Attachment RadHaz.pdf

This document pretains to SES-LIC-20070515-00651 for License on a Satellite Earth Station filing.

IBFS_SESLIC2007051500651_567013

                                 EXHIBIT A                                 (Page 1 of 3)




                    RADIATION HAZARD STUDY

This radiation hazard study describes the R.F. radiation environment of the
permanent fixed Ku-band uplink operated by Walla Walla College.
This fixed earth station uplink is located at a lattitude of 46d - 02m - 48s North
& longitude of 118d -23m - 36s West, in College Place, WA.

This study is done to comply with the requirements of Section 1.1307(b) of
the rules of the Federal Communications Commission. All calculations
conform to the proceedures presented in OET Bulletin No. 65 for aperature
antennas.


Transmit antenna: Channel Master 2.4 meter KU-band
Antenna Diameter D 2.4. m
Antenna Efficency η    67. %

Transmitter: 4 watt output flange SSPA, operated at 50% power
Transmit Power        P 4. watt. 50. %                        mw
                                                                             watt
                       P = 2 watt                                            1000

                        at 14.0 GHz                     at 14.5 GHz
Antenna Gain            G1     49.10                    G2       49.30
Wavelength              λ1     2.14285. cm              λ2       2.06896. cm


Calculations for the Near Field (Fresnel Region)

 Extent of the Near Field
                                    2                                 2
                                  D                                 D
                        R n1                              R n2
                                 4. λ
                                   1                               4. λ
                                                                     2
                        R n1 = 67.2 m                     R n2 = 69.6 m


Maximum Near Field
Power Density
                               16. η. P
                        Sn
                                        2
                                π. D
                                            mw
                        S n = 0.118
                                                 2
                                            cm


Calculations for the Far Field (Fraunhofer Region)                            (Page 2 of 3)




                                   at 14.0 GHz                 at 14.5 GHz

                                                  2                            2
                                           0.6. D                       0.6. D
Distance to Far Field             R f1                         R f2
                                           λ1                           λ2
                                  R f1 = 161.281 m             R f2 = 167.04 m

                                                G1                           G2
                                                10                           10
Absolute Gain of Antenna          G a1     10                  G a2     10


                                            P. G a1                      P. G a2
Maximum Far Field Power           S f1                         S f2
                                                     2                             2
Density                                   4. π. R f1                    4. π. R f2

                                                 mw                               mw
                                  S f1 = 0.05                  S f2 = 0.049
                                                      2                                2
                                                 cm                               cm



Calculations for the Transition Zone

The farthest point in the near field is the beginning of the transition zone -
                                         R t1        R n2

                                         R t1 = 69.6 m

The end of the Transition Zone is the beginning of the Far Field -

                                         R t2        R f2
                                         R t2 = 167.04 m


                                         Beginning                       End
                                          S n. R n2                     S n. R n2
Transition Zone Power Density S
                                t1                             S t2
                                             R t1                         R t2

                                                     mw                           mw
                                  S t1 = 0.118                 S t2 = 0.049
                                                          2                            2
                                                     cm                           cm


Calculations at the Reflector Surface:                                 (Page 3 of 3)


                                         2
                                     D
Area of Reflector         A       π.
                                     2
                                             2
                          A = 4.524 m



                                        P
Power Density at the      S ref      2.
Reflector Surface                       A

                                                 mw
                          S ref = 0.088
                                                      2
                                                 cm




Calculations between the Antenna and the Ground:


Power Density between               P
                           S ga
Antenna and Ground                  A

                                                 mw
                           S ga = 0.044
                                                      2
                                                 cm



Conclusions

The power densities in the Near Field, Far Field, Transition Zone, at the
Surface of the Reflector, and between the Reflector and the Ground are all
below the allowable limit. Nowhere do they exceed the level of 5 mw/cm2
as listed in OET Bulletin No. 65. Thus, this transmit earth terminal meets
FCC requirements for human exposure to radio frequency energy.


                              EXHIBIT B                                     (Page 1 of 2)




               ENVIRONMENTAL IMPACT STATEMENT
                                 Transmit/Receive


In regard to Section 1.1307(a) of the Commission's rules:

This site is not in a designated wilderness area or wildlife preserve; it does not
threaten endangered species or critical habitats; nor does it affect sites,
structures, or habitats which are significant in American history, architecture,
archeology, engineering or culture that are listed or are eligible for listing in the
National Registry of Historic Places; it does not affect Indian religious sites or
flood plains; nor does it cause significant change in wetland fill, deforestation, or
water diversion.


In regard to section 1.1307(b) of the Commission's rules:

We have prepared the calculations of radio frequency radiation for this
transmitter and antenna combination, under the operating conditions specified in
this application, with these results:

Region                         Radiation level             Hazard assessment
                                (mw/cm2)
________                        ______________             _________________


Near field                       0.118                     Complies with guidelines

Far field                        0.050                     Complies with guidelines

Transition zone                  0.118                     Complies with guidance

At reflector surface             0.088                     Complies with guidance

Between the rim of the           0.044                     Complies with guidance
antenna and the ground


                                                                       (Page 2 of 2)


Conclusions: Based on the study, which is summarized above, we conclude that
in the regions of concern, the radiation level complies with the guidance; the level
is less than 5 milliwatts per square centimeter.

Accordingly, this action does not have a significant environmental impact as
described in the Commission's rules and does not require the preparation of an
environmental assessment.



Michael Kirk
(name)



Satellite Engineer
(title or position)



05/15/07
(date)


                                                                                                                                                           (Page 1 of 1)


                                                              EXHIBIT C
                                                          FAA INFORMATION

The proposed 2.4 meter Ku band R/T antenna, which is the subject of this application, is a fixed earth station that will be operated
on the roof of an existing building structure. The existing building structure is higher in elevation (exceeds the height) of the
proposed antenna. The maximum height of this antenna will be about 2.4 meters above one of the roof lines. Therefore since the
proposed antenna does not extend above the existing building structure, notice to the FAA is not required pursuant to Section 17.4
of the Commission‘s rules.




                                                                                                                               ~6.1meters/ 20feet _ J
                            Proposed 2.4m (~8 foot) antenna




                                                                                            |     203.91 meters/669feet yTTC——~~ 6.55 meters / 21.5 feet



Document Created: 2007-05-15 15:42:53
Document Modified: 2007-05-15 15:42:53

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