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Documents of the CCIR This electronic version (PDF) was scanned by the International Telecommunication Union (ITU) Library & Archives Service from an original paper document in the ITU Library & Archives collections. La présente version électronique (PDF) a été numérisée par le Service de la bibliothèque et des archives de l'Union internationale des télécommunications (UIT) à partir d'un document papier original des collections de ce service. Esta versión electrónica (PDF) ha sido escaneada por el Servicio de Biblioteca y Archivos de la Unión Internacional de Telecomunicaciones (UIT) a partir de un documento impreso original de las colecciones del Servicio de Biblioteca y Archivos de la UIT. (ITU) ﻟﻼﺗﺼﺎﻻﺕ ﺍﻟﺪﻭﻟﻲ ﺍﻻﺗﺤﺎﺩ ﻓﻲ ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﺍﻟﻤﻜﺘﺒﺔ ﻗﺴﻢ ﺃﺟﺮﺍﻩ ﺍﻟﻀﻮﺋﻲ ﺑﺎﻟﻤﺴﺢ ﺗﺼﻮﻳﺮ ﻧﺘﺎﺝ (PDF) ﺍﻹﻟﻜﺘﺮﻭﻧﻴﺔ ﺍﻟﻨﺴﺨﺔ ﻫﺬﻩ .ﻭﺍﻟﻤﺤﻔﻮﻇﺎﺕ ﺍﻟﻤﻜﺘﺒﺔ ﻗﺴﻢ ﻓﻲ ﺍﻟﻤﺘﻮﻓﺮﺓ ﺍﻟﻮﺛﺎﺋﻖ ﺿﻤﻦ ﺃﺻﻠﻴﺔ ﻭﺭﻗﻴﺔ ﻭﺛﻴﻘﺔ ﻣﻦ ﻧﻘﻼ ً◌ 此电子版（PDF版本）由国际电信联盟（ITU）图书馆和档案室利用存于该处的纸质文件扫描提供。 Настоящий электронный вариант (PDF) был подготовлен в библиотечно-архивной службе Международного союза электросвязи путем сканирования исходного документа в бумажной форме из библиотечно-архивной службы МСЭ. © International Telecommunication Union INTERNATIONAL RADIO CONSULTATIVE COMMITTEE C.C.I.R. Xllth PLENARY ASSEMBLY NEW DELHI, 1970 VOLUME IV PART 2 FIXED SERVICE USING COMMUNICATION SATELLITES (STUDY GROUP 4) SPACE RESEARCH AND RADIOASTRONOMY (STUDY GROUP 2) Published by the INTERNATIONAL TELECOMMUNICATION UNION GENEVA, 1970 COVERING NOTE GENERAL SECRETARIAT INTERNATIONAL TELECOMMUNICATION UNION Subject: Documents of the J“ly 1973 X H t h Plenary Assembly of the C.C.I.R. New Delhi - 1970 Addendum No. 1 to Volume IV Please find attached Addendum No. 1 to Volume IV, in English. O.I.T. Union internationals des telecommunications 1211 GENEVE 20 Suteae - Switzerland - Suize June, 1973 ADDENDUM No. 1 to VOLUME IV Xllth PLENARY ASSEMBLY OF THE C.C.I.R. New Delhi, 1970 Note by the Director, C.C.I.R. Subsequent to the publication of Volume IV of the documents of the Xllth Plenary Assembly of the C.C.I.R., new texts concerning the fixed service using radio-relay systems, the fixed service using communication satellites and space research have become official texts of the C.C.I.R. According to the procedure applied for these texts to be recognized as official C.C.I.R. texts, they are divided into three groups: 1. New subjects for study requested by the World Administrative Radio Conference for Space Telecommunications, Geneva, 1971, in conformity with the provisions of No. 190 of the International Telecommunication Convention, Montreux, 1965. These subjects resulted in the preparation of new Questions by Study Groups 4 and 9 at their interim meeting in Geneva, 1972. They are as follows: — Question 22/4, the text of which is reproduced on a separate sheet numbered 259 a (to be included in Part 2); — Questions 18/9, 19/9 and 20/9, the texts of which are reproduced on separate sheets numbered 242 a and 242 b (to be included in Part 1). 2. New texts submitted with a view to adoption by correspondence, under No. 190 of the International Telecommunication Convention, Montreux, 1965. These texts have received more than the twenty approvals required for their adoption by the Members of the I.T.U., and have become official Questions of the C.C.I.R. They are as follows: — Questions 13/2 and 14/2, the texts of .which are reproduced on separate sheets num­ bered 466 a and 466 b (to be included in Part 2). 3. New Study Programmes adopted by Study Group 4 at the interim meeting held in Geneva from 5 to 21 July, 1972. These texts were adopted in conformity with § 2.7.2 of C.C.I.R. Resolution 24-2, according to which each Study Group may approve, if it deems it necessary, draft Study Programmes derived from existing Questions. These texts are as follows: — Study Programmes 1-1 A/4, 2-1K/4 and 2-1L/4, which are reproduced on separate sheets numbered 245 a for the first one, and 254 a and 254 b for the last two (to be included in Part 2). — 242 a — QUESTION 18/9 INTERFERENCE CRITERIA FOR RADIO-RELAY SYSTEMS (1972) The C.C.I.R., considering (a) that it is desirable to determine the characteristics of interference by which any emission, radiation or induction affects a radio-relay system beyond specific limits established to ensure the quality and reliability of performance required by the nature of the service; (b) that the assessment of the level of interference is related to various factors such as the nature of the service concerned, number of interference sources, percentages of time during which the interfering signal affects the wanted signal; (c) that the maximum allowable values of interference from communication-satellite systems are given in Recommendation 357-1 *; (d) that the definitions of the terms “acceptable (or unacceptable) interference” and “harmful interference” are being studied elsewhere as general definitions, for use in C.C.I.R. (Recom­ mendation No. Spa2 - 12 and Recommendation No. Spa2 - 15, § 2.12, Geneva, 1971); decides that the following question should be studied: what are the values of interference appropriate to the terms “acceptable (or unacceptable) interference” and “harmful interference” for the various types of service provided by radio­ relay systems? QUESTION 19/9 LIMITATION OF SPURIOUS EMISSIONS AND FREQUENCY TOLERANCES OF RADIO-RELAY SYSTEMS (1972) The C.C.I.R., CONSIDERING § 2.4 of Recommendation No. Spa2 - 15 of the WARC-ST, Geneva, 1971; decides that the following question should be studied: what is the necessary limitation of spurious emissions and the frequency tolerances to be observed in radio-relay systems in so far as they may affect sharing of frequency bands with other systems? * The revision of this Recommendation was proposed at the interim meeting of Study Groups 4 and 9, but the maximum allowable values of interference from communication-satellite systems were not thereby affected. Addendum No. I to Volume IV, part 1, XUth P.A. of the C.C.I.R., New Delhi, 1970 — 242 b — QUESTION 20/9 * TRANSPORTABLE FIXED SERVICE RADIOCOMMUNICATION EQUIPMENT FOR RELIEF OPERATIONS (1972) The C.C.I.R.; CONSIDERING (a) that rapid and reliable telecommunications are essential for relief operations in the event of natural disasters, epidemics, famines and similar emergencies; (b) that, through damage or from other causes, the normal telecommunications facilities in disaster areas are often inadequate for relief operations and cannot be restored or supple­ mented quickly through local resources; (c) that the World Administrative Radio Conference for Space Telecommunications (Geneva, 1971) has adopted Recommendation No. Spa2 - 13; decides that the following question‘should be studied: what are the preferred characteristics and frequency bands for transportable radio-relay equipment to provide relief telecommunication when: — the equipment is used to establish terrestrial access.to a transportable earth station; — only terrestrial relief telecommunication facilities are involved? * See also Questions 22/3, 22/4 and 22/8. Addendum No. 1 to Volume IV, part 1, Xllth P.A. of the C.C.I.R., New Delhi, 1970 — 245 a — STUDY PROGRAMME 1-1A/4 RADIATION DIAGRAMS OF ANTENNAE AT EARTH STATIONS IN THE FIXED-SATELLITE SERVICE (1972) The C.C.I.R., CONSIDERING (a) that the side lobe characteristics of antennae for earth stations will affect the level of inter­ ference between the fixed-satellite services and terrestrial systems in shared frequency bands and also the efficiency of utilization of the geostationary satellite orbit; (b) that the majority of earth stations in the existing fixed-satellite services employ antennae of large diameter to wavelength ratio (D/A) and that important but incomplete data con­ cerning such antenna radiation patterns are already available; (c) that in the future earth stations in the fixed-satellite service systems may employ antennae of relatively small D/A; decides that the following studies should be carried out: 1. determination of a reference radiation pattern for coordination studies and the calculation of interference between fixed-satellite systems, and between earth stations of such systems and stations of other services (Note 1); 2. determination of a design objective for new antennae with side lobe levels as low as practic­ able (Note 2). Note 1. — To do this in a statistically significant and convincing manner a great deal of information on antenna far field side lobes is needed. This information should cover a representative range of antenna types over a wide range of D/A and operating frequencies. Measurement conditions and uncertainties should be stated. Note 2. — Since one of the main aims is to improve utilization of the geostationary satellite orbit a high degree of suppression of radiation a few degrees off-beam is of particular importance. The design objective should be based on: — the analysis of measurements of the side lobe peaks of new earth station antennae, where these show a high degree of side lobe suppression; these measurements should be, made in the far field with adequate ground clearance. The uncertainty associated with the measurements should be stated; — the analysis of available studies for proposed antenna types where these aim at a high degree of side lobe suppression. Addendum No. I to Volume IV, part 2, XUth P.A. of the C.C.I.R., New Delhi, 1970 — 254 a — STUDY PROGRAMME 2-1K/4 CHARACTERISTICS OF AN EARTH-TO-SPACE PATH OF THE FIXED SATELLITE SERVICE USED FOR THE CONNECTION OF A SATELLITE IN THE BROADCASTING SERVICE (1972) The C.C.r.R., CONSIDERING (a) that under the Radio Regulations the Earth-to-space path used for the connection of a satellite in the broadcasting servicfe is part of the fixed-satellite service; (b) that the frequency and technical characteristics of this path may depend on the technical characteristics of the broadcasting satellite, but that risks of interference with satellites in the fixed-satellite service providing links between specified points on the Earth should also be taken into account; (c) that certain frequency bands are allocated to the fixed-satellite service in both the Earth- to-space and the space-to-Earth directions; decides that the following studies should-be carried out: 1.
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