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Documents of the CCIR (Oslo, 1966): Volume 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 III FIXED AND MOBILE SERVICES STANDARD-FREQUENCIES AND TIME-SIGNALS MONITORING OF EMISSIONS Published by the INTERNATIONAL TELECOMMUNICATION UNION GENEVA, 1967 March, 1969 ADDENDUM No. 1 to VOLUME III OF THE DOCUMENTS OF THE Xlth PLENARY ASSEMBLY OF THE C.C.I.R. Oslo, 1966 Note by the Director, C.C.LR. 1. During the Special Meeting of Study Group XIII (Mobile services), Geneva, 1967, the Interim Meetings’ of Study Groups VII (Standard-frequencies and time-signals) and VIII (International monitoring), Boulder, Colorado, 1968 and the Interim Meeting of Study Group XIII, Geneva, 1968, it was decided that, in view of the urgency of commencing work on the problems involved, certain Draft Questions and Study Programmes should be circulated to Administrations for approval by correspondence, in accordance with Article 14, § 2(1) of the International Tele­ communication Convention, Montreux, 1965. Each of the texts submitted 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./124 of 7 November, 1968 and A.C./126 of 25 November, 1968 (Study Groups VII and VIII) and A.C./106 of 4 August, 1967 and A.C./128 of 18 December, 1968 (Study Group XIII)). These texts are: — Question 5/VII, which is reproduced on a separate sheet numbered 318; — Question 2-1 /VIII, which is reproduced on a separate sheet numbered 426a; — Questions 9/XIII, 10/XIII, 11/X III and 12/XIII, which are reproduced on separate sheets numbered 270a to 270c; — Study Programmes 2-1A/XIII and 6A/XIII, which are reproduced on separate sheets numbered 426a, 426b and 265a. 2. The text of Question 2-1/VIII is intended to replace the existing text of Question 2/VIII, which will be recommended for deletion to the X llth Plenary Assembly. 3. One Administration, while approving the text of Question 12/XIII, recommends that the words “ without speech ” should be deleted from the text in the footnote. This proposition will be discussed at the next meeting of Study Group XIII. 4. Advantage has been taken of the issue of this Addendum to notify the following corrections to Volume III: Page 10. In the list, replace “ Recommendation 429 ” by “ Recommendation 429-1 ”. Page 146. Replace equation (2) by: UP'= P 0 t'o<Po/K’\ Page 147. Replace equation (3) by: “ G' = qPo/P' = qK/()'o9o ”• In paragraph 6, replace “ asuumed ” by “ assumed — 2 — Page 148. The paragraph “ For distances less ............ over the route ” should follow the expression 4m = vertical (degrees) ”. Page 149. In Fig. 1, on the axis of ordinates, replace “ 110 ” by “ 200 ”. Page 291. Concerns the French text only. Page 326. In the figure the words “ Resolving power ” should be removed from the axis of ordinates and replaced above the “ -< • >- ” at the top. Page 327. Concerns the French text only. Page 381. In the 7th line of § 4.1.3, replace “ Report 275-1 ” by “ Report 279-1 Page 414. In Fig./3, insert “ E-plane ” over the left-hand figures and “ H-plane ” over the right-hand figures. 265 a STUDY PROGRAMME 6A/XIII SELF-SUPPORTING ANTENNAE FOR USE ON BOARD SHIPS Performance at 500 kHz (1967) The C.C.I.R., CONSIDERING (a) that there are now radically different physical and electrical configurations of self-supporting antennae as compared with the 500 kHz antennae to which Chapter IV, Regulation 9, § (g), of the International Convention for the Safety of Life at Sea, 1960, was intended to apply;. (b) that to provide an adequate answer to Question 6/XIII, additional data are needed as to the design, installation and performance of self-supporting antennae, in order that a proposal might be made for modification of Regulation 9, § (g), to be applicable to self-supporting antennae, while ensuring that such installations will meet the minimum normal ranges specified for ship stations; d ecid es that the following studies should be carried out: data on performance of self-supporting antennae should be collected and communicated to the Director, C.C.I.R.: 1. Description 1.1 Characteristics and dimensions of antennae as mounted on board ship, e.g. overall height above deepest load line, etc., including simple diagrammatic sketches where appropriate; 1.2 design criteria for base insulator (physical and electrical characteristics, e.g. shunt capacitance,, physical dimensions, material, etc.), top loading and loading coil, if any; 2. Performance 2.1 Current, as measured with class of emission A0; 2.1.1 current delivered to the antenna system by the transmitter; 2.1.2 current at the base of the antenna; 2.2 Capacitance of the antenna system as seen from the transmitter (at approximately 500 kHz);. 2.3 field strength measured over sea water at a distance of at least three nautical miles and adjusted to a reference value at one nautical mile in accordance with Recommendation 368; 2.4 weather conditions on board ship during the measurements; 3. Installation details, for example : 3.1 location on ship; 3.2 separation from nearby objects; 3.3 protection from adverse weather effects. — 270 a — QUESTION 9/XIII SELECTIVE-CALLING SYSTEM FOR FUTURE OPERATIONAL REQUIREMENTS OF THE MARITIME MOBILE SERVICES (1967) The C.C.I.R., CONSIDERING (a) that draft Recommendation D.a * in answer to Question 3/XIII meets the immediate opera­ tional requirements of certain Administrations; (b) that future operational requirements may necessitate the development of different types of selective calling system; d e c id e s that the following question should be studied: 1. what are the operational requirements for selective calling that may be necessary for future maritime communication systems; 2. what other information, in conjunction with the selective call, may be required for the opera­ tion of future maritime communication systems; 3. what are the best means for meeting these requirements bearing in mind the technical and economic factors and the need for frequency spectrum conservation? QUESTION 10/XIII REDUCTION OF FREQUENCY SEPARATION BETWEEN ADJACENT CHANNELS IN THE VHF (METRIC) MARITIME-MOBILE BAND (1967) The C.C.I.R., CONSIDERING (a) that the use of the VHF (156-174 MHz) band by the maritime-mobile service is increasing; (b) that, as a result, an increased number of channels may be necessary; (c) that the number of channels available for assignment may be increased by reducing the fre­ quency separation between adjacent channels; * See the Conclusions of the Special Meeting of Study Group XIII, Geneva, 1967. 270 b (d) that, as there are already in operation a large number of equipments conforming to Recom­ mendation 425, any reduction in frequency separation between adjacent channels needs to be considered, not only as regards technical characteristics but also as regards interference to existing services; d e c id e s that the following question should be studied: 1. if the frequency separation between adjacent channels be reduced to 25 kHz, what should be the technical characteristics of the equipment and what would be the effects on the performance of the radiotelephone system; 2. what special measures would need to be taken to introduce the new frequency separation between adjacent channels with the minimum adverse effect on existing services ? QUESTION 11/XIII IMPROVEMENTS IN THE PERFORMANCE OF RADIOTELEPHONE CIRCUITS IN THE MF AND HF MARITIME BANDS (1968) The C.C.I.R., CONSIDERING (a) that there is a need to improve the quality of transmission of MF and HF maritime radio­ telephone circuits; (b) that the adoption of new compandor principles which have recently become available might offer the prospect of such an improvement; d e c id e s that the following question should be studied: 1. what are the methods by which compandor techniques can be applied to maritime radio­ telephone circuits in the MF and HF bands; 2. what improvement in performance is to be expected with these techniques; 3. what characteristics would need to be agreed if such a technique were adopted; 4. what changes, if any, would need to be made to the tolerances of existing equipment, etc. to satisfactorily apply such techniques; 5. what measures should be taken to provide compatible operations between stations utilizing
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