Milcom Monitoring Post Profiles
- What are Emergency Action Messages (EAM)? Updated 20 September 2021
- UFO Milsat Program
- Fleetsatcom System
- UHF 225-380 MHz Milcom Spectrum Holes: Updated 24 July 2019
- Civilian Air Cargo/Airline/Military Call Signs
- Intl HF Aero Civ/Gov/Mil Frequency List
- USN Aircraft Modex Numbers
- University of Twente Wide Band WebSDR Netherlands
- U.S. Military ALE Addresses
- DoD Air Refueling Frequencies - Update 15 Jul 2016
- COTHEN HF Network – Last Update 23 May 2023
- Monitoring the Civil Air Patrol Auxiliary Update 10 Sep 2016
- US Coast Guard Asset Guide - Update 24 May 2023
- The Spectrum Monitor e-Zine Milcom Column Index - Update 17 January 2022
- The Milcom MT Files (1998-2013) Articles Index
Wednesday, December 04, 2013
Monitoing Military Aircraft Using HFDL Digital Comms
In this digital age we have a lot of ways to monitor military aircraft. Within VHF/UHF you can monitor not only voice comms, but Mode-S and VHF ACARS digital transmissions.
If you monitor HF frequencies for over the horizon comms the most common communications you will encounter are USB voice transmissions. But there is another ACARS style digital stream you can monitor on HF freqs and decode -- HFDL. It has been around for a while, but it is getting more attention by aero monitors now that there are more than 2000 aircraft worldwide that can send and receive HF digital messages and to a network of 15 different stations located worldwide.
I have added a new reference page with the current frequencies in use on HFDL monitoring to our sister blog the BTown Monitoring Post at http://monitor-post.blogspot.com/p/hfdl-system-table-48-frequencies.html. I will be updating that page as necessary so check back often or become a follower of the Btown MP.
In addition to the new ref page above, I have moved our International Aeronautical HF Frequency List and Civilian Air Cargo/Airline and Select Military Call Signs over to the Btown MP at http://monitor-post.blogspot.com/.
I will be using that blog to consolidate all of our new upcoming HF ref pages and future updates to existing ref pages.