4 ms·
Submarines under the surface can receive VLF signals. The signals are broadcast from either land stations[0], or aircraft[1] trailing a 5-mile-long wire antenna
by jjwiseman 4y ago
Submarines under the surface can receive VLF signals. The signals are broadcast from either land stations[0], or aircraft[1] trailing a 5-mile-long wire antenna (the aircraft fly in a circle so the antenna is mostly vertical). Subs can extend a long antenna below the surface in order to receive the signals[2].
0. https://en.wikipedia.org/wiki/Lualualei_VLF_transmitter https://en.wikipedia.org/wiki/Lualualei_VLF_transmitter
1. https://twitter.com/lemonodor/status/1312134472280633345 https://twitter.com/lemonodor/status/1312134472280633345
2. https://twitter.com/thenewarea51/status/1347668162406477824 https://twitter.com/thenewarea51/status/1347668162406477824