HFU HF Underground

Loggings => HF Mystery Signals => Topic started by: UtilitySeattle on February 14, 2022, 0021 UTC

Title: 6775 Serdolik or VARA
Post by: UtilitySeattle on February 14, 2022, 0021 UTC
6775 US 00:10 UTC Feb 14 2022 Not sure which mode this is. I hear it often. Can you have a listen oh experienced onbes and shed some light? The freq is listed as CW Japan Self Defense.

https://soundcloud.com/bubba-seattle/sdruno-20220213-163119-6775000hz (https://soundcloud.com/bubba-seattle/sdruno-20220213-163119-6775000hz)
https://soundcloud.com/bubba-seattle/sdruno-20220213-161603-6775000hz (https://soundcloud.com/bubba-seattle/sdruno-20220213-161603-6775000hz)
Title: Re: 6775 Serdolik or VARA
Post by: UtilitySeattle on February 14, 2022, 0108 UTC
All activity suddenly stopped at 01:05 UTC.
Title: Re: 6775 Serdolik or VARA
Post by: ~SIGINT~ on February 14, 2022, 0125 UTC
Sounds like Domino.  https://www.sigidwiki.com/wiki/DominoEX (https://www.sigidwiki.com/wiki/DominoEX)
Title: Re: 6775 Serdolik or VARA
Post by: UtilitySeattle on February 14, 2022, 0918 UTC
Quote from: ~SIGINT~ on February 14, 2022, 0125 UTC
Sounds like Domino.  https://www.sigidwiki.com/wiki/DominoEX (https://www.sigidwiki.com/wiki/DominoEX)

Oh, good ear. Out of ham bands though. Wonder if it's peskies or pirates  :o I'll have to give it a go with decoding with MultiPSK.
Title: Re: 6775 Serdolik or VARA
Post by: UtilitySeattle on February 21, 2022, 2201 UTC
Heard again today 21:55 UTC Feb 21 2022 new recording. They added another digital mode to the mix?
Recording of the unid.

https://soundcloud.com/bubba-seattle/sdruno-20220221-135752-6775000hz?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing (https://soundcloud.com/bubba-seattle/sdruno-20220221-135752-6775000hz?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing)
Title: Re: 6775 Serdolik or VARA
Post by: alleycat on March 14, 2022, 0124 UTC
I just received a similar set of short data bursts (audio at https://www.lutins.org/sdr/6775_unid_data.mp3 (https://www.lutins.org/sdr/6775_unid_data.mp3)) on the same frequency at 2356 GMT on 13 Mar 2022. When decoding Domino, MultiPSK is limited to 22 baud, and the bandwidth of this signal suggests the baud rate is higher. I tried decoding with FLDIGI (allows up to 88 baud), but couldn't get a decode on my recording nor yours. Either encrypted, or another, similar mode?
Title: Re: 6775 Serdolik or VARA
Post by: MegatonRange on May 08, 2022, 1924 UTC
That looks & sounds like a 500 Hz VARA transmission, plus 6775.0 USB is a known frequency carrying HF VARA. In addition to 6775.0, you can find HF VARA on 3391.0, 4560.0, 4906.0, 7860,0, 9217.0 & 10267.0, all USB.
Title: Re: 6775 Serdolik or VARA
Post by: MegatonRange on May 08, 2022, 1939 UTC
Quote from: UtilitySeattle on February 21, 2022, 2201 UTC
Heard again today 21:55 UTC Feb 21 2022 new recording. They added another digital mode to the mix?
Recording of the unid.

https://soundcloud.com/bubba-seattle/sdruno-20220221-135752-6775000hz?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing (https://soundcloud.com/bubba-seattle/sdruno-20220221-135752-6775000hz?utm_source=clipboard&utm_medium=text&utm_campaign=social_sharing)
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HF VARA again. After linking several modulation methods are used to pass traffic.

https://www.sigidwiki.com/wiki/VARA_HF