Seafarer ELF Communications System Draft Environmental Impact Statement for Site Selection and Test Operations: Summary statement

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Halaman 5 - Deputy Secretary of Defense Secretary of the Army Secretary of the Navy Secretary of the Air Force...
Halaman 21 - ... input to each vertical radiator is limited by . The array would consist of at least balloon-supported antennas. This scheme would require considerable research to resolve risks and determine the extent to which this concept can achieve the desired performance. ROTATING SUPERCONDUCTING TRANSMITTERS A committee sponsored by the Naval Research Laboratory examined the possibility of using rotating superconducting magnets in lieu of the SEAFARER horizontal electric dipole antenna. Superconductors...
Halaman 23 - ... ACOUSTICS A number of schemes have been postulated to provide acoustical transmitters in the submarine operation areas. One such approach would place projectors and connect them cables. Technology is available for under-water acoustical communications and tests have been made over long distances. However, 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 1,000...
Halaman 34 - Committee were as follows : (l) to assess the adequacy of existing data as a basis for determining biologic and ecologic effects due to Seafarer; (2) to identify the effects, if any, that may be of major concern; (3) to identify critical inadequacies in the available data and suggest research projects designed to produce needed data. The Committee was not asked to consider such subjects as the necessity of the system, possible alternative submarine communication systems, technical feasibility, cost...
Halaman 18 - ... communication coverage is uncertain and high reliability of message delivery is difficult to obtain. Acoustic signals require 20 minutes to travel 1,000 nautical miles and, thus, the location of all acoustical projectors would require a very long delivery time to the farther submarine operating areas. PISCES The Bonneville Power Administration, an agency of the Federal government, operates an 850 mile long direct current transmission line between the Dalles, Oregon and Los Angeles. The idea for...
Halaman 23 - ... 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 of all acoustical projectors near the continental U,S, would thus preclude the possibility of meeting the short transmission times required for all the submarine ocean operating areas. Alternatively, if overseas or at-sea acoustical projectors are used,...
Halaman 18 - ... direct current transmission line between the Dalles, Oregon and Los Angeles. The idea for sharing the line for submarine communications has been explored by the Defense Communications Agency (DCA) in a project called Pisces (Pacific Intertie Strategic Communications System). While technically feasible, Pisces would not provide communications to all submarine operating areas and would provide only marginal performance in some areas which it would cover. The coverage provided probably could not...
Halaman 18 - ... Intertie Strategic Communications System). While technically feasible, Pisces would not provide communications to all submarine operating areas and would provide only marginal performance in some areas which it would cover. The coverage provided probably could not be improved over present predictions. Interference mitigation for Pisces would be more extensive and expensive than for an ELF system because of higher currents required for the former. One can only conjecture at the degree of opposition...
Halaman 34 - Sciences, was appointed during the winter of 1975-76 to study the possibility that plants, humans, and other animals might be harmed by the electric and magnetic fields associated with the operation of the transmitter of the Seafarer communication system proposed by the US Navy. Although the Committee has not yet completed its task, it has prepared...

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