HF Modes Currently Inactive
From The RadioReference Wiki
Many of these modes haven't been used in years. Unfortunately when you buy a decoder like Hoka or Wavecom, you are paying not only for the modes that are active, but for the mostly out-of-date mode decoding as well. Rarely, some of these modes will come to life from time to time, probably to test a circuit, or to supplant a faulty satellite link.
Some of the waterfalls come from the DX Asia site (see the HF Appendix) and are used here for research and historical purposes.
This list can be used to eliminate possible modes used by a mystery signal, enabling one to move onto more productive possibilities.
Bit and ACF Analysis
French Navy 50 Baud
Pactor 1 FEC
CHX200
Notes
- ACFs, Audio used for plotting and some waterfalls courtesy of Mike Chace-Ortiz, used with permission.
- Return to DXing Digital Utilities
- Return to HF Modes List
- Go to HF Modes Currently Active
- Go to CIS Modes
- Go to Voice Scrambling Systems