1. ACP WG B Work Program Frequency Planning Criteria
VDL Mode 2
VDL Mode 3
VDL Mode 4
VDL Mode 4 Global Signaling Channel
On-board aircraft compatibility

2. Papers for WG B 18TH Meeting, 17-25 February 2005 Bangkok, Thailand
Working Paper 9, Report of VDL Mode 3 Voice Quality Tests With Radio Interference, by Yasuyoshi Nakatani, Japan

3. VDL Frequency Planning
WGB/17 completed the frequency assignment planning material, including relevant guidance material, for VHF digital link (VDL) Modes 2
VDL Mode 3 could operate on the fourth adjacent 25 kHz channel from a DSB-AM assignment and on the second adjacent 25 kHz channel from a VDL Mode 3 assignment.
Test planning for VDL Mode 4, including the need for an assignment in the MHz band is on-going.
Excerpt From ACP-Memo/02, 14/01/05, from ACP Secretary to Members, Aeronautical Communications Panel (ACP)

4. Summary VDL Mode 2 Frequency Planning Criteria1
Number of Channels for no planning
Note:
1. WGB16/WP14 Appendix (after Tokyo) from AMCP/8-WP/66 5J-20 Appendix J to the Report on Agenda Item 5.

5. Vs Interference Source DSB-AM VDL M3 A G 1 - 42 2 22
Summary VDL Mode 3 Frequency Planning Criteria1 Number of Channels for no planning Vs
Interference Source
DSB-AM
VDL M3 A G
Victim 1 - 42 2 22
Notes:
1. WP-WGB17 Document 08, 17th Meeting of Aeronautical Communications Panel Working Group B (ACP WG-B) Montreal, Canada, 20 to 25 October 2004 and 26 to 28 October 2004, VDL Mode 3 to VDL Mode 3 Avionics Interference Testing, Agenda Item 4: VDL frequency assignment planning criteria for VDL Mode 3, Presented by the United States of America.
 2. ACP-Memo/02, 14/01/05, Ref SP 62/2, To Members, Aeronautical Communications Panel (ACP), From ACP Secretary, Progress of Aeronautical Communications Panel (ACP) Subject, To note and provide comments by 15 February 2005.

6. Status Frequency Planning Criteria VDL Mode 4
Test Plan Presented to WG B
Testing according to the test plan is planned for early next year.
Reference: ACP (WG B), 17th Meeting, 20 – 25th of October 2004, Montreal, Canada Signalling Channels for VDL Mode 4, F. Lindblom, Swedish CAA, Sweden

7. VDL Band implementation target plan agreed by the EANPG FMG.
Reference: ACP (WG B), 17th Meeting, 20 – 25th of October 2004, Montreal, Canada Signalling Channels for VDL Mode 4, F. Lindblom, Swedish CAA, Sweden

8. Future Work VDL Mode 4 Global Signaling Channel
Further work was needed to complete the the work on Frequency Planning Criteria.
VDL Mode 3 to VDL Mode 2
VDL Mode 4 to VDL Mode 2
Guidance material on 8.33 kHz and 50 kHz radios.
There are currently no plans to provide further guidance material on 50 kHz radios, unless required.
Note: 1. Report of the 17th Meeting of Aeronautical Communications Panel (ACP)
Working Group B, 20 to 25 October, 2004, Montreal, Canada
VDL Mode 4 Global Signaling Channel
On-board aircraft EMC is ongoing