06-22-10 Letter Supp

LETTER submitted by SkyTerra Subsidiary LLC

Letter

2010-06-22

This document pretains to SAT-MOD-20090529-00063 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2009052900063_823825

Pillsbury Winthrop Shaw Pittman LLP 2300 N Street, NW | Washington, DC 20037-1122 | tel 202.663.8000 | fax 202.663.8007 Tony Lin Phone: 202.663.8452 tony.lin@pillsburylaw.com June 22, 2010 By Electronic Filing (IBFS) Marlene H. Dortch Federal Communications Commission 445 12th Street, S.W. Washington, D.C. 20554 Re: SkyTerra Subsidiary LLC File No. SAT-MOD-20090529-00063 Dear Ms. Dortch: At the International Bureau’s request, SkyTerra Subsidiary LLC hereby files this letter to clarify alleged discrepancies regarding the cross-polarization isolation values stated in the Schedule S and the Technical Exhibit of the above-referenced application. The 25 dB “Min. Cross-Polar Isolation” value specified in column “g” of Table S7 of the Schedule S form is the satellite antenna cross-polarization isolation specification value for each of the four Ku-band feederlink beams. The “C/I (Crosspolarization)” value stated in the link budgets is the calculated (not specified) carrier-to-noise power ratio derived from the Cross-Polar isolation, as well as other link parameters. In other words, the “C/I (Crosspolarization)” is an effect of, and not the same as, the satellite “Min. Cross-Polar Isolation.” For example, in calculating link budgets, SkyTerra considered not only the individual beam cross-polarization isolation value but also the impact of the cross-polarized signals from all feederlink beams to determine an aggregate carrier-to-interference ratio (C/I). Thus, the link budgets in the Technical Exhibit state the “C/I (Crosspolarization)” values as 23 dB in the GMSA cases and 24 dB in the GMR-3G cases. Please direct any questions concerning this letter to the undersigned. www.pillsburylaw.com

Very truly yours, /s/ Bruce D. Jacobs Tony Lin Counsel for SkyTerra Subsidiary LLC cc: (by email) Kathyrn Medley Bill Bell Sylvia Lam www.pillsburylaw.com 402083566v2


Document Created: 2010-06-22 14:52:45
Document Modified: 2010-06-22 14:52:45
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