BS-EN-60835-3-14-1997 BS-7573-3.14-1997 IEC-60835-3-14-1996.pdf

BRITISH STANDARD BS EN 60835-3-14: 1997 BS 7573-3.14: 1997 IEC 835-3-14: 1996 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 3.14 Earth stations for satellite news gathering (SNG) The European Standard EN 60835-3-14:1996 has the status of a British Standard ICS 33.060.30 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-14:1997 This British Standard, having been prepared under the direction of the Electrotechnical Sector Board, was published under the authority of the Standards Board and comes into effect on 15 February 1997 © BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference EPL/12/5 Draft for comment 95/210491 DC ISBN 0 580 26933 7 Committees responsible for this British Standard The preparation of this British Standard was entrusted by Technical Committee EPL/12, Radio communication, to Subcommittee EPL/12/5, Radio communication systems, upon which the following bodies were represented: British Broadcasting Corporation British Radio and Electronic Equipment Manufacturers Association British Telecommunications plc ERA Technology Ltd. Institution of Electrical Engineers Radio, Electrical and Television Retailers Association Radiocommunications Agency Amendments issued since publication Amd. No.DateComments Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-14:1997 © BSI 12-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 60835-3-143 List of referencesInside back cover Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60835-3-14:1997 ii © BSI 12-1998 National foreword This British Standard has been prepared by Subcommittee EPL/12/5 and is the English language version of EN 60835-3-14:1996 Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations: Section 3.14 Earth stations for satellite news gathering (SNG), published by the European Committee for Electrotechnical Standardization (CENELEC). It is identical with IEC 835-3-14:1996 published by the International Electrotechnical Commission (IEC). BS EN 60835 is published in three Parts. The other Parts are: Part 1: Measurement common to terrestrial radio-relay systems and satellite earth stations; Part 2: Measurements on terrestrial radio-relay systems. Some of the many Sections of the three Parts have appeared under the number BS 7573, of the same generic title. This Section describes methods applicable to satellite news gathering (SNG) terminals. 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. Cross-references Publication referred toCorresponding British Standard BS EN 60835 Methods of measurement for equipment used in digital microwave radio transmission systems EN 60835-1-2:1993 (IEC 835-1-2:1992) Part 1 Measurements common to terrestrial radio-relay systems and satellite earth stations Section 1.2:1995 Basic characteristics Part 3 Measurements on satellite earth stations EN 60835-3-2:1996 (IEC 835-3-2:1995) Section 3.2:1996 Antenna EN 60835-3-7:1995 (IEC 835-3-7:1995) Section 3.7:1996 Figure-of-merit of receiving system EN 60835-3-13:1996 (IEC 835-3-13:1996) Section 3.13:1997 VSAT systems Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 10, 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. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 60835-3-14 July 1996 ICS 33.060.30 Descriptors: Telecommunications, radiocommunications, communication equipment, earth station, microwave frequencies, digital technics, measurements, characteristics English version Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 14: Earth stations for satellite news gathering (SNG) (IEC 835-3-14:1996) Méthodes de mesure applicables au matériel utilisé pour les systèmes de transmission numérique en hyperfréquence Partie 3: Mesures applicables aux stations terriennes de télécommunications par satellite Section 14: Stations terriennes pour le reportage dactualités par satellite (RAS) (CEI 835-3-14:1996) Meßverfahren für Geräte in digitalen Mikrowellen-Funkübertragungssystemen Teil 3: Messungen an Satelliten-Erdfunkstellen Hauptabschnitt 14: Erdfunkstellen für Reportagen über Satellit (SNG) (IEC 835-3-14:1996) This European Standard was approved by CENELEC on 1996-07-02. 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 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, 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 members are the national electrotechnical 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 Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B 1050 Brussels © 1996 Copyright reserved to CENELEC members Ref. No. EN 60835-3-14:1996 E Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-14:1996 © BSI 12-1998 2 Foreword The text of document 12E/259/FDIS, future edition 1 of IEC 835-3-14, prepared by SC 12E, Radio-relay and fixed satellite commmunication systems, of IEC TC 12, Radiocommunications, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 60835-3-14 on 1996-07-02. 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 Foreword2 1 Scope 3 2 Normative references 3 3 Definition 3 4 General considerations 3 5 Methods of measurement 4 5.1 Antenna and r.f parameters 4 5.2 Baseband parameters 5 5.3 Power supply system 6 6 Reference documents 6 Annex ZA (normative) Normative references to international publications with their corresponding European publications 9 Figure 1 Typical example for a satellite network including an SNG terminal 7 Figure 2 Simplified block diagram of a typical SNG terminal (excluding communications channel)8 latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement(dop) 1997-04-01 latest date by which the national standards conflicting with the EN have to be withdrawn(dow) 1997-04-01 Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-14:1996 © BSI 12-19983 1 Scope This section of IEC 835-3 deals with measurement methods applicable to satellite news gathering (SNG) terminals. 2 Normative references The following normative documents contain provisions which, through 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 on this section of IEC 835-3 are encouraged to investigate the possibility of applying 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 to terrestrial radio-relay systems and satellite earth stations Section 2: Basic characteristics. IEC 835-3-7:1995, Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 7: Figure-of-merit of receiving system. IEC/DIS 835-3-2, Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 2: Antenna1). IEC/DIS 835-3-13, Methods of measurement for equipment used in digital microwave radio transmission systems Part 3: Measurements on satellite earth stations Section 13: VSAT systems1). 3 Definition For the purpose of this section of IEC 835-3, the following definition applies. satellite news gathering (SNG) a highly portable news-gathering satellite uplink system of small size and weight operating in the fixed satellite service (FSS), transported to the site of a news event, with the purpose of uplinking a local video programme with its associated sound programme. In addition to this main function, monitoring facilities are normally provided to assess the main quality parameters of the uplinked picture and sound signals. A two-way communication channel is available for voice communication between the SNG terminal and the earth station receiving the uplinked signals 4 General considerations A typical example for a satellite network including an SNG terminal is shown in Figure 1, depicting the signal paths linking the satellite earth station, the SNG terminal, and the receive-only earth stations feeding TV broadcast transmitters, cable TV (CATV) networks, etc. Two kinds of SNG terminals may be used depending on the application field. A flyaway SNG system is accommodated in several boxes suitable for delivery in an aircraft while a vehicle SNG system includes, in addition to the items of a flyaway system, more comprehensive communications, monitoring, and power supply facilities. An SNG vehicle is used for the origination of TV broadcast material from locations which cannot be served by terrestrial means, but which are conveniently accessible by the vehicle. 1) IEC/DIS 835-3-2 and IEC/DIS 835-3-13 are currently at the stage of final Draft International Standard 12/247/FDIS and 12E(CO)166 respectively. Licensed Copy: sheffieldun sheffieldun, na, Sat Nov 11 09:38:25 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60835-3-14:1996 4 © BSI 12-1998 A typical block diagram of an SNG terminal using digital modulation is shown in Figure 2. According to this diagram, the video signal plus left and right components of the accompanying stereo sound signal are fed to a video/sound encoder, and the composite digital signal thus generated is used to modulate a quadrature phase shift keying (QPSK) modulator. This modulated signal is up-converted to the UHF band by using a synthesized oscillator, which is tuneable for selecting the appropriate satellite transponder channel. The UHF band signal is again up-converted by a single-frequency oscillator and a broad-band converter covering the relevant transponder band. In the example shown, this signal is amplified by a high-power amplifier feeding, via a coupler and a switch, the transmit bandpass filter. The low-level port of the coupler can be connected to an external counter or spectrum analyzer for carrying out frequency or spectrum measurements. The switch is used to route the r.f. signal, during maintenance tests, to a dummy load for facilitating output power measurements. The antenna is coupled, via an ortho-mode transducer applied for separating the transmit and receive signals having orthogonal polarizations, to the transmit and receive bandpass filters. The output r.f. signal of the receive filter is coupled to the low-noise down-converter converting the r.f. signal to the UHF band. This broadband UHF signal is again down-converted into the i.f. band by a synthesized oscillator tuned to the appropriate transponder channel. A QPSK demodulator is used for demodulating the composite digital signal and for feeding it to a video/sound decoder to recover the video and sound signals. SNG terminals utilizing analogue FM modulation, which are less portable because of the larger antenna and output power required, have been in use for many years. In their case, the two sound signals are used to modulate two subcarriers which are then added to the video signal, and the composite signal is routed to an FM modulator producing an i.f. carrier. In the receive part, the composite signal is recovered by an FM demodulator yielding the video signal and the two sound subcarriers which are, in turn, demodulated to yield the stereo sound signals. It is desirable to assess the quality of the video and sound signals (see 5.2.3), uplinked by the SNG terminal, independently from other parts of the network shown in Figure 1. For this purpose, an r.f. loop is usually established, realized either by satellite paths (see path 1A and 1B in Figure 1), or by a loop test translator inserted between the HPA (high power amplifier) or up-converter output and the low-noise down-converter input at r.f., converting the transmitted frequency into the received frequency. This loop test, eliminating the satellite uplink and downlink paths and the space segment cost, is sometimes preferred. According to Figure 2, it is also possible to establish a loop by linking the up-converter 1 output to the down-converter 2 input in the UHF band. However, this looping arrangement would exclude from the test the up-converter 2 and down-converter 1 and the r.f. portion of the terminal. 5 Methods of measurement 5.1 Antenna and r.f. parameters 5.1.1 Antenna performance Antenna gain, radiation pattern, and cross-polarization discrimination shall be measured as explained in the future IEC 835-3-2. Due to the fact that an SNG antenna is repeatedly assembled and disassembled in the course of the site installation, reproducibility of the antenna performance should be confirmed following disassembly and reassembly of the antenna. 5.1.2 Antenna alignment Adjustment of elevation angle, azimuth angle, and polarization plane at the site are required so as to