Abstract
AN original conception of the Federal Telephone and Radio Corporation, now being adopted by ship architects in the United States, is the marine high-frequency unit-an entirely self-contained, complete, high-frequency ship installation, including transmitter, receiver and power equipment in a single housing with projecting shelf for operating purposes. In addition to providing a simple, flexible and effective way of supplying long-distance communication facilities over a continuously variable frequency range of 2-24 m.c. to any ship, it possesses advantages as regards installation, training, operating and servicing comparable with the marine radio unit. . The development of these two units enables ship designers and marine architects to determine well in advance the exact space requirements needed for a complete modern radio room installation for both medium and high frequency. Waste of valuable capacity in the ships' structures can thus be avoided, and, in fact, the new units are already influencing the design of ships' radio rooms. An article by E. J. Girard (Elec. Comm., 21, No. 2 ; 1943) describes the new high-frequency unit, its circuit features, power supplies and installation. The new equipment employs the unit construction principle for shipboard radio installations. High-frequency radio transmitting and receiving equipment supplements standard frequency installations to provide, through choice of proper frequencies, means of direct communication with points far beyond the range of standard-frequency working. Since long-distance communication on high frequencies is accomplished with relatively low power, economy of operation is maintained even though the range is vastly extended. With elimination of ship-to-ship relaying of messages, accuracy and reliability are improved and communication with home ports is accelerated.
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The High-Frequency Marine Radio Unit. Nature 152, 657–658 (1943). https://doi.org/10.1038/152657c0
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DOI: https://doi.org/10.1038/152657c0