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Ship Radio-Telephone SystemsExperimental work, directed toward the establishment of ship-to-shore two-way telephone communication, by means of which a person on a ship at sea could be connected by radio with the land telephone systems of the United States, was started in 1919. Although these studies indicated the technical feasibility of the plan, it was dropped in 1922. Experiments were resumed some years later, and beginning in 1929 two-way telephone service was established with several of the large transatlantic liners.32 Two general types of systems now exist: those for providing radiotelephone connections to transoceanic ships33 and those for providing coastal and harbor service.34 The systems for service with transoceanic ships are similar to the short-wave systems described previously and employ amplitude-modulation equipment. The coastal and harbor equipment also is amplitude modulated, but it is less elaborate than the other systems.
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Last Update: 2011-05-28