Page:United States Statutes at Large Volume 49 Part 2.djvu/627

 TELECOMMUXICATIOX CONVENTION. DECEMBER 9. 1932. "I wish to know my radio direction-finding bearing with respect to the station or stations whose call signals follow." or "I wish to know my radio direction-finding bearing with re- spect to the radio direction-finding stations grouped under your control," the necessary call signal or signals, and shall conclude by indicating, if necessary, the wave which it is going to use to have its bearing determined. It shall then await instructions. B. The radio direction-finding station or stations called shall prepare to take the bearing; they shall, if necessary, notify the radio direction-finding stations with which they are connected. As soon as the radio direction-finding stations are ready, such of these stations as are provided with transmitters shall reply to the mobile station in the alphabetical order of their call signals, by giving their cull signal followed by the letter K. In the case of radio direction-finding stations which are grouped, the station called shall notify the other stations of the group and shall inform the mobile station as soon as the stations of the group are ready to take the bearing. C. After having prepared. its new transmitting wave, wherever this is required, the mobile station shall reply by sending its call signal sometimes combined with another signal, during a length of time sufficiently prolonged to take the bearing. D. The radio direction-finding station or stations which are satis- fied with the operation shall transmit the signal QTE (" Your true bearing with respect to me was ... degrees "), preceded by the time of the observation and followed by a group of three figures (000 to 359), showing in degrees the true bearing of the mobile station with respect to the radio direction-finding station. If a radio direction-finding station is not satisfied with the opera- tion, it shall request the mobile station to repeat the transmission indicated under C. E. As soon as the mobile station has received the result of the ob- servation, it shall repeat the message to the radio direction-finding station, which shall then state that the repetition is correct or, when necessary, shall correct it by repeating the message. When the radio direction-finding station is certain that the mobile station has received the message correctly, it shall transmit the signal "end of work". This signal shall then be repeated by the mobile station, as an indication that the operation is completed. F. 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. 2643