HF Modes Currently Active
From The RadioReference Wiki
These modes have been reported in various places over the couple of years. Keep in mind that although a particular 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.
We have pages set up with just waterfalls (useful for quick searches) here;
The PACTOR references are shown in bold will redirect to the HF Digital Amateur Radio article on this wiki to link to articles that describe the protocols in more detail. PACTOR1 through 3 have been known to be used in the amateur radio service, as well as in the maritime service, as noted. ALE has also been known to be used in the amateur service.
'Last Seen' references are the last time this mode was seen in the UDXF logs.
Contents
Active Modes
| Mode or Description | Synonym | Notes | Waterfall Page |
|---|---|---|---|
| ARINC 635 | HFDL | HFDL Waterfall | |
| HF ACARS | |||
| HF DATALINK | |||
| BAUDOT | ITA-2 | misnomer; ITA2 is coding scheme. | Baudot Waterfalls |
| RTTY | |||
| CCIR493-4 Selcall | CODAN 8580 | Chinese usage? | CCIR493 Waterfall |
| CLOVER-2000 | X-CLOVER | Noted being used by Arabic lang net 2024 | |
| 8 TONE CLOVER | |||
| Codan 9001/3021 16 Tone Modems | Used by Bangla Navy and Egypt diplo | CODAN 16 Tone Waterfall | |
| CW | Morse | heavily used by Russ Mil (AF, etc.) | CW Waterfall |
| FAX | FAX Waterfall | ||
| FSK100 | POL-FSK | Uses 63bd/125bd; BPSK/QPSK too; Enigma P03 | FSK100 Waterfalls |
| AK10 | per Hoka | ||
| GMDSS/DSC | Maritime Selcall | GMDSS DSC Waterfall | |
| Japanese Slot Machine | Mode is QPSK1500 | QPSK1500 Waterfall | |
| KEGURI | DPRK 600 ARQ | DPRK 600 Waterfall | |
| MIL-STD-188-110A | encrypted | ||
| MIL-STD-188-141A (ALE) | 2G ALE | wide use by NGO,Military some ham | ALE 2G Waterfall |
| MIL-STD-188-203-1A | ALLIGATOR | encrypted | Link11 Waterfalls |
| Link-11 | |||
| TADIL-A | |||
| NAVTEX | A broadcast mode built on SITOR-B | NAVTEX Waterfall | |
| RDFT | Was used by HM01, now Bulgarian Diplo | HM01 RDFT Waterfall | |
| SITOR-A | AMTOR MODE A | some maritime, Egyptian use | SITOR-A Waterfalls |
| ARQ | |||
| SITOR-ARQ | |||
| TOR | |||
| SITOR-B | AMTOR MODE B | SITOR-B Waterfall | |
| FEC | |||
| SITOR-FEC | |||
| STANAG 4285 | encrypted. See the UDXF files area for freqs | STANAG 4285 Waterfall | |
| STANAG 4481 | CRATT | encrypted. See here for frequencies | STANAG 4481 Waterfalls |
| LINK-4 | |||
| NATO-75 | |||
| RATT | |||
| WinDRM | Mode used by HM-01; First noted Jan 2024 |
HF Trading
- Greater Chicago HF Trading Stations (PDF)
- Recordings for the above (Zipped)
- See the More HF Trading thread on the UDXF reflector on groups.io for more information. You must be a member to view this thread.
Sporadically Active Modes
These modes have been reported occasionally over several months. Some may have been just tests; whether they'll show up in the future is anyone's guess. Text is always encrypted and can't be read, though it can be decoded in many cases.
| Mode or Description | Synonym | Notes | Waterfall Page |
|---|---|---|---|
| Australian Forces 50bd/600bd | |||
| Chinese 4 plus 4 Modem | last seen Feb 2021 | ||
| CODAN | last seen Oct 2020 | CODAN Chirp Waterfall | |
| Israeli Navy Hybrid 188-110 MOD | HF Underground Mar 2020 | Israeli Navy Waterfall | |
| Japanese Mil 8-FSK | encrypted- last seen Nov 2020 | Jap 8Tone Waterfall | |
| KEGURI | DPRK 1200 | last seen Jan 2019 | DPRK 1200 Waterfall |
| MIL-STD-188-110 hybrid | last seen July 2019 | ||
| MIL-STD-188-110B | last seen June 2021 | ||
| MIL-STD-188-110C | last seen Feb 2019 | ||
| PACTOR-II FEC | via I5-56578 Antonio Digital blog | ||
| PACTOR IV | used in the maritime svc | ||
| Saab Grintek MHF50 MFSK Modem | logs Nov 2020 | MHF50 Waterfall | |
| STANAG 4197 | ANDVT | Last reported Oct 2021 | ANDVT Waterfall |
| STANAG 4538 | 3G ALE | last seen Dec 2019 | |
| STANAG 4539 | MIL-STD-188-110B/C App C | last Seen Oct 2019 | MIL 188110C Waterfall |
| 110C WB | |||
| Thalex HFXM modem | Salamandre | mentioned on list 2/2023 | |
| Thales Systeme 3000 Skymaster | Systeme 3000 Waterfall |
Amateur Related Modes Used by Other Entities
These modes have been reported once in a while by SHARES, MARS or the ICRC. Their use is sporadic at best.
MFSK32 and 64 is currently being used by the Shortwave Radiogram program. Olivia and MT63 has been used in the past. See the Shortwave Radiogram Gateway for more information on this subject.
| Mode or Description | Synonym | Notes | Waterfall Page |
|---|---|---|---|
| AX.25 300bd FSK Packet Radio | AX.25 | Noted in use Dec 2024 by unk agnecy | |
| PACKET | |||
| MFSK16 | |||
| MT-63 | |||
| OLIVIA | |||
| PACTOR-I | used in the maritime svc | ||
| PACTOR-II | used in the maritime svc | ||
| PACTOR-III | used in the maritime svc - often encrypted | ||
| PSK31 | |||
| WinMOR |
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