The Bell System Technical Journal, 1936, Vol. 15: A Journal Devoted to the Scientific and Engineering Aspects of Electrical Communication; Table of Contents and Index (Classic Reprint) - Tapa blanda

Sinopsis

Excerpt from The Bell System Technical Journal, 1936, Vol. 15: A Journal Devoted to the Scientific and Engineering Aspects of Electrical Communication; Table of Contents and Index

Observations of field variations were made on radio signals at a number of different frequencies and over several paths. It was concluded that a characteristic sunset cycle of field variations is present on frequencies between 18 kc. And 68 kc. For transmission paths longer than 700 km. For paths less than 200 km. Long, such variations are negligible. There is some evidence that the amplitude of these field variations is smaller at lower frequencies.

Analysis of the data presented indicates that long waves over long paths are transmitted predominately by sky waves. From the data it was not possible to establish any satisfactory picture of the path followed. It was established, however, that empirical methods based on observations over a particular transmission path may be employed to forecast the approximate time of occurrence of field variations.

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