Citat:
Ursprungligen postat av
Melange5738
Var kan jag läsa det?
I den här källan säger de 120M
"Dialing down the spectrum a bit, the very low frequency (VLF: 3 kHz to 30 kHz) band starts to exhibit decent penetration of seawater, down to a depth of perhaps 20 meters. Going even further down the spectrum, signals in the extremely low frequency (ELF: 3 Hz to 30 Hz) band
are capable of penetrating 120 meters of seawater, which is deep enough for any submarine to maintain its stealth. "
Men i en annan källa sa par hundra meter och VLF 20M. Men 120 meter räcker. Jag gissar att det beror lite på typen av saltvatten mm.
https://navalpost.com/how-do-submarines-communicate-with-the-outside-world/