Radio attenuation at 11 kmc and some implications affecting relay system engineering

Radio waves at 11 kmc are attenuated by rain. In order to derive rules for engineering radio relay systems at 11 kmc, a one-year experiment was conducted in a region of frequent heavy rainfall. The attenuation of paths 27 and 12 miles long was measured, together with rainfall at two-mile intervals along the paths. The instrumentation and the test results are described, and some implications related to systems engineering are pointed out.