February 1990 | NTIA Technical Report TR-90-256

Design and Performance of a Long, Over–Water Microwave Radio Link

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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Disclaimer: Certain commercial equipment, components, and software may be identified in this report to specify adequately the technical aspects of the reported results. In no case does such identification imply recommendation or endorsement by the National Telecommunications and Information Administration, nor does it imply that the equipment or software identified is necessarily the best available for the particular application or uses.

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