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Loggings => HF Mystery Signals => Topic started by: ulx2 on September 10, 2021, 2326 UTC

Title: UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021
Post by: ulx2 on September 10, 2021, 2326 UTC

Unidentified 12 kHz wide signal on 5125 kHz, started with carrier at 2147 UTC and covered Charleston Radio International on 5135 kHz. I have never seen this mode before.

Waterfall screenshots:

(https://drive.google.com/uc?export=download&id=1V9dUIdfNT67eTUdvWJE6oW_WXsa4AGM1)
(https://drive.google.com/uc?export=download&id=1WbYgLsPBj-_FjPwdk6FhTmmhn_vGYfdX)
(https://drive.google.com/uc?export=download&id=1mMPeknHHqf6kByzArKLvwCfo4kz5lD5b)

Title: Re: UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021
Post by: Token on September 11, 2021, 1413 UTC

I do not know the "real" name of this mode, but it is Russian and it is sometimes called "CIS 4FSK 150Bd", "CIS MFSK-4", or "CIS FTM-4".

Note the resting freq of 5125 kHz, and then the 4 FSK channels with 4 kHz shift between them, for a total tone width of 12 kHz.

This mode has been around for years, but is not common.

I have a brief video of it on my YouTube channel.  But I really need to do a more detailed video...one day.
https://www.youtube.com/watch?v=Wq-mAr0qS3s

T!

Title: Re: UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021
Post by: ulx2 on September 11, 2021, 2306 UTC

Thank you for the explanation, Token! Yes, it sounds like on your clip.