Attachment letter

letter

LETTER

letter

2006-06-05

This document pretains to SAT-MOD-20060501-00052 for Modification on a Satellite Space Stations filing.

IBFS_SATMOD2006050100052_504787

C pifisbu{y : 2300 N Street, N.W. Tel 202.663.8000 7 3t Washington, D.C. 20037—1128 Fax 202.663.8007 Wlfith“}p . asnmgion w?w.giflsbu;ylaw.com Shaw Pittman. June 5, 2006 " David Konczal 202—663—8432 david.konczal@pillsburylaw.com Via Hand Delivery Ms. Marlene H. Dortch Secretary Federal Communications Commission 445 12th Street, S.W. Washington, D.C. 20554 Re: XM Radio Inc. Application for Modification of Space Station License for XM—1 File No. SAT—MOD—20060501—00052 Dear Ms. Dortch: On May 1, 2006, XM Radio‘Inc. ("XM") filed the above—captioned request to modify the license for its XM—1 satellite to specify operation at the 85.20°W.L. orbital location. See File No. SAT—MOD—20060501—00052. Page 2 of the Technical Appendix to this application, under the heading "Interference Analysis," incorrectly stated that a 0.2 degree change in the orbital location of XM—1 from 85°W.L. to §5.20°W.L. would result in a worst—case interference increase of about 0.5 dB for a hypothetical satellite operating at 87.00°W.L. assuming the earth station antenna axis is repointed 0.2 degree west. Attached hereto is an amended paragraph which correctly states that the worst—case interference increase would be 1.1 dB, not 0.5 dB as previously indicated. Please contact the undersigned with any questions. Very truly yours, <[x _ David S. Konczal co: Stephen Duall Shabnam Javid

— Interference Analysis. Other than XM—3 at 85.10°W.L., there are no satellites using either S—band or X—band frequencies within 2 degrees of the 85.20°W .L. orbital location. XM does not share S—band spectrum with other satellite systems, thus the precise location of the satellite has no impact on interference among the systems. ~ In the X—band, the signal transmitted from XM‘s feeder link earth station site in Washington, DC depends on the characteristics of that station‘s antenna. At worst, the gain roll— off of that antenna is bounded by 29—25log(0). Assuming a hypothetical X—band satellite operating at 87.00°W.L., a 0.20° change in the orbital location of XM—1 from 85°W .L. to satellite operating at 87.00°W.L. assuming the earth station antenna axis is repointed 0.2 degree west.

Techaical Certification I, Jeffrey S. Snyder, Senior Vice President, Space Systems, of XM Radio Inc., certify under penalty of perjury that: I am the technically qualified person with overall responsibility for preparation of the technical information contained in the foregoing. I am familiar with the requirements ofPart 25 ofthe Commission‘s rules, and the information contained in the application is true and correct to the best ofmy knowledge and belief. y S./Snyder Dated: June 5 2006


Document Created: 2006-06-09 12:01:23
Document Modified: 2006-06-09 12:01:23
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