Attachment Radiation Hazard

This document pretains to SES-STA-20140502-00329 for Special Temporal Authority on a Satellite Earth Station filing.

IBFS_SESSTA2014050200329_1044796

                    ANALYSIS OF NON-IONIZING RADIATION
                       for Pacific Television Center
                         Site: Various State: NA
             Latitude: 0 0 0.0 Longitude: 0 0 0.0 (NAD83)
                                05-01-2014

The Office of Science and Technology Bulletin, No. 65, October
1985 and revised August 1997, specifies that the maximum level
of non-ionizing radiation that a person may be exposed to over a
six minute period is an average power density equal to 5 mW/cm**2
(five milliwatts per centimeter squared) for a controlled
environment. For an uncontrolled environment, the maximum level
of non-ionizing radiation that a person may be exposed to over a
thirty minute period is an average power density equal to 1 mW/cm**2
(one milliwatt per centimeter squared). It is the purpose of this
report to determine the maximum power flux densities of the earth
station in the far zone, near zone, transition zone, at the main
reflector surface, and between the antenna edge and the ground.


Parameters which were used in the calculations:
===============================================

Antenna Diameter,                (D) = 1.0000 m

Antenna Surface Area           (Sa) =    pi(D**2)/4        = 0.7854 m**2

Wavelength at 14.1200 GHz    (lambda) = 0.0212 m

Transmit Power at Flange         (P) = 56.1600 Watts

Antenna Gain at Earth Site     (GES) = 41.5000 dBi     =     14125.3754
                                                                Power Ratio:
                                                               AntiLog(GES/10)
pi                                   =    3.1415927

Antenna Aperture Efficiency      (n) = 0.6500


1. FAR ZONE CALCULATIONS
========================

Distance to the Far Zone     (Df) =    (n)(D**2)     = 30.6604 m
                                       ---------
                                        lambda


Far Zone Power Density       (Rf) =     (GES)(P)     = 67.1525 W/m**2
                                      ------------
                                      4*pi*(Df**2)
                                                     = 6.7153 mW/cm**2




2. NEAR ZONE CALCULATIONS
=========================

Power Flux Density is considered to be at a maximum value
throughout the entire length of this Zone. The Zone is
contained within a cylindrical volume which has the same diameter
as the antenna. Beyond the Near Zone, the Power Flux Density
will decrease with distance from the Antenna.

Distance to the Near Zone    (Dn) =      D**2        = 11.7925 m
                                       --------
                                       4*lambda


Near Zone Power Density      (Rn) =    16.0(n)P      = 185.9133 W/m**2
                                       --------
                                       pi(D**2)

                                                     = 18.5913 mW/cm**2




3. TRANSITION ZONE CALCULATIONS
===============================

The Power Density begins to decrease with distance in the
Transition Zone. While the Power Density decreases inversely with
distance in the Transition Zone, the Power Density decreases
inversely with the square of the distance in the Far Zone.
Since the maximum Power Density in the Transition Zone will not
exceed the Near Zone values, it is not calculated.


4. MAIN REFLECTOR ZONE
======================

Main Reflector Power Density       =       2(P)      = 143.0103 W/m**2
                                           ----
                                            Sa
                                                     = 14.3010 mW/cm**2




5. ZONE BETWEEN THE MAIN REFLECTOR AND THE GROUND
=================================================

Applying uniform illumination of the Main Reflector Surface:

Main to Ground Power Density       =         P       = 71.5051 W/m**2
                                            ----
                                             Sa
                                                     = 7.1505 mW/cm**2


                    CALCULATED SAFETY MARGINS SUMMARY
                              AND EVALUATION

--------------------------------------------------------------------------
  Controlled Safety Margin = 5.0 - Calculated Zone Value (mW/cm**2)
--------------------------------------------------------------------------

                                  Safety
     Zones                        Margins      Conclusions
                                 (mW/cm**2)
----------------------------    ------------   ----------------------------
1. Far Zone                         -1.7153    POTENTIALLY HAZARDOUS

2.   Near Zone                     -13.5913    POTENTIALLY HAZARDOUS

3.   Transition Zone            Rf < Rt < Rn   Complies with ANSI

4.   Main Reflector Surface         -9.3010    POTENTIALLY HAZARDOUS

5.   Main Reflector to Ground       -2.1505    POTENTIALLY HAZARDOUS



--------------------------------------------------------------------------
  Uncontrolled Safety Margin = 1.0 - Calculated Zone Value (mW/cm**2)
--------------------------------------------------------------------------

                                  Safety
     Zones                        Margins      Conclusions
                                 (mW/cm**2)
----------------------------    ------------   ----------------------------
1. Far Zone                         -5.7153    POTENTIALLY HAZARDOUS

2.   Near Zone                     -17.5913    POTENTIALLY HAZARDOUS

3.   Transition Zone            Rf < Rt < Rn   Complies with ANSI

4.   Main Reflector Surface        -13.3010    POTENTIALLY HAZARDOUS

5.   Main Reflector to Ground       -6.1505    POTENTIALLY HAZARDOUS




6. EVALUATION
==============

A. Controlled Environment
The FAR ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.

The NEAR ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while


the system is in use.   Additionally, the system will be shut down for
servicing.

The MAIN Reflector Surface ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.

The MAIN Reflector to GROUND ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.

B. Uncontrolled Environment
The FAR ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.

The NEAR ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.

The MAIN Reflector Surface ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.

The MAIN Reflector to GROUND ZONE does not comply with the ANSI standards!
WARNING SIGNS will be posted for the affected Zone indicating danger while
the system is in use. Additionally, the system will be shut down for
servicing.



Document Created: 2014-05-01 15:00:35
Document Modified: 2014-05-01 15:00:35

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