HFU HF Underground

Loggings => HF Mystery Signals => Topic started by: UtilitySeattle on July 23, 2024, 2211 UTC

Title: 17.446500 MHz 07/23/2024 22:00 UTC Odd signal
Post by: UtilitySeattle on July 23, 2024, 2211 UTC
Not seen this one before. Thought it was QRM but then the fading. Here is a 60 second recording and some screen grabs.

https://voca.ro/18i24LyndhSa

https://prnt.sc/pE5GHsvVhWbf
https://prnt.sc/SwhqSecMF0-j
Title: Re: 17.446500 MHz 07/23/2024 22:00 UTC Odd signal
Post by: BoomboxDX on July 25, 2024, 0032 UTC
Sounds like it may have been propagating. Any idea of the changes in signal strength?
Title: Re: 17.446500 MHz 07/23/2024 22:00 UTC Odd signal
Post by: UtilitySeattle on July 25, 2024, 0801 UTC
Just over the noise floor for the most part. Would get strong enough to get 1 S unit over the floor and then fade down to just barely audible.
Title: Re: 17.446500 MHz 07/23/2024 22:00 UTC Odd signal
Post by: northern_dxer on July 25, 2024, 2136 UTC
The spectrum looks similar to a signal that I have observed several times on broadcast frequencies. Many evenly spaced lines, hard to count the number. I have suspected that it might be a jammer. Or an idling Russian data mode, perhaps with a broken transmitter. But the audio is not quite the same.

I think this one might even be a radar of some kind, but this is just guessing. Possibly a scientific one (ionospheric studies or meteor detection).
Title: Re: 17.446500 MHz 07/23/2024 22:00 UTC Odd signal
Post by: UtilitySeattle on August 15, 2024, 0051 UTC
Getting same on 4.535 at 00:50 UTC. Anyone else?