Attachment Rad Haz Study

This document pretains to SES-MOD-20170413-00388 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017041300388_1205430

Iridium Satellite LLC                                                          Exhibit 1
                                                                           FCC Form 312


                         RADIATION HAZARD STATEMENT



The Maximum Permissible Exposure (MPE) for this mobile earth station at a distance of
0.3 meters is calculated as follows:

S = EIRP/4πR2

Where         S = Power Density (Watts/m2)
              EIRP =Radiated Power (Watts)
              R = Distance from body (m)


EIRP = maximum EIRP * duty cycle


Max EIRP = 27.7 dBW = 588.8 watts (two carriers each operating at max EIRP)
Duty cycle = 4 time slots * 8.28 ms per transmission / 90 ms per frame = 0.368
EIRP = 588.8* 0.368 = 216.7 watts


S = 216.7/(4π *0.3 *0.3) = 191.6 Watts/m2


The minimum separation distance from the terminal to ensure that the power density is
below the 10 Watts/m2 requirement is calculated as:


R = (EIRP/4πS)1/2 = (216.7/4π10)1/2 = 1.3 meters


At 1.3m the power density is less than the 10 Watts/m2 requirement for the general
population/uncontrolled exposure.


The installation/user manual specifies a 2m minimum spacing between the Iridium
Certus antenna and the general public. Further, there is a warning on the device itself
showing the minimum 2m separation distance.



Document Created: 2017-04-13 11:47:10
Document Modified: 2017-04-13 11:47:10

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