Laserfiche WebLink
<br />the HAS durinq SLW epis~des, two trips per hour corresponds to between 0.09- <br />0.28 g/m2, relative high values for orographic clouds. <br /> <br />Use of one trip per hour would cause a hiqh frequency of false alarms <br />according to analysis of SCPP data in California (David Reynolds, personal <br />communication). Yet a moderately high LWC is needed to produce even 1 trip <br />per hour if the winds are less than 3 m/s. Therefore, a two (rather than one) <br />hour moving average will be used in determining when to start and stop <br />dispensing propane. <br /> <br />COMMUNICATIONS <br /> <br /> <br />Two types of communication are important for APES. First, the base unit must <br /> <br />be able to communicate with and control the two satellite units. Second, <br /> <br /> <br />researchers must be able to communicate with the base unit. The basic <br /> <br />communication system is as shown in Figure 3. <br /> <br />In order for the base unit to communicate with the satellite units, a special <br /> <br /> <br />EPROM chip for the datalogger was used. The chip contains a special <br /> <br />instruction enabling the data loggers to make serial communication with each <br /> <br /> <br />other. <br /> <br />It is important to note the radio-to-telephone interface in the system. This <br />feature is important because it allows researchers to monitor operations, to <br />change the programming in the data logger as needed, and to disable the <br />dispenser if required. All these can be accomplished from any PC computer <br />equipped with a 100-percent-Hayes compatible model. The components for the <br />radio-to-telephone interface are shown in Table 3. <br /> <br />11 <br />