 | United States. Naval Electronic Systems Command - 1977 - 284 halaman
...transmission times required for all ocean operating areas. If overseas or at-sea acoustic projectors could be used, the transmission time and communication range could be improved. However, overseas or at-sea bases are vulnerable to political pressure and harassment. Moreover, relatively simple measures could... | |
 | United States. Congress. Senate. Committee on Armed Services - 1978 - 964 halaman
...reliability of message delivery is difficult to obtain. Acoustic signals require 20 minutes to travel 1,000 nautical miles. Location of all acoustical projectors...the transmission time and communication range could l>e improved. However, overseas or at-sea basing are vulnerable to political pressures and harassment... | |
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... been made over long distances. One of the principal problems is that communication coverage is uncertain and high reliability of message delivery is difficult to obtain. Acoustic signals require 20 minutes to travel l,000 nautical miles, Location... 