1、INTERNATIONALSTANDARDIEC62238First edition2003-03Maritime navigation and radiocommunicationequipment and systems VHF radiotelephone equipment incorporatingClass D Digital Selective Calling(DSC)Methods of testing and required test resultsReference numberIEC 62238:2003(E)LICENSED TO MECON Limited.-RAN
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8、nce,please contact the Customer Service Centre:Email:custserviec.chTel:+41 22 919 02 11Fax:+41 22 919 03 00LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.INTERNATIONALSTANDARDIEC62238First edition2003-03Maritime navigation and radioco
9、mmunicationequipment and systems VHF radiotelephone equipment incorporatingClass D Digital Selective Calling(DSC)Methods of testing and required test results IEC 2003 Copyright-all rights reservedNo part of this publication may be reproduced or utilized in any form or by any means,electronic ormecha
10、nical,including photocopying and microfilm,without permission in writing from the publisher.International Electrotechnical Commission,3,rue de Varemb,PO Box 131,CH-1211 Geneva 20,SwitzerlandTelephone:+41 22 919 02 11 Telefax:+41 22 919 03 00 E-mail:inmailiec.ch Web:www.iec.chXBFor price,see current
11、cataloguePRICE CODECommission Electrotechnique InternationaleInternational Electrotechnical Commission LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.2 62238 IEC:2003(E)CONTENTSFOREWORD.5INTRODUCTION.61Scope.72Normative references.73T
12、erms,definitions and abbreviations.83.1Definitions.83.2Abbreviations.94General and operational requirements.94.1General.94.2Composition.94.3Construction.94.4Controls and indicators.104.5Facilities for coding and decoding of DSC.114.6DSC display.124.7Handset and loudspeaker.134.8Safety precautions.13
13、4.9Labelling.134.10 Warm up.145Technical requirements.145.1Switching time.145.2Class of emission and modulation characteristics.145.3Facilities for DSC transmission and reception.145.4Ships identity MMSI and Group MMSI.155.5Entry of position information.155.6Alarm circuits for incoming calls.155.7Mu
14、ltiple watch facilities.165.8Built-in test.176General conditions of measurement.176.1Arrangements for test signals applied to the receiver input.176.2Squelch.176.3Normal test modulation.176.4Artificial antenna.186.5Arrangements for test signals applied to the transmitter input.186.6Test channels.186
15、.7Generation and examination of the digital selective call signal.186.8Standard test signals for DSC.186.9Determination of the symbol error ratio in the output of the receiving part.186.10 Measurement uncertainty and interpretation of the measured results.196.11 Test conditions,power sources,and amb
16、ient temperatures.196.12 Normal test conditions.206.13 Extreme test conditions.206.14 Procedure for tests at extreme temperatures.21LICENSED TO MECON Limited.-RANCHI/BANGALOREFOR INTERNAL USE AT THIS LOCATION ONLY,SUPPLIED BY BOOK SUPPLY BUREAU.62238 IEC:2003(E)3 7Environmental tests.217.1Introduction.217.2Procedure.217.3Performance check.217.4Vibration test.217.5Temperature tests.218Transmitter.228.1Frequency error.228.2Carrier power.228.3Frequency deviation.238.4Sensitivity of the modulator,in
