Attachment Coordination report SES-LIC-INTR2019-01138

Attachment Coordination report

This document pretains to SES-LIC-INTR2019-01138 for License on a Satellite Earth Station filing.

IBFS_SESLICINTR201901138_1657878

FREQUENCY COORDINATION AND INTERFERENCE
ANALYSIS REPORT

Prepared for
Arctic Slope Telephone Assoc Coop., Inc.
DILLINGHAM, AK
Satellite Earth Station

Prepared By:
COMSEARCH
19700 Janelia Farm Boulevard
Ashburn, VA 20147
April 18, 2019

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

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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.

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2. SUMMARY OF RESULTS

A number of great circle interference cases were identified during the interference study of
the proposed earth station. Each of the cases, which exceeded the interference objective
on a line-of-sight basis, was profiled and the propagation losses estimated using NBS
TN101 (Revised) techniques. The losses were found to be sufficient to reduce the signal
levels to acceptable magnitudes in every case.

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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 04/11/2019.

Company
United Utilities, Inc.

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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.

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

Date: 04/18/2019
Job Number: 190411COMSGE03
Administrative Information
Status ENGINEER PROPOSAL
Call Sign
Licensee Code ARCTIC
Licensee Name Arctic Slope Telephone Assoc Coop., Inc.

Site Information DILLINGHAM, AK
Venue Name
Latitude (NAD 83) 59° 2' 28.6" N
Longitude (NAD 83) 158° 31' 26.4" W
Climate Zone B
Rain Zone 2
Ground Elevation (AMSL) 22.3 m / 73.2 ft

Link Information
Satellite Type Geostationary
Mode TR - Transmit-Receive
Modulation Digital
Satellite Arc 101° W to 139° West Longitude
Azimuth Range 118.6° to 157.5°
Corresponding Elevation Angles 7.4° / 20.9°
Antenna Centerline (AGL) 2.74 m / 9.0 ft

Antenna Information Receive - FCC32 Transmit - FCC32
Manufacturer Viking Viking
Model 3.8 meter 3.8 meter
Gain / Diameter 42.0 dBi / 3.8 m 46.2 dBi / 3.8 m
3-dB / 15-dB Beamwidth 1.40° / 3.20° 0.90° / 2.00°

Max Available RF Power (dBW/4 kHz) -16.3
(dBW/MHz) 7.7

Maximum EIRP (dBW/4 kHz) 29.9
(dBW/MHz) 53.9

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) 3M40G7W / 3700.0 - 4200.0 3M40G7W / 5925.0 - 6425.0

Max Great Circle Coordination Distance 747.8 km / 464.6 mi 240.4 km / 149.4 mi
Precipitation Scatter Contour Radius 574.2 km / 356.7 mi 100.0 km / 62.1 mi

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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 Arctic Slope Telephone Assoc Coop., Inc.
Latitude (NAD 83) 59° 2' 28.6" N
Longitude (NAD 83) 158° 31' 26.4" W
Ground Elevation (AMSL) 22.3 m / 73.2 ft
Antenna Centerline (AGL) 2.74 m / 9.0 ft
Antenna Model Viking 3.8 meter
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 -16.3 (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 0.36 118.39 -10.00 360.72 -10.00 121.32
5 0.41 113.44 -10.00 345.51 -10.00 116.84
10 0.36 108.48 -10.00 360.39 -10.00 121.22
15 0.38 103.52 -10.00 352.32 -10.00 118.82
20 0.48 98.57 -10.00 328.09 -10.00 113.23
25 0.41 93.60 -10.00 345.07 -10.00 116.71
30 0.39 88.64 -10.00 349.75 -10.00 118.07
35 0.45 83.68 -10.00 335.41 -10.00 115.38
40 0.42 78.71 -10.00 344.66 -10.00 116.16
45 0.31 73.76 -10.00 374.89 -10.00 125.62
50 0.37 68.80 -10.00 357.36 -10.00 120.32
55 0.40 63.84 -10.00 347.82 -10.00 117.51
60 0.36 58.89 -10.00 359.90 -10.00 121.07
65 0.33 53.95 -10.00 369.78 -10.00 124.05
70 0.22 49.02 -10.00 404.61 -10.00 134.98
75 0.00 44.13 -9.12 423.29 -9.12 140.65
80 0.00 39.22 -7.84 439.94 -7.84 145.52
85 0.00 34.34 -6.40 459.50 -6.40 151.18
90 0.00 29.49 -4.74 482.33 -4.74 158.22
95 0.00 24.70 -2.82 511.21 -2.82 166.97
100 0.00 20.00 -0.53 547.76 -0.53 178.15
105 0.00 15.48 2.26 595.31 2.26 192.86
110 0.00 11.35 5.62 656.89 5.62 212.56
115 0.00 8.25 9.09 726.99 9.09 234.06
120 0.00 7.53 10.07 747.85 10.07 240.41
125 0.00 9.46 7.61 696.22 7.61 224.66
130 0.00 11.55 5.43 653.24 5.43 211.43
135 0.00 13.54 3.71 621.50 3.71 201.39
140 0.00 15.38 2.33 596.54 2.33 193.24
145 0.00 17.06 1.20 576.90 1.20 187.15
150 0.00 18.55 0.29 561.32 0.29 182.33
155 0.00 19.86 -0.45 549.02 -0.45 178.54
160 0.00 20.95 -1.03 539.49 -1.03 175.61
165 0.00 22.12 -1.62 530.05 -1.62 172.71
170 0.00 24.17 -2.58 514.84 -2.58 168.07
175 0.00 26.97 -3.77 496.71 -3.77 162.56
180 0.00 30.29 -5.03 478.11 -5.03 156.94
185 0.00 34.00 -6.29 461.00 -6.29 151.63

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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 Arctic Slope Telephone Assoc Coop., Inc.
Latitude (NAD 83) 59° 2' 28.6" N
Longitude (NAD 83) 158° 31' 26.4" W
Ground Elevation (AMSL) 22.3 m / 73.2 ft
Antenna Centerline (AGL) 2.74 m / 9.0 ft
Antenna Model Viking 3.8 meter
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 -16.3 (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 37.97 -7.49 444.64 -7.49 146.90
195 0.00 42.13 -8.61 429.76 -8.61 142.53
200 0.00 46.43 -9.67 416.32 -9.67 138.63
205 0.00 50.83 -10.00 412.20 -10.00 137.43
210 0.00 55.30 -10.00 412.20 -10.00 137.43
215 0.22 59.78 -10.00 405.72 -10.00 135.34
220 0.51 64.31 -10.00 319.95 -10.00 110.78
225 0.51 68.94 -10.00 319.96 -10.00 110.78
230 0.51 73.59 -10.00 319.96 -10.00 110.78
235 0.51 78.26 -10.00 319.96 -10.00 110.78
240 0.23 82.95 -10.00 402.83 -10.00 134.41
245 0.23 87.63 -10.00 402.82 -10.00 134.41
250 0.39 92.31 -10.00 351.02 -10.00 118.44
255 0.39 96.99 -10.00 351.04 -10.00 118.45
260 0.39 101.66 -10.00 351.03 -10.00 118.45
265 0.39 106.33 -10.00 351.03 -10.00 118.44
270 0.39 110.97 -10.00 351.03 -10.00 118.44
275 0.39 115.59 -10.00 351.03 -10.00 118.44
280 0.00 120.10 -10.00 412.20 -10.00 137.43
285 0.00 124.63 -10.00 412.20 -10.00 137.43
290 0.32 129.21 -10.00 372.44 -10.00 124.87
295 0.00 133.51 -10.00 412.20 -10.00 137.43
300 0.00 137.81 -10.00 412.20 -10.00 137.43
305 0.00 141.97 -10.00 412.20 -10.00 137.43
310 0.00 145.94 -10.00 412.20 -10.00 137.43
315 0.26 149.82 -10.00 393.01 -10.00 131.28
320 0.30 153.21 -10.00 379.88 -10.00 127.16
325 0.26 152.74 -10.00 390.63 -10.00 130.53
330 0.22 147.90 -10.00 406.43 -10.00 135.57
335 0.20 143.02 -10.00 410.97 -10.00 137.04
340 0.20 138.12 -10.00 411.99 -10.00 137.37
345 0.00 133.17 -10.00 412.20 -10.00 137.43
350 0.00 128.25 -10.00 412.20 -10.00 137.43
355 0.28 123.33 -10.00 385.34 -10.00 128.86

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Document Created: 2019-04-18 10:20:08
Document Modified: 2019-04-18 10:20:08

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