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| To: | rsgb_lf_group <[email protected]> |
|---|---|
| Subject: | LF: VLF "Through the Earth" Comms |
| From: | Warren Ziegler <[email protected]> |
| Date: | Wed, 9 Jan 2013 22:46:59 -0500 |
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A friend of mine who does caving pointed me to a company that makes VLF equipment for use in mines, railway tunnels etc. It operates in the 400Hz-8kHz range.
If interested take a look at their web page:
73 Warren K2ORS WD2XGJ WD2XSH/23 WE2XEB/2 WE2XGR/1 |
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