Attachment supplement

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

IBFS_SATAMD2004020900014_376146

ShawPittman LLP A Limited Liability ParinmPrshipIncluding Professional Corporations Pottcy Branch internationalBureau RECEIVED May 24,2004 [MAY 2 4 2004 Via Hand Delivery Ms. Marlene H. Dortch Secretary Federal Communications Commission 445 12th Street, S.W. Washington, D.C. 20554 Re: Mobile Satellite Ventures Subsidiary LLC File No. SAT-AMD-20040209-00014 (replacement satellite application) File No. SAT-AMD-20031118-00335 (replacement satellite application) Dear Ms. Dortch: On April 23,2004, the International Bureau (“Bureau”) informed Mobile Satellite Ventures Subsidiary LLC (“MSV”) that the two-degree spacing analysis required by Section 25.140(b)(2) of the Commission’s rules to accompany applications for Fixed Satellite Service (“FSS”) satellites is also required to be submitted with MSV’s above-captioned application for a replacement Mobile Satellite Service (“MSS”) satellite that will use Planned Ku-band frequencies for feeder links.’ The letter directed MSV to supplement its pending replacement application with this analysis by May 24,2004. In compliance with the Bureau’s request, MSV hereby files this supplement to its pending replacement application to include the two-degree spacing analysis. ’See Letter from Robert G. Nelson, FCC, to Lon C. Levin, MSV, File No. SAT-AMD- 2003 11 18-00335 (April 23,2004). At the same time as it requested the additional information, the Bureau also dismissed MSV’s February 9,2004 amendment to its pending MSS replacement application for failing to include this analysis. See MSV, Amendment, File No. SAT-AMD- 20090209-00014 (filed February 9,2004); Letter from Thomas Tycz, FCC, to Lon C. Levin, MSV, File No. SAT-AMD-20040209-00015, DA 04-1095 (April 23,2004). MSV is filing today for reconsideration of that decision. Submission of this interference analysis is not a concession by MSV that an interference analysis was required. Washington, DC Northern Virginia New York Los Angeles 2300 N Street, NW Washington, DC 20037- 1 1 28 202.663.8000 Fax: 202.663.8007 w ww.sho wpittrnm.com London -~ -~

Ms. Marlene H. Dortch May 24,2004 Page 2 Please direct any questions regarding this matter to the undersigned. Very truly yours, & -dm David S. Konczal CC: Robert Nelson

MSV-1 Two-degree Spacing Interference Analysis The MSV feederlinks will operate in the Ku-band frequencies defined in Appendix 30B of the ITU Radio Regulations. In the Appendix 30B plan, the nearest satellite longitudes to 101"W are 104"W (Ecuador) and 98.2"W (Aruba). The only satellite within 10" with ITU filings is MSAT-1 (Canada) at 106.5"W. The Canadian allocation at 106.5"W is the nearest one that has been brought into use. Thus, no satellites operate 2" away from 101"W. Therefore, the interference analysis has been performed assuming that a satellite with Ku-band carrier and antenna parameters identical to those of MSV-1 operates at 99"W. To broaden the applicability of the analysis, parameters from the pending Boeing and Iridium applications at 120"W and 87.5"W, respectively, have been included in the analysis.' Both Boeing and Iridium satellites are widely separated from MSV-1, but for the purpose of the analysis they will be considered to be located 2" away from 101"W. All MSV-1, Boeing, and Iridium carriers are digital. Carriers and Feederlink Earth Station Characteristics The carriers and Earth station characteristics defined in the MSV, Boeing, and Iridium filings are shown in Table 1. Since per user rather than per carrier values were provided for the Boeing and Iridium networks, and several carrier bandwidths are used, C/I calculations will be performed based on carrier densities. Table 1 MSV, Boeing, and Iridium Carriers Network MSV MSV MSV MSV MSV Boeing' Iridium' Position deg. W.L. 101 101 101 101 101 120 87.5 Carrier WCDMA cdma2000 GMR MSAT MSAT Data cdma2000 cdma2000 Voice Ku Band Uplink ElRP 71.7 66.7 61.O 46.7 40.0 29.3 29.3 per carrier (dBW) Uplink BW (kHz) 5000 1250 200 4.8 1.2 9.6 9.6 Uplink ElRP Density dBWlHz 4.7 5.8 8.0 9.9 9.2 -10.4 -10.4 Ku Band 34.5 34.7 20.5 1.7 -10.3 10 10 Downlink ElRP (dBW) Downlink BW (kHz) 5000 1250 50 4.8 1.2 4.8 4.8 Downlink ElRP Density -32.5 -26.2 -26.5 -35.1 -41.1 -26.8 -26.8 dBWlHz * Boeing and Iridium characteristics were provided on a per-user rather than per-carrier basis I Relevant feederlink earth station characteristics are shown in Table 2. Side lobe antenna gain is calculated using an angle of 2.2" because that is the Topocentric angle corresponding to 2" orbital separation. IIridium, Application for Modification, File No. SAT-MOD-20030828-00286 (August 28,2003); Boeing, Amendment, File No. SAT-AMD-20030827-00241 (August 27, 2003).

2 Table 2 - Feederlink Earth Station Antenna Characteristics. MSV Boeing iridium Antenna Transmit Gain (dBi) 61.1 57.9 61.7 Side lobe Pattern 29-25LOgO 27-251090 27-251Og() Side lobe Gain @ 2.2” Topocentric 20.4 18.4 18.4 Separation Delta Gain Main Side Lobe (dB) 40.7 39.5 43.3 Antenna Receive Gain (dBi) 60.1 56.6 60.2 Side lobe Pattern 29-25~0g(e) 27-25~0g(e) 2 7 - ~ 5 ~ 0 g ( e ) Side lobe Gain @ 2.2” Topocentric 20.4 18.4 18.4 Separation Delta Gain Main Side Lobe (dB) 39.7 38.2 41.a Uplink Analysis Table 3 shows the results of the uplink C/I calculations for all pair-wise combinations of carriers and networks, The C/I values are calculated using the equation: c/I”p = covup- CoIup + AGtI Where: C/Iup= Uplink carrier to interference ratio of the victim carrier caused by the interfering carrier Covup= EIRP density of the victim carrier toward the victim satellite Co~up= EIRP density of the interfering carrier in the main lobe of its transmitting antenna AGtl = Difference in gain between the main lobe interfering antenna gain and the gain toward the victim satellite.

Table 3 - Uplink Interference Calculation Results Victim CII Values (dB) From the Table 3, all carrier combinations result in very low interference. The worst case C/I is 19.2 dB, which corresponds to a ATIT value of 1.2%, well below the coordination threshold value. Downlink Analysis Table 4 shows the results of the downlink C/I calculations for all pair-wise combinations of carriers and networks. The C/I values are calculated using the equation: where: C/bow = Downlink carrier to interference ratio of the victim carrier caused by the interfering carrier CoVdown = EIRP density of the victim satellite carrier toward its earth station CoIdown = EIRP density of the interfering satellite carrier toward the victim earth station AGtl = Difference in gain between the main lobe victim antenna gain and the gain toward the interfering satellite.

4 Table 4 - Downlink Interference Calculation Results Victim CII Values Iridium I 36.0 I 42.3 I 42.1 I 33.4 I 27.5 I 41.8 I 41.8 From the Table 4, all carrier combinations result in very low downlink interference. The worst case C/I is 19.2 dB, which corresponds to a AT/T value of 0.33%, well below the coordination threshold value of 6%..

ID :7033902778 MFlY 2 4 ’ 0 4 1 3 : 1 1 No.004 P.02 MOTIENTJ’MSU CEHTIFICATION I, Richard 0.Evans, Senior Engincer of Mobile Satellite Ventures Subsidiary LLC (“MSV”), rxrtify under penalty of perjury that: I am the technically qualified person with overall responsibility for preparation of the information contained in the foregoing. I am familiar with the requirements of the Commission’s rules, and the information contained therein is true and correct. Executed on May 24,2004 kLU0. Richard 0. Evans Scnior Engineer


Document Created: 2004-06-01 11:37:15
Document Modified: 2004-06-01 11:37:15
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