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Re: More info on Flight 370Mark,
The ELTs are designed to be activated either by impact or by getting wet. Most likely they rely on surface water to close a circuit that activates a relay which in turn completes another circuit which turns on the transmitter. Since they are designed to work when they come in contact with water, they have to float on the surface for a while for a satellite to pick up the signal. On the day of disappearance no satellite picked up any signals.
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