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1、Rec.ITU-RBS.705-1147RECOMMENDATIONITU-RBS.705-1*RadiocommunicationStudyGroup6madeeditorialamendmentstothisRecommendationin2002inaccordancewithResolutionITU-R44.HFtransmittingandreceivingantennascharacteristicsanddiagrams**TheDirector,RadiocommunicationBureau,isrequestedtobring§2ofPart2toAnn
2、ex?1totheattentionoftheInternationalElectrotechnicalCommission(IEC).(1990-1995)TheITURadiocommunicationAssembly,consideringa)thatResolutionITU-R?31decidedtoissueaseparatelypublishedRecommendationcontainingarevisedandcomplementedsetofHFbroadcastingantennadiagramstogetherwithotherrelevantinfo
3、rmation;b)thatthediagramspublishedinthisRecommendationshouldbeeasytobeunderstoodandusedbytheplanninganddesigningengineers,whileretainingallthenecessaryusefulinformation;c)theexperiencegainedwiththepreviouseditionsoftheex-CCIRpublication“Antennadiagrams”;d)thatthecharacteristicsoftheHFantenn
4、asascontainedinAnnexes1and2tothisRecommendationhaveawideapplication,furtherconsideringe)thattheradiationpatternofthereceivingantennashouldalsobetakenintoaccountwhenplanningsoundbroadcastingservicesinband7(HF);f)thatuptothepresenttimenoreceivingantennaradiationpatternhasbeendefinedfortheabov
5、epurpose;g)thatthereceivingenvironmentsignificantlyaffectstheradiationpatternofreceivingantennas;h)thatashortverticalwhipantennaismostoftenusedforreceptionofsoundbroadcastinginband7(HF),recommends1thattheformulaeasillustratedbysamplediagramsandcontainedinAppendix1toAnnex?1ofthisRecommendati
6、ontogetherwiththecorrespondingcomputerprogramsshouldbeusedtoevaluatetheperformanceofHFtransmittingantennas;particularlyforplanningpurposes;2thattheformulaasillustratedbyasamplediagramandcontainedinPart1toAnnex2tothisRecommendationshouldbeusedtoevaluatetheperformanceofthereceivingantennaforp
7、lanningsoundbroadcastingservicesinband?7?(HF).Rec.ITU-RBS.705-1147NOTE?1?–?Part?1toAnnex?1givescomprehensiveanddetailedinformationonthetheoreticalcharacteristicsofHFtransmittingantennas.Computerprogramshavebeendevelopedfromthetheorytocalculatetheradiatio
