Summary and supporting material

0363-EX-ST-2011 Text Documents

Harris Caprock Communications, Inc.

2011-06-06ELS_116690

Application for Special Temporary Authority (STA) ‐ Supporting Information

Applicant: Harris Caprock Communications, Inc.
STA File number: 0363‐EX‐ST‐2011
STA Confirmation: EL505754

General Summary

This application for a Special Temporary Authority (STA) is to license the test and operation of three
satellite terminals to test performance and link availability to a US‐licensed satellite (Intelsat‐903,
34.5°WL) using frequencies in the C‐band (4/6 GHz).

The terminals use a VSAT antenna of diameter 60cm, and achieve compatibility with adjacent satellites
through the use of spread‐spectrum modulation to reduce the power density and hence maintain off‐
axis power levels to below the levels required to comply with FCC regulations on 2° orbital spacing.

Compatibility with terrestrial systems has been assessed for each of the three antennas by COMSEARCH.

Operation is required for a period of six months between June 13th and December 13th, 2011.

Supporting Information

The following attachments provide supporting information to this application:

(1) Non‐ionising radiation analysis (source: Harris Caprock)

(2) Off‐Axis EIRP analysis, demonstrating compatibility with FCC requirements (source: Harris
Caprock)

(3) Letter from satellite operator detailing permitted operating conditions (source: Intelsat)

(4) Co‐ordination analysis for Houston, TX, antenna (source: COMSEARCH)

(5) Co‐ordination analysis for Mountainside, MD, antenna (source: COMSEARCH)

(6) Co‐ordination analysis for Melbourne, FL, antenna (source: COMSEARCH)

1. Far Field distance Calculation

The distance to the beginning of the far field can be determined from the following
equation:

Distance to the Far Field Region Rff = 0.60 D2 / λ
=4.5 m

The maximum main beam power density in the far field can be determined from the
following equation:

On-Axis Power Density in the Far-Field Sff = G P / (4 π Rff2)
=10 W/m2
= 1mW/cm2

2. Near field Calculation

Power Flux Density is considered to be at a maximum value throughout the entire length
of the defined Near Field region. The region is contained within a cylindrical volume
having the same diameter as the antenna. Past the boundary of the Near Field region,
the power density from the antenna decreases linearly with respect to increasing
distance.

The distance to the end of the Near Field can be determined using the following
equation:

Extent of the Near Field Rnf = D2 / (4 λ)
= 1.875 m

The maximum power Flux Density in the Near Field can be determined from the
following equation:

Near Field Power Flux Density Snf = 16 η P / (π D2)
= 3.6 mW/cm2

3. Transition Region Power Density

The transition region is located between the Near and Far Field regions. The power
density begins to decrease linearly with increasing distance in the Transition region.
While the power density decreases inversely with distance in the transition region, the
power density decreases inversely with the square of the distance in the Far Field
Region. The maximum power density calculation in Section 1 is the highest power
density the antenna can produce in any of the regions away from the antenna. The
power density at a distance Rt can be determined from the following equation:

Transition Region Power Density St = Snf Rnf / Rt
= 1.5 mW/cm2

4. Main Reflector Region

The power density in the main reflector is determined using the following equation:

Power Density at Main Reflector Ssurface = 4 P / Asurface
= 5.6 mW/cm2

5. Region Between the Main Reflector and the Ground

Assuming uniform illumination of the reflector surface, the power density between the
antenna and the ground can be determined from the following equation:

Power density between Reflector and Ground Sg = P / Asurface
= 1.4 mW/cm2

6. Summary of Calculations

Region Calculated Maximum Radiation Hazard assessment
power Density Level (mW/cm2)
1. Far Field Sff 9.8 Satisfies FCC MPE
2. Near Field Snf 3.6 Satisfies FCC MPE
3. Transition Region St 0.99 Satisfies FCC MPE
(Rnf<Rt<Rff)
4. Main Reflector Ssurface 5.6 Satisfies FCC MPE
5. Between Main Reflector Sg 1.4 Satisfies FCC MPE
and Ground
Table 4. Summary of Expected Radiation Levels for Uncontrolled Environments

1. Far Field Sff 1.875 Satisfies FCC MPE
2. Near Field Snf 3.6 Satisfies FCC MPE
3. Transition Region St 1.5 Satisfies FCC MPE
(Rnf<Rt<Rff)
4. Main Reflector Ssurface 5.6 Satisfies FCC MPE
5. Between Main Reflector Sg 1.4 Satisfies FCC MPE
and Ground
Table 4. Summary of Expected Radiation Levels for Controlled Environments

It is the applicant’s responsibility to ensure that the public and operational personnel are
not exposed to harmful levels of radiation.

Harris CapRock
FCC Off-Axis EIRP Mask Calculation
BUC (W) 3.5 5
Bandwidth (kHz) 1250 625

Actual
Tx Gain Actual EIRP
ITU Tx Gain EIRP
Theta[deg] (linear (dBW/4kHz
mask (dBi) (dBW/4kH
pole) )
z)
1.00 31.74 24.12 27.12 7.61 12.17
2.00 24.77 23.24 26.24 6.74 11.30
3.00 20.37 20.07 23.07 3.56 8.12
4.00 17.25 17.68 20.68 1.17 5.73
5.00 14.83 10.67 13.67 -5.84 -1.28
6.00 12.85 5.28 8.28 -11.23 -6.67
7.00 11.17 -11.22 -8.22 -27.73 -23.17
8.00 11.30 -1.49 1.51 -18.00 -13.44
9.00 11.30 4.64 7.64 -11.87 -7.31
10.00 10.30 6.12 9.12 -10.39 -5.83
11.00 9.27 6.97 9.97 -9.54 -4.98
12.00 8.32 6.25 9.25 -10.26 -5.70
13.00 7.45 1.97 4.97 -14.54 -9.98
14.00 6.65 -1.91 1.09 -18.42 -13.86
15.00 5.90 -7.28 -4.28 -23.79 -19.23
16.00 5.20 -6.01 -3.01 -22.51 -17.96
17.00 4.54 -8.47 -5.47 -24.98 -20.42
18.00 3.92 -11.40 -8.40 -27.90 -23.35
19.00 3.33 -2.89 0.11 -19.40 -14.84
20.00 2.77 -0.43 2.57 -16.94 -12.38
21.00 2.24 1.26 4.26 -15.25 -10.69
22.00 1.74 0.81 3.81 -15.70 -11.14
23.00 1.26 -1.91 1.09 -18.42 -13.86
24.00 0.79 -3.16 -0.16 -19.66 -15.10
25.00 0.35 -3.98 -0.98 -20.49 -15.93
26.00 -0.07 -4.18 -1.18 -20.69 -16.13
27.00 -0.48 -6.90 -3.90 -23.41 -18.85
28.00 -0.88 -7.93 -4.93 -24.44 -19.88
29.00 -1.26 -2.75 0.25 -19.25 -14.69
30.00 -1.63 1.11 4.11 -15.40 -10.84
31.00 -1.98 2.25 5.25 -14.26 -9.70
32.00 -2.33 2.80 5.80 -13.71 -9.15
33.00 -2.66 3.12 6.12 -13.38 -8.82
34.00 -2.99 3.09 6.09 -13.42 -8.86
35.00 -3.30 2.96 5.96 -13.55 -8.99
36.00 -3.61 2.87 5.87 -13.63 -9.08
37.00 -3.91 2.50 5.50 -14.00 -9.44
38.00 -4.19 2.29 5.29 -14.21 -9.66
39.00 -4.48 1.90 4.90 -14.61 -10.05
40.00 -4.75 1.85 4.85 -14.66 -10.10
41.00 -5.02 2.09 5.09 -14.42 -9.86
42.00 -5.28 2.23 5.23 -14.28 -9.72
43.00 -5.54 2.28 5.28 -14.23 -9.67
44.00 -5.79 2.06 5.06 -14.44 -9.88
45.00 -6.03 1.27 4.27 -15.24 -10.68
46.00 -6.27 0.78 3.78 -15.73 -11.17
47.00 -6.50 -0.36 2.64 -16.87 -12.31
48.00 -6.73 -0.99 2.01 -17.49 -12.93

FCC Off-axis Mask Maximum EIRP Density Specification Theta[deg]
26.3-25log(theta) 1~7
5.3 dBW/4kHz 7 ~ 9.2
29.3-25log(theta) 9.2 ~ 48

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

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 Access Partnership and Schlumberger and is located at
Houston, Texas.

The analysis was performed for a 0.6 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 at 34.5 West (325.5 East) degrees
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 3
SUMMARY AND RESULTS

The detailed interference analysis for the proposed earth station site to
be located at Houston, Texas revealed that 59 potential interference
conflicts exist. After considering the over-the-horizon (O-H) losses,
47 cases were found to have sufficient losses to resolve the predicted
margins. A discussion of the remaining cases is presented below.

Transmit Band 5925 - 6425 MHz

In the 6 GHz transmit band, there were 12 cases where insufficient
blockage existed. A summary of these cases follows:
Line-of-Sight
Distance Azimuth Margin Revised Margin
Path (Km) (Degrees) (dB) 20% (dB)
Genoa - 11.4 75.7 17.9 17.9
Hobby
2100 W Loop - 19.5 326.9 16.6 16.6
Alvin
Copperfield - 43.6 322.3 16.3 4.3
Gessner
Alvin - 19.0 140.7 14.4 14.4
2100 W Loop

Alvin - 26.2 134.8 14.1 14.1
Pearland

El Camino - 18.8 97.7 7.7 7.7
Ellington

Downtown MTSO - 19.4 344.6 6.4 6.4
Mandel
S Houston - 10.3 57.1 5.9 5.9
Windheather

Algoa - 25.5 144.7 4.9 4.9
Chigger Relo

Windheater - 8.7 254.7 3.4 3.4
S Houston
Pearland - 11.6 156.4 2.9 2.9
Almeda
Alvin - 26.0 162.3 2.5 2.5
Pearland

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.

3.2 Receive Band 3700 to 4200 MHz

No cases exist in the 4 GHz receive band.

SECTION 4

CONCLUSIONS AND RECOMMENDATIONS

4.1 Conclusions

Based on the results of the detailed interference analysis, 12 potential
interference conflicts exist to the 6 GHz transmit band that could not be
cleared with terrain path profiles. In the event that on-site RFI
measurements and path surveys cannot resolve these cases it would be
necessary to limit the earth station transmit band around the receive
frequencies of the identified 6 GHz receivers. The limited frequencies
would be 5925 – 5929, 6110 – 6136, 6169 – 6181, 6243 – 6270 and 6303 –
6425 MHz.

4.2 Recommendations
It is recommended that Access Partnership/Schlumberger 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
04/21/2011

Company SCHLUMBERGER
Owner Code
Earth Station Name, State HOUSTON, TX
Latitude (DMS) (NAD83) 29 35 54.0 N
Longitude (DMS) (NAD83) 95 20 50.0 W
Ground Elevation AMSL (ft/m) 51.00 / 15.54
Antenna Centerline AGL (ft/m) 6.00 / 1.83

Receive Antenna Type: FCC32 FCC REFERENCE
32-25LOG(THETA)
4.0 GHz Gain (dBi) / Diameter (m) 25.0 / 0.6
3 dB / 15 dB Half Beamwidth 2.25 / 5.00

Transmit Antenna Type: FCC32 FCC REFERENCE
32-25LOG(THETA)
6.0 GHz Gain (dBi) / Diameter (m) 28.0 / 0.6
3 dB / 15 dB Half Beamwidth 1.50 / 3.25

Operating Mode TRANSMIT AND RECEIVE
Modulation DIGITAL
Emission / Receive Band (MHz) 6K25G7W 1M25G7W / 3700.0000 - 4200.0000

Emission / Transmit Band (MHz) 6K25G7W 1M25G7W / 5925.0000 - 6425.0000

Max. Available RF Power (dBW)/4 kHz) -16.00
(dBW)/MHz) 8.00

Max. EIRP (dBW)/4 kHz) 12.00
(dBW)/MHz) 36.00

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 34.0 W / 35.0 W
Azimuth Range (Min/Max) 105.1 / 105.7
Corresponding Elevation Angles 16.3 / 17.2

Radio Climate A
Rain Zone 2

Max. Great Circle Coordination Distance (mi./km)
4.0 GHz 229.8 / 369.8
6.0 GHz 101.2 / 162.8

Precipitation Scatter Contour Radius (mi./km)
4.0 GHz 319.6 / 514.3
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
04/21/2011

Earth Station Name HOUSTON, TX
Owner SCHLUMBERGER
Latitude (DMS) (NAD83) 29 35 54.0 N
Longitude (DMS) (NAD83) 95 20 50.0 W
Ground Elevation (ft/m) 51.00 / 15.54 Amsl
Antenna Centerline (ft/m) 6.00 / 1.83 Agl
Satellite Arc Range 34.0 W
35.0 W

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

34.0 105.1 16.3
34.5 105.4 16.7 INTELSAT 903
35.0 105.7 17.2

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

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 Access Partnership and Schlumberger and is located at
Mountainside, Maryland.

The analysis was performed for a 0.6 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 at 34.5 West (325.5 East) degrees
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 3
SUMMARY AND RESULTS

The detailed interference analysis for the proposed earth station site to
be located at Mountainside, Maryland revealed that 18 potential
interference conflicts exist. After considering the over-the-horizon
(O-H) losses, 15 cases were found to have sufficient losses to resolve
the predicted margins. A discussion of the remaining cases is presented
below.
Transmit Band 5925 - 6425 MHz

In the 6 GHz transmit band, there were three cases where insufficient
blockage existed. A summary of these cases follows:

Line-of-Sight
Distance Azimuth Margin Revised Margin
Path (Km) (Degrees) (dB) 20% (dB)
Sideling Hil - 47.6 281.8 5.2 5.2
Clear Spg

Catoctin - 25.2 117.6 4.6 4.6
Clear Spring
Hagerstown - 5.2 13.4 1.4 1.4
Clear Spg

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.

3.2 Receive Band 3700 to 4200 MHz

No cases exist in the 4 GHz receive band after terrain pathloss
calculations that could present an interference conflict at this
location. The predicted interference margin is based on a downlink long
term interference objective of -156 dBW/ 1 MHz.

SECTION 4

CONCLUSIONS AND RECOMMENDATIONS

4.1 Conclusions

Based on the results of the detailed interference analysis, three
potential interference conflicts exist to the 6 GHz transmit band that
could not be cleared with terrain path profiles. In the event that on-
site RFI measurements and path surveys cannot resolve these cases it
would be necessary to limit the earth station transmit band around the
receive frequencies of the identified 6 GHz receivers. The limited
frequencies would be 5925 – 5958, 5990 – 6077, 6109 – 6136, 6168 – 6425
MHz.

4.2 Recommendations
It is recommended that Access Partnership/Schlumberger 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
04/28/2010

Company SCHLUMBERGER
Owner Code
Earth Station Name, State MOUNTAINSIDE, MD
Latitude (DMS) (NAD83) 39 36 1.0 N
Longitude (DMS) (NAD83) 77 45 30.0 W
Ground Elevation AMSL (Ft/m) 565.00 / 172.21
Antenna Centerline AGL (Ft/m) 6.00 / 1.83

Receive Antenna Type: FCC32 FCC REFERENCE
32-25LOG(THETA)
4.0 GHz Gain (dBi) / Diameter (m) 25.0 / 0.6
3 dB / 15 dB Half Beamwidth 4.50 / 10.00

Transmit Antenna Type: FCC32 FCC REFERENCE
32-25LOG(THETA)
6.0 GHz Gain (dBi) / Diameter (m) 28.0 / 0.6
3 dB / 15 dB Half Beamwidth 3.00 / 6.50

Operating Mode TRANSMIT AND RECEIVE
Modulation DIGITAL
Emission / Receive Band (MHz) 6K25G7W 1M25G7W / 3700.0000 - 4200.0000

Emission / Transmit Band (MHz) 6K25G7W 1M25G7W / 5925.0000 - 6425.0000

Max. Available RF Power (dBW)/4 kHz) -16.00
(dBW)/MHz) 8.00

Max. EIRP (dBW)/4 kHz) 12.00
(dBW)/MHz) 36.00

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 34.0 W / 35.0 W
Azimuth Range (Min/Max) 123.7 / 124.6
Corresponding Elevation Angles 26.0 / 26.7

Radio Climate A
Rain Zone 2

Max. Great Circle Coordination Distance (Mi/Km)
4.0 GHz 205.8 / 331.3
6.0 GHz 90.1 / 145.0

Precipitation Scatter Contour Radius (Mi/Km)
4.0 GHz 307.0 / 494.1
6.0 GHz 62.1 / 100.0

Table 5.2-1

Earth Station Azimuth and Elevation Table
04/28/2010

Earth Station Name MOUNTAINSIDE, MD
Owner SCHLUMBERGER
Latitude (DMS) (NAD83) 39 36 1.0 N
Longitude (DMS) (NAD83) 77 45 30.0 W
Ground Elevation (Ft/m) 565.00 / 172.21 AMSL
Antenna Centerline (Ft/m) 6.00 / 1.83 AGL
Satellite Arc Range 34.0 W
35.0 W

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

34.0 123.7 26.0
34.5 124.1 26.3 INTELSAT 903
35.0 124.6 26.7

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

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 Access Partnership and Schlumberger and is located at
Melbourne, Florida.

The analysis was performed for a 0.6 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 at 34.5 West (325.5 East) degrees
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 3
SUMMARY AND RESULTS

The detailed interference analysis for the proposed earth station site to
be located at Melbourne, Florida revealed that three potential
interference conflicts exist. After considering the over-the-horizon
(O-H) losses, two cases were found to have sufficient losses to resolve
the predicted margins. A discussion of the remaining case is presented
below.

Transmit Band 5925 - 6425 MHz

In the 6 GHz transmit band, there was one case where insufficient
blockage existed. A summary follows:

Line-of-Sight
Distance Azimuth Margin Revised Margin
Path (Km) (Degrees) (dB) 20% (dB)
Kenansville - 44.6 239.5 22.7 11.0
Melbourne

Additional blockage will need to be identified in the direction of this
remaining 6 GHz case, or frequency offsets will need to be implemented to
avoid conflict with the receive frequencies of this facility.

Table 6.1-1 provides a summary of the remaining interference conflicts to
the 6 GHz transmit band and the coordinated receive frequencies.

3.2 Receive Band 3700 to 4200 MHz
No cases exist in the 4 GHz receive band.

SECTION 4

CONCLUSIONS AND RECOMMENDATIONS

4.1 Conclusions

Based on the results of the detailed interference analysis, one potential
interference conflict exists to the 6 GHz transmit band that could not be
cleared with terrain path profiles. In the event that on-site RFI
measurements and path surveys cannot resolve these cases it would be
necessary to limit the earth station transmit band around the receive
frequencies of the identified 6 GHz receiver. The limited frequencies
would be 5925 – 6181, 6214 – 6425 MHz.

4.2 Recommendations
It is recommended that Access Partnership/Schlumberger 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
04/21/2011

Company SCHLUMBERGER
Owner Code
Earth Station Name, State MELBOURNE, FL
Latitude (DMS) (NAD83) 28 5 23.0 N
Longitude (DMS) (NAD83) 80 38 19.0 W
Ground Elevation AMSL (ft/m) 24.00 / 7.32
Antenna Centerline AGL (ft/m) 6.00 / 1.83

Receive Antenna Type: FCC32 FCC REFERENCE
32-25LOG(THETA)
4.0 GHz Gain (dBi) / Diameter (m) 25.0 / 0.6
3 dB / 15 dB Half Beamwidth 2.25 / 5.00

Transmit Antenna Type: FCC32 FCC REFERENCE
32-25LOG(THETA)
6.0 GHz Gain (dBi) / Diameter (m) 28.0 / 0.6
3 dB / 15 dB Half Beamwidth 1.50 / 3.25

Operating Mode TRANSMIT AND RECEIVE
Modulation DIGITAL
Emission / Receive Band (MHz) 6K25G7W 1M25G7W / 3700.0000 - 4200.0000

Emission / Transmit Band (MHz) 6K25G7W 1M25G7W / 5925.0000 - 6425.0000

Max. Available RF Power (dBW)/4 kHz) -16.00
(dBW)/MHz) 8.00

Max. EIRP (dBW)/4 kHz) 12.00
(dBW)/MHz) 36.00

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 34.0 W / 35.0 W
Azimuth Range (Min/Max) 114.0 / 114.7
Corresponding Elevation Angles 29.7 / 30.6

Radio Climate A
Rain Zone 1

Max. Great Circle Coordination Distance (mi./km)
4.0 GHz 199.4 / 320.8
6.0 GHz 87.3 / 140.5

Precipitation Scatter Contour Radius (mi./km)
4.0 GHz 348.5 / 560.9
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
04/21/2011

Earth Station Name MELBOURNE, FL
Owner SCHLUMBERGER
Latitude (DMS) (NAD83) 28 5 23.0 N
Longitude (DMS) (NAD83) 80 38 19.0 W
Ground Elevation (ft/m) 24.00 / 7.32 Amsl
Antenna Centerline (ft/m) 6.00 / 1.83 Agl
Satellite Arc Range 34.0 W
35.0 W

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

34.0 114.0 29.7
34.5 114.3 30.2 INTELSAT 903
35.0 114.7 30.6

Document Created: 2011-06-06 11:10:29
Document Modified: 2011-06-06 11:10:29

© 2025 FCC.report
This site is not affiliated with or endorsed by the FCC