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Author Topic: Unid 11318 dig (2-second bursts preceded by short tone)  (Read 1161 times)

Offline alleycat

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Unid 11318 dig (2-second bursts preceded by short tone)
« on: February 27, 2022, 0346 UTC »
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:
allen lutins - KC2KLC
Binghamton, NY
Yaesu FT-897D, RTL-SDR Blog V3 & SDRPlay RSP1A
G5RV Jr dipole & Grove Omni-II discone
eQSLs welcome: kc2klc@lutins.net

Offline ~SIGINT~

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Re: Unid 11318 dig (2-second bursts preceded by short tone)
« Reply #1 on: February 27, 2022, 0355 UTC »
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)

Offline alleycat

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Re: Unid 11318 dig (2-second bursts preceded by short tone)
« Reply #2 on: February 27, 2022, 0547 UTC »
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
allen lutins - KC2KLC
Binghamton, NY
Yaesu FT-897D, RTL-SDR Blog V3 & SDRPlay RSP1A
G5RV Jr dipole & Grove Omni-II discone
eQSLs welcome: kc2klc@lutins.net

Offline CoryD81

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Re: Unid 11318 dig (2-second bursts preceded by short tone)
« Reply #3 on: April 12, 2022, 0037 UTC »
The program Sorcerer among others decodes this mode quite well. Free too.

 

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