ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 SPECIFICS ON FM BROADCAST INTERFERENCE presentation by Steve Mitchell, UK

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 A LITTLE BIT OF HISTORY Changes to ITU Radio Regulations recognition of potential interference to aeronautical systems studies within the ITU initial studies further enhanced studies final ITU recommendations

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 GENERAL TYPES OF INTERFERENCE Four types of interference to consider Type A A1 A2 Type B B1 2 signal 3signal B2

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 DIFFICULTIES WITH ILS/VOR/COM Extensive testing ILS/VOR receivers 3rd order intermodulation saturation Com receivers ICAO Annex 10 SARPs requirements 3rd order 2 signal Desensitisation

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 DIFFICULTIES WITH GBAS AND VDL 4 Testing of GBAS and VDL 4 receivers same mechanisms apply as for ILS/VOR/COM avionics manufacturers tests above 112 MHz split in desensitisation requirements similar A1and B1 criteria as ILS/VOR ICAO Annex 10 SARPs requirements 3rd order 2 signal Desensitisation

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 Co-ordination Why co-ordination? Between FM broadcasters mutual sharing Between FM broadcasters and aeronautical avoid interference to aeronautical services Between aeronautical and FM broadcasters avoid potential problems

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 Example of co-ordination process Example of an approach to co- ordination European example inside a State databases computer tools agreement mechanism between States LEGBAC/EBU

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 TYPE A1 CALCULATION

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 TYPE A2 CALCULATION

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 TYPE B1 CALCULATION 2 SIGNAL

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 TYPE B1 CALCULATION 3 SIGNAL

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 TYPE B2 CALCULATION

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 TRIGGER AND CUT-OFF CALCULATIONS

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 ILS PROTECTION

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 VOR PROTECTION

n ICAO Regional Spectrum Seminar, Cairo, Egypt June 2006 PRACTICAL SOLUTIONS WITH AUDIENCE PARTICIPATION