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Author Topic: 6775 Serdolik or VARA  (Read 637 times)

Offline UtilitySeattle

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6775 Serdolik or VARA
« 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-20220213-161603-6775000hz
« Last Edit: February 14, 2022, 0032 UTC by UtilitySeattle »
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Offline UtilitySeattle

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Re: 6775 Serdolik or VARA
« Reply #1 on: February 14, 2022, 0108 UTC »
All activity suddenly stopped at 01:05 UTC.
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Offline ~SIGINT~

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Re: 6775 Serdolik or VARA
« Reply #2 on: February 14, 2022, 0125 UTC »

Offline UtilitySeattle

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Re: 6775 Serdolik or VARA
« Reply #3 on: February 14, 2022, 0918 UTC »
Sounds like Domino.  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.
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Offline UtilitySeattle

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Re: 6775 Serdolik or VARA
« Reply #4 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
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Offline alleycat

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Re: 6775 Serdolik or VARA
« Reply #5 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) 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?
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Offline MegatonRange

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Re: 6775 Serdolik or VARA
« Reply #6 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.
« Last Edit: May 08, 2022, 1929 UTC by MegatonRange »

Offline MegatonRange

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Re: 6775 Serdolik or VARA
« Reply #7 on: May 08, 2022, 1939 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
---
HF VARA again. After linking several modulation methods are used to pass traffic.

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