Attachment 20161123132620.pdf

20161123132620.pdf

REQUEST FOR SUPPLEMENTAL INFORMATION submitted by FCC Staff Engineer

13 GHz Report

2016-11-23

This document pretains to SES-STA-20161109-00879 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2016110900879_1159512

Intelsat Licences LLC Napa, California Vertex 8.1 Meter Earth Station 1. Background This Exhibit is presented to demonstrate the extent to which the Intelsat License LLC ("Intelsat") satellite earth station in Napa, California is in compliance with the Federal Communications Commision ("FCC") Report and Order 96—377. The potential inteference from the earth station to U.S. Navy shipboard radiolocation operations ("RADAR") and the National Aeronautics and Space Administration ("NASA") space research activities in the 13.75—14.0 GHz band is addressed in this exhibit. The parameters for the earth station are: Coordinates (NAD83): 38° 14‘ 43.0" N, 122° 16‘ 51.0" W Satellite Location for Earth Station: 1S—8 at 195°W to SO°W Frequency Band: 13.75—14.00 GHz Polarizations: Linear & Circular Emissions: 900KF2D Modulation: FM/PCM/BPSK Maximum Aggregate Uplink EIRP: 75dBW for all Carriers Transmit Antenna Characteristics Antenna Size: 8.1 Meters in Diameter Anenna Type/Model: Vertex Gain: e 59.9 dBi RF Power into Antenna Flange: 15.1 dBW or —8.4 dBW/4kHz Minimum Elevation Angle: 5.57° @ 257.89° Azimuth 5.42° @ 101.97° Azimuth Side Lobe Antenna Gain FCC Reference Pattern Because the above uplink spectrum is shared with the Federal Government, coordination in this band requires resolution data pertaining to potential interference between the earth stations and both U.S. Navy Department and NASA systems. Potential intefference from the earth station could impact the U.S. Navy and/or NASA systems in two areas. These areas are noted in GCC Report and Order 96—377 dated September 1996, and consist of (1) Radiolocation and Radio Navigation, (2) Data Relay Satellites. Summary of Coordination Issues: a.) Potential Impact to Government Radiolocation (Shipboard Radar) b.) Potential Impact to NASA Tracking and Data Relay Satellite Systems ("TODRSS")

2. Potential Impact to Government Radiolocation (Shipboard Radar) Radiolocation operations ("RADAR") may occur anywhere in the 13.4—14.0 GHz frequency band aboard ocean—going U.S. Navy ships. FCC order 96—377 allocates the top 250MHz of this 600 MHz band to the Fixed Satellite Service ("FSS") on a co—primary basis with the radiolocation operations and provides for an interference protection level of —167 dBW/m‘/4kHz. The closest distance to the shoreline from Napa, California earth station is approximately 60 km southwest toward the Pacific Ocean. The calculation of the power spectral density at this distance is given by: 1. Clear Sky EIRP: 75 dBW 2. Carrier Bandwidth: 900 kHz 3. PD at antenna input: ~8.4 dBW/4kHz 4. Transmit Antenna Gain: 59.9 dBi 5. Antenna Gain to Horizon: 10.4 dBi 6. Antenna Elevation Angles: 5.6° @ 257.9° azimuth 5.4° @ 102° azimuth The earth station will radiate interference toward the acean according to its off—axis side—lobe performance. A conservative analysis, using FCC standard reference pattern, results in an off—axis antenna gain of 10.4 towards the Pacific Ocean. The signal density at the shoreline, through free space is: PFD = Antenna Feed Power density (dBW/4kHz) + Antenna Off—Axis Gain (dBi) — Spread Loss (dBW/mz) =—8.4dBW/4kHz +10.4dBi — 10*log[4*PI*(6Okm)*2) = ~104.6 dBW/m/4kHz — Additional Path Losses (62.8 dB) Our calculation indicate additional path loss of approximately 62.82 dB including absorbtion loss and earth diffraction loss for the actual path profiles from the earth station to the nearest shoreline. The calculated PFD, including additional path losses to the closest shoreline, is —167.4dbW/ m*2/4 kHz. This is 0.4dB below the —167.0 dBW/ m*2/4 kHz interference criteria of the R&O 96—377. Therefore, there should be no interference to the U.S. Navy RADAR from the Napa, California earth station due to the distance and the terrain blockage between the site and the shore. 3. Potential Impact to NASA‘s Tracking and Data Relay Satellite System The geographic location of the Intelsat earth station in Napa, California is outside the 60 km radius coordination contour surrounding NASA‘s White Sands, New Mexico ground station complex. Therefore the TDRSS space—to—earth link will not be impacted by the Intelsat earth station in Napa, California.

The TDRSS space—to—space link in the 13.772 to 13.778 GHz band is assumed to be protected if an earth station produces and EIRP of less than 71 dBW/6MHz in this band. The 8.1 meter earth station antenna will not transmit in this band. Therefore, there will be no potential interference to the TDRSS space—to—space link. 4. Coordination Result Summary and Conclusions The results of the analysis and calculation performed in this exhibit indicate that compatible operation between the earth station at the Napa, California facility and U.S. Navy and NASA TDRSS space—to—earth and space—to—space links are possible. No interference to U.S. Navy RADAR or NASA TDRSS operations from the Napa, California site earth station should occur.


Document Created: 2016-11-23 13:26:33
Document Modified: 2016-11-23 13:26:33
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