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HF Modes Currently Active


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 ar 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.

Active Modes

  • As of Jan 2018, using the logs from the UDXF and others.


Mode or Description Synonym Notes Waterfall Page
ARINC 635 HFDL HFDL Waterfall
HF ACARS
HF DATALINK
Australian Forces 50bd/600bd mostly encrypted
BAUDOT ITA-2 misnomer; ITA2 is coding scheme. Baudot Waterfalls
RTTY
Chinese 4 plus 4 Modem
CODAN CHIRP CODAN Chirp Waterfall
CW Morse CW Waterfall
FAX FAX Waterfall
FSK100 POL-FSK Also uses 63bd and 125bd BPSK daily FSK100 Waterfalls
AK10 per Hoka
GMDSS/DSC Maritime Selcall GMDSS DSC Waterfall
Japanese Mil 8-FSK Jap 8Tone Waterfall
Japanese Slot Machine Mode is QPSK1500; heavily encrypted QPSK1500 Waterfall
MIL-STD-188-110A Waterfall de DX Asia
MIL-STD-188-141A 2G ALE ALE ALE 2G Waterfall
MIL-STD-188-203-1A ALLIGATOR Link11 Waterfalls
Link-11
TADIL-A
M823/SC104 DGPS DGPS DGPS Waterfalls
NAVTEX A broadcast mode built on SITOR-B NAVTEX Waterfall
PACTOR-I used in the maritime svc
PACTOR-II used in the maritime svc
PACTOR-III used in the maritime svc - often encrypted
PACTOR-IV used in the maritime svc - often encrypted
RDFT Mode used by HM-01 HM01 RDFT Waterfall
SITOR-A AMTOR MODE A SITOR-A Waterfalls
ARQ
SITOR-ARQ
TOR
SITOR-B AMTOR MODE B SITOR-B Waterfall
FEC
SITOR-FEC
STANAG4197 ANDVT ANDVT Waterfall
STANAG4285 2400bd Modem STANAG 4285 Waterfall
STANAG4481 FSK CRATT STANAG 4481 Waterfalls
LINK-4
NATO-75
RATT
STANAG 5066

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.


Mode or Description Synonym Notes Waterfall Page
CCIR493-4 Selcall CODAN 8580 Misnomer; Radio Modem Name CCIR493 Waterfall
Chinese MFSK PSK-8 last seen Apr 2018
Chinese MFSK last seen May 2018
Chinese 39 tone OFDM last seen Feb 2018
Chinese Selcall last seen Aug 2018
KEGURI DPRK 600 DPRK 600 Waterfall
DPRK 1200 DPRK 1200 Waterfall
MIL-STD-188-110 App B last seen July 2018
MIL-STD-188-110 Hybrid last seen Feb 2018
MIL-STD-188-110A Hybrid last seen Mar 2018
MIL-STD-188-110 Serial Hybrid last seen Jan 2018
MIL-STD 188-110D App.D last seen Apr 2018
MIL-STD-188-141B App. C ALE 3G ALE last seen Apr 2018
Polish FSK 400/800 Polish Intel via I5-56578 Antonio Digital blog-last seen Aug 2018
RS-ARQ ALIS last seen Mar 2018
MERLIN
Saab Grintek MHF50 MFSK Modem last seen Mar 2018 MHF50 Waterfall
Siemens CHP200 CHX200 I5-56578 Antonio Digital blog-last seen Oct 2018 CHP200 Waterfall
STANAG 4539 MIL-STD-188-110B/C App C Seen in Oct 2018 UDXF logs MIL 188110C Waterfall
110C WB
Swiss Forces TmS-430 VFT via I5-56578 Antonio Digital blog-last seen Jul 2018 TMS430 Waterfall
Tadiran Autocall via I5-56578 Antonio Digital blog-last seen Sept 2018 Waterfall de DX Asia
Thales Systeme 3000 Skymaster last seen Feb 2018 Systeme 3000 Waterfall
Voice Frequency Telegraphy (VFT) last seen June 2018

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.


Mode or Description Synonym Notes Waterfall Page
AX.25 300bd FSK Packet Radio AX.25 Protocol Name based off X.25 Standards
PACKET
MFSK16
MT-63
OLIVIA
PSK31
WinMOR



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