Pendergrass RF Test

NOTICE submitted by Viasat, Inc.

RF Shielding Test Report

2018-05-29

This document pretains to SES-MOD-20170718-00770 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017071800770_1406325


PENDERGRASS TEST REPORT NARRATIVE: Exhibit A of Viasat’s FCC site license for the Pendergrass, Georgia ground station (FCC call sign E160161) is the “Frequency Coordination Study for Proposed EESS Uplink near Pendergrass, Georgia July 22, 2016” created by Hammett & Edison, Inc., Consulting Engineers. This report contains a recommendation to build a RF shield to provide at least 37 dB of attenuation between Viasat’s 5.4 meter antenna and a broadcast tower used for electronic news gathering located in Flowery Branch, Georgia. In April of 2018, Viasat completed construction of a RF shielding solid wall and conducted attenuation measurements. The results of the measurements show a measured value of 40 dB of attenuation, providing ample margin over the 37 dB objective in the aforementioned study by Hammett & Edison. RF SHIELDING WALL A metallic RF shielding wall was constructed between Viasat’s 5.4 meter antenna and Flowery Branch broadcast tower as shown in Figure 1 and Figure 2. The wall has dimensions of 9.1 meters high by 15.2 meters wide and was built in accordance to local construction regulations. Figure 1 RF Shielding Wall Construction 1|Page

Figure 2 RF Shielding Wall Location Between Viasat Antenna & TV Tower RF SHIELDING TEST Testing was conducted on 19 April 2018 to verify that the RF shielding wall meets the value of 37 dB recommended in Hammett & Edison’s frequency coordination study. Viasat’s 5.4 meter antenna was pointed in the direction of the TV tower and measurements were made on both sides of the wall using a horn placed at the height of the maximum signal strength at the center of Viasat’s antenna as shown in Figure 3. Figure 4 is a plot of the measured signal strength showing that a value of 40.7 dB of attenuation was measured. The test procedure and test data sheet are contained in a separate document. 2|Page

Figure 3 RF Attenuation Measurements Figure 4 Measured RF Signal Attenuation 3|Page


Document Created: 2018-05-29 12:47:33
Document Modified: 2018-05-29 12:47:33
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