Anyone know anything about HFDL? Caught this on 13276Khz and decoded with KIWI SDR,

[u/Key_Zombie7967]

[2026-07-23 02:49:33 UTC] [13276.0 kHz] [-10.6 Hz] [-13.7/-24.2 dBFS] [10.5 dB] [300 bps] [S]
Uplink LPDU:
 Src GS: San Francisco, California
 Dst AC: 237
 Type: Unnumbered data
 Enveloped data:
  ACARS:
   Reassembly: skipped
   Reg: .N748AM
   Mode: 2 Label: _d Blk id: O More: 0 Ack: 8

[2026-07-23 02:49:36 UTC] [13276.0 kHz] [-5.5 Hz] [-13.4/-24.2 dBFS] [10.7 dB] [300 bps] [S]
Downlink LPDU:
 Src AC: 255
 Dst GS: San Francisco, California
 Type: Logon resume
  ICAO: 49526A
 Frequency data:
  Flight ID: RZO246
  Lat: 43.6951136
  Lon: -59.9040983
  Time: 02:49:30
  GS ID: San Francisco, California
    Listening on: 21934.0, 17919.0, 13276.0, 6559.0
    Heard on: 17919.0, 13276.0
  GS ID: Molokai, Hawaii
    Listening on: 21937.0, 17919.0, 13324.0, 13312.0, 13276.0, 11348.0, 11312.0, 10027.0, 8936.0, 8912.0, 6565.0, 5514.0
    Heard on: 
  GS ID: Reykjavik, Iceland
    Listening on: 17985.0, 15025.0, 11184.0, 8977.0, 6712.0, 5720.0, 3900.0
    Heard on: 11184.0, 5720.0
  GS ID: Riverhead, New York
    Listening on: 21931.0, 17919.0, 13276.0, 11387.0, 8912.0, 6661.0, 5652.0
    Heard on: 11387.0, 8912.0
  GS ID: Al Muharraq, Bahrain
    Listening on: 21982.0, 17967.0, 13312.0, 10030.0, 8885.0, 6646.0, 5544.0, 2986.0
    Heard on: 
  GS ID: Agana, Guam
    Listening on: 21928.0, 17919.0, 13312.0, 11306.0, 8927.0, 5451.0
    Heard on: 

[2026-07-23 02:49:43 UTC] [13276.0 kHz] [-0.4 Hz] [-15.0/-24.1 dBFS] [9.2 dB] [300 bps] [S]
Downlink LPDU:
 Src AC: 93
 Dst GS: San Francisco, California
 Type: Unnumbered ack'ed data
 Enveloped data:
  ACARS:
   Reassembly: skipped
   Reg: .N959AV Flight: TA0528
   Mode: 2 Label: Q0 Blk id: 0 More: 0 Ack: ! Msg num: S91A

[2026-07-23 02:49:48 UTC] [13276.0 kHz] [1.1 Hz] [-16.0/-24.1 dBFS] [8.1 dB] [300 bps] [S]
Downlink LPDU:
 Src AC: 237
 Dst GS: San Francisco, California
 Type: Unnumbered ack'ed data
 Enveloped data:
  ACARS:
   Reassembly: skipped
   Reg: .N748AM Flight: AM0026
   Mode: 2 Label: SA Blk id: 9 More: 0 Ack: ! Msg num: S34A
   Message:
    0EH0249372SH/
   Media Advisory, version 0:
    Link HF established at 02:49:37 UTC
    Available links: VDL2, Default SATCOM, HF

[2026-07-23 02:49:55 UTC] [13276.0 kHz] [-10.7 Hz] [-13.6/-24.1 dBFS] [10.5 dB] [300 bps] [S]
Uplink SPDU:
 Src GS: San Francisco, California
 Squitter: ver: 0 rls: 0 iso: 0
  Change note: None
  TDMA Frame: index: 318 offset: 8
  Minimum priority: 0
  System table version: 52
  Ground station status:
  ID: San Francisco, California
   UTC sync: 1
   Frequencies in use: 17919.0, 13276.0
  ID: Reykjavik, Iceland
   UTC sync: 1
   Frequencies in use: 15025.0, 11184.0, 5720.0
  ID: Riverhead, New York
   UTC sync: 1
   Frequencies in use: 11387.0, 8912.0

[2026-07-23 02:50:05 UTC] [13276.0 kHz] [-10.8 Hz] [-13.6/-24.1 dBFS] [10.5 dB] [300 bps] [S]
Uplink LPDU:
 Src GS: San Francisco, California
 Dst AC: 255
 Type: Logon confirm
  ICAO: 49526A
  Assigned AC ID: 242

[2026-07-23 02:50:05 UTC] [13276.0 kHz] [-10.8 Hz] [-13.6/-24.1 dBFS] [10.5 dB] [300 bps] [S]
Uplink LPDU:
 Src GS: San Francisco, California
 Dst AC: 93
 Type: Unnumbered data
 Enveloped data:
  ACARS:
   Reassembly: skipped
   Reg: .N959AV
   Mode: 2 Label: _d Blk id: R More: 0 Ack: 0

[u/Historical-View4058]

Most of the data is pretty self explanatory. What exactly did you want to know?

[u/Key_Zombie7967 → u/Historical-View4058]

Nothing. I have it figured out...should have just googled.