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

Joseph E. Farrow

Abstract: This paper discusses the design and the measured performance of a 76.8-kIn (47.7-mi) over–water 2.3 GHz microwave radio link. Since one of the terminals was located on an ocean tower, the maximum antenna height at that location was restricted to 49 m (160 ft). A 367-m (1200-ft) tower was used at the shore end to provide ray path clearance for normal and extreme refractivity gradients. The tower at the shore end supported antennas at 361 m (1180 ft), 345 m (1128 ft), 229 m (750 ft), and 49 m (160 ft) to provide quadruple diversity protection. Received signal level measurements were made over the link for several months including some of the summer period. Propagation performance of the link during this period was satisfactory.

Keywords: 2 GHz propagation; long; over-water path; quadruple diversity performance analysis; refractive gradient analysis

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