REVISED 13 GHZ STUDY SUPPLEMENT by SATCOM DIGITAL NETWORKS, LLC SES-LIC-20120724-00688 E120144

Attachment E120144_13GHzStudy.p

E120144_13GHzStudy.p

SUPPLEMENT submitted by SATCOM DIGITAL NETWORKS, LLC

REVISED 13 GHZ STUDY

2013-01-07

This document pretains to SES-LIC-20120724-00688 for License on a Satellite Earth Station filing.

IBFS_SESLIC2012072400688_979935

Exhibit For
SATCOM Digital Networks
Cranberry Township, Pennsylvania
RSI Satcom 6.4 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 proposed SATCOM Digital
Network’s satellite earth station, to be located in Cranberry Township, Pennsylvania, 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): 40° 42’ 25.0” N, 80° 05’ 44.0” W

• Satellite Location for Earth Station: Amazonas 1 and 2 at 61.0° WL

• Frequency Band: 13.75-14.0 GHz for uplink

• Polarizations: Circular and Linear

• Emissions: 20M0G7W
23M0G7W

• Modulation: Digital

• Maximum Aggregate Uplink EIRP: 80.40 dBW for the 20 MHz Carriers
80.92 dBW for the 23 MHz Carriers

• Transmit Antenna Characteristics
Antenna Size: 6.4 meters in Diameter
Antenna Type/Model: RSI Satcom
Gain: 57.4 dBi

• RF power into Antenna Flange: 20 MHz
23.0 dBW or 10.0 dBW/MHz
or -14.0 dBW/4 kHz

23 MHz
23.52 dBW or 9.9 dBW/ MHz
or -14.1 dBW/4 kHz (Maximum)

• Minimum Elevation Angle:
Cranberry Twp, Pa. 39.0° @ 152.0° Az. (Amazonas 1 & 2) at 61.0° 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 Cranberry Township earth station is approximately
341 km Southeast toward the Chesapeake Bay. The calculation of the power spectral density at
this distance is given by:

20 MHz 23 MHz

1. Clear Sky EIRP: 80.40 dBW 80.92 dBW
2. Carrier Bandwidth: 20.0 MHz 23.0 MHz
3. PD at antenna input: -14.0 -14.1
(dBW/4 kHz)
4. Transmit Antenna Gain: 57.4 dBi
5. Antenna Gain Horizon: FCC Reference Pattern
6. Antenna Elevation Angle: 39.0°

$The proposed earth station will radiate interference toward the Chesapeake Bay according to its off-axis side-lobe performance. A conservative analysis, using FCC standard reference pattern, results in off-axis antenna gains of -9.9 dBi towards the Chesapeake Bay. The signal density at the shoreline, through free space is: 20 MHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -14.0 dBw/4 kHz + (-9.9 dBi) – 10*log[4Π*(341000m)2] = -145.5 dBW/m2/4 kHz + Additional Path Losses (~85.0 dB) = -230.5 dBW/m2/4 kHz 23 MHz Carriers PFD = Antenna Feed Power density (dBW/4 kHz) + Antenna Off-Axis Gain (dBi) – Spread Loss (dBw-m2). = -14.1 dBw/4 kHz + (-9.9 dBi) – 10*log[4Π*(341000m)2] = -145.6 dBW/m2/4 kHz + Additional Path Losses (~85.0 dB) = -230.6 dBW/m2/4 kHz Our calculations indicate additional path loss of approximately 85.0 dB including absorption loss and earth diffraction loss for the actual path profiles from the proposed earth station to the nearest shoreline. For the 20 MHz carriers, the calculated PFD including additional path losses to the closest shoreline location is –230.5 dBW/m2/4 kHz. This is 63.5 dB below the –167 dBW/m2/4 kHz interference criteria of R&O 96-377. For the 23 MHz carriers, the calculated PFD including additional path losses to the closest shoreline location is –230.6 dBW/m2/4 kHz. This is 63.6 dB below the –167 dBW/m2/4 kHz interference criteria of R&O 96-377. Therefore, for the 20 and 23 MHz emissions there should be no interference to the US Navy RADAR from the Cranberry Township 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 SATCOM Digital Networks’ earth station in Cranberry Township, Pennsylvania 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 SATCOM Digital Networks earth station in Cranberry Township.$

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 6.4 meter earth
station antenna will have an EIRP greater than 71 dBW/6 MHz in this band. The total EIRP for
all the 20 MHz carriers is 80.4 dBW, and the equivalent EIRP per 6 MHz segment will be 77.1
dBW/6 MHz. The total EIRP for the 23 MHz carriers is 80.92 dBW, and the equivalent EIRP
per 6 MHz segment will be 77.1 dBW/6 MHz. Therefore, there could be interference to the
TDRSS space-to-space link (Table 1) from both emissions.

For the 20 MHz emissions to meet the 71 dBW/6 MHz interference criteria, the earth station
would have to be limited to an RF power density 6.2 dB lower than the maximum of -14.0
dBW/4kHz or -20.2 dBW/4kHz for an EIRP of 74.2 dBW. For the 23 MHz emissions to meet
the 71 dBW/6 MHz interference criteria, the earth station would have to be limited to an RF
power density 6.6 dB lower than the maximum of -14.1 dBW/4kHz or -20.7 dBW/4kHz for an
EIRP of 74.3 dBW. If this operational condition cannot be met, then the Cranberry Township,
Pennsylvania earth station may not be tuned to operate at the frequencies in the 13.770 to 13.780
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 Cranberry Township facility and the US Navy and
NASA systems space-to-earth link are possible. This analysis has been based on the assumption
of 20 and 23 MHz bandwidth carriers.

Operations in NASA systems space-to-space link (13770.0 to 13780.0 MHz) will not be
permitted.

Table 1

Excluded Frequency Range for SATCOM Digital Networks 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 for the 20 MHz emissions, the
earth station would have to be limited to a maximum total EIRP of 74.2 dBW.

In order to meet the 71 dBW/6 MHz interference criteria for the 23 MHz emissions, the earth
station would have to be limited to a maximum total EIRP of 74.3 dBW.

No interference to US Navy RADAR operations from the Cranberry Township, Pennsylvania
earth station will occur.

Document Created: 2013-01-07 11:45:25
Document Modified: 2013-01-07 11:45:25