High Frequency Data Link (HFDL)

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High Frequency Data Link (HFDL)
HFDL.jpg
Frequencies 2.9 MHzMegaHertz (MHz) 10^6 Hz2,900,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
2,900 kHzKiloHertz (kHz) 10^3 Hz
,22 MHzMegaHertz (MHz) 10^6 Hz22,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
22,000 kHzKiloHertz (kHz) 10^3 Hz
2,900 kHzKiloHertz (kHz) 10^3 Hz
2.9 MHzMegaHertz (MHz) 10^6 Hz
22,000 kHzKiloHertz (kHz) 10^3 Hz
22 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range 2.9 MHzMegaHertz (MHz) 10^6 Hz2,900,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
2,900 kHzKiloHertz (kHz) 10^3 Hz
- 22 MHzMegaHertz (MHz) 10^6 Hz22,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
22,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation PSKPhase-Shift Keying
ACF
Bandwidth 2400 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).2.4 kHzKiloHertz (kHz) 10^3 Hz
0.0024 MHzMegaHertz (MHz) 10^6 Hz
2.4 kHzKiloHertz (kHz) 10^3 Hz
0.0024 MHzMegaHertz (MHz) 10^6 Hz
2.4 kHzKiloHertz (kHz) 10^3 Hz
0.0024 MHzMegaHertz (MHz) 10^6 Hz
Location Worldwide
Short Description HFDL, also known as HFHigh Frequency (3-30 MHz)-ACARS, ARINC 753, ARINC 635, and HFHigh Frequency (3-30 MHz) DATALINK,is a data link that aircraft use to communicate short messages over long distances using HFHigh Frequency (3-30 MHz) signals.
I/Q Raw Recording
Audio Sample
HFDL, also known as HFHigh Frequency (3-30 MHz)-ACARS, ARINC 753, ARINC 635, and HFHigh Frequency (3-30 MHz) DATALINK,is a data link that aircraft use to communicate short messages over long distances using HFHigh Frequency (3-30 MHz) signals. HFDL is defined in ARINC spec 753.

Transmissions on HFHigh Frequency (3-30 MHz) are in USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables) on a sub-carrier of 1440 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). with a symbol speed of 1800 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.. Data is sent at 300, 600, 1200 or 1800 bpsBits per second (bps). HFDL can use BPSKBinary Phase-Shift Keying (1 bit per symbol), QPSKQuadrature Phase-Shift Keying (2 bits per symbol), and 8-PSK8-Phase Phase-Shift Keying (3 bits per symbol).


Frequencies[edit]

The current table number is 49 (as of Sept.2014), and the specific frequencies and sites can be found here in PDF format

Samples[edit]

300 bpsBits per second (bps) Short (BPSKBinary Phase-Shift Keying (1 bit per symbol))

600 bpsBits per second (bps) Long (BPSKBinary Phase-Shift Keying (1 bit per symbol))

1200 bpsBits per second (bps) Short (QPSKQuadrature Phase-Shift Keying (2 bits per symbol))

Additional Samples[edit]

Decoding Software[edit]

Hobby Level Software
  • MultiPSK (restricted to 5 minutes in the non-registered version)
  • The most current version of PC-HFDL can be found at the HFDL Yahoo group
  • PlanePlotter (Not a decoder but will show aircraft decoded by PC-HFDL)
  • Sigmira
  • SkySweeper
  • Sorcerer
    • Note: It has been recently discussed on the UDXF Yahoo group that Sorcerer is using an old freq/site list - you may get correct decodes, but not correct site IDs


Professional Equipment/Software

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]