CONTENTS

Policy on Intellectual Property Right (IPR)     ii
1 Introduction  1
2 Assessment of potential interference from FM broadcasting stations operating in the band around 87 to 108 MHz into aeronautical VDL Mode 4 systems in the band 112‑117.975 MHz     2
        2.1 Type A1 interference  2
        2.2 Type A2 interference  4
        2.3 Type B1 interference  5
        2.4 Type B2 interference  6
3 Assessment of potential interference from VDL Mode 4 transmissions in the band 112-117.975 MHz into FM broadcasting receivers in the band around 87 to 108 MHz     7
        3.1 Measurements  7
        3.2 Separation distances  7
        3.3 Conclusions  8
Annex 1  Measurements dealing with impact of VDL Mode 4 transmissions on commercial FM broadcast receivers     11
1 Introduction  11
2 Test description  11
3 Test results  13
4 Conclusion  14
Appendix 1     21
VDL Mode 4 spectrum     21
Appendix 2  Band pass filter frequency response     21
Appendix 2  Band pass filter frequency response     22