DRB1 Technical Supp

LETTER submitted by DIRECTV Enterprises, LLC

DRB1 Technical Support

2012-01-20

This document pretains to SAT-MOD-20111128-00230 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2011112800230_936069

January 20, 2012 BY ELECTRONIC FILING Marlene H. Dortch Secretary Federal Communications Commission 445 Twelfth Street, S.W. Washington, DC 20554 Re: IBFS File No. SAT-MOD-20111128-00230 Dear Ms. Dortch: At the request of the International Bureau staff, DIRECTV Enterprises, LLC (“DIRECTV”) hereby provides the following technical information to supplement its submission on the predicted transmitting antenna off-axis gain information for DIRECTV RB-1. As demonstrated in Table 1 below, the satellite will not exceed the -117 dBW/m2/100 kHz power flux-density (“PFD”) coordination trigger with respect to any DBS satellite located more than 0.07° away. Since DIRECTV RB-2 is licensed to operate at 99.175° W.L. and the nearest prior- filed U.S. DBS space station is DIRECTV 8, located at 100.85° W.L. (i.e., over 1.5° away, net of station keeping allowances), the spacecraft will not trigger the PFD threshold at any relevant location. Max EIRP from Sched S (dBW/36 MHz) 58 Peak TX Antenna gain from Sched S (dBi) 36.9 Max power into antenna (dBW/36 MHz) 21.1 Max power density into antenna (dBW/100 kHz) -4.5 Max off-axis predicted antenna gain (dBi) -7 Max off-axis EIRP density (dBW/100 kHz) -11.5 Coordination trigger value (dBW/m2/100 kHz) -117 Req’d spreading loss to meet coord trigger (dB-m2) 105.5 Req’d distance to achieve spreading loss (km) 53.4 Geocentric orbital separation equal to 53.4 km (deg) 0.07 Table 1. Orbital Separation Required to Meet Coordination Trigger In addition, this is to confirm that DIRECTV does not plan any orientation bias or change in operating orientation relative to the reference coordinate system for this spacecraft. See 47 C.F.R. § 25.264(a)(5).

WILTSHIRE & GRANNIS LLP Marlene H. Dortch January 20, 2012 Page 2 of 2 Should you have any questions, please do not hesitate to contact me. Respectfully submitted, /s/ William M. Wiltshire Counsel for DIRECTV cc: Diane Garfield


Document Created: 2012-01-20 14:21:09
Document Modified: 2012-01-20 14:21:09
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