1、 Recommendation ITU-R M.1170-1(03/2012)Morse telegraphy procedures in the maritime mobile serviceM SeriesMobile, radiodetermination, amateurand related satellite servicesii Rec. ITU-R M.1170-1 Foreword The role of the Radiocommunication Sector is to ensure the rational, equitable, efficient and econ
2、omical use of the radio-frequency spectrum by all radiocommunication services, including satellite services, and carry out studies without limit of frequency range on the basis of which Recommendations are adopted. The regulatory and policy functions of the Radiocommunication Sector are performed by
3、 World and Regional Radiocommunication Conferences and Radiocommunication Assemblies supported by Study Groups. Policy on Intellectual Property Right (IPR) ITU-R policy on IPR is described in the Common Patent Policy for ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be us
4、ed for the submission of patent statements and licensing declarations by patent holders are available from http:/www.itu.int/ITU-R/go/patents/en where the Guidelines for Implementation of the Common Patent Policy for ITU-T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Se
5、ries of ITU-R Recommendations (Also available online at http:/www.itu.int/publ/R-REC/en) Series Title BO Satellite delivery BR Recording for production, archival and play-out; film for television BS Broadcasting service (sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodete
6、rmination, amateur and related satellite services P Radiowave propagation RA Radio astronomy RS Remote sensing systems S Fixed-satellite service SA Space applications and meteorology SF Frequency sharing and coordination between fixed-satellite and fixed service systems SM Spectrum management SNG Sa
7、tellite news gathering TF Time signals and frequency standards emissions V Vocabulary and related subjects Note: This ITU-R Recommendation was approved in English under the procedure detailed in Resolution ITU-R 1. Electronic Publication Geneva, 2012 ITU 2012 All rights reserved. No part of this pub
8、lication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R M.1170-1 1 RECOMMENDATION ITU-R M.1170-1*Morse telegraphy procedures in the maritime mobile service (1995-2012) Scope This Recommendation provides the information on the general use of Morse telegraphy
9、, methods of calling, rules on the start and end of working with Morse signals. The ITU Radiocommunication Assembly, considering a) that since some administrations may still use Morse telegraphy for the maritime mobile service, recommends 1 that Morse telegraphy in the maritime mobile service should
10、 be performed in accordance with Annex 1. Annex 1 Section I. Introduction 1. The use of the Morse code signals is not obligatory any more. Nevertheless due to the fact that the radiotelegraphy is less susceptible to interference and it is the most efficient means in case of emergency or disaster, th
11、e usage of Morse code in some areas by some operators could be practical and sometimes the only available means of communications. 2. The service abbreviations given in Recommendation ITU-R M.1172 are to be used. *This Recommendation should be brought to the attention of the International Maritime O
12、rganization (IMO), and the Telecommunication Standardization Sector (ITU-T). Note by the Secretariat: The references made to the Radio Regulations (RR) in this Recommendation refer to the RR as revised by the World Radiocommunication Conference 1995. These elements of the RR will come into force on
13、1 June 1998. Where applicable, the equivalent references in the current RR are also provided in square brackets. 2 Rec. ITU-R M.1170-1 Section II. Preliminary operations 3. (1) Before transmitting, a station shall take precautions to ensure that its emissions will not interfere with transmissions al
14、ready in progress; if such interference is likely, the station shall await an appropriate break in the communications in progress. (2) If, these precautions having been taken, the emissions of the station should, nevertheless, interfere with a transmission already in progress, the following rules sh
15、all be applied: a) the ship station whose emission causes interference to the communication of a mobile station with a coast station shall cease sending at the first request of the coast station; b) the ship station whose emission causes interference to communications already in progress between mob
16、ile stations shall cease sending at the first request of one of the other stations; c) the station which requests this cessation shall indicate the approximate waiting time imposed on the station whose emission it suspends. Section III. Calls by Morse radiotelegraphy A. General 4. (1) As a general r
17、ule, it rests with the ship station to establish communication with the coast station. For this purpose, the ship station may call the coast station only when it comes within the service area of the latter, that is to say, that area within which, by using an appropriate frequency, the ship station c
18、an be heard by the coast station. (2) However, a coast station having traffic for a ship station may call this station if it has reason to believe that the ship station is keeping watch and is within the service area of the coast station. 5. (1) In addition, each coast station shall, so far as pract
19、icable, transmit its calls in the form of “traffic lists” consisting of the call signs in alphabetical order of all ship stations for which it has traffic on hand. These calls are made at specified times fixed by agreement between the administrations concerned and at intervals of at least two hours
20、and not more than four hours during the working hours of the coast station. (2) In the bands between 4 000 kHz and 27 500 kHz, however, traffic lists may be transmitted at intervals of not less than one hour. (3) Continuous or frequently repeated emissions of its call sign or of the enquiry signal C
21、Q by a coast station should be avoided (see RR No. 15.1 No. 1799). (4) Coast stations shall transmit their traffic lists on their normal working frequencies in the appropriate bands. This transmission shall be preceded by a general call to all stations (CQ). (5) The call to all stations announcing t
22、he traffic list may be sent on a calling frequency in the following form: CQ, not more than three times; the word DE; Rec. ITU-R M.1170-1 3 the call sign of the calling station, not more than three times; QSW followed by the indication of the working frequency or frequencies on which the traffic lis
23、t is about to be sent. In no case may this preamble be repeated. (6) The hours at which coast stations transmit their traffic lists and the frequencies and classes of emission which they use for this purpose shall be stated in the List of Coast Stations and special service stations. (7) Ship station
24、s should, as far as possible, listen to the traffic lists transmitted by coast stations. On hearing their call sign in such a list they shall reply as soon as they can do so. (8) When the traffic cannot be sent immediately, the coast station shall inform each ship station concerned of the probable t
25、ime at which working can begin, and also, if necessary, the frequency and class of emission which will be used. 6. When a coast station receives calls from several ship stations at practically the same time, it decides the order in which these stations may transmit their traffic. Its decision shall
26、be based on the priority (see RR No. 53.1 of the radiotelegrams that ship stations have on hand and on the need for allowing each calling station to clear the greatest possible number of communications. 7. (1) When a station called does not reply to a call sent three times at intervals of two minute
27、s, the calling shall cease and shall not be renewed until after an interval of fifteen minutes. (2) In the case of a communication between a station of the maritime mobile service and an aircraft station, calling may be renewed after an interval of five minutes, notwithstanding (1) 7. above. (3) Bef
28、ore renewing the call, the calling station shall ascertain that the station called is not in communication with another station. (4) If there is no reason to believe that harmful interference will be caused to other communications in progress, the provisions of RR No. 51.71 and 7.(1) are not applica
29、ble. In such cases the call, sent three times at intervals of two minutes, may be repeated after an interval of less than fifteen minutes but not less than three minutes. 8. Ship stations shall not radiate a carrier wave between calls. 9. When the name and address of the administration or private op
30、erating agency controlling a ship station are not given in the appropriate list of stations or are no longer in agreement with the particulars given therein, it is the duty of the ship station to furnish as a matter of regular procedure, to the coast station to which it transmits traffic, all the ne
31、cessary information in this respect. 10. (1) The coast station may, by means of the abbreviation TR, ask the ship station to furnish it with the following information: a) position and, whenever possible, course and speed; b) next port of call. (2) The information referred to in 10.(1) above, precede
32、d by the abbreviation TR, should be furnished by ship stations whenever this seems appropriate, without prior request from the coast station. The provision of this information is authorized only by the master or person responsible for the ship or other vessel carrying the ship station. 4 Rec. ITU-R
33、M.1170-1 B. Calls to several stations 11. Two types of calling signal “to all stations” are recognized: a) call CQ followed by the letter K ( 12, 13); b) call CQ not followed by the letter K ( 14). 12. Stations desiring to enter into communication with stations of the maritime mobile service without
34、, however, knowing the names of any such stations within their service area may use the enquiry signal CQ in place of the call sign of the station called in the calling formula, the call being followed by the letter K (general call to all stations in the maritime mobile service with request for repl
35、y). 13. In regions where traffic is congested, the use of the call CQ followed by the letter K is forbidden. As an exception it may be used with signals denoting urgency. 14. The call CQ not followed by the letter K (general call to all stations without request for reply) is used before the transmis
36、sion of information of any kind intended to be read or used by anyone who can intercept it. 15. The call CP followed by two or more call signs or by a code word (call to certain receiving stations without request for reply) is used only for the transmission of information of any nature intended to b
37、e read or used by the persons authorized. Section IV. Method of calling, reply to calls and signals preparatory to traffic A. Method of calling Morse telegraphy 16. (1) The call consists of: the call sign of the station called, not more than twice; the word DE; the call sign of the calling station,
38、not more than twice; the information required by 18.(1) and, as appropriate, by 19.(1) and 19.(2); the letter K. (2) For normal calling, when the requirements mentioned in (3) below have been met, the call specified in 16.(1) above may be transmitted twice at an interval of not less than one minute;
39、 thereafter it shall not be repeated until after an interval of three minutes. (3) In order to reduce interference, ship stations shall, within the means at their disposal, endeavour to select for calling the band with the most favourable propagation characteristics for effecting reliable communicat
40、ion. In the absence of more precise data, a ship station shall, before making a call, listen for the signals of the station with which it desires to communicate. The strength and intelligibility of such signals are useful as a guide to propagation conditions and indicate which is the preferable band
41、 for calling. Rec. ITU-R M.1170-1 5 B. Frequency to be used for calling and for preparatory signals 17. (1) For making the call and for transmitting preparatory signals, the calling station shall use a frequency on which the station called keeps watch. (2) A ship station calling a coast station in a
42、ny of the frequency bands between 4 000 kHz and 27 500 kHz shall use a frequency in the calling band specially reserved for this purpose. C. Indication of the frequency to be used for traffic 18. (1) The call, as described in 16.(1), shall contain the service abbreviation indicating the working freq
43、uency and, if useful, the class of emission which the calling station proposes to use for the transmission of its traffic. (2) When the call by a coast station does not contain an indication of the frequency to be used for the traffic, this indicates that the coast station proposes to use for traffi
44、c its normal working frequency shown in the List of Coast Stations and special service stations. D. Indication of priority, of the reason for the call, and of transmission of radiotelegrams in series 19. (1) The calling station shall transmit the service abbreviation after the above-mentioned prepar
45、atory signals to indicate a priority message other than a distress, urgency or safety message (see RR No. 53.1) and to indicate the reason for the call. (2) Moreover, when the calling station wishes to send its radiotelegrams in series, it shall indicate this by adding the service abbreviation for r
46、equesting the consent of the station called. E. Form of reply to calls 20. The reply to calls consists of: the call sign of the calling station, not more than twice; the word DE; the call sign of the station called, once only. F. Frequency for reply 21. Except as otherwise provided in these Regulati
47、ons, for transmitting the reply to calls and to preparatory signals, the station called shall use the frequency on which the calling station keeps watch, unless the calling station has specified a frequency for the reply. G. Agreement on the frequency to be used for traffic 22. (1) If the station ca
48、lled is in agreement with the calling station, it shall transmit: a) the reply to the call; b) the service abbreviation indicating that from that moment onwards it will listen on the working frequency announced by the calling station; c) if necessary, the indications referred to in 23.; 6 Rec. ITU-R
49、 M.1170-1 d) if useful, the service abbreviation and figure indicating the strength and/or intelligibility of the signals received (see Recommendation ITU-R M.1172); e) the letter K if the station called is ready to receive the traffic of the calling station. (2) If the station called is not in agreement with the calling station on the working frequency to be used, it shall transmit: a) the reply to the call; b) the service abbreviation indicating the working frequency to be used by the calling st
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