Attachment Supplement

Supplement

LETTER submitted by Mobile Satellite Ventures Subsidiary LLC

Supplement information to add ATC

2005-11-17

This document pretains to SES-MOD-20051110-01561 for Modification on a Satellite Earth Station filing.

IBFS_SESMOD2005111001561_467295

fls 2300 N Street, N.W. Tel —202.663.8000 ?‘%%%i}@@f Washington, D.C. 20037—1128 Fax 202.663.8007 W%fi??é%’%g} www.pilisburylaw.com Shaw Pittman. November 17, 2005 Bruce D. Jacobs 202—663—8077 bruce.jacobs@pillsburylaw.com 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 Application for Modification of License to Operate ATC File No. SAT—MOD—20051104—00212 File No. SAT—MOD—20051104—00211 File No. SES—MOD—20051110—01561 Dear Ms. Dortch: On November 15, 2005, Peter Karabinis, Senior Vice President and Chief Technical Officer of Mobile Satellite Ventures Subsidiary LLC ("MSV"); and Bruce Jacobs and David Konczal of Pillsbury Winthrop Shaw Pittman LLP, counsel for MSV; met with William Bell, Richard Engleman, Howard Griboff, Andrea Kelly, Karl Kensinger, Scott Kottler, Kathyrn Medley, Robert Nelson, and Sean O‘More of the International Bureau regarding MSV‘s above—referenced application for modification of its license to operate an Ancillary Terrestrial Component ("ATC"). In addition to discussing the document attached hereto, MSV elaborated on the public interest benefits of the waivers it is seeking, which are discussed on pages 9—11 of the Technical Appendix of the application. Among other things, the requested base station waivers will minimize the cost and complexity of deploying an ATC network, meaning ATC can be deployed more expeditiously and at less cost. The requested waiver pertaining to the EIRP of user devices will afford MSV additional flexibility that is important to offering new and innovative services. Please direct any questions regarding this matter to the undersigned. Very truly yours, f.. D %zm Bruce D. Jacobs

Ms. Marlene H. Dortch November 17, 2005 Page 2 co: William Bell Richard Engleman Howard Griboff Andrea Kelly Karl Kensinger Scott Kottler Kathyrn Medley Robert Nelson Sean O‘More

MSV‘s APPLICATION FOR MODIFICATION OF AUTHORITY TO OPERATE AN ANCILLARY TERRESTRIAL COMPONENT Fundamental Relationship Let P ; and B; denote the EIRP (Watts) and the bandwidth (Hz) of a carrier, respectively, of a first protocol (e.g., GSM). The EIRP spectral density (i.e., the equivalent isotropic radiated power spectral density, "PSD") of the carrier may be expressed as: 10*log (P1/B;) = 10*log (P;) — 10*log (B;); dBW/Hz (1) Let P; and B; denote the EIRP (Watts) and the bandwidth (Hz) of a carrier, respectively, of a second protocol (e.g., cdma2000). The EIRP spectral density associated with M second carriers, each radiating the same EIRP, P;, can be expressed as: 10*log [M*(Py/B;)] = 10*log (M) + 10*log (P;) — 10*log (B;); dBW/Hz _ (2) Equating equation (1) to equation (2) and solving for M; we find: p — 1 o[10tes (P1) — 10*log (P;) + 10*log (B,) — 10*log (B 4 )10 3) Application: Let us assume that 10*log (P;)= 0 dBW and 10*log (B;) = 53 dBHz as may be the case for a GSM return link carrier (200 kHz bandwidth and EIRP = 1 Watt). For a second protocol let us assume 10*log (P;) = —6 dBW (i.e., EIRP = 0.25 Watts) and a carrier bandwidth of 1.25 MHz; that is, 10*log (B;) = 61 dBHz, as may be the case for a return link cdma2000 carrier radiating one code. Substituting these values into equation (3) above we find: M = 100 +6+ 61— 53119 = 1 p[141/10 _ 95 This means that the PSD potential that may be generated by a fully—loaded return link GSM carrier (all eight time slots loaded) is indistinguishable from the PSD potential that may be generated by 25 cdma2000 return link carriers each radiating one code or by one cdma2000 return link carrier radiating 25 codes (each at —6 dBW EIRP).


Document Created: 2005-11-29 12:38:19
Document Modified: 2005-11-29 12:38:19
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