1488 Notifications. 54 Stat. 1507 . Abbreviations. 4 Stat. 1621. Composition of mes- sage. INTERNATIONAL AGREEMENTS OTHER THAN TREATIES [55 STAT. c) The frequencies to be used in radiotelephone communications with mobile police units shall not be used for radiotelegraph com- munications. d) Whenever the exchange of radiotelephone communications is authorized, these communications shall be made on the frequencies assigned to the respective stations for radiotelephone service. e) If the exchange of radiotelegraph communications is author- ized, these communications shall be made on the following frequencies: 2804 Calling 5195 Day calling 2808 Working 5135 Day working 2812 Working 5140 Day working f) Notifications concerning the particulars of stations engaged in international police service shall be forwarded to the Bureau of International Telecommunications Union, Berne, Switzerland, in order that all stations desiring to intercommunicate may be kept informed of the details concerning their operations. g) This service shall, in general, conform with the provisions of Article 17 of the Cairo Radio Regulations. h) Full use shall be made of the list of abbreviations appearing in Appendix 11 to the Cairo Radio Regulations. Plain language shall not be used if abbreviations will suffice. Service indications are as follows: "P", priority, for messages that are to be sent im- mediately, regardless of the number of other messages on file. If no service indication is given the messages are to be transmitted in the order of receipt. i) The message shall contain the preamble, text, and signature, as follows: (1) Preamble.- The preamble of the message shall consist of the following: the serial number preceded by the letter "NR"; service indications as appropriate; check (this is the group count according to standard cable count system); the letter "CK" followed by numerals indicating the number of words contained in the text of the message; office and country of origin (not abbreviated), day of month and month, hour or filing and address. (2) Text.- The text may be either in plain language or code. (3) Signature.- The signature shall include the name and title of the person originating the message. ARTICLE 8. Amateur Third Part Messages The American countries, with the purpose of further improving the close and friendly relations existing between the peoples of America, and when their internal legislation permits, agree that amateur radio stations in their respective countries and possessions may inter- nationally exchange messages emanating from third parties; provided, however, that such messages shall be of a character that would not normally be sent by any other existing means of electrical com- munications and on which no compensation may be directly or indirectly paid.
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