how do military submarines communicate with land and how long does it take.

Question

how do military submarines communicate with land and how long does it take.

In: 1

Answer 1

The US Navy maintains facilities that broadcast very slow speed encrypted data to submarines. In order to do so effectively, and for the signals to penetrate the water they have to use VLF frequencies between 3 and 30 KHz.they have to use such low frequencies because they need to penetrate salt water. Slow speed encrypted data communications are sent via very high powered transmitters which have to use enormous antenna systems due to the very long wavelengths.