Page:United States Statutes at Large Volume 49 Part 2.djvu/501

TELECOMMUXICATIOX COXVEXTIOX. DECEMBER 9, 1932. [336] (11) (a) The wave for the reply to a call transmitted on the general calling-wave [see § 1 (2)] shall be the wave of 500 kc (600 m), the same as that for calling. [337] (6) The wave for the reply to a call, for aircraft stations and aeronautical stations working in the band 315 to 365 kc (952 to 822 m) shall be the wave of 333 kc (900 m), the same as that for calling. [338] (c) The wave for the reply to a call transmitted on the international calling-wave of 143 kc (2,100 m) [see § 1 (4)] shall be: the wave of 143 kc (2,100 m) for a mobile station; the normal working-wave, for a coast station. [330] § 2. (1) In order to increase safety of life at sea (ships), and over the sea (aircraft), all the stations of the maritime mobile service which normally listen on the waves of the authorized bands between 365 and 515 kc (822 and 583 m) must, during their working hours, make the necessary provisions to insure the watch on the distress wave [500 kc (600 m)] twice per hour, for 3 minutes, beginning at x:15 and at x:45 o'clock, Greenwich mean time. 2517 {340] (2) During the intervals indicated above, outside the P"", p. Zfl .13. transmissions mentioned in article 22 (§§ 22 to 28): r41] A. Transmissions must cease in the bands of 460 to 550 kc (652 to 545 m); [3U] B. Outside these bands: (a) transmissions of type B waves shall be for- bidden; (6) other transmissions of the mobile service sta- tions may continue; stationsof themaritimemobile service maylisten to these transmissions on the express condition that these stations shall first insure the watch on the distress wave, as provided for in sub- paragraph (1) of this paragraph. [343] § 3. Since calls in the authorized bands between 365 and 515 kc (822 and 583 m) and from 315 to 365 kc (952 to 822 m) are nor- mally made on the international calling-waves [§ 1 (2) and (3) above], mobile service stations open to the service of public correspondence and using waves from these bands for their work must, during their hours of watch, remain on watch on the calling-wave of their service. These stations, while observing the provisions of article 19, § 2 (1) Ard" p. 2M3. and (2) and § 4 D, are authorized to abandon this watch only when they are engaged in a communication on other waves. [344] § 4. The following rules must be followed in the operation of stations of the mobile service using type-AI waves in the band 100 to 160 kc (3,000 to 1,875 m): [345] A. (a) Any coast station carrying on a communication on one of these waves must listen on the wave of 143 kc (2,100 m), unless otherwise indicated in the nomenclature.