3 ms·
I always wanted to do something like this with "earth mode" radio. That is, signals sent through the ground. You can put a couple conductors in the ground space
by seiferteric 2y ago
I always wanted to do something like this with "earth mode" radio. That is, signals sent through the ground. You can put a couple conductors in the ground spaced far apart and send signals into them and it can be picked up miles away apparently. Would be really slow, so probably text only, but also probably no one would notice. I also vaguely wonder if this would still be regulated by the FCC since it's not through the air...
- tessierashpool9 2y agothat sounds interesting. never heard of that. are those conductors passive? just a mesh of copper wire or sth like that?
- wbl 2y agoYou end up exciting the ionosphere this way so it's regulated. But there is a band way down there to play with if you have your ticket.
- deleted 2y ago[deleted]
- carltg_ 2y agoWhile 9kHz[3e-7/cm] (for an earth mode radio example) is lower than the plasma frequency of the ionosphere, 9MHz[3e-4/cm] (critical so that the ionosphere acts as a waveguide), would this be significantly lower, and hence have a high attenuation--a large imaginary component to the refractive index? If so, would this excite the ionosphere? Genuinely curious
- wbl 2y agoThe earth ionosphere capacitance. See longwave for details