HFDL - High Frequency Data Link

"High Frequency Data Link (HFDL) is an ACARS communications media used to exchange data such as Aeronautical Operational Control (AOC) messages, Controller Pilot Data Link Communication (CPDLC) messages and Automatic Dependent Surveillance (ADS) messages between aircraft end-systems and corresponding ground-based HFDL ground stations. Using the unique propagation characteristics of high-frequency radio waves, the ground stations provide data link communications to properly equipped aircraft operating anywhere in the world. The result, pilots can always communicate with someone on the ground." -- Wikipedia

By default, HFDL uses a rate of 1800 baud. Due to the nature of HF, this rate can vary. Speeds of 1200, 600 and 300 baud are possible too. Have a look at the Global Frequency Database to find the HFDL frequencies along with some recorded samples of that mode. HFDL can be decoded by anyone using (Windows) software like PC-HFDL.

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