Attachment letter

This document pretains to SAT-AMD-20040209-00014 for Amended Filing on a Satellite Space Stations filing.

IBFS_SATAMD2004020900014_376157

EX PARTE OR LATE FILED Mo biI e Sat e I I it e Ventures ORIGINAL May 12,2004 Via Hand Delivery RECEIVED Ms. Marlene H. Dortch Secretary Federal Communications Commission 445 12th Street, S.W. Washington, D.C. 20554 Re: Mobile Satellite Ventures Subsidiary LLC Ex Parte Presentation File No. SAT-AMD-20040209-00014 File No. SAT-AMD-20031118-00335 Dear Ms. Dortch: Mobile Satellite Ventures Subsidiary LLC (“MSV”) files this letter to clarify that its replacement Mobile Satellite Service (“MSS”) satellite at 101“W will satisfy an emission limit of -160 dBW/m2into the 10.6-10.7 GHz band to protect radio astronomy from harmful interference. MSV has applied to operate its replacement satellite using the following downlink frequencies for feeder link operations: 10.70-10.95 & 11.2-11.45 GHz.’ This band lies immediately adjacent to the 10.6-10.7 GHz band which is allocated to radio astronomy on a primary basis. 47 C.F.R. 5 2.106, US277. US21 1 urges space stations operating in the 10.7-11.7 GHz band to protect radio astronomy observations in the adjacent band from harmful interference. 47 C.F.R. 4 2.106, US2 11? ’See Mobile Satellite Ventures Subsidiary LLC, Amendment, File No. SAT-AMD-20040209- 00014 (February 9,2004); Mobile Satellite Ventures Subsidiary LLC, Minor Amendment, File No. SAT-AMD-20031118-00335 (November 18,2003). On April 23,2004, the International Bureau dismissed MSV’s February 9,2004 amendment in which MSV requested authority to operate in the 10.70-10.75 GHz band because it purportedly failed to include an interference analysis. See Letter from Thomas S. Tycz, FCC, to Lon C. Levin, MSV, File No. SAT-AMD- 20040209-00014, DA 04-1095 (April 23,2004). This amendment will be reinstated if the International Bureau’s decision is reversed on review. 2 US74 further clarifies that in the 10.68-10.7 GHz band, radio astronomy service is “protected from extraband radiation only to the extent that such radiation exceeds the level which would be present if the offending station were operating in compliance with the technical standards or criteria applicable to the service in which it operates.” 47 C.F.R. 5 2.106, US74. ---------_ Mobile Satellite Ventures LP 10802 Parkridge Boulevard, Reston, Virginia, 201 91 -541 6

MA. Marlene H. Dortch May 12,2004 Page 2 The National Science Foundation has explained that the protection level required at radio astronomy sites in the 10.6-10.7 GHz band is -160 dBW/m2. MSV certifies that emissions from its replacement satellite will not exceed this emission limit in the 10.6-10.7 GHz band. As with its current satellite, AMSC-1, MSV will equip its replacement satellite with a special transmitter output filter to limit emissions in the 10.6-10.7 GHz band at or below this level to ensure that radio astronomy observations are protected from harmful interference. Please direct any questions regarding this matter to the undersigned. Very truly yours, -~ Lon C. Levin cc: Karl Nebbia, National Telecommunication and Information Administration Tomas E. Gergely, National Science Foundation Thomas Tycz, FCC Document #: 140 17 17 v. 1


Document Created: 2004-06-01 12:01:58
Document Modified: 2004-06-01 12:01:58
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