Author Topic: The great Dunkirk audio mystery  (Read 790 times)

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Offline NeperTopic starter

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The great Dunkirk audio mystery
« on: June 12, 2022, 06:54:49 pm »
A few ears ago, this contraption

1510216-0

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?
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Offline strawberry

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Re: The great Dunkirk audio mystery
« Reply #1 on: June 12, 2022, 07:11:21 pm »
bird sausage making machine
high power ultrasound (some harmonics/resonance can probably hear)
could be some binary ASCII code
 

Online MK14

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Re: The great Dunkirk audio mystery
« Reply #2 on: June 12, 2022, 10:06:23 pm »
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
 

Online radar_macgyver

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Re: The great Dunkirk audio mystery
« Reply #3 on: June 12, 2022, 10:20:54 pm »
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.
« Last Edit: June 12, 2022, 10:30:24 pm by radar_macgyver »
 
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Offline NeperTopic starter

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Re: The great Dunkirk audio mystery
« Reply #4 on: June 13, 2022, 09:49:47 am »
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.

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

Thanks a lot.
« Last Edit: June 13, 2022, 02:49:26 pm by Neper »
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