Supplement to SES-MO

SUPPLEMENT submitted by AT&T Corp.

Supplemental Letter

2019-04-03

This document pretains to SES-MOD-20180821-02252 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2018082102252_1643578

Daniel P. Brooks 202.719.4183 dbrooks@wileyrein.com VIA ELECTRONIC FILING April 3, 2019 Marlene H. Dortch Office of the Secretary Federal Communications Commission 445 12th Street, SW Washington, DC 20554 Re: AT&T Corp. Modification of Call Sign E980066 to Replace Antenna, Add Ku‐Band Frequencies, and Correct Geographic Coordinates, SES‐MOD‐20180821‐02252 Dear Ms. Dortch: AT&T Corp. (“AT&T”), by its undersigned counsel, respectfully submits this supplement to the above‐captioned earth station modification application, which seeks authority to add conventional Ku‐band and extended Ku‐band frequencies to the current authorization. Section 25.204(e)(2)1 and footnote US357 to the Table of Frequency Allocations2 specify certain conditions on earth stations transmitting in the 13.75‐14.00 GHz band. Specifically, the EIRP density must not exceed 71 dBW in any 6 MHz in the 13.77‐13.78 GHz band, and automatic power control may be used to increase the EIRP density in a 6 MHz band in the 13.77‐13.78 GHz band beyond the 71 dBW value provided that the power flux‐density at the satellite in that 6 MHz does not exceed the value that would be obtained from an emission at 71 dBW in clear‐ sky conditions. AT&T confirms that automatic power control will be used on the transmissions in this band and that the power control will be adjusted such that the clear‐sky EIRP density of any emission in any 6 MHz in the 13.77‐13.78 GHz band will not exceed 71 dBW. AT&T further confirms that the accuracy of the power control is such that, under faded conditions, the power flux density at the satellite in any 6 MHz in the 13.77‐13.78 GHz band will not exceed the value that would be obtained from an emission at 71 dBW in that 6 MHz in clear‐sky conditions. Please do not hesitate to contact the undersigned should you have any questions. 1 47 C.F.R. § 25.204(e)(2). 2 47 C.F.R. § 2.106, footnote US357. 1776 K Street NW | Washington, DC 20006 | 202.719.7000 wileyrein.com

Marlene H. Dortch, Secretary April 3, 2019 Page 2 Respectfully Submitted, /s/ Daniel P. Brooks Daniel P. Brooks Counsel for AT&T Corp. 1776 K Street NW | Washington, DC 20006 | 202.719.7000 wileyrein.com


Document Created: 2019-04-03 13:48:14
Document Modified: 2019-04-03 13:48:14
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