SANS 10061-2-2008 The installation of communal and single antenna systems for the reception of television and sound broadcast transmissions Part 2 Satellite antenna systems《电视及声音广播.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-20494-5 SANS 10061-2:2008Edition 1.1 Any reference to SABS 061-2 is deemedto be a reference to this standard(Government Notice No. 1373 of

4、 8 November 2002)SOUTH AFRICAN NATIONAL STANDARD The installation of communal and single antenna systems for the reception of television and sound broadcast transmissions Part 2: Satellite antenna systems WARNING Can only be used in conjunction with SANS 10061-1. Published by Standards South Africa

5、1 dr lategan road groenkloof private bag x191 pretoria 0001 tel: 012 428 7911 fax: 012 344 1568 international code + 27 12 www.stansa.co.za Standards South Africa SANS 10061-2:2008 Edition 1.1 Table of changes Change No. Date Scope Amdt 1 2008 Amended to change the designation of SABS standards to S

6、ANS standards, to include information on relevant legislation, and to correct “antennae“, wherever it occurs, to read “antennas“. Acknowledgement The South African Bureau of Standards wishes to acknowledge the valuable assistance derived from publications of the following organizations: British Stan

7、dards Institution International Electrotechnical Commission Foreword This South African standard was approved by National Committee StanSA TC 74, Communication technology, in accordance with procedures of Standards South Africa, in compliance with annex 3 of the WTO/TBT agreement. This document was

8、published in May 2008. This document supersedes SABS 061-2:1994 (edition 1). A reference is made in 4.2 to “legal requirements“. In South Africa this means The application of the National Building Regulations (SANS 10400) and The wiring of premises Part 1: Low-voltage installations (SANS 10142-1). S

9、ANS 10061 consists of the following parts under the general title The installation of communal and single antenna systems for the reception of television and sound broadcast transmissions: Part 1: VHF and UHF television and VHF sound antenna systems. Part 2: Satellite antenna systems. SANS 10061-2:2

10、008 Edition 1.1 1 Contents Page Acknowledgement Foreword 1 Scope . 3 2 Normative references 3 3 Definitions 4 4 General installation requirements 4 4.1 Suitability of site 4 4.2 Legal requirements 4 5 Mechanical and electrical safety 4 5.1 General 4 5.2 Materials and protection 4 5.3 Mounting 4 5.4

11、Safety earthing and protection against atmospheric electricity . 5 5.5 Cable and cabling 5 5.6 Conduit and ducting 5 6 Outlet sockets 5 6.1 General 5 6.2 Dielectric strength 5 7 Distribution systems . 6 8 Antennas 6 8.1 Antenna selection 6 8.2 Siting of antennas 6 8.3 Impedance . 6 9 Signals . 6 9.1

12、 Signal levels 6 9.2 Grades of impairment 6 10 Information to be provided to the user . 9 Figures 1 and 2 7-8 Bibliography 9 Amdt 1 SANS 10061-2:2008 Edition 1.1 2 This page is intentionally left blank SANS 10061-2:2008 Edition 1.1 3 The installation of communal and single antenna systems for the re

13、ception of television and sound broadcast transmissions Part 2: Satellite antenna systems 1 Scope This part of SANS 10061 establishes principles for the installation of communal and single antenna systems for the reception of signals in the frequency range 11,2 GHz to 12,7 GHz from orbiting satellit

14、es. It includes the protection of such systems against atmospheric electrical disturbances. Associated receiving equipment is also covered. NOTE See also the NOTE to 1.1 of SANS 10061-1. 2 Normative references The following standards contain provisions which, through reference in this text, constitu

15、te provisions of this part of SANS 10061. All standards are subject to revision and, since any reference to a standard is deemed to be a reference to the latest edition of that standard, parties to agreements based on this part of SANS 10061 are encouraged to take steps to ensure the use of the most

16、 recent editions of the standards indicated below. Information on currently valid national and international standards may be obtained from Standards South Africa. SANS 1200 HC (SABS 1200 HC), Standardized specification for civil engineering construction Section HC: Corrosion protection of structura

17、l steelwork. SANS 1611, The mechanical requirements for satellite television receiving antennas. SANS 10061-1, The installation of communal and single antenna systems for the reception of television and sound broadcast transmissions Part 1: VHF and UHF television and VHF sound antenna systems. SANS

18、60065/IEC 60065, Audio, video and similar electronic apparatus Safety requirements. SANS 10061-2:2008 Edition 1.1 4 3 Definitions For the purposes of this part of SANS 10061, the relevant definitions given in SANS 10061-1 apply. 4 General installation requirements 4.1 Suitability of site It is the r

19、esponsibility of the installer to ensure that the proposed site is suitable with respect to reception conditions, aesthetic considerations and the possible presence of terrestrial interference, and that the proposed installation complies with the purchasers requirements. NOTE Directional parameters

20、of satellites may be changed at any time by the operators and the site and installation should therefore provide adequate east-west coverage. 4.2 Legal requirements It is the responsibility of the installer (or of the owner, as agreed upon) to ensure that the proposed installation complies with any

21、relevant legal requirements (see foreword). Amdt 1 5 Mechanical and electrical safety 5.1 General Ensure that each part of the antenna(s) and of any outdoor component of the installation is adequately protected from deterioration that might be caused by the most adverse weather conditions to which t

22、he part could be exposed. 5.2 Materials and protection For information on which materials to use and on corrosion tests, see annex A of SANS 10061-1. Ensure that structural steelwork is protected in accordance with SANS 1200 HC. 5.3 Mounting 5.3.1 Mechanical stress It is the responsibility of the in

23、staller to ensure that the antenna, when mounted, can withstand the stresses resulting from the mass-loads and wind loads to which it will be subjected (see annex E of SANS 10061-1). Where an antenna that has a reflector with a major axis of 1,5 m or greater is mounted on a building or other structu

24、re that raises the antenna significantly above ground level, ensure that safety chains are fitted. In such cases, consult a qualified structural engineer on the method of mounting to be used and ensure that the engineer gives written approval of the installation. Ensure that an antenna system is not

25、 installed where an explosive or flammable atmosphere is likely to be present. NOTE In all cases, the manufacturers recommendations for mounting should be followed. SANS 10061-2:2008 Edition 1.1 5 5.3.2 Protection of joints Subclause 6.2.2.3 of SANS 10061-1 shall apply. Where the mounting of the ant

26、enna incorporates movable joints, the sections of the mounting on each side of the joint shall be bonded together with a flexible strap that has a current rating of at least 30 A. 5.4 Safety earthing and protection against atmospheric electricity 5.4.1 General Subclause 6.2.3.1 of SANS 10061-1 shall

27、 apply. 5.4.2 Cable installation Subclause 6.2.3.2 of SANS 10061-1 shall apply. 5.4.3 Safety of amplifiers and other devices Ensure that a) all electrically operated devices such as amplifiers, low noise block receivers (LNBs) and scanning motors comply with the relevant requirements of SANS 60065,

28、and b) if an amplifier has a safety earth terminal, the terminal is connected to the antenna earthing system. Alternatively, the earth lead of the mains plug on the amplifier may be used, where this does not introduce interference into the system. 5.5 Cable and cabling Subclauses 5.8 and 6.3 of SANS

29、 10061-1 shall apply. 5.6 Conduit and ducting Subclause 6.4 of SANS 10061-1 shall apply. 6 Outlet sockets 6.1 General 6.1.1 Ensure that the LNB is terminated with a female “F“ type socket in a fixed housing and is suitably labelled to identify its function. 6.1.2 Where the frequency is down-converte

30、d to VHF or UHF, ensure that the outlet socket complies with 5.9 of SANS 10061-1 and that it is suitably labelled to identify its function. 6.2 Dielectric strength Subclause 5.9.2 of SANS 10061-1 shall apply. SANS 10061-2:2008 Edition 1.1 6 7 Distribution systems Subclauses 5.2 (other than 5.2.4 and

31、 5.2.5) and 5.4 of SANS 10061-1 shall apply. 8 Antennas Amdt 1 8.1 Antenna selection Ensure that the antenna complies with the requirements of SANS 1611. 8.2 Siting of antennas Amdt 1 Use suitable equipment to ensure that the optimum receivable signal is obtained by adjusting the elevation, the azim

32、uth and the polarization. Use a suitable satellite receiver to establish the best orientation for the antenna. Keep the antenna as clear from obstruction as possible so that there is a clear “view“ of the transmitting satellites. 8.3 Impedance Ensure that the LNB and cable have a nominal impedance o

33、f 75 . 9 Signals 9.1 Signal levels Figure 1 gives the signal strength footprint for South African television transmissions from Ku-band satellite PanAmSat (PAS-4 72E). Figure 2 shows the elevation angles in South Africa for satellite PanAmSat (PAS-4 72E). At the time of installation, the installer s

34、hould record signal level measurements under normal operating conditions. In the case of communal systems, ensure that the outlet socket voltages from the satellite receiver comply with the relevant requirements of 4.7.2 and 4.7.3 of SANS 10061-1. 9.2 Grades of impairment The installer should aim to

35、 achieve a minimum grade of impairment of 4, from the grades of impairment given in table 1. Table 1 Grades of impairment 1 2 3 Quality Grade1)Impairment Excellent 5 Imperceptible Good 4 Perceptible but not annoying Fair 3 Slightly annoying Poor 2 Annoying Bad 1 Very annoying 1) CCIR 5-point scale.

36、At the time of installation, the installer should record the assessed grade of impairment under normal operating conditions. SANS 10061-2:2008 Edition 1.1 7 If the assessed grade is less than 4, the acceptance of the picture and sound quality by the user should be obtained in writing. Figure 1 Ku-ba

37、nd satellite coverage (footprint) PanAmSat (PAS-4 72E) SANS 10061-2:2008 Edition 1.1 8 Figure 2 Elevation angles for satellite PanAmSat (PAS-4 72E) SANS 10061-2:2008 Edition 1.1 9 10 Information to be provided to the user The installer should provide the user with the following information, at the c

38、ompletion of the installation and on the acceptance by the user: NOTE In the case of a communal system, the user may be a body corporate. a) the name and address of the installer and the address, if other than that of the installer, from which service or service information is available and, in the

39、case of a communal system, details of the cable layout and circuit arrangement; b) adequate instructions for the operation of the system; c) a signed warranty that the system complies with all the relevant provisions of this part of SANS 10061; d) the grade of impairment and signal level achieved fo

40、r each frequency for which the system has been designed; and e) where local regulations apply, written confirmation that the installation complies with those regulations. Bibliography SANS 10142-1, The wiring of premises Part 1: Low voltage installations. Amdt 1 SANS 10400, The application of the National Building Regulations. Amdt 1 Standards South Africa Amdt 1