54 STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8, 1938 B. The procedure to be followed by the mobile station depends on varying circumstances. Generally, the following must be taken into account: 1. If the radio direction-finding stations do not listen on the same wave, whether it be the wave on which bearings are taken or another wave, the bearings must be requested separately from each station or group of stations using a given wave. 2. If all the radio direction-finding stations concerned listen on the same wave, and if they are able to take bearings on a common wave- which may be a wave other than the listening-wave-they must all be called together, in order that the bearings may be taken by all these stations at the same time, on one and the same transmission. 3. If several radio direction-finding stations are grouped by means of special wires, only one of them must be called, even if all are fur- nished with transmitting apparatus. In this case, the mobile station must, however, if it is necessary, specify in the call by means of the call signals, the radio direction-finding stations whose bearings it wishes to obtain. C. The data concerning: (a) the signal to be used to obtain the bearings, (b) the duration of the transmission to be made by the mobile station, and (c) the time used by the radio direction-finding station in question, shall be given in the nomenclature. II. Rules of Procedure A. TO OBTAIN A BEARING (1) The mobile station shall call the radio direction-finding sta- tion on the wave indicated, in the nomenclature, as being its watch- ing-wave. The station calling shall transmit the abbreviation QTE ? (followed, if the radio direction-finding station is a mobile station, by the abbreviation QTH ?) and indicate, if necessary, the wave it is going to use to have a bearing determined. The station calling shall then await instructions. (2) The radio direction-finding station called shall direct the call- ing station to transmit. (3) After having prepared its new transmitting wave, wherever this is required, the calling station shall reply by sending its call signal sometimes combined with another signal, during a length of time sufficiently prolonged to take the bearing. (4) The radio direction-finding station shall determine the direc- tion and, if possible, the sense of the bearing, and transmit the infor- mation to the calling station in the following order: (a) the abbreviation QTE; (b) the true bearing in degrees from the radio direction-finding station; (c) the time of observation; (d) if the radio direction-finding station is a mobile station, its own position in latitude and longitude, preceded by the abbreviation QTH. 1647
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