Page:United States Statutes at Large Volume 54 Part 2.djvu/1301

 2522 49 Stat. 2585; ante, p. 1589. Ante, p. 1589. INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [54 STAT. c) that it is desirable to have supplementary data for the tolerances and instabilities that can be applied in current practice, particularly on frequencies higher than 23000 Kc/s., which may become the subject of international regulations; Agrees to accept: (1) that technical progress in the matter of frequency stabilization is such that all stations may keep themselves within the limits of tolerance and instabilities specified in the Table below and assist in reducing interference caused by frequency variations; (2) that the Table below should be substituted for that given in Appendix 1 of the Madrid General Regulations; (3) that the question of improving tolerance and stability con- ditions should be kept on the Agenda and extended to higher fre- quencies than those appearing in the following table within the limits of regulations to be adopted by the Cairo Conference; REVISED TABLE OF FREQUENCY TOLERANCE AND INSTABILITIES. (1) frequency tolerance is the maximum permissible separation between the frequency assigned to a station and the real transmission frequency. (2) this separation results from the combination of three errors; (a) error of the radio frequency meter or of the frequency indicator used; (b) error made during the adjustment of the transmitter. (c) slow variations of the transmitter frequency. (3) in frequency tolerance no account is taken of modulation. (4) frequency instability is the maximum permissible separation resulting only from the error contemplated in (c) above. TABLE OF FREQUENCY TOLERANCES AND INSTABILITIES 1 Tolerances Instabilile Transmitters Transmitters now in serv- now in serv- ice and until ice and until J anuary 1, a 1942 after New Trans- January,, New trans- Fruen bands hich they itters 1942, after Ners which they mtte whic they tters hal- shall comply installed shall omn with tin from Jan. with toller- from Jan. ances in ol- 1/39 anes in col- 1 / 39 umns 2 and 4, umns 2 and 4, respectively respectively. A. From 10 to 550 Kc. a) Fixed stations b) Land stations c) Mobile Stations using indi- cated frequencies (1) d) Mobile stations using any fre- quency within the band. e) Broadcasting 0.1% 0.05% 0.1% 0.1% 0.5% 0.1% 50 cycles 20 cycles 0.5% 0.1% B. From 550 to 1600 kc/s. a) Broadcasting stations 50 cycles 20 cycles (Modified by the Cairo, 1938, revision (Treaty Series 948).]

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