Loggings > HF Mystery Signals

Unid 11318 dig (2-second bursts preceded by short tone)

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alleycat:
Approximately 2.4 kHz wide, 2-second long digital bursts preceded by a very brief tone; usually individual bursts, but sometimes 2 in a row. Closest match I can find on SigIDWiki is STANAG 4197, but 4197 appears to have a multiple-frequency opening tone, whereas my signal has a single tone.
Audio clip: https://www.lutins.org/temp/sdr/11318_burst.mp3
Waterfall:

~SIGINT~:
This is HFDL - High Frequency Data Link, the HF version of ACARS.

High Frequency Data Link
https://en.wikipedia.org/wiki/High_Frequency_Data_Link

https://www.sigidwiki.com/wiki/High_Frequency_Data_Link_(HFDL)

alleycat:
Thanks! At one point in the past I had actually decoded HFDL signals using PC-HFDL, but it's been so long I forgot what I was hearing. Just used MultiPSK to successfully decode this one. There's so many modes it's hard to keep track of them all - I really appreciate your fast & helpful input! 73 de KC2KLC

CoryD81:
The program Sorcerer among others decodes this mode quite well. Free too.

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