Attachment Rad Haz Study

This document pretains to SES-MOD-20170413-00389 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2017041300389_1205431

Iridium Carrier Services 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 11:50:07
Document Modified: 2017-04-13 11:50:07
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