ITU R BS 412:1998
ITU R BS 412:1998 Planning Standards For Terrestrial Fm Sound Broadcasting At Vhf
Table of Contents
1Minimumusablefieldstrength2Radio-frequencyprotectionratios
2.1General
2.2Monophonicservice
2.3Stereophonicservice
2.4Carrierfrequencydifferencesgreaterthan400kHz
2.5Technicalconditions
3Channelspacing
ANNEX1...Determinationofwhethertheinterferenceistobe
regardedassteadyortropospheric
ANNEX2...ParticularinterferencecasesinFMbroadcasting
1Interferencecausedbyanovermodulatedtransmitter
2Interferenceforlargecarrierfrequencydifferences
3Interferencewhentheprotectionratioisnotrespected
4RFprotectionratiosfordifferentwantedsignallevels
5InterferencecausedbyintermodulationofstrongRFsignals
ANNEX3...ProtectionratioforFMsoundbroadcastinginthe
caseofthesameprogrammeandsynchronizedsignals
1Introduction
2Measuringconditions
2.1Arrangement
2.2Evaluation
3Resultsandconsiderations
3.1Comparisonbetweenmonophonicandstereophonicmodes
3.2Resultsandconsiderationsforthestereophonicmode
4Application
5Conclusion
ANNEX4...Measurementsofthepeakdeviationandthepowerof
thecompletemultiplexsignalofanFMsound
broadcastingsignal
1Introduction
2Measurementresults