrier intermodulation products 3 1 Items usually measured between different ports 2 able Figure 1 Block diagram showing an example of an RF branching network incorporating filters 5 1 CENELEC EN*bO835-2-3 93 3404583 OLbL707 296 U BS 7573 : Section 2.3 : 1993 National foreword
8、This Section of BS 7573 has been prepared under the direction of the Electronic Equipment Standards Policy Committee. It is identical with IEC 835-2-3 Methods of meCrsurement for equipmerid used in digital microwave radw transmi-sswn systems Part 2 : MeusUr- on terratmal dio-relay systems Sectwn 3:
9、RF brunching networh, published by the International Electrotechnical Commission (IEC) . In 1993 the European Commi.ee for Electroteduu cai standardizaton (CENELEC) accepted IEC 83523 : 1992 as European Standad EN 6083523 : 1993. As a consequence of implementing the European Standard this British St
10、andard is renumbered as BS EN 6OK623 and any reference to Bs 7573 : Won 2.3 F = forward characteristics measurement (see clause 4); I = isolation measurement (see clause 5). 3 Return-loss/frequency characteristic See IEC 835-1 -2. The return-ioss/frequency characteristic should be measured within th
11、e pass-band of each port of the branching network with all other ports terminated either by matched loads or by transmitters and receivers. 4 In-band characteristics 4.1 Insertion loss See IEC 835-1-2. The insertion loss should be measured between ports Tn and C and between C and Rn (see figure l),
12、at the pass-band centre-frequency of the ports in question, with all other ports terminated either by matched loads or by transmitters and receivers. In some cases, when transmitter and receiver specifications are referred to the circulator ports. the reference points T, _ Tn and R, ._ Rn should als
13、o be referred to these ports. 4.2 Amplitude/frequency characteristic See IEC 835-1 -3. The amplitude/frequency characteristic should be measured between ports T, and C and between C and R, (see figure 1). both within the pass-band and within the stop-band of the ports in question, with all other por
14、ts terminated by matched loads or by transmitters and receivers. CENELEC EN#b0835-2-3 93 3404583 OlblL4 653 BS 7573 : Section 2.3 : 1993 r 4.3 Group-delay/frequency characteristic See IEC 835-1 -3. The group-delay/frequency characteristic should be measured between ports Tn and C and between C and R
15、n (see figure 1). within the pass-band of the ports in question with all other ports terminated by matched loads or by transmitters and receivers. NOTE - The amplitude and group-delaylfrequency characteristic of a transmit-receive section, including the contribution of the transmit and receive branc
16、hing networks. may be measured between the i.f. ports. 5 Isolation See IEC 835-1-2. The isolation should be measured by applying a C.W. signal at a speci- fied level and at a frequency corresponding to the centre-frequency of the pass-band to each transmit or receive port in turn and by measuring th
17、e level of the unwanted signal at all receive ports. The remaining unconnected transmit and receive ports should be termi- nated by matched loads or by transmitters and receivers, and port C should be terminated by a load corresponding to the antenna feeder impedance. NOTE - Depending upon the radio
18、-frequency channel arrangement, only some of the above port combinations may be of interest. 6 Multi-carrier intermodulation products 6.1 Definition and general considerations Multi-carrier intermodulation products are unwanted signals at frequencies which are com- binations of the transmit port fre
19、quencies and which fall into the pass-band of some receive ports, thus introducing interference into the receivers. These products may be generated by non-linearities in the waveguide system, such as im- perfect flanges or joints, or in circulators. Two transmit frequencies f, and f2 may generate, f
20、or example, the products 2f1 - f2 or 2f2 - f, while three transmit frequencies f, f2 and f3 may generate, for example, the product f, - f2 + f3. Only some of these frequency combinations may be of interest, depending on the radio frequency channel arrangement. 6.2 Method of measurement Signals from
21、two or three high-level generators, at specified levels and at frequencies corresponding to the mid-band frequencies of the transmit ports, are applied to the appro- priate transmit ports of the branching network. It is essential that generators having low harmonic levels be used in order to avoid t
22、he generation of additional products which would not otherwise be present in the equipment under test. A calibrated spectrum analyser is connected to a designated receive port having a pass- band which includes one of the combination frequencies given in 6.1. Port C should be terminated by a load ha
23、ving negligible non-linearity and a specified impedance correspond- ing to that presented by the antenna feeder. All other ports should be terminated by matched loads. The bandwidth of the spectrum analyser should be narrow enough to ensure that noise does not affect the accuracy of the measurement.
24、 The level of the intermodulation p b) frequency of the intermodulation product(s) to be measured together with the type of product (e.g. 21, - f2); c) maximum permitted level of the intermodulation product(s). 4 CENELEC EN860835-2-3 73 3404583 OLbLLb 426 BS 7573 : Section 2.3 : 1993 r De/vers lante
25、nne Tolfrom antenna En provenance des metteurs From transmitters Vers les rcepteurs To receivers CU-IEC 37592 Figure 1 - Bloc diagramme montrant un exemple de dispositif de branchement RF et ses filtres Block diagram showing an example of an RF branching network incorporating filters 5 CENELEC ENxb0
26、835-2-3 93 EI 3404583 OLbL9L7 362 Page 3 EN 60835-2-3 : 1993 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications When the international publication has been modified by CENELEC common modifidom, indicated by (mod), t
27、he relevant EN/HD applies. JEChbUcstion Date litle ENMD Date 8351-2 1992 Methocls of msasue for equipment wed in digital EN-1-2 1993 rnmwave dio trnnsmission systems Part I: Measilremats common to ermstnal dio-relay systems and satellite earth stat2ons seclion E BaJic dLa7acteriscics 1992 Section 3:
28、 %mission characterist2cs 83513 CENELEC EN*b0835-2-3 93 3404583 OLbL91 2T7 eiSr BS 7573 : Section 2.3 : 1993 t List of references See national foreword. I BS 7573 : Section 2.3 : 1993 IEC 835-2-3 : 1992 i BSI 2 Park Street London W1A 2BS BSI Linford Wood Milton Keynes MK14 6LE 9305- 5- 0.5k- B CENEL
29、EC EN*b0835-2-3 93 3404583 OIIb1L II35 . BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Contract requirements A B
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37、yright Manager, Publications at Milton Keynes. . SBN O 580 21800 7 EEL125 CENELEC EN%b0835-2-3 93 E3 3404583 0363920 957 r“ AMD 8692 i“ Amendment No. 1 published and effective from 15 August 1995 to BS 7573 : Section 2.3 : 1993 Methods of measurement for equipment used in digital microwave radio tra
38、nsmission systems Part 2. Measurements on terrestrial radio-relay systems Section 2.3 RF branching networks NOTE. The European Committee for Electrotechnical Standardization (CENELEC) has accepted IEC 835-24 : 1992 as a European Standard designated as EN 6083524: 1993. This amendment implements EN 6
39、083523 : 1993 as a British Standard in the Bs EN series. Implementation of European Standard Front cover Delete the outside front cover and substitute the attached. AMD 8692August 1995 . National foreword At the end of paragraph 1 insert the following paragmph. in 1993 the European Commim for Eectro
40、technicai Staneon (CENELEC) accepted iEC 83523: 1992 as European Standard EN 60835-223: 1993. As a consequence of implementing the European Standard this British !hndard is renumbered as BS EN 635-2-3 and any reference to B!3 7573 : Section 2.3 should be read as a reference to J3S EN 6083523. AMD 86
41、92lAugust 1995 -_-_-_-_-_-_- EN title page and foreword Immediately aRer the national foreword, insert the attached EN title page and foreword page. AMD 869WAugust 1995 _-_-_-_- New annex ZA Immediately after figure 1, insert the attached new annex ZA AMD 8692August 1995 -_-_-_-_-_- 9508 Product cod
42、e 00510620 EPU12 CENELEC ENxbO35-2-3 93 E3 3404.583 OLbL92L 893 BRITISH STANDARD y B MeLhods of measurement for equipment used in digital microwave radio transmission systems Part 2. Measurements on terrestrial radio-relay systems Section 2.3 RF branching networks The European Standard EN 63523 : 19
43、93 has the status of a British Standard UDC 621.396.6 : 629.783 : 621.317.08 3s EN W5-23 : 1995 3s 7573 : 3ection 2.3 : 1995 IEC 835-23 : 1992 CENELEC EN*bO35-2-3 93 “ EUROPEAN mm NORMJ3 EUROPEENNE EN 3404583 OLbL22 72T 60835243 UDC 621.396.6 : 629.783 : 621.317.08 Descriptors: Radiocommunications,
44、teiecommunicaiq communication equipment, earth saiow radio-relay systems, radio frequencies, tests, characteristics, measurements English venion Methods of measurement for equipment used in digital microwave radio transmisSion systems Part 2: Measurements on kd radbrelay systems Section 3 RF branchi
45、ng networks 835-23 : 1992) Mthodes de mesure applicables au mel utiiis pour les Systemes de transmissi on numrique en hypemence Partie 2: Mesures applicables aux faisceaux hertziens terrestres Hauptabschnia 3 RF-Verzweigungsnetzwerke Section 3 Dispositifs de branchement am frquences radiolectriques
46、(CE1 835-23 : 1992) Meverfahren fi& Gerate in digitalen Mikroweilert-Finkubemen Tei 2: Messungen an terrestrischen Richtfmbyskmen (Ec 835-2-3 : 1992) This European Standard was approved by CENELEC on 1993-0746. CENELEC members are bound to comply with the CENKENELEC Internai Regulations which stipua
47、te the conitions for giving this European Standard the stahis of a national standard without any alteration. Uptixiate lists and bibliographid references concerning such national siandards may be obtained on application to the Central Secretariat or to any CENELEC member. This European Standard exis
48、ts 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 officiai vemions. CENELEC members are the nationai electr
49、otechnical committees of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normahsation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Centrai Secretariat: rue de Stassart 35, B-1050 Brussels O 199
