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Cave-Texting Device Involves Combination of Computer and Ham Radio:

from popsci.com on February 3, 2010
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Cave-Texting Device Involves Combination of Computer and Ham Radio:

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Cave-Texting Device Involves Combination of Computer and Ham  
by WI7B on February 3, 2010 Mail this to a friend!
Cool!

73,

---* Ken
 
Cave-Texting Device Involves Combination of Computer and Ham  
by K3HMX on February 7, 2010 Mail this to a friend!
A similar idea to the Rock Phone which uses magneto-inductive communications at VLF frequencies. Some info can be found here:

http://www.ultra-uems.com/rockphone.html

Yeah, the loops are a little large and the data rate is low, but to MI granite looks about the same as air. You can go pretty small for a receive-only antenna, but to transmit any distance you really need a loop (or a massively heavy ferrite bar arrangement).

Pretty amazing for a high-school project, though!
 
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