HF Modes Currently Active
From The RadioReference Wiki
These modes have been reported in various places over the last year or two. Keep in mind that although this mode can be decoded, there are several that are encrypted, and therefore unreadable. One can use analysis tools such as ACF analysis to determine this, but we may never know what such signals are actually saying.
| Mode Name | Synonym | Notes |
|---|---|---|
| ALE | ALE 2G | |
| MIL-STD-188-141A | ||
| ANNEX 10 | ICAO SELCALL | |
| ARQ-E | ARQ-1000D | |
| ARQ-E3 | ||
| BAUDOT | ITA-2 | |
| RTTY | ||
| CCIR493-4 | ||
| CIS Modes | ||
| CLOVER | Q-CLOVER | |
| QUAD-CLOVER | ||
| 8 TONE CLOVER | ||
| CODAN | ||
| DGPS | ||
| DPRK ARQ | ||
| FAX | ||
| FSK100 | POL-FSK | |
| GMDSS/DSC | ||
| HFDL | HF ACARS | |
| LINK11 | ALLIGATOR | |
| TADIL-A | ||
| MIL STD 188 110A | ANDVT | |
| NATO 75/100 | BEAVER? | |
| LINK4? | ||
| CRATT | ||
| RATT | ||
| PACKET | ||
| PACTOR | Several variants | |
| QPSK1500 | Mode used by Japanese Slot Machine | |
| RDFT | Mode used by HM-01 | |
| SITOR-A | AMTOR MODE A | |
| ARQ | ||
| SITOR-ARQ | ||
| TOR | ||
| SITOR-B | AMTOR MODE B | |
| FEC | ||
| NAVTEX | A broadcast mode built on SITOR-B - see article | |
| SITOR-FEC | ||
| STANAG | Several variants - 4285 and 4481 are common | |
| VOICE FREQUENCY TELEGRAPHY (VFT) |