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Comment Re:What were the pings then? (Score 1) 245

Specified frequency is 37.5 kHz ± 1kHz

http://en.wikipedia.org/wiki/U...

Search teams picked up two signals on April 5 at a frequency of 33.5kHz before two more were received three days later at 27kHz.

While both are significantly lower than the 37.5kHz frequency black box beacons are designed to emit, the April 5 signals are still possible, down perhaps to weakening batteries or the 'vagaries of deep-sea conditions'.

http://www.dailymail.co.uk/new...

Buoys tend to move around and some get lost, so that could account for the 27kHz signals.

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