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<br />3.4 Seeding Material <br /> <br />Dry ice (C02) will be used as the direct seeding mat- <br />erial by the on-top a~rcraft. The dry ice will be dispenRed in <br />pellet form of apgroximately 20mm in size drom a flight level <br />equivalent to -20 c. Dispersal will be continuous while over <br />or in the c~lls to be treated. Fig. 2 <br /> <br />Silver iodide (AgI) will be used as the updraft <br />(cloud base) seeding material. Dispersal of AgI will be con- <br />tinuous while in areas of updraft of approximately 200 feet <br />per minute or more. In order to obtain maximum diffusion of <br />the AgI ,"hile being transported by the updraft to the super- <br />cooled cloud regions, the aircraft will travel the full range <br />of the updraft. See Fig. 2 <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. The prmject Director will utilize the PM transmitter <br />as primary and the VHF as back up. <br /> <br />A commercial telephone will be installed at the <br />Operations Center for use in alerting aircrews, for general <br />administrative use, and accessing the CLS, Bureau of Reclam- <br />ation Environmental Data Network (EDN) , located in the Denver, <br />Colorado area. A drop in this same telephone circuit will be <br />located in the Project Director's quarters. <br /> <br />All pilots will have a commercial phone installed in <br />their quarters. The project director will be provided with the <br />phone number of each pilot. In addition, each pilot will obtain <br />a paging phone system for their local area, and keep it with <br />them at all times when they are away from their commercial <br />phone. For those not located in areas of commercial paging <br />systems, every effort will be made to be integrated into the <br />local law enforcement system without interfering with their <br />system. <br /> <br />3.6 Weather Radar <br /> <br />Storm monitoring and seeding control will be with a <br />C-Band radar located at the Lakin Operations Center. The radar <br />unit has both PPI and RBI capability. Physically mounted to the <br />radar antenna system is another antenna and L-Band aircraft <br />transponder/decoder system for tracking aircraft. Aircraft <br />transponder signals can be displayed on the radar PPI scope to <br />permit plotting of seeder aircraft position relative to the <br />echo area. <br />