Quote:
Originally Posted by Paulebaer1979
A ship near your sub is only able to hear your active-sonar (depth under keel) if it has a passive sonar for the frequence of your active sonar. If not, it canīt find you, because the frequence of the echolot is in frequence which humans canīt hear - dogs perhaps, but they do not sit at an sonar operator desk.
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The ASDIC search beam frequency was well above human heaing range. The ping-ping-ping is a Hollywood thing, just as (apparently) is the single ping from the Echolot. So it's hardly a safe bet that the British DDs wouldn't be able to catch the Echolot xmission.