[Milsurplus] [ARC5] ARR-3 Question

[Hubert Miller]

Well, how interesting. I would have thought the sonobuoy pickup were all low frequency sounds.
I think I recently read, in a book about the Battle of Atlantic, the 'propeller cavitation sounds' were
up around 17,000 Hz ?
Lacking smarter inputs, I would have guessed it was some kind of contractual moneymaker.
-Hue
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