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<br />.. <br /> <br />3.Af Seeding Material <br /> <br />Both the pyrotechnic devices and the acetone <br />burners will -.J:tilize a silver iodide - arroniurn iodate o:rnplex. 'fue <br />silver iodide materials have been checked for ice nuclei yield in <br />the Colorado State University cloud simulation chamber. Nuclei <br />yield rates cbtained fran these tests will be used in rraking seeding <br />concentratior: calculations. <br /> <br />3.5 Airborne Sensors <br /> <br />'fue tv.u Navajo aircraft will be equipped with <br />sensors and a data re=rding system to record relative humidity, <br />temperature, altitude,airspeed, position and tinE. One of the air- <br />craft will al.so have the capability to rreasure and record liquid <br />water =ntent and ice crystal counts. <br /> <br />3.6 O:rnnunications <br /> <br />3.6.1 <br /> <br />Air to Ground <br /> <br />Air to ground ccrnnuncations will be <br />accc:xt;>lished t..'u:ough the use of a VHF net operating on 155.100 MHz. <br />'fue base station will be at the Operations Center with each aircraft <br />having a dedicated transceiver. <br /> <br />3.6.2 <br /> <br />Ground to Gro\IDd <br /> <br />A camercial telephone will be installed <br />at the Operations Center for use in alerting aircrews, Garden City <br />NWS radar repeater link, BUREC envirolllTEntal data netv.urk ccmputer <br />terminal, and general administrative use. A drop on this same <br />telephone circuit will be located in the Project Director's quarters. <br /> <br />3. 7 Weather Radar <br /> <br />Storm rronitoring and seeding control will be with <br />a C-Band radar located at the Lakin Airport Project O[::erations Center. <br />'fue radar \IDit has PPI and RHI scopes with digital re=rding and <br />replay capability. '!he unit has an Irband aircraft transpor:der <br />interrogator for use in tracking seeder aircraft. Aircraft beacon <br />signals can be displayed on the radar PPI scope to pennit plotting <br />of seeder aircraft position relative to the echo area. <br /> <br />Broad scale radar coverage will be obtained fran <br />the National weather Service \VSR-57 radar at Garden City or Lim:>n. <br />Readout fran these NWS radar will be at selected intervals using a <br />telefacsimile repeater unit installed in the Operations Center. <br /> <br />When paper ropy is made of echo displays, seeding <br />locations will be transposed fran the radar scope to the paper ropy. <br />