Here is an oddity from last night. I have read about "feedback/whales" stations mentioned on various newsgroups, but this the first time I have picked one up.
Audio: 6837_Unid_Whale_Signal.mp3
Audio: 6837_Unid_Whale_Signal.mp3
6837
- Thread starter brandon
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ridgescan
Member
That sounded eerie and majestic! Is that USB? I am not getting it here.
ka3jjz
Wiki Admin Emeritus
Yeah, I've heard this too. It was quite the mystery for a time, until someone discovered that it was a feedback loop in a HF relay line that was causing it. This was briefly discussed on the UDXF Yahoo group fairly recently.
Nonetheless, it's eerie....73 Mike
Nonetheless, it's eerie....73 Mike
ridgescan
Member
Yup I heard it sooo faintly on the R75 at 7:24PM here.
ridgescan
Member
I turned on the R75 for bedtime and still had it tuned to this. I caught it good this time
It's very strong here as well, even at 0800z on 8/25/10.
Here's my video of it: YouTube - Mystery Signal
I think it's likely a new type of speech inversion. You can see the secondary signal after it and I think this is the actual speech signal getting converted. That's my best guess.
It could always be some kind of transponder but I don't think so.
Here's my video of it: YouTube - Mystery Signal
I think it's likely a new type of speech inversion. You can see the secondary signal after it and I think this is the actual speech signal getting converted. That's my best guess.
It could always be some kind of transponder but I don't think so.
ka3jjz
Wiki Admin Emeritus
It's generally thought to be a feedback loop in a relay to a HF transceiver. A lot of folks thought it was some sort of speech inversion or something more suspicious; I wish I could put my fingers on the original postings that detailed how someone dug this info up, but it's been way too long ago....73 Mike
I found this link: Whale Sound Station
The audio sample from this link sounds quite a bit different. The one Brandon discovered sounds more mechanical.
The audio sample from this link sounds quite a bit different. The one Brandon discovered sounds more mechanical.
To nickcarr
nickcarr that is one crazy sound lol, sounds like something out of a horror movie!
reminds me of the scene from "Signs" with the baby monitor.
nickcarr that is one crazy sound lol, sounds like something out of a horror movie!
reminds me of the scene from "Signs" with the baby monitor.
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Hooligan
Member
The original discussion of this sort of signal that I'm aware of took place about 15+ years or so ago when I was on WUN or MILCOM & such a signal was on the 8972USB USN Safety of Flight channel pretty much 24-7.
I created, or responded to a posting about the noise indicating it *sounded to me* like an audio loopback -- a receiver on the same freq was somehow causing a transmitter in the same room to key up & thus the audio feedback was modulating the SSB transmitter/exciter.
I spoke with the FCC Watch Officer, who tuned it in, ID'ed the location as Driver, Virginia (the major USN LF/HF transmit site, now a park!) & said it sounded like a "LINCOMPEX" (linked compression & expansion) modulation scheme to him.
I have no idea how the USN could be irresponsible enough to have such an emitter accidently or deliberately on the air for months or years on what was an important voice (non-secure & PARKHILL secure) for them.
That signal sounded quite a bit different than the 6837 emissions, but it has the same basic feel to it.
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