8B, PC 09-020 for 2 Pine Tree Drive

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CONSULTING COMMUNICATIONS ENGINEERS - EMC TEST LABDRATORIES 5044 Ham line Avenue North, Sherailew, MM 55126 651-704-7445 * Fax 651-784-7541 Engineering Statement In reviewing the submitted data it was determined that additional information for nearby Clearwire Communications telecommunications sites was needed in order to make a signal coverage study determination. The requested information was provided and the data was 'analyzed. This analysis shows how Clearwire Communications has designed its communications facilities in the Arden Hills area with several surrounding sites providing area wide coverage. Figure 1 shows the results of the coverage study analysis using the data for this proposed site in addition to the data supplied by Clearx.,vire Communications for the nearby system sites. The analysis was then repeated with the proposed site removed from the analysis in order to determine if there is any gap in coverage in the Clearwire Communications system in the proposed coverage area. Figure 2 shows that a gap in coverage does exist and is identified. An area of concern expressed by the city was to determine if the two (2) existing water towers could be used to provide the required coverage area for the Clearwire communications system. In reviewing the locations of the water towers and the communications facilities locations, the water tower on Cummings Park Drive (WTI) is too far to the north, from the proposed new Clearwire site and cannot provide the required coverage area to eliminate the signal coverage gap. It is also predicted to cause harmful interference to an existing site used by Clearwire. The analysis was repeated using the Red Fox Road water tower (WT2) as the location of the communications system. Figure 3 shows there would be a significant gap in coverage for the communications system, It is also predicted to cause harmful interference to an existing site used by Clearwire. In reviewing the Clearwire communications system it is noted that they used a microwave system tV# provide data and other required information between the various system' sites. The particular problem with these microwave systems is that they require direct line -of -sight and path clearances between them, This further complicates the location of system sites since they also have to consider this problem in locating the various communications sites in their system. In summary, the proposed communications site at 2 Pine Tree Drive eliminates a gap in coverage and the use of the existing city water towers would not eliminate the gap in coverage for the Clearwire communications system in the Arden Hills area. Garrett G. Lysiak, P.E.