DS EN 302842-3:2005 Electromagnetic Compatibility And Radio Spectrum Matters (Erm) - Vhf Air-Ground And Air-Air Digital Link (Vdl) Mode 4 Radio Equipment - Technical Characteristics And Methods Of Measurement For Aeronautical Mobile (Airborne) Equipment - Part 3: Additional Broadcast Aspects Provides the technical specifications for Very High Frequency (VHF) Digital Link (VDL) Mode 4 aeronautical mobile (airborne) radio transmitters, transceivers and receivers for air-ground and air-air c