PC-HFDL Posted in Ham Radio Software Even if outdated (2002) and unsupported this freeware acars program promise to do the job. HFDL is a HF data link protocol, defined in ARINC spec 635-3 Developed by Charles Brain. Donwload PC-HFDL Related Posts via TaxonomiesYaesu FT-991 Memory ManagerYagi Designer 2.0D-Rats 0.3.3 DownloadHam Radio Deluxe 5WSJT-X not decoding – SolvedFrequency FilerSuper Morse for MSDOSWinPSKseKenwood Smart Memory KSMTS-870S Remote control