Member Since: November 23, 2011

Country: United States

  • lawrah, the only frequencies that don’t get clobbered underwater are at the opposite ends of the electromagnetic spectrum: VLF radio (in the tens of KHz), or blue-green light – preferably laser light. These freqs. are how the Navy communicates with subs underwater. You can now find relatively cheap blue laser pointers that might do the trick for you.

    You might also experiment with simple piezo transducers (cheap!) to implement an acoustic link. Just be sure to put them in water-tight housings ;-)…

    Good luck! (And, OF COURSE everyone on this forum should get their Ham ticket – but that’s another story.)

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