QID23 – VDL2 & ADS-B

Lately I have been experimenting with also pulling in VDL2 traffic with my Raspberry. And with good results. Today I even logged my first military aircraft on VDL2:

[2022-05-19 10:58:14 GMT] [136.975] [-0.1/-36.0 dBFS] [35.9 dB] [-31.9 ppm]
AE048A (Aircraft, On ground) -> 10980A (Ground station): Response
AC info: 63-8008, Boeing, KC-135R, United States Air Force
GS info: EBBR Brussels Belgium 50°54’N 004°30’E
AVLC type: S (Receive Ready) P/F: 0 rseq: 1

[2022-05-19 11:00:09 GMT] [136.975] [-0.4/-36.6 dBFS] [36.2 dB] [-32.2 ppm]
AE048A (Aircraft, On ground) -> 10900A (Ground station): Command
AC info: 63-8008, Boeing, KC-135R, United States Air Force
GS info: EHAM Amsterdam Schiphol
AVLC type: I sseq: 1 rseq: 1 poll: 0
ACARS:
Reassembly: skipped
Reg: .38008S Flight: MC0000
Mode: 2 Label: 4J Blk id: 2 More: 0 Ack: ! Msg num: M35A
Message:
POS/ID38008S,QID23,/DC19052022,110005/MR30,/ET191135/PSN52153E004139,110000,340,XAMAN,191112,IDESI,M50,20468,M077T450/CG284,160,350/FB661/VR320E90

The same aircraft was identified as QID23 (QUID23) on ADS-B 1090 MHz.

Later today also the Finnish Air Force Learjet 35 LJ-3 was logged on VDL2:

[2022-05-19 17:14:19 GMT] [136.975] [-12.8/-35.8 dBFS] [23.0 dB] [-32.9 ppm]
46788B (Aircraft, Airborne) -> 20B677 (Ground station): Response
AC info: LJ-3, Gates, Learjet 35 A, Finnish Air Force
GS info: EHAM Amsterdam Schiphol 52°18’N 004°48’E
AVLC type: S (Receive Ready) P/F: 0 rseq: 7

The software I use is DumpVDL2. I have also built my own VHF airband antenna recently that I now use to monitor VDL2. The antenna is a flowerpot coaxial dipole which is really easy to make. There are a lot of instructions online, for example take a look on G4NS and VK2ZOI. An online calculator for the flowerpot can be found here.

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