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Extra resources for [Article] An Attempt to Detect the Mutual Influence of Neighboring Lines in Electric Furnace Spectra Showing Anomalous Dispersion

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Radio Wave Propagation,” in The Electronics Handbook, Jerry C. ), CRC Press, Boca Raton, FL, pp. 131–1332, 1996. , and K. ), Standard Handbook of Video and Television Engineering, McGraw-Hill, New York, NY, 2000. 3 © 2001 by CRC PRESS LLC Whitaker, Jerry C. “Frequency Assignment and Allocations” The Resource Handbook of Electronics. Ed. Jerry C. S . S. Code, beginning with Section 151. S. is a party are as follows: • The International Telecommunication Convention, signed at Nairobi on Novem- ber 6, 1982.

In reality, there are two major modes of propagation: the skywave and the groundwave. The skywave refers to propagation via the ionosphere, which consists of several layers of ionized particles in the Earth’s atmosphere from approximately 50 to several hundred kilometers in altitude. Some frequencies will be reflected by the ionosphere resulting in potentially long-distance propagation. Groundwave propagation consists of two components, the space wave and the surface wave. The space wave also has two components known as the direct path and the reflected path.

2. 4. Low-End Spectrum Frequencies (1 to 1000 Hz) Electric power is transmitted by wire but not by radiation at 50 and 60 Hz, and in some limited areas, at 25 Hz. Aircraft use 400-Hz power in order to reduce the weight of iron in generators and transformers. The restricted bandwidth that would be available for communication channels is generally inadequate for voice or data transmission, although some use has been made of communication over power distribution circuits using modulated carrier frequencies.

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