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The great Dunkirk audio mystery
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Neper:
A few ears ago, this contraption



was standing in the port of Dunkirk, France, and it made the following noise:

http://www.fotoralf.be/audio/dunkirk_mystery.mp3

The recording covers a complete sequence which repeated itself over and over.

I've been asking ever since in various places online, but so far to no avail. Any idea what this could have been?
strawberry:
bird sausage making machine
high power ultrasound (some harmonics/resonance can probably hear)
could be some binary ASCII code
MK14:
Only guessing. Fish/Whale, deterrent device, to keep them away from the port?

https://www.salmonscotland.co.uk/facts/faqs/fish-health-welfare/how-do-acoustic-deterrent-devices-work
radar_macgyver:
Just based on the shape, I was going to guess it's a wind profiler radar, but those are silent and often have a large equipment van nearby. From the audio recording, I think it's a SODAR. I've never used one, but it fits the descriptions I read online. It looks very similar to a Remtech PA-05, Remtech being a French company.

Edit: found a working datasheet link. It states 9 different frequencies, centered around 1 kHz. Sounds about right. Even the trailer looks similar, with the reflector stripe along the wheel well.
Neper:

--- Quote from: radar_macgyver on June 12, 2022, 10:20:54 pm ---It looks very similar to a Remtech PA-05, Remtech being a French company. ... Even the trailer looks similar, with the reflector stripe along the wheel well.
--- End quote ---

It does indeed. I hereby declare this mystery solved. :-)

Thanks a lot.
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