Attachment Skehan-Env Statement SES-LIC-20130930-00840

Attachment Skehan-Env Statement

This document pretains to SES-LIC-20130930-00840 for License on a Satellite Earth Station filing.

IBFS_SESLIC2013093000840_1013612

EXHIBIT E

ENGINEERING STATEMENT
ENVIRONMENTAL STATEMENT FOR
NEW SATELLITE KU UPLINK TRUCK
ON BEHALF OF
SKEHAN COMMUNICATIONS, LLC
TO BE OPERATED IN WASHINGTON, DC AREA
SEPTEMBER 2013

COHEN, DIPPELL AND EVERIST, P.C.
CONSULTING ENGINEERS
RADIO AND TELEVISION
WASHINGTON, D.C.

Cohen, Dippell and Everist, P.C.
Engineering Statement
Skehan Communications, LLC PAGE 1

Introduction

This engineering statement provides an environmental assessment to accompany the

application for Ku-band satellite truck. The engineering statement has been prepared on behalf of

Skehan Communications, LLC. Skehan Communications, LLC proposes to construct a transportable

transmit Ku-band satellite uplink truck.

The following provides the technical information.

The details for the environmental assessment are provided below.

1) Applicant:

Skehan Communications, LLC

2) Site Location:

N/A - Transportable in the Washington, DC area

3) Type of Domestic Service:

a) Class of Station - Vehicle-mounted earth station

b) Regulatory Class - Private

c) Type of Facility - Transmit-Only

4) Frequency Bands: Transmit 14.0-14.5 GHz

5) Points of Communications: ALSAT

6) Site Elevation Above Mean Sea Level: N/A - Transportable

7) Transmitting Equipment:

a) Number of high power amplifiers 1

b) Manufacturer and Model No.: Advantech Wireless,

Model SSPBM-K100-CRE

c) Maximum Power Output (watts) each: 125 watts

Cohen, Dippell and Everist, P.C.
Engineering Statement
Skehan Communications, LLC PAGE 3

Environmental Assessment

Based on the off-axis radiation characteristics of the 1.25 meter truck-mounted General

Dynamics, Model No. C125M parabolic uplink antenna, the proposed operation complies with

Section 1.1307 of the FCC Rules as it meets the provisions of the limits adopted by the Commission

for Maximum Permissible Exposure (MPE)1 at all locations surrounding the truck at two meters

above ground level.

For an antenna input power of 108.87 Watts, the radio frequency power density outside of

the 1.25 meter diameter project cylinder in front of the antenna will be less than 5 µW/m².

The antenna is attached atop a van as shown in Exhibit E-1 of this engineering statement.

The center of radiation for the antenna is located 3.58 meters (11 feet, 9 inches) above ground level.

The radio frequency power density levels behind the antenna system, and at 2 meters above ground

level around the van, will be less than 5 µW/m². The applicant states that transmitting system will

be placed in the non-operative mode when authorized personnel are working on the top of the van.

The applicant states it will ensure that its portable uplink system will be operated in such a

way as to contribute less than 1% of the allowable MPE limit to site areas containing

non-categorically excluded stations. In order to obtain proper illumination of the satellite, the

proposed uplink will be operated such that the major on-axis 1.25 meter cylinder, plus its

accompanying 5E cone, will be located well away from buildings or towers. The minimum vertical

operating angle to any domestic satellite will be at least 15E above the horizon.

For a 1.25 meter diameter parabolic antenna at 14.25 GHz, an antenna input power of 108.87

watts (50.369 dBm) and antenna gain of 43.4 dBi, the results of the five equations2 follows:

1
See Appendix A of OET Bulletin No. 65, Edition 97-01, August 1997.
2
See OET Bulletin No. 65, Edition 97-01, August 1997, Pages 27 and 28.

Cohen, Dippell and Everist, P.C.
Engineering Statement
Skehan Communications, LLC PAGE 4

1. Extent of Near Field (Equation) Page

R(nf) = D² / 4 Lambda (12) 27
= 18.6 m (61 feet)

2. Maximum Near Field On-Axis Power Density

S(nf) = 16ηP / Pi D² (13) 28
= 23.066 mW/cm², for η = 0.65

3. Distance to Beginning of Far Field Region

R(ff) = 0.6 D² / Lambda (16) 29
= 44.64 m (146.5 feet)

4. Transition Region

S=[S(nf) R (nf)] / R (17) 29
= 23.066 mW/cm² @ 18.6 m to 9.62 mW/cm² @ 44.6 m

5. Far Field

S = PG / 4 Pi R² (18) 29
= 9.511 mW/cm²
Radiation Hazard Study
Antenna Diameter (D) = 1.25 meters
Antenna Surface Area (AS) = 1.227 m²
Wavelength at 14.25 GHz (λ) = 0.02103806709 m
Power at Flange = 125 Watts (20.969 dBm)
Antenna Gain at 14.25 GHz = 43.4 dBi
Antenna Aperture Efficiency (η) = 0.65

Radiation Hazard
Region Distance Level Assessment
meters mW/cm²
Far Field 44.64 9.511 Potential Hazard
Far Field off-axis -- 0.09511 Complies with MPE
Transition Field (RT) 18.6<(RT)<44.64 <23.066 Potential Hazard
Near Field 1.857 23.066 Potential Hazard

Cohen, Dippell and Everist, P.C.
Engineering Statement
Skehan Communications, LLC PAGE 5

Near Field off-axis -- 0.231 Meets ANSI
requirements
Between Main Reflector -- N/A --
and Subreflector
Main Reflector Region (Wm) 17.743 Potential Hazard
Between Reflector and -- 8.872 Potential Hazard
Ground (WG)
Between Reflector and -- -- Complies with MPE
Ground at 2 meters

An environmental assessment (“EA”) is, therefore, categorically excluded under Section

1.1307 of the FCC Rules and Regulations since the applicant indicates:

(a)(1) to (a)(8) The proposed operation is truck-mounted portable unit and not
subject to these subsections.

(b) Workers and the general public will not be subjected to RF radiation levels
in excess of the FCC adopted limits for Maximum Permissible Exposure
(MPE) as set forth in Table 1, Limits for MPE of Appendix A of OET
Bulletin No. 65, Edition 97-01, August 1997. Authorized personnel will be
alerted to areas of the truck where potential radiation levels are in excess of
the MPE standard. The transmitting equipment will be placed in the non-
operative mode when authorized personnel are on the truck bed. Workers
will ensure that uplink operations will contribute less than 1% of the
applicable RF exposure limit to the site areas of any non-categorically
excluded facilities including AM and FM radio stations, TV stations, LPTV
and TV translator stations, FM booster stations with ERP > 100 watts, ITFS,
MDS, and MMDS stations with ERP > 200 watts, experimental stations, and
other satellite earth stations. The operation will be in full accordance with
FCC Public Notice, Report No. DS-1202 entitled, Guidelines for Filing
Domestic Satellite Earth Station Applications, Released June 10, 1992.

Environmental Considerations
The facility will not be located in any officially designated wilderness area or wildlife

preserve. The facility does not protect, shelter, or affect any threatened or endangered species nor

will it result in the destruction or adverse modification of proposed or existing critical habitats. The

Cohen, Dippell and Everist, P.C.
Engineering Statement
Skehan Communications, LLC PAGE 6

facility will not affect districts, sites, buildings, structures or objects significant in American history,

architecture, archaeology, engineering or culture.

The facility will not affect Indian religious sites and is not located in a flood plain.

Construction of the facility will not involve significant change in surface features, nor be equipped

with high intensity white lights.

Based on the above, the facility will not cause exposure to workers or the general public to

levels of radio frequency radiation in excess of Maximum Permissible Exposure limits.

The applicant anticipates that the facility will meet or exceed MPE objectives of the OET

Bulletin No. 65, Evaluating Compliance with FCC Guidelines for Human Exposure to

Radiofrequency Electromagnetic Fields, Edition 97-01, August 1997. During operation, the

applicant indicates that all personnel will be restricted from areas where hazardous radiation will

be encountered. Equipment shielding and warning signs will be employed as needed.

Document Created: 2013-09-17 13:47:01
Document Modified: 2013-09-17 13:47:01

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