We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissible in your locale.

Author Topic: Unid 11318 dig (2-second bursts preceded by short tone)  (Read 1209 times)

Offline alleycat

  • Full Member
  • ***
  • Posts: 245
  • Binghamton, NY
    • View Profile
    • KC2KLC ham radio page
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
Rigs: Yaesu FT-897D, Elecraft KX3, RTL-SDR Blog V3 & SDRPlay RSP1A
Antennas: G5RV Jr dipole, Alpha Antenna EZMilitary portable vertical & Grove Omni-II discone
eQSLs welcome: kc2klc@lutins.net

Offline ~SIGINT~

  • DXing Phenomena
  • *******
  • Posts: 4245
  • N.E. Canada (FN08)
  • .ılılı..ılılı..ılılı..ılılı..ılılı..ılılı.
    • View Profile
    • Milspec Communication Canada
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

  • Full Member
  • ***
  • Posts: 245
  • Binghamton, NY
    • View Profile
    • KC2KLC ham radio page
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
Rigs: Yaesu FT-897D, Elecraft KX3, RTL-SDR Blog V3 & SDRPlay RSP1A
Antennas: G5RV Jr dipole, Alpha Antenna EZMilitary portable vertical & Grove Omni-II discone
eQSLs welcome: kc2klc@lutins.net

Offline CoryD81

  • Newbie
  • *
  • Posts: 2
    • View Profile
    • Email
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.