Remember, the Ping is 40khz. Beyond Human Hearing Range.
I hope the vessels "listening" for the ping from the black boxes, realize it's at 40khz, so is out of the range of human hearing. It will need to be down converted in order to hear it. As silly as it sounds, the French nuclear sub that went around listening for the ping from AF447, literally listened for it, through their headphones, without alteration, so it's no wonder they never heard it. It needs to be seen on a spectrum analyzer or down converted to human hearing range, unless, of course, you have a dog on board to listen for it.
Last edited by Coagie; 9th Mar 2014 at 13:58.
Reason: Correcting "in" to "is" in title