1、 Recommendation ITU-R M.690-3 (03/2015) Technical characteristics of emergency position-indicating radio beacons operating on the carrier frequencies of 121.5 MHz and 243 MHz M Series Mobile, radiodetermination, amateur and related satellite services ii Rec. ITU-R M.690-3 Foreword The role of the Ra
2、diocommunication Sector is to ensure the rational, equitable, efficient and economical 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 r
3、egulatory and policy functions of the Radiocommunication Sector are performed by 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
4、 ITU-T/ITU-R/ISO/IEC referenced in Annex 1 of Resolution ITU-R 1. Forms to be used 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
5、T/ITU-R/ISO/IEC and the ITU-R patent information database can also be found. Series 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
6、sound) BT Broadcasting service (television) F Fixed service M Mobile, radiodetermination, 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
7、 between fixed-satellite and fixed service systems SM Spectrum management SNG Satellite 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. Elect
8、ronic Publication Geneva, 2015 ITU 2015 All rights reserved. No part of this publication may be reproduced, by any means whatsoever, without written permission of ITU. Rec. ITU-R M.690-3 1 RECOMMENDATION ITU-R M.690-3 Technical characteristics of emergency position-indicating radio beacons operating
9、 on the carrier frequencies of 121.5 MHz and 243 MHz (1990-1995-2012-2015) Scope This Recommendation contains technical characteristics to which emergency position-indicating radio beacons (EPIRBs) intended to operate on the carrier frequency of 121.5 MHz and 243 MHz should conform. Additional chara
10、cteristics for EPIRBs intended for carriage on aircraft are specified in relevant annexes to the Convention on International Civil Aviation. Keywords Maritime, EPIRB, 121.5 MHz, 243 MHz, characteristics Abbreviations/Glossary EPIRB Emergency position-indicating radio beacon ICAO International Civil
11、aviation Organization. The ITU Radiocommunication Assembly, considering a) that the Radio Regulations define the purpose of emergency position-indicating radio beacon (EPIRB) signals; b) that administrations authorizing the use of EPIRBs operating on carrier frequencies of 121.5 MHz and 243 MHz shou
12、ld ensure that such EPIRBs comply with relevant ITU-R Recommendations and the standards and recommended practices of ICAO, recommends 1 that the technical characteristics of EPIRBs operating on the carrier frequencies of 121.5 MHz and 243 MHz should be in accordance with Annex 1. Annex 1 Technical c
13、haracteristics of emergency position-indicating radio beacons operating on the carrier frequencies of 121.5 MHz and 243 MHz EPIRBs operating on the carrier frequencies of 121.5 MHz and 243 MHz should fulfil the following conditions (see Note 1): a) emission in normal antenna conditions and positions
14、 should be vertically polarized and be essentially omnidirectional in the horizontal plane; b) carrier frequencies should be amplitude-modulated (minimum duty cycle of 33%), with a minimum depth of modulation of 0.85; 2 Rec. ITU-R M.690-3 c) the emission should consist of a characteristic audio-freq
15、uency signal obtained by amplitude modulation of the carrier frequencies with an upward or a downward audio-frequency sweep within a range of not less than 700 Hz between 300 Hz and 1 600 Hz and with a sweep repetition rate of two to four times per second; d) the emission should include a clearly de
16、fined carrier frequency distinct from the modulation sideband components; in particular, at least 30% of the power should be contained at all times within: 30 Hz of the carrier frequency on 121.5 MHz; 60 Hz of the carrier frequency on 243 MHz; e) the class of emission should be A3X; however, any typ
17、e of modulation which satisfies the requirements laid down in b), c) and d) above may be used, provided it does not impair the precise locating of the radio beacon. NOTE 1 Additional characteristics for EPIRBs aboard aircraft are specified in the relevant annexes to the Convention on International Civil Aviation.
