Page:United States Statutes at Large Volume 54 Part 2.djvu/257

 54 STAT.] MULTILATERAL-TE LECOMMUNICATION-APR. 8, 1938 [209] (2) This provision shall not be compulsory for type-B wave transmitters of which the power, at full load, measured at the terminals of the alternator, does not exceed 300 watts. [210] (3) All ship stations transmitting on frequencies in the bands of 100 to 160 kc (3,000 to 1,875 m) and on frequencies above 4,000 kc (wavelengths below 75 m) must be equipped with a wave meter having a precision at least equal to 5/1000 when the transmitter itself is incapable of being adjusted with this precision or better. [211] §7. Any station installed on board a ship compulsorily pro- vided with radio apparatus as a result of an international agreement must be able to transmit and receive: [212] (a) on the wave of 500 kc (600 m), type A2 or B and, [213] (b) in addition, on at least two other waves of type A2 or B in the authorized band between 365 and 485 kc (822 and 619 m). [214] The provision set forth in no. 213 shall not apply to transmit- ters on lifeboats or to emergency transmitters of ship stations. [215] §8. In addition to the waves mentioned above, ship stations equipped to transmit type-Al, -A2, or -A3 waves may use the waves authorized in article 7.* [216] §9. All the ship-station apparatus installed for the transmission of type-Al waves in the authorized band between 100 and 160 kc (3,000 and 1,875 m) must permit of using at least two frequencies, selected in this band, in addition to the frequency of 143 kc (2,100 m). [217] §10. (1) All stations on board ships compulsorily provided with radiotelegraph apparatus must be capable of receiving the wave of 500 kc (600 m) and, in addition, all the waves necessary to the opera- tion of the service which they carry on. [218] (2) These stations must be capable of receiving type-Al and -A2 waves on the same frequencies easily and efficiently. [219] (3) It is recommended that ship stations of the first and second categories be equipped with devices permitting transmission and reception without the manipulation of switches. C. AIRCRAFT STATIONS [220] §11. Any aircraft station, following a maritime course and Arraftstation. required by national or international regulations to communicate with stations of the maritime mobile service, must be capable of transmit- ting and receiving on the wave of 500 kc (600 m), type A2. 1477
 * [See footnote on p. 1475 (No. 206).]

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