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Loggings => HF Mystery Signals => Topic started by: UtilitySeattle on October 27, 2022, 0022 UTC

Title: UNID 14880 USB October 27 2022 00:00 UTC
Post by: UtilitySeattle on October 27, 2022, 0022 UTC: Can't seem to find this one on the Signal Identification Wiki. Very strong with deep fades so not QRM. 4K wide, see pic. Any help would be appreciated. QTH and specifics in my tag. Off at 00:30 UTC

https://prnt.sc/528xhZlrXdpM (https://prnt.sc/528xhZlrXdpM)

https://voca.ro/1h3DonXU9eWU (https://voca.ro/1h3DonXU9eWU)
Title: Re: UNID 14880 USB 0000 UTC 27 OCT 2022
Post by: ~SIGINT~ on October 27, 2022, 0216 UTC: I tried to ID the sound clip but the hosting service gives me a "Failed - Forbidden" when I try to download the file for further analysis. It almost sounds like an over-the-horizon radar but I'm not sure.
Title: Re: UNID 14880 USB October 27 2022 00:00 UTC
Post by: Token on October 27, 2022, 1034 UTC: Quote from: UtilitySeattle on October 27, 2022, 0022 UTC
Can't seem to find this one on the Signal Identification Wiki. Very strong with deep fades so not QRM. 4K wide, see pic. Any help would be appreciated. QTH and specifics in my tag. Off at 00:30 UTC

https://prnt.sc/528xhZlrXdpM (https://prnt.sc/528xhZlrXdpM)

https://voca.ro/1h3DonXU9eWU (https://voca.ro/1h3DonXU9eWU)

This is the signal I call the "MFSK Oddity" in my logs. It is almost certainly (although not proven) associated with the HFT (High Frequency Trading) stations that are popping up on HF. The version in your screen capture and audio clip is only one type of this signal, it is seen in various widths and rates, from about 2.6 kHz wide to over 20 kHz wide, and from rates as low as one bit per second to as fast as 100 per second. This signal has been around in various formats for a couple years or more.

Some of my recordings of this signal in this post:
https://www.hfunderground.com/board/index.php/topic,94727.0.html

T!
Title: Re: UNID 14880 USB October 27 2022 00:00 UTC
Post by: UtilitySeattle on October 27, 2022, 2049 UTC: Thanks folks. Appreciate the input.
Title: Re: UNID 14880 USB October 27 2022 00:00 UTC
Post by: UtilitySeattle on October 28, 2022, 2102 UTC: October 28 2022 21:00 UTC Same frequency. Now hearing a deep tone water dripping signal. Fairly regular. Pitch changes but that might be propagation at work. Vey weak, in the noise at S$

https://prnt.sc/-UrazLitYFv3 (https://prnt.sc/-UrazLitYFv3)
Title: Re: UNID 14880 USB October 27 2022 00:00 UTC
Post by: Token on October 28, 2022, 2200 UTC: Quote from: UtilitySeattle on October 28, 2022, 2102 UTC
October 28 2022 21:00 UTC Same frequency. Now hearing a deep tone water dripping signal. Fairly regular. Pitch changes but that might be propagation at work. Vey weak, in the noise at S$

https://prnt.sc/-UrazLitYFv3 (https://prnt.sc/-UrazLitYFv3)

You don't happen to have an audio recording of it do you? I strongly suspect that this is the same MFSK Oddity signal, just at the much slower rate of 1 Hz or so. Compare what you heard to my recording here: https://www.youtube.com/watch?v=wdzHIOUuJ-c

Keep in mind mine may sound slightly different due to filter bandwidth and mode settings.

T!
Title: Re: UNID 14880 USB 0000 UTC 27 OCT 2022
Post by: ~SIGINT~ on October 28, 2022, 2317 UTC: I had a listen around 21:13 UTC 28 Oct 2022 and I was getting a "pulser" centered around 14879.0 kHz. Notice the 4 "pulses" in the waterfall display below. To the left of that at 14860.0 kHz is a High Frequency Trading (HFT) station.

(http://www.milspec.ca/board/img/2022-10-28_171351.png)