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Old 6th Apr 2014, 04:19
  #9273 (permalink)  
p.j.m
 
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Originally Posted by Mesoman
I believe these devices simply emit an unmodulated, short burst of 37.5khz energy.
Its a continuous tone, but it's getting weaker every day as the batteries run down, and if a ship is underway it could well just pick the signal up for a few minutes as it passed by the edge of reception.
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