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<br />Page 10 <br /> <br />A locally leased light-twin engine aircraft will be used during <br />some experiments to release SF6 gas at a known rate. It will <br />carry no other special equipment. Its position will be manually <br />recorded while flying DME (distance measuring equipment) arcs off <br />the Winslow VORTAC. Aircraft-to-aircraft communication will be <br />with standard UHF radios. <br /> <br />2. Microwave Radiometer <br /> <br />The Bureau of Reclamation microwave radiometer is an important <br />and relatively new instrumentation system which can detect the <br />presence and integrated amount of both water vapor and liquid <br />water along its field of view. It is a passive system monitoring <br />incoming natural radiation at 20.6 GHz (1.45cm) and 31.6 GHz <br />(.95cm). It provides no ranging information so interpretation of <br />location of the vapor and liquid must be inferred from other data <br />sources. The system is controlled by an LSI-11 computer, and the <br />data are recorded on floppy discs and transferred to the Bureau's <br />P-E (Perkin Elmer) mini-computer via magnetic tape for final <br />analysis. <br /> <br />An extremely hydrophobic substancl~ (vellox) will be applil~d to the <br />system's reflector to keep it clear of water and wet snow. A fan <br />which blows air over the reflectolr prevents dry snow accumulation. <br />