[SFDX] Cave Radio – Talking Through Solid Rock- Make Magazine

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  Cave Radio – Talking Through Solid Rock

Electronics <https://makezine.com/category/electronics/> Technology 
<https://makezine.com/category/technology/>
Cave Radio – Talking Through Solid Rock

Mike Bedford, G4AEE


      By Mike Bedford, G4AEE <https://makezine.com/author/mike-bedford>

August 17th, 2026 
<https://makezine.com/article/electronics/cave-radio-talking-through-solid-rock/>

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Cover of Make Volume 96. Headline is "Change it Up!" 3D printers 
Snapmaker U1 and Prusa XL are on the cover.This article appeared in 
Make: Vol. 96. Subscribe to Make: <https://make.co/join> for the latest 
articles.

Radio signals don’t pass through rock to reach caves, mines, and 
tunnels, right? You’d be excused for thinking so, because you’ve surely 
lost your favorite radio station, or your phone conversation, when 
you’ve driven into a tunnel. But things aren’t that simple. By using 
special techniques, radio communication between the surface and 
underground really is possible, and you can try it for yourself.

Commercial equipment is available for communicating with miners, but 
these systems are massively expensive and not really portable. But cave 
explorers also need to talk to their colleagues on the surface — we’ll 
see why later — and cavers’ needs have been met, in the main, by the 
maker community. What’s more, there’s still plenty of scope here for 
devising new equipment and new techniques. So if you want to take up a 
new and unusual challenge, or if you just want to learn how cave radio 
is even possible, join us on this voyage of discovery into subterranean 
communication.


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https://makezine.com/article/electronics/cave-radio-talking-through-solid-rock/* 

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