Institute for Telecommunication Sciences
the research laboratory of the National Telecommunications and Information Administration

Joseph E. Farrow; R. E. Skerjanec

Abstract: This paper discusses measurement of signals received over a 160-km (100-mile) line-of-sight microwave radio link operating at 8.4 GHz. Signals were recorded at both ends of the path at various times over a period of about 18 months. The effects of macro-scale meteorological conditions are discussed, particularly those which are peculiar to the central European location of the path. The data obtained from this measurement effort are presented both in terms of radio link availability and in terms of long-term propagation performance. The data were also analyzed to obtain distributions of fade duration for single receivers and for both receivers in a diversity configuration. The study supports the idea that it is possible to achieve reliable propagation at 8 GHz on a link as long as 160 km and with less than normal diversity spacing.

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