Attachment Exhibit A

This document pretains to SES-MOD-20181030-03716 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2018103003716_1562220

                                            Exhibit A

                                    Frequency Coordination


Per 47 C.F.R. Ch. 1 §25.130(b), attached is a “Frequency Coordination and Interference Analysis
Report” performed pursuant to 47 C.F.R. Ch. 1 §25.203.


FREQUENCY COORDINATION AND INTERFERENCE
            ANALYSIS REPORT


                    Prepared for
             GCI Communications Corp.
                  Chignik Bay, AK
               Satellite Earth Station




                     Prepared By:
                    COMSEARCH
             19700 Janelia Farm Boulevard
                 Ashburn, VA 20147
                   October 17, 2018


                                                      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                                             10/17/2018                        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   10/17/2018         Page 3 of 10


2. SUMMARY OF RESULTS


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


No carriers reported potential interference cases.




Frequency Coordination and Interference Analysis Report   10/17/2018        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 on10/02/2018.




Frequency Coordination and Interference Analysis Report            10/17/2018            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            10/17/2018            Page 6 of 10


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



Date:                                    10/02/2018
Job Number:                              181002COMSTC12
Administrative Information
Call Sign                                E960430
Licensee Code                            P3203
Licensee Name                            GCI Communications Corp.
Site Information                         CHIGNIK BAY, AK
Latitude (NAD 83)                        56° 18' 5.4" N
Longitude (NAD 83)                       158° 24' 50.4" W
Climate Zone                             B
Rain Zone                                2
Ground Elevation (AMSL)                  15.85 m / 52.0 ft
Link Information
Satellite Type                           Geostationary
Mode                                     TR - Transmit-Receive
Modulation                               Digital
Satellite Arc                            94° W to 223° West Longitude
Azimuth Range                            111.7° to 248.4°
Corresponding Elevation Angles           5.2° / 5.1°
Antenna Centerline (AGL)                 3.08 m / 10.1 ft
Antenna Information                            Receive                                 Transmit
Manufacturer                                   Viasat / Scientific-Atlanta             Viasat / Scientific-Atlanta
Model                                          8136                                    8136
Gain / Diameter                                41.8 dBi / 3.6 m                        45.9 dBi / 3.6 m
3-dB / 15-dB Beamwidth                         1.40° / 3.00°                           0.90° / 1.70°

                                                                                     45K0G7W - 108MG7W
                                                                                     45K0D7W - 108MD7W
Max Available RF Power        (dBW/4 kHz)                                               -2.7    -18.29
                              (dBW/MHz)                                                 21.3      5.71

Maximum EIRP                  (dBW/4 kHz)                                              43.2     27.61
                              (dBW/MHz)                                                67.2     51.61
                              (dBW)                                                    53.71    71.92


Interference Objectives:    Long Term          -156.0 dBW/MHz        20%               -154.0 dBW/4 kHz        20%
                            Short Term         -146.0 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)               45K0G7W - 108MG7W / 3700.0 - 4200.0     45K0G7W - 108MG7W / 5925.0 - 6425.0
                                               45K0D7W - 108MD7W / 3700.0 - 4200.0     45K0D7W - 108MD7W / 5925.0 - 6425.0


Max Great Circle Coordination Distance         559.0 km / 347.3 mi                     325.2 km / 202.0 mi
Precipitation Scatter Contour Radius           617.6 km / 383.7 mi                     101.6 km / 63.1 mi




Frequency Coordination and Interference Analysis Report                      10/17/2018             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             CHIGNIK BAY, AK
Licensee Name                     GCI Communications Corp.
Latitude (NAD 83)                 56° 18' 5.4" N
Longitude (NAD 83)                158° 24' 50.4" W
Ground Elevation (AMSL)           15.85 m / 52.0 ft
Antenna Centerline (AGL)          3.08 m / 10.1 ft
Antenna Mode                             Receive 4.0 GHz                           Transmit 6.1 GHz
Interference Objectives: Long Term       -156.0 dBW/MHz 20%                        -154.0 dBW/4 kHz         20%
                         Short Term      -146.0 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              12.72             111.37                  -10.00          101.63               -10.00         100.00
 5              12.72             106.58                  -10.00          101.63               -10.00         100.00
 10             11.25             101.66                  -10.00          108.18               -10.00         100.00
 15             10.99              96.69                  -10.00          109.31               -10.00         100.00
 20             10.53              91.72                  -10.00          111.40               -10.00         100.00
 25             10.53              86.74                  -10.00          111.40               -10.00         100.00
 30              6.53              81.73                  -10.00          119.79               -10.00         100.00
 35              6.53              76.73                  -10.00          119.79               -10.00         100.00
 40              0.51              71.79                  -10.00          319.32               -10.00         152.68
 45              0.00              66.82                  -10.00          412.20               -10.00         200.77
 50              0.00              61.85                  -10.00          412.20               -10.00         200.77
 55              0.00              56.88                  -10.00          412.20               -10.00         200.77
 60              0.00              51.91                  -10.00          412.20               -10.00         200.77
 65              1.53              46.83                   -9.76          225.42                -9.76         111.00
 70              2.70              41.78                   -8.53          182.23                -8.53         100.00
 75              4.04              36.74                   -7.13          152.04                -7.13         100.00
 80              3.35              31.77                   -5.55          177.86                -5.55         100.00
 85              3.72              26.76                   -3.69          177.21                -3.69         100.00
 90              4.06              21.75                   -1.44          180.83                -1.44         100.00
 95              4.47              16.74                    1.41          191.48                 1.41         100.00
100              4.21              11.76                    5.24          218.97                 5.24         106.36
105              4.65               6.75                   11.28          253.97                11.28         118.86
110              5.30               1.73                   26.08          556.04                26.08         322.34
115              5.01               1.85                   25.29          469.98                25.29         253.29
120              6.34               3.14                   19.57          342.59                19.57         171.99
125              6.77               5.07                   14.38          243.81                14.38         117.01
130              9.99               4.38                   15.97          237.43                15.97         114.60
135             12.64               3.97                   17.03          217.22                17.03         106.36
140             12.87               5.61                   13.27          191.99                13.27         100.00
145             14.16               6.06                   12.44          176.49                12.44         100.00
150             13.82               7.83                    9.66          165.00                 9.66         100.00
155             13.43               9.48                    7.58          157.89                 7.58         100.00
160             10.41              13.50                    3.74          161.41                 3.74         100.00
165              8.89              15.86                    1.99          160.10                 1.99         100.00
170              6.41              18.95                    0.06          159.98                 0.06         100.00
175              8.06              17.69                    0.81          157.49                 0.81         100.00
180             12.04              13.85                    3.46          149.08                 3.46         100.00
185             11.78              13.97                    3.37          150.08                 3.37         100.00



Frequency Coordination and Interference Analysis Report                10/17/2018            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             CHIGNIK BAY, AK
Licensee Name                     GCI Communications Corp.
Latitude (NAD 83)                 56° 18' 5.4" N
Longitude (NAD 83)                158° 24' 50.4" W
Ground Elevation (AMSL)           15.85 m / 52.0 ft
Antenna Centerline (AGL)          3.08 m / 10.1 ft
Antenna Mode                             Receive 4.0 GHz                           Transmit 6.1 GHz
Interference Objectives: Long Term       -156.0 dBW/MHz 20%                        -154.0 dBW/4 kHz         20%
                         Short Term      -146.0 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             10.54              14.84                    2.72          155.62                 2.72         100.00
195             10.52              14.25                    3.16          157.85                 3.16         100.00
200             10.93              12.99                    4.16          159.57                 4.16         100.00
205             10.11              12.70                    4.40          166.86                 4.40         100.00
210             6.89               14.47                    2.99          172.68                 2.99         100.00
215             6.43               13.34                    3.87          179.22                 3.87         100.00
220             6.32               11.71                    5.29          187.63                 5.29         100.00
225             6.77                9.36                    7.72          199.96                 7.72         100.00
230             6.77                7.29                   10.42          216.94                10.42         105.56
235             6.68                5.15                   14.21          243.07                14.21         116.71
240             6.32                3.14                   19.58          345.47                19.58         173.88
245             6.67                0.53                   38.92          509.16                38.92         275.45
250             7.31                2.70                   21.22          559.03                21.22         325.18
255             9.95                8.15                    9.21          194.38                 9.21         100.00
260             8.82               12.14                    4.89          174.89                 4.89         100.00
265             7.58               16.75                    1.40          162.08                 1.40         100.00
270             9.60               22.01                   -1.57          142.26                -1.57         100.00
275             9.60               26.92                   -3.75          133.46                -3.75         100.00
280             9.60               31.86                   -5.58          126.77                -5.58         100.00
285             10.76              36.94                   -7.19          118.72                -7.19         100.00
290             10.76              41.88                   -8.55          114.67                -8.55         100.00
295             12.40              47.01                   -9.80          103.64                -9.80         100.00
300             12.14              51.91                  -10.00          104.21               -10.00         100.00
305             12.14              56.85                  -10.00          104.22               -10.00         100.00
310             12.43              61.82                  -10.00          102.89               -10.00         100.00
315             12.44              66.77                  -10.00          102.88               -10.00         100.00
320             11.60              71.69                  -10.00          106.61               -10.00         100.00
325             15.35              76.79                  -10.00          100.00               -10.00         100.00
330             15.35              81.71                  -10.00          100.00               -10.00         100.00
335             15.36              86.63                  -10.00          100.00               -10.00         100.00
340             15.36              91.55                  -10.00          100.00               -10.00         100.00
345             15.35              96.47                  -10.00          100.00               -10.00         100.00
350             15.35             101.38                  -10.00          100.00               -10.00         100.00
355             15.35             106.30                  -10.00          100.00               -10.00         100.00




Frequency Coordination and Interference Analysis Report                10/17/2018            Page 9 of 10


5. CERTIFICATION




I HEREBY CERTIFY THAT I AM THE TECHNICALLY QUALIFIED PERSON RESPONSIBLE FOR THE
PREPARATION OF THE FREQUENCY COORDINATION DATA CONTAINED IN THIS APPLICATION,
THAT I AM FAMILIAR WITH PARTS 101 AND 25 OF THE FCC RULES AND REGULATIONS, THAT I
HAVE EITHER PREPARED OR REVIEWED THE FREQUENCY COORDINATION DATA SUBMITTED
WITH THIS APPLICATION, AND THAT IT IS COMPLETE AND CORRECT TO THE BEST OF MY
KNOWLEDGE AND BELIEF.




Timothy O. Crutcher
Frequency Planner
COMSEARCH
19700 Janelia Farm Boulevard
Ashburn, VA 20147


DATED: October 17, 2018




Frequency Coordination and Interference Analysis Report   10/17/2018   Page 10 of 10



Document Created: 2018-10-23 08:35:55
Document Modified: 2018-10-23 08:35:55

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