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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />precipitation in anyone selected direction as a function of r~lllge. <br />The scales for the RID display are the same as the PPI, for range, <br />but has vertical scale in thousands of feet with maximum height of <br />70, 000 feet. The Rill system is used to monitor the vertical <br />characteristics of the rain areas, primarily echo tops and heights <br />of maximum reflectivity. <br />This radar system is also equipped with an aircraft <br />beacon tracking system (IFF) which operates independently of the <br />weather radar. The IFF is used to locate and identify individual <br />aircraft. The location of each airplane is displayed on the PPI <br />screen and thus can be correlated directly to the weather echoes <br />being displayed simultaneously., <br />The VID system provides a digital readout of inte- <br />grated radar reflectivity as measured at a selectable range. The <br />operator can scan the VID gate in either PPI or RID modes in <br />order to obtain quantitative reflectivities of selected echo regions. <br />An auxi liary PPI scope provides a plan view of <br />cloud systems that is photographed in time-lapse sequences on <br />8-mm film. The film can then be used in post season analysi.s. <br />Figure 4a shows the radar van at the Georgetown Municipal airport. <br />Figure 4b shows the radar console containing the PPI and RHI <br />scopes. On top of the console is the VID unit and the calibration <br />equipment. <br /> <br />2. 5 Communication <br />A 360 channel VHF transceiver was used for commu- <br />nications between the seeding aircraft and the radar site. The <br />pilot was required to monitor two VHF frequencies at once; the <br />radar site and the appropriate ATe frequency. Thus a tunable <br /> <br />13 <br /> <br />'. <br />