Tuesday, September 8, 2026

Bonus Tab-Clearing Post: Cave Rescuers Use Ground-Penetrating Digital Radios


Waaaay down in the 2200m band around 137kHz.  This article at Dan Romanchik's blog initially alerted me to it, but here are all the other links:
Interesting stuff.  If I had any spare time and collaborators, I'd look into how this band propagates across large bodies of salt water.  Vertically polarized, of course.  If I get around to building something, I'll call a few friends over by Biloxi, or maybe contact some Tampa area hams.  Yeah, real soon now.

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