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New Strategy - Wargames at Discount Prices
100+ Computer and Board games all with free shipping.
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Subject:
RE:Communication for subs
elcid
10/17/2004 7:14:54 PM
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French Strategy (rewritten in English) is a bit too cryptic but correct. The problem is he does not make it clear what the limits are.
Communication with submarines is hard. Communication FROM submarines is harder. The problem is radio waves don't like the sea very much.
If a submarine is surfaced, or surfaces an antenna, it can use satellite communications, or classical HF, VHF or UHF communications, two way. The problem with this it is dangerous to do that - getting near the surface or actually surfacing is to risk detection in many situations. Also, sub antennas are not as efficient as big ship antennas are, due to space limitations, satellite antennas being somewhat an exception to this problem.
If a submarine is not on the surface and wants to listen only, it can trail a long wire, and get ELF or ULF signals underwater. Not an unlimited way underwater, however. These messages are very short - low frequency reduces the signal speed dramatically. This often means the signals say "surface an antenna to get my real transmission."
At close range a sub can use a sonar telephone to talk to another sub or ship, but everyone in the area hears EVERYTHING.
Subs often are out of communication for long periods. Subs also can send bouys up to send emergency signals such as "location of sunk submarine." |
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