Page:United States Statutes at Large Volume 54 Part 2.djvu/369

 54STAT.] MULTILATERAL-TELECOMMUNICATION-APR. 8, 1938 1589 APPENDIX 1 Table of Frequency Tolerances (See article 6) Ant, p. 1429. 1. The frequency tolerance is the maximum permissible separation between the actual frequency of an emission and the frequency which this emission should have (frequency notified or frequency chosen by the operator). 2. This separation results from the following errors: (a) Error made when the station was calibrated; this error presents a semi-permanent character. (b) Error made during use of the station (error variable from one transmission to another and resulting from actual operating conditions: ambient temperature, voltage of supply, antenna, skill of the operator, et cetera). This error, which is usually small i other services, is particularly important in the case of mobile stations. (c) Error due to slow variations of the frequency of the trans- mitter during a transmission. Note.-In the case of transmissions without a carrier wave, the preceding definition applies to the frequency of the carrier wave before its suppression. 3. In the case of ship stations, the reference frequency is the fre- quency on which the transmission begins, and the figures appearing in the present table, marked by an asterisk, refer only to frequency separations observed during a ten-minute period of transmission. 4. In the frequency tolerance, modulation is not considered. Frequency bands (wavelengths) A. From 10 to 550 kc (30,000 to 545 m): (a) Fixed stations .. . . . ... ... (b) Land stations. .. .. ...... (c) Mobile stations using frequencies other than those of bands indicated under (d). (d) Mobile stations using frequencies of the bands 110-160 kc (2,727 to 1,875 m), 365-515 kc (822 to 583 m). ...... (e) Aircraft stations .. . . ...... (f) Broadcasting............. Tolerances Transmitters In service now and until January 1, 1944,afterwbich date they will conform to the tolerances Indi- cated in column 2 Column 1 0.1% 0.1% 0.5% 0. 5%* 0.5% 50 cycles t It is recognized that a great number of spark transmitters and simple self-oscillator transmittes exist in this service which are not able to meet these requirements. New transmit- ters installed beginning Janu- ary 1, 1940 Column 2 0.1% 0.1% 0.1% 0. 3%* 0.3% 20 cycles
 * See preamble, under 3.

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