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On Tue, 3 May 1994, Keir Vaughan Taylor wrote:

> the line. Apparently an antenna broadcasts perpendicular to its length so
>  the line may have to have many mini antennas about 1mm imbedded in the line
> and perpendicular to its long axis.  Reception by the diver may not be
> possible with such a system unless they clip onto the line itself
> It might be that metal flakes embedded in the line could work ?
> 
> Any ideas ?
> 
Im not positive, but It sounds like a system that miners use to
communicate by radio. It seems that they use a certain type of cable that
is strung along the mine and when they use their radios, the radio waves
ride along the cable until it is picked up by a radio receiver. I think
the theory is called wave propogation and as I recall I read about it in a
book on mine communication.

I thought it might be nice to have a small metal line inbedded in the cave
line that could at least be used for communication on the other side of a
sump.

Happy Caving,  MarkP

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