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https://annihilation.social/media/0029e3a6-82b7-414d-a8b9-3216aafc9a23/800px-Ground_dipole_ELF_antenna.svg.png?name=800px-Ground_dipole_ELF_antenna.svg.png

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  1. Embed this notice
    MathIIIX (3t@annihilation.social)'s status on Friday, 04-Aug-2023 20:55:49 JST MathIIIX MathIIIX
    in reply to
    @safiuddinkhan
    fascinating stuff radio communications. Americans used to communicate with subs via ELF (extremely low frequency) antenna had 23 km
    https://en.wikipedia.org/wiki/Extremely_low_frequency#Submarine_communications
    In conversation Friday, 04-Aug-2023 20:55:49 JST from annihilation.social permalink
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GNU social JP is a social network, courtesy of GNU social JP管理人. It runs on GNU social, version 2.0.2-dev, available under the GNU Affero General Public License.

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