From The RadioReference Wiki
Please see the SigIDWiki definition for HFDL for a technical description, software and additional information
A waterfall for HFDL can be found here
- Additional Links from the UDXF website
- Aeronautical Frequencies (HF and others) (PDF)
- The HF frequencies listed above reflect Table 49, which is old. A more up to date sites listing can be found here as a zip file. It also contains a file that can be used in the registered version of PC-HFDL.
- High Frequency Data Link (via SigID Wiki)
- What is HFDL? (PDF)
- HFDL - Some Ideas (PDF)
- ICAO Aeronautical Communications Vol. 2 (PDF)
PC-HFDL is a Windows software to decode HFDL data traffic and has been written by Charles Brain. Just feed the HF receiver speaker's output into the soundcard of a Windows PC. It can be downloaded from the HFDL Yahoo group.
The best monitoring results will be achieved with the following PC-HFDL settings:
- PREAM ON - to control the audio offset of the receiver
- SPDU OFF - only needed temporarily ON to see the squitters of a new unknown ground station
- MPDU ON - see the MPDU packets
- LPDU ON - see the LPDUs within the MPDUs
- BDU ON - see the BDUs
- VERB ON - see more details
- HFNPDU ON - see the routine position reports
- HEX OFF - only needed for debugging purposes
So in short, with all options ON except SPDU and HEX, the complete session can be seen: LOG-ON of the aircraft to the ground station giving its 24bit ICAO-ID, the assignment of the 1byte sequence ID number to the given ICAO-ID by the ground station referenced in all subsequent traffic, clear distinction of MPDU packets containing more than just one LPDU, and full traffic details.
The .dat file that can be used with the registered version of PC-HFDL can be had by joining the HFDL Yahoo group and requesting one via private mail. It will NOT work with the free version.