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<br />'. <br /> <br />3.4 Seeding Material <br /> <br />Both the pyrotechnic devices and the acetone <br />burners will utilize a silver iodide - ammonium iodate complexo <br />The silver iodide materials have been checked for ice nuclei <br />yield in the Colorado State University cloud simulation chambero <br />Nuclei yield rates obtained from these tests will be used in <br />making seeding concentration calculations. <br /> <br />3.5 Communications <br /> <br />Ground to air communications will be accomplished <br />using FM frequency 155.10 MHz. A base station will be at the <br />Operations Center, with each aircraft having a dedicated trans- <br />ceiver. A VHF transceiver will also be located at the Operations <br />Center. Aircraft will transmit on VHF multicom frequency when <br />above the altitude authorized for transmitting on the FM fre- <br />quency. <br /> <br />A commercial telephone will be installed at the <br />Operations Center for use in alerting aircrews, accessing the <br />Garden City NWS radar repeater link, the U.S. Water and Power <br />Resources Service's Environmental Data Network (EDN), and for <br />general administrative use. A drop on this same telephone <br />circuit will be located in the Project Director's quarterso <br /> <br />3.6 Weather Radar <br /> <br />Storm monitoring and seeding control will be with <br />a C-Band radar located at the Lakin Operations Center. The <br />radar unit has PPI and RHI scopes with digital recording and <br />reply capabilityo The unit has a L-band aircraft transponder <br />interrogator for use in tracking seeder aircraft. Aircraft <br />beacon signals can be displayed on the radar PPI scope to per- <br />mit plotting of seeder aircraft position relative to the echo <br />area. <br /> <br />Broad scale radar coverage will be obtained from <br />the National Weather Service WSR-57 radar at Garden City or <br />Limon. Readout from these NWS radar will be at selected inter- <br />vals using a telefacsimile repeater unit installed in the <br />Operations Centero <br />