VHF Data Link - Mode 2 (VDL-M2)

VDL-M2 (Known as VDL2 or VDLM2) is a means of sending information between aircraft and ground stations. VDL Mode 2 is the only VDL mode being implemented operationally to support Controller Pilot Data Link Communications (CPDLC). VDL-M2 uses D8PSK (Differentially Encoded 8-Phase Shift Keying) with 31.5 kbps speed at 25 kHz bandwidth and 10500 Bd. 

To receive VDL2 signals at frequencies: 136.975-136775 Mhz. I installed dumpVDL2 version 2.2.0 and use a RaspberryPi3, an RTLSDR V.3 dongle, PlanePlotter, Display-Lancher and a Diamond X50 dual band antenna.

 

 

 

1330 Km 😜 

 

 

 

Display-Lancher 😏

NNNN

[2023-03-27 16:50:30 CEST] [136.775] [-36.1/-50.5 dBFS] [14.4 dB] [0.1 ppm]
471FA0 (Aircraft, Airborne) -> 214925 (Ground station): Command
AVLC type: U (XID) P/F: 1
XID: Handoff Initiation
Public params:
Parameter set ID: 8885:1993
Procedure classes: 00 01
HDLC options: 20 a4 80
VDL params:
Parameter set ID: V
Connection management: 01
XID sequencing: seq: 5 retry: 0
AVLC specific options: 25
Destination airport: EPKT
Aircraft location: 39.6N 16.7E 34000 ft