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Some Measurements of Attenuation by Rainfall at 18.5 GHz

01 July 1969

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One of the problems encountered in t h e utilization of t h e millimeterwave b a n d s for r a d i o - r e l a y systems is a t t e n u a t i o n resulting from precipitation. T h e r e is a continued effort to overcome t h e f u n d a m e n t a l i n a d e q u a c y concerning the knowledge of the p r o p a g a t i o n environment. Recently a p a p e r by M e d h u r s t , which collects m o s t of the published m e a s u r e m e n t s 011 microwave a t t e n u a t i o n by rain, has shown t h a t there is wide disagreement between observed and calculated values. 1 * Part of this material was presented to the Union de Radio Scientifique Internationale Commission 2 in Washington, D. C., (April 1968). 1767 1768 T H E BELL SYSTEM TECHNICAL JOURNAL, JULY-AUGUST 1969 This p a p e r discusses measurements at 18.5 G H z on a 6.4 kilometer p a t h t h a t passes above four c a p a c i t o r - t y p e rain gauges. 2 T h e gauges are p a r t of a network centered at Bell Laboratories, C r a w f o r d Hill, Holmdel, N e w Jersey.