1498 INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [55 STAT. b) that it would be desirable to have supplementary data regarding the radio needs of the aeronautical services in the Western Hemisphere; recommends: 1.- that a study should be made with a view of obtaining at the earliest practicable date a reasonable number of additional channels for the aeronautical services, should these additional channels be found necessary; 2.- that to this end the countries participating in this Conference should prepare and exchange before March 1, 1941, all pertinent data which may be of value in formulating definite proposals for consideration at the next International Telecommunications Conference. XII DIVISION OF TIME IN THE USE OF ROUTE FREQUENCIES Considering: that the Inter-continental Route Frequencies are for the joint use by aircraft and aeronautical stations of all countries and MSt. 1417. the General Radio Regulations of Cairo do not as yet cover all phases of radio operating procedures in the aeronautical serv- ices, such as division of operating time in the use of route frequencies; it is recommended: that a study be made to determine what additional radio regu- lations should be prescribed for the international aeronautical services; that any additional radio regulations for the aeronautical services be coordinated with the existing regulations both inter- national and of each individual nation governing the mobile services in general. XIII STABILIZED TRANSMITTING FREQUENCIES IN THE VARIOUS BANDS Considering: 4Stat. 1417. 1.- that the new tolerances fixed by the General Regulations of Cairo will probably require the employment of automatic frequency control devices; 2.- that the possible use of all the frequencies designated in each band for each intercontinental line would necessitate the provision of a large number of frequencies; it is recommended: a) that as a temporary measure, aircraft transmitters should, if necessary, be capable of transmitting on two fixed frequencies in each band; b) that information be exchanged on the methods employed to attain the necessary stability requirements.
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