The radio signals which are interfering could be shortwave.

I would recommend using ferrite clamps on the cables which do not carry
digital signals, especially those in the most sensitive area, like
from the hydrophone and pre-amp. Also the pre-amp power cable, if it is
not battery powered.

And screen the pre-amp, if it is not in a metal
box. The pre-amp itself ought to have provisions for preventing this,
like a low-pass filter at the input.

MatN
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