Attachment Exhibit B

This document pretains to SES-MOD-20131125-01162 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2013112501162_1028633

Exhibit B Response to Question 28 This attachment analyzes the power-flux density near the proposed transmit antenna. The antenna will be a parabolic 0.84 m antenna with a transmit gain of 20.6 dBi. The site will transmit a peak EIRP of 16.5 dBW. The power-flux density calculations in this exhibit are based on this peak EIRP value. These calculations follow the methodology outlined in OET Bulletin No. 65, “Evaluating Compliance with FCC-Specified Guidelines for Human Exposure to Radiofrequency Radiation.” The power-flux density calculations are made for a transmitting frequency of 1631.5 MHz. At this frequency, the maximum permissible exposure to RF fields in a controlled environment is 5 mW/cm2. Far Field Calculations The distance to the beginning of the far field, Df, for a circular aperture antenna is given by Equation 16 of OET Bulletin 65: Df = (0.6 D2) / λ For an antenna size of 0.84 m, the far field distance is 2.2 m. The maximum power-flux density in the far field is given by Equation 4 of OET Bulletin 65: Pd = EIRP / (4π Df2) For a 0.84 m antenna, the maximum power-flux density in the far field is 0.7 mW/cm2. Near Field Calculations The maximum power-flux density for the near field, Pd(nf) is given by Equation 13 of OET Bulletin 65: Pd(nf) = 16 ηPRF / (π D2) where PRF = RF power input to the antenna D = antenna diameter η = aperture efficiency (60% used) For a 0.84 m antenna, the maximum power-flux density in the near field is 0.17 mW/cm2. Conclusion This site is in a controlled environment. The general public does not have access to the site where the transmit antenna is located. The maximum permissible exposure to RF fields in a controlled environment is 5 mW/cm2 at the L band. The calculations show that the site will not exceed the permissible levels for exposure to RF radiation.


Document Created: 2013-11-22 11:49:10
Document Modified: 2013-11-22 11:49:10
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