Attachment ASTI 0805 Hooper Bay

This document pretains to SES-DBM-20160502-00384 for Database Entry MOD on a Satellite Earth Station filing.

IBFS_SESDBM2016050200384_1135093

DETAILED INTERFERENCE ANALYSIS REPORT
   Transmit/Receive Earth Station




            Prepared For
               Harris
               (FAA)
         Hooper Bay, Alaska
               (HPB)
              (C-band)
   Transmit/Receive Earth Station




         November 21, 2015


                            TABLE OF CONTENTS



I.     Introduction
II.    Contents of Report
III.   Summary of Results
IV.    Conclusions and Recommendations
V.     Operational Parameters and Satellite Data
VI.    Great Circle Interference Case Listing


                        List of Illustrations
                    Transmit/Receive Earth Station


Figure 5.1-1 Proposed Earth Station Location

                                Tables

Table 3.1-1 Interference Case Summary - (6 GHz)
Table 5.1-1 Earth Station Parameters
Table 5.2-1 Earth Station Azimuth Elevation Table
Table 6.1-1 Potential Interference Cases 6 GHz Transmit Band


                              SECTION 1
                             INTRODUCTION
                    Transmit/Receive Earth Station


This    report    presents the results of a detailed interference
analysis for a proposed C-band transmit/receive earth station
location.   The site was selected by Harris and is located in Hooper
Bay, Alaska (HPB).

The analysis was performed for a 4.5 meter antenna. The long term
interference objective at 4 GHz, was -156 dBW/1 MHz, while the 6 GHz
long term interference objective was -154 dBW/4 kHz, as specified by
the FCC.

The earth station was analyzed for transmission and reception of
digital traffic to and from a satellite arc range of 115 to 150
degrees West Longitude. This report assumes that the satellite
transponders are numbered 1 through 24, with each transponder having a
36 MHz bandwidth.

This detailed interference analysis is meant to provide an estimate of
potential interference at this location, and to recommend a course of
future action.


                              SECTION 2
                    REPORT CONTENTS AND PROCEDURES
                    Transmit/Receive Earth Station

This section describes the contents of     the   report   for   a   proposed
C-band transmit/receive earth station.

Section   1 describes the site location, the antenna considered, and
the system parameters considered in the detailed interference
analysis. The analysis was undertaken to determine the potential for
microwave interference for the transmit/receive earth station at the
site specified.

Initially, a computer analysis of this site was performed to determine
the extent of potential interference on a line-of-sight (LOS) basis.
This analysis considers the microwave environment with respect to the
earth station and calculates predicted signal levels     between these
systems. Paths which exceed a given objective level are listed for
further analysis. The objective levels present the             maximum
interference levels allowed between the earth station and          the
surrounding terrestrial microwave environment for the frequency band
of interest.

To further analyze the effect of the predicted interference conflicts,
terrain path profiles were prepared for the critical       cases. This
involves plotting the interference path on topographic maps, typically
7.5 minute series U.S.G.S. maps, to determine the               terrain
characteristics of the path. Once this has been accomplished,
predicted over-the-horizon (O-H) losses are      calculated using the
techniques of the National Bureau of Standards     Technical Note 101
(Revised).

These calculations give the amount of signal attenuation achieved       due
to terrain blockage.


Section 3 summarizes the results of the site analysis. This   summary
includes the number of cases that were considered, the   interference
cases that remain, and the proposed resolution of   the interference
problems.


Tables 3.1-1 and 3.2-1 list the Great Circle interference cases and
the predicted O-H losses calculated on the various 6 and 4 GHz paths,
respectively. If multiple analyses are considered, such as changes in
satellite arc or antenna, the results are presented in Tables 3.1-1.1,
3.1-1.2, 3.2-1.1 3.2-1.2, etc.....

A brief explanation of the various columns shown in Tables 3.1-1               and
3.2-1 follows:

PATH   ID:    This   is the predicted interference path.    The   first
site listed is the transmitter at 4 GHz or the receiver at 6 GHz.

BAND:   This shows the frequency plan of the interfering paths. The 4
GHz paths affect reception of the downlink, while the 6 GHz
terrestrial facilities are affected by the uplink.    Receivers in the
low half of the band (5925 - 6175 MHz), are indicated by 6L.

Receivers in the   high   half   of   the   band   (6175   -   6425    MHz),   are
indicated by 6H.

DIST: This is the distance from the earth station to the              terrestrial
station in kilometers.

AZ: This is the azimuth bearing in degrees (taken from True               North),
from the earth station toward the terrestrial station.

ES DISC: This is the earth station discrimination angle in               degrees,
towards the involved terrestrial facility.

ES GAIN: This is the gain of the earth station in dBi, at the
calculated earth station discrimination angle.

LOS LOSS REQ'D: This is the amount of loss required in dB, on                    a
line-of-sight basis, to meet the interference objective.

O-H   LOSS:  This is the calculated over-the-horizon (O-H) losses in
dB, between the earth station and the involved terrestrial station.
The 20 percent column represents losses for the long term objective.
The 0.0025 and .01 percent columns present the losses for the short
term objective at 6 GHz and 4 GHz, respectively.


REVISED   MARGIN:   This is the difference between the LOS margin and
the predicted     O-H   losses   achieved due to terrain      blockage.
Sufficient attenuation is calculated for the paths which show the word
"CLEAR" in the revised margin. Cases showing a positive revised margin
will require additional losses to meet the interference objective.

The information listed at the bottom of the table reflects the
antennas, satellite arc, and interference objectives considered for
the proposed site.

Section   4  presents   conclusions and recommendations. It   gives
an overall description of the microwave environment and suggests a
future course of action.

Table 5.1-1 contains     the operational parameters for the      proposed
earth station. Tables    5.1-2 provides azimuth and elevation data for
the geostationary arc,   and identifies the locations of particular
satellites within that   arc.

Figure 5.1-1 indicates the location of the site analyzed. This
location should be verified. If it is not the desired site, Comsearch
should be notified immediately so that the precise location can be
analyzed.

Section 6 presents the Great Circle interference cases. This provides
a listing of the utilized channels and type of traffic loading for
each path.


                                     SECTION 3
                            SUMMARY AND RESULTS
The detailed interference analysis for the proposed earth station site
to be located in Hooper Bay (HPB), Alaska revealed that two potential
interference conflicts exist.
                        Transmit Band 5925 - 6425 MHz

A summary of these cases follows:
                                       Line-of-Sight
               Distance     Azimuth       Margin       Revised Margin
Path             (Km)      (Degrees)       (dB)           20% (dB)
Chevak -         29.6         87.6          13.6          13.6
Hooper Bay

Hooper Bay -      1.8         54.9           2.7           2.7
Chevak


Additional blockage will need to be identified in the direction of the
remaining 6 GHz cases, or frequency offsets will need to be
implemented to avoid conflict with the receive frequencies of these
facilities.
Table 6.1-1 provides a summary of the remaining interference conflicts
to the 6 GHz transmit band and their coordinated receive frequencies.


                              SECTION 4
                    CONCLUSIONS AND RECOMMENDATIONS

4.1   Conclusions
Based on the results of the detailed interference analysis, two
potential interference conflicts exist to the 6 GHz transmit band that
could not be cleared with terrain path profiles.
Both of these cases are with a terrestrial path operated by United2,
LLC, the receivers are at Chevak (13.6 dB margin) and Hooper Bay (2.7
dB margin). The predicted margins are based on an earth station
maximum EIRP per carrier of 33.0 dBW/4 kHz. A reduction in the maximum
EIRP per carrier to 30.0 dBW/4 kHz would resolve the case into the
United2, LLC Hooper Bay receiver and just leave the case in Chevak
that operates on receive frequencies of 6404.79 and 6256.54 MHz.
The available spectrum if limited around the Chevak receive
frequencies would be 5925 – 6240, 6273 – 6388, 6421 - 6425 MHz.

4.2   Recommendations
It is recommended that Harris/FAA review the operating parameters of
the proposed earth station antenna and determine whether the above
referenced transmit band restrictions are acceptable. In the event
that they are not, it is recommended that on-site RFI measurements and
path surveys be completed in an attempt to resolve the cases
identified in this report.


                                  Table 5.1-1

                             SATELLITE EARTH STATION
                            FREQUENCY COORDINATION DATA
                                     11/21/2015

Company                    Federal Aviation Administration
Owner Code                                       FEDFAA
Earth Station Name, State                        HOOPER BAY, AK
Latitude (DMS) (NAD83)                           61 31 11.2 N
Longitude (DMS) (NAD83)                          166 8 13.7 W
Ground Elevation AMSL (ft/m)                       26.25 /      8.00
Antenna Centerline AGL (ft/m)                       9.00 /      2.74

Receive Antenna Type:           FCC32                  Scientific-Atlanta
                                                       8345
            4.0 GHz Gain (dBi) / Diameter (m)            43.3 /    4.5
              3 dB / 15 dB Half Beamwidth                0.60 /    1.25

Transmit Antenna Type:          FCC32                  Scientific-Atlanta
                                                       8345
            6.0 GHz Gain (dBi) / Diameter (m)            46.3 /    4.5
              3 dB / 15 dB Half Beamwidth                0.39 /    0.81

Operating Mode                                         TRANSMIT AND RECEIVE
Modulation                                             DIGITAL
Emission / Receive Band (MHz)           191KG7D   233KG7D / 3700.0000 - 4200.0000

Emission / Transmit Band (MHz)          191KG7D   233KG7D /       5925.0000 -   6425.0000

Max. Available RF Power (dBW)/4 kHz)                     -13.30
                        (dBW)/MHz)                        10.70

Max. EIRP                 (dBW)/4 kHz)                    33.00
                          (dBW)/MHz)                      57.00

Max. Permissible Interference Power
           4.0 GHz, 20% (dBW/1 MHz)                     -156.0
           4.0 GHz, 0.0100% (dBW/1 MHz)                 -146.0
           6.0 GHz, 20% (dBW/4 kHz)                     -154.0
           6.0 GHz, 0.0025% (dBW/4 kHz)                 -131.0

Range of Satellite Arc (Geostationary)
Degrees Longitude                                      115.0 W / 150.0 W
Azimuth Range (Min/Max)                                  125.3 / 161.8
Corresponding Elevation Angles                             8.8 / 19.0

Radio Climate                                                 B
Rain Zone                                                     2

Max. Great Circle Coordination Distance (mi./km)
           4.0 GHz                                       442.2 /       711.7
           6.0 GHz                                       154.7 /       248.9

Precipitation Scatter Contour Radius (mi./km)
           4.0 GHz                                       344.3 /       554.1
           6.0 GHz                                        62.1 /       100.0

Note:   Horizon is less than 0.2 degrees at all azimuths


                                       Table 5.2-1

                      Earth Station Azimuth and Elevation Table
                                   11/16/2015

Earth Station Name      HOOPER BAY, AK
Owner                   Federal Aviation Administration
Latitude (DMS) (NAD83) 61 31 11.2 N
Longitude (DMS) (NAD83) 166 8 13.7 W
Ground Elevation (ft/m)        26.25 /    8.00 Amsl
Antenna Centerline (ft/m)       9.00 /    2.74 Agl
Satellite Arc Range       115.0 W
                          150.0 W

    Satellite    Azimuth    Elevation      Satellite
    Longitude   (Degrees)   (Degrees)        Name

      115.0        125.3         8.8        XM 4
      116.0        126.3         9.2
      116.8        127.1         9.5        SATMEX 5
      117.0        127.3         9.6
      118.0        128.2        10.0
      119.0        129.2        10.4
      120.0        130.2        10.8
      121.0        131.2        11.1        GALAXY 23
      121.0        131.2        11.1        ECHOSTAR 9
      122.0        132.2        11.5
      123.0        133.2        11.9        GALAXY 10R
      124.0        134.2        12.2
      125.0        135.2        12.6        GALAXY 14
      126.0        136.2        12.9
      127.0        137.2        13.2        GALAXY 13
      127.0        137.2        13.2        HORIZONS 1
      128.0        138.2        13.6
      129.0        139.3        13.9        GALAXY 27
      130.0        140.3        14.2
      131.0        141.3        14.5        AMC 11
      132.0        142.4        14.8
      133.0        143.4        15.1        GALAXY 15
      134.0        144.4        15.4
      135.0        145.5        15.7        AMC 10
      136.0        146.6        16.0
      137.0        147.6        16.3        AMC 7
      138.0        148.7        16.5
      139.0        149.8        16.8        AMC 8
      140.0        150.8        17.0
      141.0        151.9        17.3
      142.0        153.0        17.5
      143.0        154.1        17.7
      144.0        155.2        17.9
      145.0        156.3        18.1
      146.0        157.4        18.3
      147.0        158.5        18.5
      148.0        159.6        18.7
      149.0        160.7        18.9
      150.0        161.8        19.0


                                     Table 6.1-1

                        Great Circle Interference Conflicts
                                   11/16/2015

Earth Station Name      HOOPER BAY, AK
Owner                   Federal Aviation Administration
Latitude (DMS) (NAD83) 61 31 11.2 N
Longitude (DMS) (NAD83) 166 8 13.7 W
Ground Elevation (ft/m)        26.25 /     8.00 Amsl
Antenna Centerline (ft/m)       9.00 /     2.74 Agl
Antenna Model               FCC REFERENCE 32-25LOG(THETA)
Objectives: Receive       -156.0 (dBW /1 MHz)
            Transmit      -154.0 (dBW /4 kHz) Tx Power    -13.3 (dBW/4 kHz)

       Terrestrial Path                Gnd   Edisct    Ges FsLoss Dist Pr Tpwr Plan
    Latitude   Longitude Call Sign     Acl   Tdisct    Gts Tant     Az Margin LL
    Owner                                                   Loading
    Freq/Pol

   1 CHEVAK      AKHOOPER BAY AK       15.20 38.6     -7.6 137.7   29.6-140.4 31.1HT
     61 31 48 165 34 54 WQHH679        22.86 358.1    21.5 52610A 87.6 13.6    3.3
    UNIINC: United2, LLC                                 2016CH   DIG RCN: 08022718
   6404.7900V
    Status: L                          Equipment: TEMC52 Emission: 30M0D7W
     OH LOSS 20% / 0.0025%:     0.00   /   0.00


   2 CHEVAK      AKHOOPER BAY AK       15.20 38.6     -7.6 137.7   29.6-140.4 31.1HT
     61 31 48 165 34 54 WQHH679        22.86 358.1    21.5 52610A 87.6 13.6    3.3
    UNIINC: United2, LLC                                 2016CH   DIG RCN: 07060126
   6256.5400V
    Status: L                          Equipment: TEMC52 Emission: 30M0D7W
     OH LOSS 20% / 0.0025%:     0.00   /   0.00


   3 HOOPER BAY AKCHEVAK       AK      6.00 70.7 -10.0 113.2    1.8-151.3 31.1LT
     61 31 44 166 6 36 WQHM636       13.72 145.4 -11.5 52610A 54.9 2.7     3.3
    UNIINC: United2, LLC                             2016CH   DIG RCN: 08022718
   6152.7500V
    Status: L                        Equipment: TEMC52 Emission: 30M0D7W
     OH LOSS 20% / 0.0025%:     0.00 /    0.00


   4 HOOPER BAY AKCHEVAK       AK      6.00 70.7 -10.0 113.2    1.8-151.3 31.1LT
     61 31 44 166 6 36 WQHM636       13.72 145.4 -11.5 52610A 54.9 2.7     3.3
    UNIINC: United2, LLC                             2016CH   DIG RCN: 07060126
   6004.5000V
    Status: L                        Equipment: TEMC52 Emission: 30M0D7W
     OH LOSS 20% / 0.0025%:     0.00 /    0.00


Figure 5.1-1


                                                    Table 3.1-1
                                             Interference Case Summary
                                                Hooper Bay, Alaska
                                                             ES     ES      LOS Loss   OH Loss        Revised   Margin
Case                              Band    Distance Azimuth   Disc   Gain    Required   20%    0.01%   20%       0.01%
#                       Path ID   (GHz)   (km)     (°)       (°)    (dBi)   (dB)       (dB)   (dB)    (dB)      (dB)
1      CHEVAK       HOOPER BAY    6.1     29.6     87.6      38.6   -7.6    13.6        0.0   0.0     13.6      CLEAR
2      CHEVAK       HOOPER BAY    6.1     29.6     87.6      38.6   -7.6    13.6        0.0   0.0     13.6      CLEAR
3      HOOPER BAY   CHEVAK        6.1     1.8      54.9      70.7   -10.0   2.7         0.0   0.0     2.7       CLEAR
4      HOOPER BAY   CHEVAK        6.1     1.8      54.9      70.7   -10.0   2.7         0.0   0.0     2.7       CLEAR




Antenna Type:            4.5 Meter
Uplink Power:         -13.3 dBW/4 kHz
Satellite Arc:       115.0 W to 150.0 W
Objectives: Long Term: -154.0 dBW/4 kHz          Short Term: -131.0 dBW/4 kHz



Document Created: 2015-11-21 11:07:39
Document Modified: 2015-11-21 11:07:39

© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC