Page:United States Statutes at Large Volume 55 Part 2.djvu/625

 1499 55 STAT.] INTER-AMERICAN-RADIO COMMUNICATIONS-JAN. 26, 1940 XIV AIRCRAFT RADIO EQUIPMENT (GENERAL). Considering: that the joint use of the Intercontinental Route Frequencies introduces new problems of equipment design because of the necessarily more rigid tolerances governing such regulatory matters as frequency stability, band-change, quick frequency shift, etc. it is recommended: that the competent aeronautical and radio consultative bodies be asked to prepare appropriate technical and performance recommendations in all matters upon which standardization appears to be desirable and practicable such as for example: a) Minimum number of frequency bands which should be covered by aircraft radio equipment and a study of the specific frequency bands to be covered. b) Minimum number of stabilized frequencies which should be provided. c) Band-change and frequency-change requirements. d) Transmitter and receiver calibration standardization. e) Minimum transmitter power and receiver sensitivity. XV RADIO EQUIPMENT FOR AERONAUTICAL CONTROL STATIONS It is recommended: a) that a study be made of the minimum radio facilities for control stations of air navigation serving the inter-continental air routes; b) that there be undertaken an exchange of all information relative to existing installations at each base. XVI RADIO AIDS TO AIR NAVIGATION. STANDARDS OF FIELD STRENGTH AND INTERFERENCE RATIOS. The Second Inter-American Radio Conference resolves: 1.- that the countries of the Western Hemisphere should exchange all available pertinent data on the following subjects: a) Lists of various types of radio aids to air navigation which have been approved for service operation. b) Information on minimum signal intensities required for satisfactory reception of the various types of radio aids to air navigation.

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