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NTL Classification:AGR-INFRASTRUCTURE-Railroads;NTL-RAIL TRANSPORTATION-Rail Safety;NTL-RAIL TRANSPORTATION-RAIL TRANSPORTATION;NTL-SAFETY AND SECURITY-Vehicle Design;NTL-SAFETY AND SECURITY-Rail Safety;NTL-SAFETY AND SECURITY-SAFETY AND SECURITY;
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Abstract:A survey is made of various inductive systems proposed for low frequency train communication. It is found that thick dielectric jackets or coaxial and metallic shields may be required to reduce the environmental effects that lead to high attenuation. Twisted wire cables with inversely connected coupling antennas attain reduction of induced electrical noise and of radiated fields. External noise interference in various environments is discussed. Analysis is made of the coupling variation effect due to wire separation.
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