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 wideband UTE 5125 USB 2147 UTC 10 Sep 2021  (Read 1553 times)

Offline ulx2

  • Hero Member
  • *****
  • Posts: 658
  • Kyiv, Ukraine
    • View Profile
    • My DX blog
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

  • Global Moderator
  • DX Legend
  • *****
  • Posts: 2118
    • View Profile
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

  • Hero Member
  • *****
  • Posts: 658
  • Kyiv, Ukraine
    • View Profile
    • My DX blog
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/

 

HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns