Page:United States Statutes at Large Volume 45 Part 2.djvu/1220

 2896 Aircraft statiooa. Appendix 8. 0btaining radlocom· pas.;; Learings. AIIU,p.28i8. General Instructions. Rules ofprocedure. I~TERNATIONAL RADIO CONVENTION. NOYEMBER 25, 1927. Documents wilfl, which aircraft 8tations must be provided Radio license. Certificate(s) of operator(s). Such documents as the competent agency of aeronautics of the country concerned shall, as circumstances may require, deem neces- sary to the station for the carrying on of its service. APPENDIX 8 Procedure for obtaining radiocompass bearings (See Art. 31 of the General Reculations) I. General instructions A. Before calling one or more radiocompass stations, the mobile station, in order to request its bearing, must refer to the nomen- clature for: 1. The call signals of the stations to be called to obtain the radiocompa.ss bearings desired. 2. The wave on which the radiocompass stations listen, and the wave or waves on which they take bearings. 3. The radiocompass stations which, connected by special wires, may be grouped with the radiocompass station to be called. 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 radiocompass 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 radiocompass stations concerned listen on the same wave, and if they are able to take bearin~s on a common wave-which may be a wave other than the listening wave- they should all be called together, in order that the bearings may be taken hy all these stations at the same time, on one and the same transmission. 3. If several radiocompH.ss stations are grouped by means of special wires, only one of them must be called even if all are furnished with transmitting apparatus. In this case, the mobile stations must, however, if it is necessary, specify in the call by means of the call signals, the radiocompass stR.tions whose bearings they wish to obtain. II. Rules of procedure A. Th9 mobile station shall call the radiocompass station or stations on the wave indicated in the nomenclature as being their listen- ing wave. It shall transmit the abbreviation QTE which means: "I wish to know my radiocompass bearing with respect to the radiocompass station which I am calling" or "I wish to know my radiocompass bearing with respect to the station or stations whose call signals follow" or "I wish to know my radiocompass bearing with respect to the radio compass stations grouped under your control" the call signal or signals necessaty, and shall close by indicating, if necessary, the wave which it is going to use to determine its bearing. It shall then await instructions.

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