63 STAT.] AMULTILATERALTELECOMMUNICATIONS-OCT. 2, 1947 (Chapter V, art. 18 RR) (S781-4) or installations of any kind does not cause harmful interfer- ence to a radio service operating in accordance with the provi- sions of the present Regulations. Section III. Special Cases of Interference 378/379 § 7. Except in cases of distress, communications between ship stations or between ship and aircraft stations must not interfere with the work of coast stations. When this work is thus interfered with, the ship or aircraft station which causes it must stop transmitting or change frequency upon the first request of the coast station concerned. 8 -|---- Section IV. Tests 380 § i. (1) Before authorizing tests and experiments in any station each administration, in order to avoid harmful inter- ference, shall prescribe the taking of all possible precautions such as the choice of frequency and of time and the reduc- tion or, if possible, the suppression of radiation. Any harm- ful interference resulting from tests and experiments shall be eliminated as soon as possible. 381 (2) Signals for testing and adjustment must be chosen in such a manner that no confusion will arise with a signal, abbreviation, etc., having a special meaning defined by these Regulations or by the International Code of Signals. 382 (3) For testing in mobile stations see 679 and 680. A. SfSection V. Identification of emissions 383§. The transmission of signals without indentification is forbidden to all stations. 10 .--- 384§». In order that the identification of stations may be as rapid as possible, stations provided with a call sign in ac- cordance with article 19 must, unless the Regulations provide otherwise, transmit this call sign during the course of their transmission as frequently as is practicable and reasonable 1747
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