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Author Topic: UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021  (Read 423 times)

Offline ulx2

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UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021
« 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:




« Last Edit: September 11, 2021, 0033 UTC by ulx2 »
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/

Offline Token

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Re: UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021
« Reply #1 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!
« Last Edit: September 12, 2021, 0027 UTC by Token »
T!
Mojave Desert, California USA

Offline ulx2

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Re: UNID wideband UTE 5125 USB 2147 UTC 10 Sep 2021
« Reply #2 on: September 11, 2021, 2306 UTC »
Thank you for the explanation, Token! Yes, it sounds like on your clip.
LOC: Kyiv, Ukraine
RX1: Degen DE-1103 portable
RX2: Xhdata D-808 portable
RX3: Airspy Mini SDR + Spyverter
ANT1: 80 mb dipole
ANT2: Long wire (10 meters)
ANT3: Homemade M0AYF active loop
ACC: Homemade passive preselector & phasing device

https://udxb.blogspot.com/