Attachment Narrative

This document pretains to SES-STA-20110121-00048 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2011012100048_861943

ViaSat, Inc. Request for Special Temporary Authority Attachment A Description of Request for Special Temporary Authority ViaSat, Inc. (“ViaSat”) hereby requests special temporary authority (“STA”), to operate a 7.3 m meter Model VA-73-KA transmit/receive antenna operating in the Ka-band in Rapid City, South Dakota for purposes of testing the uplink power control system in advance of the launch of VIASAT-1. ViaSat requests authority commencing on February 7, 2011 for a period of 30 days. ViaSat intends to use this antenna as both a traffic gateway and as a TT&C communications point for its VIASAT-1 satellite, which is scheduled for launch during the summer of 2011. ViaSat has completed construction of this gateway antenna and performed antenna pattern tests pursuant to STA SES-STA-20100915-01165. Those tests indicated that the antenna meets all the requirements of Section 25.209 and that during normal operation it will comply with the off-axis EIRP performance levels set forth in Section 25.130 of the Commission’s rules. The public interest will be served by the grant of this STA because it will allow ViaSat to conclude testing of the gateway’s uplink power control system in advance of the satellite launch and thereby ensure the integrity of the ground network that will support the launch of VIASAT-1 this year. In order to perform the uplink power control testing, carriers will be transmitted from the antenna while it is tracking the WildBlue-1 satellite. The resulting off-axis EIRP density levels produced will comply with the values in Section 25.138. A radiation hazard analysis performed pursuant to the methodology set forth in OET Bulletin 65, is on file with the Commission for this Earth station as an attachment to the previous STA SES-STA-20100915-01165. The operating levels for this testing will be within the envelope defined in that analysis. The analysis indicated that harmful levels will not be present in areas occupied by the general population and that the antenna system does not present a risk to trained personnel in the immediate vicinity of the antenna. ViaSat respectfully requests STA to operate this antenna pursuant to the following parameters: Location of Earth Station Site: Latitude: 44°11’17.11” N, Longitude: 103°20’11.70” W (NAD-83) Points of Communication: WildBlue 1 at 111.1 (Canadian)

Frequency Polarization Emission T/R mode Max Max EIRP Modulation/ Services (GHz) EIRP/ Density Carrier (/40 kHz) 29.5-30.0 RHCP 52M1G7D Tx 86 54.85 Mary-PSK / Data 29.5-30.0 LHCP 52M1G7D Tx 86 54.85 Mary-PSK / Data Max Gains: 65.39 dBi @ 29.1 GHz 65.52 dBi @ 30.0 GHz Maximum total input power at antenna flange: 110.7 Watts Maximum aggregate output EIRP for all carriers: 86 dBW Frequency Coordination: Satellite Arc Elevation Azimuth Max EIRP Density toward Horizon (dBW/40 kHz) Frequency East West East West East West Limit Limit Limit Limit Limit Limit 29.5-30.0 GHz 85W 111.1W 35.87 38.49 154.57 191.07 -17.15 2


Document Created: 2011-01-21 13:55:06
Document Modified: 2011-01-21 13:55:06
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