Attachment Exhibit A SES-MOD-20101216-01583

Attachment Exhibit A

This document pretains to SES-MOD-20101216-01583 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2010121601583_857062

FREQUENCY COORDINATION AND INTERFERENCE
ANALYSIS REPORT

Prepared for
GCI Communication Corporation
DILLINGHAM, AK
Satellite Earth Station

Prepared By:
COMSEARCH
19700 Janelia Farm Boulevard
Ashburn, VA 20147
December 02, 2010

TABLE OF CONTENTS
1. CONCLUSIONS ............................................................................................................................................ 3
2. SUMMARY OF RESULTS ............................................................................................................................ 4
3. SUPPLEMENTAL SHOWING....................................................................................................................... 5
4. EARTH STATION COORDINATION DATA.................................................................................................. 6
5. CERTIFICATION......................................................................................................................................... 10

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 2 of 10

1. CONCLUSIONS

An interference study considering all existing, proposed and prior coordinated microwave
facilities within the coordination contours of the proposed earth station demonstrates that
this site will operate satisfactorily with the common carrier microwave environment.
Further, there will be no restrictions of its operation due to interference considerations.

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 3 of 10

2. SUMMARY OF RESULTS

There were no great circle interference cases were identified during the interference study
of the proposed earth station.

No carriers reported potential interference cases.

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 4 of 10

3. SUPPLEMENTAL SHOWING
Pursuant to Part 25.203(c) of the FCC Rules and Regulations, the satellite earth station proposed in this
application was coordinated by Comsearch using computer techniques and in accordance with Part 25 of
the FCC Rules and Regulations.

Coordination data for this earth station was sent to the below listed carriers with a letter dated 12/02/2010.

Company
NUSHAGAK ELECTRIC & TELEPHONE COOP

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 5 of 10

4. EARTH STATION COORDINATION DATA
This section presents the data pertinent to frequency coordination of the proposed earth station that was
circulated to all carriers within its coordination contours.

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 6 of 10

COMSEARCH
Earth Station Data Sheet
19700 Janelia Farm Boulevard, Ashburn, VA 20147
(703)726-5500 http://www.comsearch.com

Date: 12/02/2010
Job Number: 101202COMSTC01
Administrative Information
Licensee Name GCI Communication Corporation
Site Information DILLINGHAM, AK
Latitude (NAD 83) 59° 2' 22.3" N
Longitude (NAD 83) 158° 27' 25.9" W
Climate Zone B
Rain Zone 2
Ground Elevation (AMSL) 26.52 m / 87.0 ft
Link Information
Satellite Type Geostationary
Mode TR - Transmit-Receive
Modulation Digital
Satellite Arc 97° W to 145° West Longitude
Azimuth Range 115.0° to 164.4°
Corresponding Elevation Angles 5.6° / 22.0°
Antenna Centerline (AGL) 2.8 m / 9.2 ft
Antenna Information Receive Transmit
Manufacturer Patriot 3.8 Patriot 3.8
Gain / Diameter 42.0 dBi / 3.8 m 46.1 dBi / 3.8 m
3-dB / 15-dB Beamwidth 0.52° / 1.06° 0.36° / 0.72°

6K72G7W - 36M0G7W
6K72D7W - 36M0D7W
Max Available RF Power (dBW/4 kHz) -2.7 -16.52
(dBW/MHz) 21.3 7.48

Maximum EIRP (dBW/4 kHz) 43.4 29.58
(dBW/MHz) 45.16 53.58
(dBW) 45.16 69.12

Interference Objectives: Long Term -158.0 dBW/MHz 20% -154.0 dBW/4 kHz 20%
Short Term -148.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025%
Frequency Information Receive 4.0 GHz Transmit 6.1 GHz
Emission / Frequency Range (MHz) 6K72G7W - 36M0G7W / 3700.0 - 4200.0 6K72G7W - 36M0G7W / 5925.0 - 6425.0
6K72D7W - 36M0D7W / 3700.0 - 4200.0 6K72D7W - 36M0D7W / 5925.0 - 6425.0

Max Great Circle Coordination Distance 870.7 km / 541.0 mi 380.5 km / 236.4 mi
Precipitation Scatter Contour Radius 610.5 km / 379.3 mi 101.2 km / 62.9 mi

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 7 of 10

COMSEARCH
Earth Station Data Sheet
19700 Janelia Farm Boulevard, Ashburn, VA 20147
(703)726-5500 http://www.comsearch.com

Coordination Values DILLINGHAM, AK
Licensee Name GCI Communication Corporation
Latitude (NAD 83) 59° 2' 22.3" N
Longitude (NAD 83) 158° 27' 25.9" W
Ground Elevation (AMSL) 26.52 m / 87.0 ft
Antenna Centerline (AGL) 2.8 m / 9.2 ft
Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz
Interference Objectives: Long Term -158.0 dBW/MHz 20% -154.0 dBW/4 kHz 20%
Short Term -148.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025%
Max Available RF Power -2.7 (dBW/4 kHz)

Receive 4.0 GHz Transmit 6.1 GHz
Horizon Antenna Horizon Coordination Horizon Coordination
Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km)
0 0.00 114.88 -10.00 437.80 -10.00 200.77
5 0.00 109.91 -10.00 437.80 -10.00 200.77
10 0.00 104.94 -10.00 437.80 -10.00 200.77
15 0.00 99.96 -10.00 437.80 -10.00 200.77
20 0.00 94.98 -10.00 437.80 -10.00 200.77
25 0.00 90.01 -10.00 437.80 -10.00 200.77
30 0.00 85.03 -10.00 437.80 -10.00 200.77
35 0.00 80.06 -10.00 437.80 -10.00 200.77
40 0.00 75.08 -10.00 437.80 -10.00 200.77
45 0.00 70.11 -10.00 437.80 -10.00 200.77
50 0.00 65.13 -10.00 437.80 -10.00 200.77
55 0.00 60.16 -10.00 437.80 -10.00 200.77
60 0.00 55.20 -10.00 437.80 -10.00 200.77
65 0.00 50.23 -10.00 437.80 -10.00 200.77
70 0.00 45.28 -9.40 445.83 -9.40 204.23
75 0.00 40.33 -8.14 463.04 -8.14 211.60
80 0.00 35.39 -6.72 482.62 -6.72 220.15
85 0.00 30.47 -5.10 506.90 -5.10 230.28
90 0.00 25.58 -3.20 536.78 -3.20 242.56
95 0.00 20.74 -0.92 574.78 -0.92 257.90
100 0.00 15.99 1.91 625.14 1.91 276.71
105 0.00 11.44 5.54 694.84 5.54 306.02
110 0.00 7.49 10.14 793.47 10.14 347.63
115 0.00 5.57 13.35 870.73 13.35 380.52
120 0.00 7.24 10.51 801.87 10.51 351.27
125 0.00 9.46 7.61 737.86 7.61 324.26
130 0.00 11.56 5.43 692.64 5.43 305.10
135 0.00 13.54 3.71 658.53 3.71 290.80
140 0.00 15.38 2.33 632.31 2.33 279.92
145 0.00 17.06 1.20 612.28 1.20 271.43
150 0.00 18.56 0.29 595.86 0.29 264.76
155 0.00 19.86 -0.45 582.91 -0.45 259.53
160 0.00 20.95 -1.03 572.85 -1.03 257.13
165 0.00 21.82 -1.47 565.32 -1.47 254.11
170 0.00 22.62 -1.86 558.74 -1.86 251.46
175 0.00 24.26 -2.62 546.14 -2.62 246.36
180 0.00 26.70 -3.66 529.30 -3.66 239.50
185 0.00 29.75 -4.84 510.92 -4.84 231.94

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 8 of 10

COMSEARCH
Earth Station Data Sheet
19700 Janelia Farm Boulevard, Ashburn, VA 20147
(703)726-5500 http://www.comsearch.com

Coordination Values DILLINGHAM, AK
Licensee Name GCI Communication Corporation
Latitude (NAD 83) 59° 2' 22.3" N
Longitude (NAD 83) 158° 27' 25.9" W
Ground Elevation (AMSL) 26.52 m / 87.0 ft
Antenna Centerline (AGL) 2.8 m / 9.2 ft
Antenna Mode Receive 4.0 GHz Transmit 6.1 GHz
Interference Objectives: Long Term -158.0 dBW/MHz 20% -154.0 dBW/4 kHz 20%
Short Term -148.0 dBW/MHz 0.01% -131.0 dBW/4 kHz 0.0025%
Max Available RF Power -2.7 (dBW/4 kHz)

Receive 4.0 GHz Transmit 6.1 GHz
Horizon Antenna Horizon Coordination Horizon Coordination
Azimuth (°) Elevation (°) Discrimination (°) Gain (dBi) Distance (km) Gain (dBi) Distance (km)
190 0.00 33.23 -6.04 492.71 -6.04 224.38
195 0.00 37.02 -7.21 475.55 -7.21 217.17
200 0.00 41.04 -8.33 460.39 -8.33 210.47
205 0.00 45.23 -9.38 446.00 -9.38 204.30
210 0.00 49.53 -10.00 437.80 -10.00 200.77
215 0.00 53.93 -10.00 437.80 -10.00 200.77
220 0.00 58.39 -10.00 437.80 -10.00 200.77
225 0.00 62.91 -10.00 437.80 -10.00 200.77
230 0.00 67.46 -10.00 437.80 -10.00 200.77
235 0.00 72.05 -10.00 437.80 -10.00 200.77
240 0.00 76.65 -10.00 437.80 -10.00 200.77
245 0.00 81.28 -10.00 437.80 -10.00 200.77
250 0.00 85.91 -10.00 437.80 -10.00 200.77
255 0.00 90.55 -10.00 437.80 -10.00 200.77
260 0.00 95.18 -10.00 437.80 -10.00 200.77
265 0.00 99.81 -10.00 437.80 -10.00 200.77
270 0.00 104.43 -10.00 437.80 -10.00 200.77
275 0.00 109.04 -10.00 437.80 -10.00 200.77
280 0.00 113.61 -10.00 437.80 -10.00 200.77
285 0.00 118.16 -10.00 437.80 -10.00 200.77
290 0.00 122.67 -10.00 437.80 -10.00 200.77
295 0.00 127.12 -10.00 437.80 -10.00 200.77
300 0.00 131.49 -10.00 437.80 -10.00 200.77
305 0.00 135.77 -10.00 437.80 -10.00 200.77
310 0.00 139.92 -10.00 437.80 -10.00 200.77
315 0.00 143.89 -10.00 437.80 -10.00 200.77
320 0.00 147.62 -10.00 437.80 -10.00 200.77
325 0.00 149.54 -10.00 437.80 -10.00 200.77
330 0.00 144.62 -10.00 437.80 -10.00 200.77
335 0.00 139.69 -10.00 437.80 -10.00 200.77
340 0.00 134.74 -10.00 437.80 -10.00 200.77
345 0.00 129.78 -10.00 437.80 -10.00 200.77
350 0.00 124.82 -10.00 437.80 -10.00 200.77
355 0.00 119.85 -10.00 437.80 -10.00 200.77

Frequency Coordination and Interference Analysis Report 12/02/2010 Page 9 of 10

Document Created: 2010-12-02 14:24:34
Document Modified: 2010-12-02 14:24:34

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