Art. 57 Radioreglement 1979 — Radiotelephony

57.1 § 1 The procedure detailed in Recommendation ITU-R M.1171-0 shall be applicable to radiotelephone stations, except in cases of distress, urgency or safety. (WRC-15) 57.2 § 2 The radiotelephone public correspondence service provided on ships should, if possible, be operated on a duplex basis. 57.3 § 3 1) Devices providing for the emission of a signal to indicate that a call is in progress on a channel may be used in this service on a non-interference basis to the service provided by coast stations. 57.4 2) The use of devices for continuous or repetitive calling or identification in a manually operated radiotelephony service is not permitted. 57.5 3) A station may not transmit identical information simultaneously on two or more frequencies when communicating with only one other station. 57.6 4) A station shall not emit any carrier wave between calls. However, stations in an automatically operated radiotelephone system may emit marking signals under the conditions provided for in No. 52.179. 57.7 5) When it is necessary to spell out certain expressions, difficult words, service abbreviations, figures, etc., the phonetic spelling tables in Appendix 14 shall be used. 57.8 § 4 Calling, and signals preparatory to traffic, shall not exceed one minute when made on the carrier frequency 2 182 kHz or on 156.8 MHz, except in cases of distress, urgency or safety. (WRC-07) 57.9 § 5 When it is necessary for a ship station to send signals for testing or adjustments which are liable to interfere with the working of neighbouring coast stations, the consent of these stations shall be obtained before such signals are sent. 57.10 § 6 When it is necessary for a station to make test signals, either for the adjustment of a transmitter before making a call or for the adjustment of a receiver, such signals shall be kept to a minimum but in any event, shall not exceed ten seconds, and shall include the call sign or other identification of the station emitting the test signals. This call sign or other identification shall be spoken slowly and distinctly.

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