Attachment 13GHzStudy_SouthMtn. SES-LIC-20170407-00375

Attachment 13GHzStudy_SouthMtn.

This document pretains to SES-LIC-20170407-00375 for License on a Satellite Earth Station filing.

IBFS_SESLIC2017040700375_1253089

Exhibit For
SES Americom, LLC
South Mountain (Somis), California
GD Satcom 9 Meter Earth Station

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 SES Americom, LLC satellite
earth station in South Mountain (Somis), California is in compliance with FCC REPORT &
ORDER 96-377. 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): 34° 19’ 31.2” N, 118° 59’ 43.6” W

• Satellite Location for Earth Station: SES 10 (68.5° W)

• Frequency Band: 13.75-14.0 GHz for uplink

• Polarizations: Linear

• Emissions: N0N, 100KG7W, 1M00G7W, 36M0G7W and 54M0G7W

• Modulation: No Modulation and Digital

• Maximum Aggregate Uplink EIRP: 39.5 dBW for the N0N Carrier
53.5 dBW for the 100 kHz Carriers
63.5 dBW for the 1 MHz Carriers
79.0 dBW for the 36 MHz Carriers
80.8 dBW for the 54 MHz Carriers
• Transmit Antenna Characteristics
Antenna Size: 9.0 meters in Diameter
Antenna Type/Model: GD Satcom
Gain: 60.1 dBi

• RF power into Antenna Flange: No Modulation (N0N)
-20.6 dBW
or -20.6 dBW/4 kHz (Maximum)

• RF power into Antenna Flange 100 kHz
(Continued) -6.6 dBW
or -20.6 dBW/4 kHz

1 MHz
3.4 dBW
or -20.6 dBW/4 kHz (Maximum)

36 MHz
18.9 dBW
or –20.6 dBW/4 kHz (Maximum)

54 MHz
20.7 dBW
or –20.6 dBW/4 kHz (Maximum)

• Minimum Elevation Angle:
Somis, CA 22.5° @ 113.7° Az. (SES 10) at 66.9° 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 – 14.0 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.

$36 MHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -20.6 dBw/4 kHz + (-4.8) dBi – 10*log[4Π*(28770m)2] = -125.6 dBW/m2/4 kHz + Additional Path Losses (~41.8 dB) = -167.4 dBW/m2/4 kHz 54 MHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -20.6 dBw/4 kHz + (-4.8) dBi – 10*log[4Π*(28770m)2] = -125.6 dBW/m2/4 kHz + Additional Path Losses (~41.8 dB) = -167.4 dBW/m2/4 kHz Our calculations identified additional path losses of approximately 41.8 dB including absorption loss and earth diffraction loss for the actual path profiles from the earth station to the nearest shoreline. The worst case calculated PFD including additional path losses to the closest shoreline location is –167.4 dBW/m2/4 kHz for the CW Carriers, 100 kHz, 1 MHz, 36 MHz and 54 MHz carriers. This is 0.4 dB 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 South Mountain 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 SES Americom earth station in South Mountain (Somis), California 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 SES Americom earth station in South Mountain, 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 an EIRP less than 71 dBW/6 MHz in this band. The 9 meter earth station antenna will have an EIRP less than 71 dBW/6 MHz for both the CW carrier, 100 kHz and 1 MHz carriers in this band. The total EIRP for the CW Carrier is 39.5 dBW and the equivalent EIRP per 6 MHz segment will remain at 39.5 dBW/6 MHz. The total EIRP for the 100 kHz, carriers is 53.5 dBW. The equivalent EIRP per 6 MHz segment will remain at 53.5 dBW/6 MHz. The total EIRP for the 1 MHz, carriers is 63.5 dBW. The equivalent EIRP per 6 MHz segment will remain at 63.5 dBW/6 MHz. Therefore, there should not be interference to the TDRSS space-to-space link for the CW carriers or the 100 kHz and 1 MHz carriers. For the 36 MHz and 54 MHz carriers, the total EIRP of 79.0 dBW (36 MHz), and 80.8 dBW (54 MHz)$

equate to an EIRP per 6 MHz of 73.0 dBW/6 MHz and 74.8 dBW/6 MHz, respectively. To avoid
interference to the TDRSS space-to-space link the 36 MHz and 54 MHz carriers will not be used
for the transmit spectrum of 13.772 to 13.778 GHz by this earth station.

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 South Mountain (Somis) facility and the US Navy and
NASA systems space-to-earth link are possible for all of the proposed carriers. Operations in
NASA systems space-to-space link (13772.0 to 13778.0 MHz) will also be permitted for all of
the carriers with the exception of the 36 MHz and 54 MHz emissions.

Document Created: 2017-07-27 09:39:38
Document Modified: 2017-07-27 09:39:38