I first heard this communication link in eastern Connecticut on 1-5-26 at ~7pm till ~9pm. Centered on 9.067. mhz. Looking over at signalwiki, and a couple PDFs posted here about HF trading links didn't result in any matches. First time I caught it and last time as well..
Appears to be 1 way data transfer with an ending tone, could be path probing. Some packets sound different, in total I heard about 3 different types of continuous transfers. Have not heard it since. Please excuse the clipping in the audio samples, SDR++ CE has audio buffer issues on MacOS, the original SDR++ does not and I've switched to that. Hopefully next time I can get better recordings with an IQ stream.
Love the sound of the ending tone though. It sounds exactly like an MRI haha. Take all this with a grain of salt, I'm just someone with an SDR and a YouLoop who normally listens to Aero HF Radio.
This video shows quick data bursts.
1) First I Saw these spaced bursts.
1a) Zoomed in
2) Then comes maybe a path probe and a bunch of carriers. Maybe each tone is a separate data channel
4) after that, maybe muliple data transfer channels actually transferring information.
5) then short Bursts.
Appears to be 1 way data transfer with an ending tone, could be path probing. Some packets sound different, in total I heard about 3 different types of continuous transfers. Have not heard it since. Please excuse the clipping in the audio samples, SDR++ CE has audio buffer issues on MacOS, the original SDR++ does not and I've switched to that. Hopefully next time I can get better recordings with an IQ stream.
Love the sound of the ending tone though. It sounds exactly like an MRI haha. Take all this with a grain of salt, I'm just someone with an SDR and a YouLoop who normally listens to Aero HF Radio.
This video shows quick data bursts.
1) First I Saw these spaced bursts.
1a) Zoomed in
2) Then comes maybe a path probe and a bunch of carriers. Maybe each tone is a separate data channel
4) after that, maybe muliple data transfer channels actually transferring information.
5) then short Bursts.
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