1、BRITISH STANDARD BS EN 60835-3-4:1997 BS 7573-3.4: 1993 IEC 835-3-4: 1993 Incorporating Amendment No. 1 to BS 7573-3.4:1993 (renumbers BS as BSEN 60835-3-4: 1997) Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth station
2、s Section 3.4 Low noise amplifier The European Standard EN 60835-3-4:1995 has the status of a British Standard ICS 33.060.30BSEN60835-3-4:1997 This British Standard, having been prepared under the directionof the Electronic Equipment Standards Policy Committee, was published underthe authority of th
3、e Standards Board and comesintoeffect on 15 July 1993 BSI 03-2000 The following BSI references relate to the work on this standard: Committee reference EEL/25 Draft for comment 91/22366 DC ISBN 0 580 21875 9 Committees responsible for this British Standard The preparation of this British Standard wa
4、s entrusted by the Electronic Equipment Standards Policy Committee (EEL/-) to Technical Committee EEL/25, upon which the following bodies was represented: British Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc Independent Tele
5、vision Commission Institution of Electrical Engineers Radio, Electrical and Television Retailers Association Radiocommunications Agency The following body was also represented in the drafting of the standard, through subcommittees and panels: ERA Technology Ltd. Amendments issued since publication A
6、md. No. Date Comments 9596 September 1997 Indicated by a sideline in the marginBSEN60835-3-4:1997 BSI 03-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN 60835-3-4 3BSEN60835-3-4:1997 ii BSI 03-2000 National foreword This Section of BS EN 6083
7、5 has been prepared by Technical Committee EPL/102 (formerly EEL/25), and is the English language version of EN 60835-3-4:1995, Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 4: Low noise amplifier, p
8、ublished by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 835-3-4:1993, published by the International Electrotechnical Committee (IEC). Cross-references Attention is drawn to the fact thatAnnex ZA lists normative references to international publicat
9、ions with their corresponding European publications. The British Standards which implement these international or European publications may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Stand
10、ards Electronic Catalogue. A British Standard does not purport 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 pag
11、es This document comprises a front cover, an inside front cover, pagesi andii, theEN title page, pages2 to4, 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 insid
12、e front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 60835-3-4 January 1995 ICS 33.060.30 Descriptors: Telecommunications, radiocommunications, communication equipment, earth stations, microwave frequencies, digital technics, amplifiers, measurements, characteristics English version Me
13、thods of measurement for equipment used in digital microwave radio transmission systems Part3:Measurements on satellite earth stations Section4:Low noise amplifier (IEC 835-3-4:1993) Mthodes de mesure applicables au matriel utilis pour les systmes de transmission numrique en hyperfrquence Partie3:Me
14、sures applicables aux stations terriennes de tlcommunications par satellite Section 4: Amplificateur faible bruit (CEI 835-3-4:1993) Meverfahren fr Gerte in digitalen Mikrowellen-Funkbertragungssystemen Teil3: Messungen an Satelliten-Erdfunkstellen Hauptabschnitt 4: Rauscharme Verstrker (IEC835-3-4:
15、1993) This European Standard was approved by CENELEC on 1994-12-06. 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 national standard without any alteration. Up-to-date lists and bibliograp
16、hical 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
17、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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands,
18、Norway, 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 1995 Copyright re
19、served to CENELEC members Ref. No. EN 60835-3-4:1995 EEN60835-3-4:1995 BSI 03-2000 2 Foreword The text of the International Standard IEC 835-3-4:1993, prepared by SC 12E, Radio-relay and fixed satellite communications systems, of IECTC 12, Radiocommunications, was submitted to the formal vote and wa
20、s approved by CENELEC as EN 60835-3-4 on 1994-12-06 without any modification. The following dates were fixed: Annexes designated “normative” are part of the body of the standard. In this standard, Annex ZA is normative. Annex ZA has been added by CENELEC. Contents Page Foreword 2 Introduction 3 1 Sc
21、ope 3 2 Normative references 3 3 Noise temperature 3 4 Gain and gain stability 3 5 Amplitude and group delay/frequency characteristics 3 6 Input/output level characteristics 3 7 Input and output return loss 3 8 Effect of out-of-band signals upon gain compression and noise temperature 4 9 Intermodula
22、tion products 4 Annex ZA (normative) Other international publications quoted in this standard withthereferences of the relevant Europeanpublications Inside back cover latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsemen
23、t (dop) 1995-12-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 1995-12-01EN60835-3-4:1995 BSI 03-2000 3 Introduction When the low noise amplifier is measured as part of a sub-system, the input and output ports of the amplifier should be defined, and
24、 any associated networks such as r.f. filters, switches or directional couplers should be specified. The level of the test signal applied to the input of the low noise amplifier should be low enough to ensure that the amplifier is not driven into compression, or above the operating point at which da
25、mage may occur. Throughout all of the following measurements, stability of the amplifier under test should be verified (e.g. when switching from one signal source or load to another, or when overloaded to a specified extent). Alternatively, the amplifier should return automatically to a stable opera
26、ting point after the switching operation, or when the overloading signal is removed. 1 Scope This section of IEC 835-3 describes methods of measurement on low noise amplifiers used in satellite earth stations. 2 Normative references The following normative documents contain provisions which, through
27、 reference in this text, constitute provisions of this section of IEC 835-3. At the time of publication, the editions indicated were valid. All normative documents are subject to revision, and parties to agreements based in this section of IEC 835-3 are encouraged to investigate the possibility of a
28、pplying the most recent editions of the normative documents indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. IEC 835-1-2:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common t
29、o terrestrial radio-relay systems and satellite earth stations Section 2: Basic characteristics. IEC 835-1-3:1992, Methods of measurement for equipment used in digital microwave radio transmission systems Part 1: Measurements common to terrestrial radio-relay systems and satellite earth stations Sec
30、tion 3: Transmission characteristics. 3 Noise temperature The noise temperature of the low noise amplifier should be measured as described in clause7 of IEC835-1-2. However, the noise contribution of any associated sub-systems should be taken into account during the measurement. 4 Gain and gain stab
31、ility See IEC 835-1-2. The gain of the low noise amplifier should be measured within the operating level range of the amplifier. Gain stability is defined as the deviation of the actual gain from the nominal value at a specified frequency, within a specified time interval. It is convenient to distin
32、guish between short-term stability (of the order of 1 min) and long-term stability (of the order of1 day). Gain stability should be measured by a gain recording device over the specified time interval. Repetition of this recording at several specified test-signal frequencies may be desirable. 5 Ampl
33、itude and group delay/frequency characteristics See IEC 835-1-3. These characteristics should be measured at a test-signal level within the specified operating level range of the amplifier, between specified frequency limits. 6 Input/output level characteristics The curve relating the output level t
34、o the input level is measured by varying the input signal level within the specified input level range. From this curve, the gain compression of the amplifier can be evaluated, and the linear operating range of the amplifier can be verified. For the basic method of level measurement, refer to IEC 83
35、5-1-2. For gain compression measurement, refer to IEC 835-1-3. 7 Input and output return loss For the method of measurement, refer to IEC 835-1-2, “Basic Characteristics”.EN60835-3-4:1995 4 BSI 03-2000 8 Effect of out-of-band signals upon gain compression and noise temperature Out-of-band signals ca
36、n cause gain compression and can increase the noise temperature of the low noise amplifier. These effects can be evaluated by applying an out-of-band signal of specified frequency and level to the input of the amplifier through a suitable directional coupler and isolation device, together with the t
37、est signal. The change of either gain or noise temperature due to the out-of-band signal is then measured, as given in 3 and 4 above. 9 Intermodulation products For the method of measurement, refer to IEC 835-1-2. When measuring low-level intermodulation products, the noise level may be reduced, if
38、necessary, by terminating the direct arm of the directional coupler with a cold load.EN60835-3-4:1995 BSI 03-2000 Annex ZA (normative) Other international publications quoted in this standard with the references of the relevant European publications This European Standard incorporates by dated or un
39、dated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only whe
40、n incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. NOTEWhen the international publication has been modified by CENELEC common modifications, indicated by (mod), the relevant EN/HD applies. IEC publication Date Title EN/HD
41、Date 835-1-2 1992 Methods of measurement for equipment used in digital microwave radio transmission systems Part1: Measurements common to terrestrial radio-relay systems and satellite earth stations Section 2: Basic characteristics EN 60835-1-2 1993 835-1-3 1992 Section 3: Transmission characteristi
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