ITU R BS 560:1997
ITU R BS 560:1997 Radio-frequency Protection Ratios In Lf, Mf, And Hf Broadcasting
Table of Contents
1RFprotectionratioinbands5(LF)and6(MF)2RelativeRFprotectionratiocurvesinbands5(LF),
6(MF)and7(HF)
ANNEX1
ANNEX2-Presentationofexperimentalresults
ANNEX3-ProtectionratiosusedintheLF,MFandHF
broadcasting
1Introduction
2Audio-frequencyprotectionratio
3RFprotectionratio
4Generalprincipleofnon-subjectivemethods
5RFprotectionratiosforground-waveservices
5.1Stablewantedandinterferingsignals(ground-wave
signalinterferedwithbyanotherground-wavesignal)
5.2Stablewantedandfluctuatinginterferingsignal
5.3Long-termfield-strengthvariations
6RFprotectionratiosforsky-waveservices
6.1Bands5(LF)and6(MF)
6.2Band7(HF)
7Dataavailableonprotectionratios
8Measurementresults
9Subjectiveassessmentofthequalityofreception
9.1InvestigationscarriedoutintheUSSR
9.2InvestigationscarriedoutinJapan
10RFprotectionratiosforsynchronizedbroadcasting
transmitters
10.1InvestigationscarriedoutintheUSSR
10.2InvestigationscarriedoutwithintheEBU7
10.3InvestigationscarriedoutwithintheOIRT
10.4InvestigationscarriedoutintheUnitedKingdom
10.5InvestigationscarriedoutinIndia
10.6InvestigationscarriedoutinJapan
10.7InvestigationscarriedoutinthePeople'sRepublic
ofChina
ANNEX4-Planningparametersinband7(HF)consideredby
theWARCHFBC-8
1RFprotectionratios
1.1Protectionratioforunsynchronizedtransmissions
1.2Protectionratioforsynchronizedtransmissions
1.3RelativeRFprotectionratios
2Minimumusablefieldstrength
3Signalfadingallowance
3.1Short-term(withinthehour)fading
3.2Long-term(day-to-day)fading
3.3Combineddistributionoffadingapplicabletowanted
andunwantedsignals