Attachment Technical Study

This document pretains to SES-MOD-20150626-00427 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2015062600427_1093779

Exhibit For Hauppauge, Suffolk, New York Earth Station Call Sign: E990402 Compliance with FCC Report & Order (FCC96-377) for the 13.75 - 14.0 GHz Band Analysis and Calculations 1. Background This Exhibit is presented to demonstrate the extent to which the Globecomm License Sub LLC satellite earth station in Hauppauge, Suffolk, New York is in compliance with FCC REPORT & ORDER 96-377. This analysis considers an existing 9.3 meter antenna. The potential interference from the earth station to US Navy shipboard radiolocation operations (RADAR) and the NASA space research activities in the 13.75 - 14.0 GHz Band is addressed in this exhibit. The parameters for the earth station are: Table 1. Earth Station Characteristics • Coordinates (NAD83): 40° 48’ 54.1” N, 73° 14’ 17.8” W • Satellite Location for Earth Station: From 2.0° W to 130.0° W Atlantic Bird 2 (8.0° W) • Frequency Band: 13.75-14.0 GHz for uplink • Polarizations: Linear and Circular • Emissions: 600KG7W 30M0G7W 36M0G7W • Modulation: Digital • Maximum Aggregate Uplink EIRP: 68.5 dBW for the 600 kHz Carriers 75.9 dBW for the 30 MHz Carriers 84.8 dBW for the 36 MHz Carriers • Transmit Antenna Characteristics Antenna Size: 9.3 meters in Diameter Antenna Type/Model: Vertex Corporation Gain: 60.8 dBi • RF power into Antenna Flange: 600 kHz 7.7 dBW or -14.1 dBW/4 kHz (Maximum)

30 MHz 15.1 dBW or 0.3 dBW/MHz or -23.7 dBW/4 kHz (Maximum) 36 MHz (From 13.780 to 14.000 GHz) 24.0 dBW or 8.5 dBW/MHz or -15.5 dBW/4 kHz (Maximum) • Minimum Elevation Angles: Hauppauge, NY 9.9° @ 106.8° Az. (Atlantic Bird 2) at 8.0° W • Side Lobe Antenna Gain: 32 - 25*log(θ) 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 station and both Navy Department and NASA systems. Potential interference from the earth station could impact with the Navy and/or NASA systems in two areas. These areas are noted in FCC Report and Order 96-377 dated September 1996, and consist of (1) Radiolocation and radio navigation, (2) Data Relay Satellites. Summary of Coordination Issues: 1) Potential Impact to Government Radiolocation (Shipboard Radar) 2) Potential Impact to NASA Data Relay Satellite Systems (TDRSS) 2. Potential Impact to Government Radiolocation (Shipboard Radar) Radiolocation operations (RADAR) may occur anywhere in the 13.4 - 14 GHz frequency band aboard ocean going United States Navy ships. The Federal Communication Commission (FCC) order 96-377 allocates the top 250 MHz 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/m2/4 kHz. The closest distance to the shoreline from the Hauppauge earth station is approximately 27.0 km Southeast toward the Atlantic Ocean. The calculation of the power spectral density at this distance is given by: 600 kHz 30 MHz 36 MHz 1. Clear Sky EIRP: 68.5 dBW 75.9 dBW 84.8 dBW 2. Carrier Bandwidth: 600 kHz 30 MHz 36 MHz 3. PD at antenna input: -14.1 -23.7 -15.5 dBW/4 kHz 4. Transmit Antenna Gain: 60.8 dBi

5. Antenna Gain Horizon: FCC Reference Pattern 6. Antenna Elevation Angle : 9.9° The earth station will radiate interference toward the Atlantic Ocean according to its off-axis side-lobe performance. A conservative analysis, using FCC standard reference pattern, results in off-axis antenna gains of 10.9 dBi toward the Atlantic Ocean. The signal density at the shoreline, through free space is: 600 kHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -14.1 dBw/4 kHz + 10.9 dBi – 10*log[4Π*(27040m)2] = -102.8 dBW/m2/4 kHz + Additional Path Losses (~82.9 dB) = -185.7 dBW/m2/4 kHz 30 MHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -23.7 dBw/4 kHz + 10.9 dBi – 10*log[4Π*(27040m)2] = -112.4 dBW/m2/4 kHz + Additional Path Losses (~82.9 dB) = -195.3 dBW/m2/4 kHz 36 MHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -15.5 dBw/4 kHz + 10.9 dBi – 10*log[4Π*(27040m)2] = -104.2 dBW/m2/4 kHz + Additional Path Losses (~82.9 dB) = -187.1 dBW/m2/4 kHz Our calculations show additional path loss of approximately 82.9 dB including absorption loss and earth diffraction loss for the actual path profiles from the proposed earth station to the nearest shoreline. The calculated PFD including additional path losses to the closest shoreline location is –185.7 dBW/m2/4 kHz for the 600 kHz carriers. The calculated PFD including additional path losses to the closest shoreline location is -195.3 and -187.1 dBW/m2/4 kHz for the 30 and 36 MHz carriers respectively. These PFDs are 18.7 dB (600 kHz), 28.3 dB (30 MHz),and 20.1 dB (36 MHz) below the –167 dBW/m2/4 kHz interference criteria of R&O 96-377. Therefore, there should be no interference to the US Navy RADAR from the Hauppauge earth station due to the distance and the terrain blockage between the site and the shore.

3. Potential Impact to NASA’s Data Relay Satellite System (TDRSS) The geographic location of the Globecomm License Sub LLC earth station in Hauppauge, New York is outside the 390 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 Globecomm License Sub LLC earth station in Hauppauge, New York. 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 an EIRP less than 71 dBW/6 MHz in this band. The 9.3 meter earth station antenna will have an EIRP less than 71 dBW/6 MHz for the 600 kHz and 30 MHz carriers in this band. The total EIRP for the 600 kHz, carrier is 68.5 dBW, while the total EIRP for the 30 MHz, carrier is 75.9 dBW. The equivalent EIRP per 6 MHz segment will remain at 68.5 dBW/6 MHz for the 600 kHz carriers and 70.9 dBW/6 MHz for the 30 MHz carriers. Therefore, there should not be interference to the TDRSS space-to-space link for the 600 kHz to 30 MHz carriers. 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 an EIRP less than 71 dBW/6 MHz in this band. The 9.3 meter earth station antenna will have an EIRP greater than 71 dBW/6 MHz for the 36 MHz carriers in this band. The total EIRP for all carriers is 84.8 dBW, and the equivalent EIRP per 6 MHz segment will be 78.8 dBW/6 MHz. Therefore, there will be interference to the TDRSS space-to-space link (Table 1). In order to meet the 71 dBW/6 MHz interference criteria, the earth station’s 36 MHz carrier would have to be limited to an RF power density 7.9 dB lower than the maximum of -15.5 dBW/4kHz or -23.4 dBW/4kHz for an EIRP of 76.9 dBW. If this operational condition cannot be met, then the Hauppauge, New York earth station may not be tuned to operate at the frequencies in the 13.772 to 13.778 GHz Band. 4. Coordination Issue Result Summary and Conclusions The results of the analysis and calculations performed in this exhibit indicate that compatible operation between the earth station at the Hauppauge facility and the US Navy and NASA systems space-to-earth and space-to-space links are possible for the 600 kHz through 30 MHz carriers. The results of the analysis and calculations performed in this exhibit also indicate that compatible operations between the earth station at the Hauppauge facility and the US Navy and NASA systems space-to-earth link will be possible for the 36 MHz carriers. However, the analysis based on the assumption of a 36 MHz bandwidth carrier indicates that operations in NASA systems space-to-space link (13772.0 to 13778.0 MHz) will not be permitted. Therefore, the 36 MHz carriers will only transmit on frequencies 13,780.0 to 14,000.0 MHz.

Table 1 Excluded Frequency Range for Intelsat License LLC Earth Station System Frequency Restriction TDRSS 13.770-13.780 GHz (see Note 1) Note 1: In order to meet the 71 dBW/6 MHz interference criteria, the earth station’s 36 MHz carriers would have to be limited to a maximum total EIRP of 76.9 dBW. No interference to US Navy RADAR or NASA TDRSS space-to-earth operations from the Hauppauge, New York earth station will occur.


Document Created: 2015-06-26 11:32:25
Document Modified: 2015-06-26 11:32:25
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