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RDA  Subcomponents
RDA Special Processes

Aerographers Mate, Module 03-Environmental Satellites and Weather Radar
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pictured  in  figure  2-26.  These  components,  together with the antenna, make up the RDA. Only a single RDA exists for each system. ANTENNA.—The WSR-88D uses a 28-ft dish- shaped  antenna  to  focus  radar  energy  along  a concentrated  beam.  This  same  antenna  is  used  to receive  backscattered  energy  from  targets  and atmospheric  scatterers. PEDESTAL.—A cast aluminum structure that secures the antenna to the top of a 98-ft steel tower. The pedestal controls antenna movement with pinpoint accuracy. It rotates the antenna continuously at a maximum  speed  of  5  revolutions  per  minute  and automatically   changes   elevation   angles   in predetermined  increments. RADOME.— A spherical cover that protects the antenna.   Made   of   rigid   fiberglass,   the   radome measures about 39 ft in diameter and resembles a giant golf ball. Its design inhibits ice and snow buildup. Figure  2-27  shows  the  antenna,  pedestal,  and  radome. Figure 2-26.—WSR-88D Radar Data Acquisition (RDA). 2-24







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