Page:United States Statutes at Large Volume 49 Part 2.djvu/495

TELECOMMUNICATION CONVENTION. DECEMBER 9,1932. [301] § 4. The CQ call not followed by the letter K (general call to all stations without request for reply) shall be used before transmis- sion of information of all kinds intended to be read or used by pnyone who can receive it. ARTICLE 18 Galling [300] § 1. (1) As a general rule, it shall devolve upon the mobile station to establish communication with the land station. It may call the land station for this purpose only after having arrived within the range of the latter. [310] (2) However, a land station having traffic for a mobile station which has not indicated its presence may call the latter if it has reason to assume that the said mobile station is within its range and is listening. [311] § 2. (1) Furthermore, land stations may transmit their calls in the form of "lists of calls" consisting of the call signals of all mo- bile stations for which they have traffic on hand, at definite intervals, at least 2 hours apart, which have been established by agreements between the governments concerned. Land stations which transmit their calls on the wave of 500 kc (600 m) shall transmit them in the form of "lists of calls", in alphabetical order, to include only the call signals of mobile stations for which they have traffic on hand and which are within their range. To their own call signal they shall add the abbreviations to indicate the working-wave they wish to use in the transmission. Land stations which use continuous waves outside of the band of 365 to 515 kc (822 to 583 m) shall trans- mit the call signals in the order which is most convenient for them. [312] (2) The time at which land stations transmit their lists of calls, as well as the frequencies and types of waves which they use for this purpose must be indicated in the nomenclature. [313] (3) :Mobile stations which, during this transmission, hear their call signal, must answer as soon as they can, following, so far as possible, the order in which they were called. [314] (4) When the traffic cannot be disposed of immediately, the land station shall inform each mobile station concerned of the probable time at which the work can begin, as well as the frequency and the type of wave which will be used in the work with it, if this is necessary. [315] § 3. When a land station receives calls from several mobile sta- tions at practically the same time, it shall decide as to the order in which these stations may transmit their traffic to it, its decision being based only on the necessity for permitting each calling station to exchange with it the greatest possible number of radiotelegrams. CaJUn, . 2511