| VLF - komunikacja z łodziami podwodnymi. |
| Angielska wikipedia twierdzi tak: "Due to the low frequency a VLF broadcast antenna needs to be quite big. In fact, broadcasting sites are usually a few square kilometers (or miles). This prevents such antennas being installed on submarines. Submarines only carry a VLF reception aerial, and do not respond on such low frequencies. So a ground-to-submarine VLF broadcast is always a one way broadcast, originating on the ground and received aboard the boat. If two-way communication is needed, the boat must ascend to periscope depth (just below the surface) and raise a telescopic mast antenna to communicate on higher frequencies (such as HF, UHF or VHF)." (http://en.wikipedia.org/wiki/Communication_with_submarines) Trzeba by było to zweryfikować w jaki ródłach. |