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Documents of the CCIR (Oslo, 1966): Volume IV

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Documents of the CCIR (Oslo, 1966): Volume IV 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 DOCUMENTS OF THE Xlth PLENARY ASSEMBLY OSLO, 1966 VOLUME IV RADIO-RELAY SYSTEMS SPACE SYSTEMS RADIOASTRONOMY PART 2 : SPACE SYSTEMS, RADIOASTRONOMY Published by the . INTERNATIONAL TELECOMMUNICATION UNION GENEVA, 1967 March, 1969 ADDENDUM No. 1 to VOLUME IV OF THE DOCUMENTS OF THE Xlth PLENARY ASSEMBLY OF THE C.C.I.R. Oslo, 1966 Note by the Director, C.C.I.R. During the Interim Meetings of the Study Groups IV (Space systems and radioastronomy) and IX (Radio-relay systems), Geneva, 1968, it was decided that, owing to the urgency of commencing study of the problems contained therein, certain new Questions and Study Programmes should be submitted for adoption by correspondence, in accordance with Article 14, § 2(1) of the International Telecommunication Convention, Montreux, 1965. Each of these texts has received more than the twenty approvals necessary for their adoption from the Members and Associate Members of the I.T.U. and they have, in conse­ quence, now become official Questions and Study Programmes of the C.C.I.R. (see Adminis­ trative Circulars A.C./128 of 18 December, 1968 (Study Group IV) and A.C./129 of 15 January, 1969 (Study Group IX)). These texts are: — Questions 161IX and 17IIX, which are reproduced on separate sheets numbered 178a and 1786; — Question 19/IV, which is reproduced on separate sheets numbered 5806 and 580c; — Study Programme 3B/IX, which is reproduced on a separate sheet numbered 165a; — Study Programmes 2H/IV, 2J/IV, 18A/IV, 19 A/IV, which are reproduced on separate sheets numbered 5676 to 567d and 5806, 580<f and 580c. Two new texts concerning communication-satellite systems have been submitted by Adminis­ trations, for approval by correspondence, in accordance with Article 14, § 2(1) of the Inter­ national Telecommunication Convention, Montreux, 1965. These texts, having received more than the statutory minimum of twenty affirmative replies, have, in consequence, become an official Question and a Study Programme of the C.C.I.R. (see Administrative Circulars A.C./112 of 10 January, 1968 and A.C./114 of 9 April, 1968). These texts are: — Question 18/IV, which is reproduced on a separate sheet numbered 580a; — Study Programme 2G/IV, which is reproduced on separate sheets numbered 567a and 5676. Advantage has been taKen of the issue of this Addendum to notify the following corrections to Volume IV: Part 1 Page 96. In line 2 of “ recommends ”, replace “ * ” by “ ** ”. Part 2 Page 234. In title, replace “ Report 205-1 ” by “ Report 205-1 ”. _ 2 — Page 280. In line 5 of § 4.2, replace “ 30 dB ” by “ 300 dB ”. Page 295. In legend to Fig. 6, replace “ C ” by “ S ”. Page 410. In line 2 of § 6.2, replace “ space service ” by “ communication-satellite service Page 423. Replace the legend to Fig. 2 by: E = 32 - .25 log10 Holmdal Goonhilly Raisting Goldstone Mill Village Goonhilly (modified) Andover West Ford ” Page 425. Fig. 4, intervals on jc-axis are incorrectly spaced. Page 430. In Fig. 1, on abscissae, delete “ ThicKness of water layer (in.) ”. Page 431. In Fig. 2, on abscissae, delete “ ThicKness of water layer (in.) ”. — 165 a — STUDY PROGRAMME 3B/IX RADIO-RELAY SYSTEMS FOR TELEVISION Residues of signals outside the baseband (1969) The C.C.I.R., CONSIDERING (a) that it is desirable to set limits for the residues of signals outside the baseband in radio-relay systems for monochrome and colour television; (b) that these residues may be associated with the transmission of various types of signal, such as colour and sound sub-carriers and continuity pilots; (c) that, in suppressing these residues, it is important to avoid the introduction of excessive group-delay distortion in the baseband; (d) that this suppression can be expressed either as an absolute level or as an attenuation; decides that the following studies should be carried out: 1. determination of the appropriate limits for monochrome and colour television, for the residues corresponding to : 1.1 signals arising from non-linear distortion within the video-frequency band, in particular* those corresponding to harmonics of the colour sub-carrier(s); 1.2 continuity and other pilots; 1.3 signals corresponding to the frequency of the sound sub-carrier(s); 1.4 any other spurious signals; 2. desirability of expressing these limits as: — a level relative to the nominal peaK-to-peaK amplitude of the vision carrier, — an attenuation. — 178 a — QUESTION 16/IX RADIO-RELAY SYSTEMS FOR TELEVISION AND TELEPHONY Use of frequencies above about 12 GHz (1969) The C.C.I.R., CONSIDERING (a) that many demands may soon be made for the use of frequencies above about 12 GHz; (b) that special propagation problems exist at frequencies above 10 GHz; (c) that new technological developments are applicable to radio-relay systems operating at frequencies above about 12 GHz; decides that the following question should be studied: 1. what are the effects on radio-relay systems of the propagation characteristics of frequencies above about 12 GHz, operating wholly within the troposphere; 2. what are the preferred modulation techniques for use at frequencies above about 12 GHz for radio-relay systems; 3. what are the radio-frequency channel arrangements preferred for the frequency bands above about 12 GHz available for use by radio-relay systems? QUESTION 17/IX CRITERIA FOR FREQUENCY SHARING BETWEEN RADIO-RELAY SYSTEMS AND COMMUNICATION-SATELLITE SYSTEMS (1969) The C.C.I.R., considering (a) that radio-relay systems are now widely employed throughout the world and maKe extensive use of the radio-frequency spectrum; (b) that the use of radio-relay systems is expected to continue to expand and that new systems are expected to operate with improved performance and maKe more efficient use of the radio- frequency spectrum; 178 b (c) that the use of communication-satellite systems in the shared bands is expected to expand rapidly; (d) that the continued development of both services is desirable; (e) that control of mutual interference between stations of the two services is necessary; decides that the following question should be studied: 1. what levels of interference are acceptable and under what conditions do they apply to radio­ relay systems in order to facilitate sharing with communication-satellite systems; 2. what limitations are acceptable to radio-relay systems to facilitate the operation of earth station and space station receivers in a shared environment? — 567 a — STUDY PROGRAMME 2G/IV TECHNICAL CHARACTERISTICS OF COMMTJNICATION-SATELLITE SERVICE TO AIRCRAFT AND SHIPS (1968) The C.C.I.R., CONSIDERING (a) that there is a need for more reliable communication between distant land-based terminals and: — aircraft, — ships; (b) that the use of communication satellites promises to provide a service of sufficient reliability: (c) that communication with aircraft and ships may be required for the transmission of telephony or direct printing telegraphy (including data transmission) or both; (d) that in the interest of conservation of the radio frequency spectrum and to minimize the equipment which aircraft and ships carry, there might be overall merit in using the same frequency bands whether the aircraft or ship is communicating with a terrestrial station: — directly, — via a satellite; (e) that the use of common-spacecraft for mobile service to both aircraft and ships might well be advantageous, especially if the same order of frequency were to be suitable for both; (f) that important technical advantages, including those of frequency economy, might arise from the common use of satellites for both communication and navigation; decides that the following studies should be carried out: 1. the preferred types of orbit to provide satellite communication between land-based terminals and: 1.1 aircraft, 1.2 ships; 2. the preferred frequencies and technical characteristics for: 2.1 satellite-aircraft linKs, 2.2 satellite-ship linKs, 2.3 satellite-ground linKs; 3. the technical feasibility for communication-satellite services for aircraft and ships to share the use of common frequency bands: 3.1 one with the other, 3.2 with the terrestrial aeronautical mobile service, — 567 b — 3.3 with the terrestrial maritime mobile service, 3.4 with the terrestrial aeronautical and maritime radio-navigation services; 4. the technical feasibility of using a communication satellite also for a navigation service.
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