Attachment EIRPINFO

This document pretains to SES-LIC-20050825-01183 for License on a Satellite Earth Station filing.

IBFS_SESLIC2005082501183_480494

WILMERHALE Josh L. Roland +1 202 663 6266 (t) +1 202 663 6363 (f) josh.roland@wilmerhale.com January 27, 2006 RECEIVED Ms. Marlene H. Dortch UAN _2 72006 Secretary Federal Communications Commission Federal Communications Commission 445 12th Street, S.W. Office of Secretary Washington, D.C. 20554 Re: IB File No. SES—LIC—20050825—01183 — Globalstar USA, LLC Clifton Earth Station/IOT Antenna Application Dear Ms. Dortch: In response to an inquiry from staff in the Commission‘s International Bureau, Globalstar USA, LLC is submitting the attached information for association with the above—referenced application. Should there be any questions concerning this submission, please contact the undersigned. Sincerely yours, @@« (2__ Josh L. Roland Counsel to Globalstar USA, LLC ce: Scott Kotler William F. Adler David Weinreich Wilmer Cutler Pickering Hale and Dorr ur, 2445 M Street, NW, Washington, DC 20037 Baitimore Beijing Bertin Boston Brussels London Munich New York Northern Virginia Oxford Palo Alto Waltham Washington

Justification of EIRP for Globalstar Clifton, TX In—Orbit—Test Antenna Globalstar wishes to perform In—Orbit Test (IOT) on existing and future spacecraft using an antenna operating in the 1.6/2.4 GHz bands at its Clifton Texas EHarth Station Facility. One of the primary tests to be performed is the determination and verification of spacecraft antenna patterns. Downlink, or spacecraft 2.4 GHz transmit, antenna verification requires the use of a high gain antenna which is accommodated by the receive function of the subject antenna. Uplink, or spacecraft 1.6 GHz receive, antenna verification requires the use of an unmodulated carrier (CW) at an EIRP greater than that transmitted from a Globalstar handset transceiver. This increased EIRP is required in order to create sufficient dynamic range to provide the ability to measure peak—to—null antenna pattern variations of 30 dB. The attached link budget indicates the Carrier—to— Noise ratio (C/N) expected when using an uplink EIRP of 24 dBwW. Using this EIRP provides the nominal 30 dB C/N. The performance of these In—Orbit—Tests will be crucial to the successful deployment of the eight spare Globalstar spacecraft that is planned for the near future. In the downlink analysis, it is expected that there will be no Adjacent Channel Interference and, thus, the Adjacent Channel Interference Density is an extremely low level. It is anticipated that any interference to other operators in the uplink band can be avoided through coordination. File No. SES—LIC—20050825—01183 January 26, 2006

IOT Link Analysis: 1.6 GHz Up/7 GHz Down Uplink Analysis Frequency (GHz) 1.61 EIRP (dBW) 24 Satellite Altitude (km) 1414 10T Antenna Elevation Angle (degrees) 5 Slant Range (km) 3959.44 Free Space Loss (dB) —168.53 Polarization and Tracking Loss (dB) —1 S/C Rx Signal Strength (dBW) —145.53 Satellite Antenna Gain (dBi) 12.6 Line Loss (dB) 111 Signal at Transponder (dBW) —134.03 System Noise Temperature (K) 500 Thermal Noise Density {dBW/Hz) —201.81 Adjacent Channel Interference Density (dBW/Hz) —214.2 IOT Measurement Bandwidth (dB—Hz) 34.77 Uplink C/N (dB) 32.58 Nominal Transponder Gain (dB) 125.9 Downlink Analysis Frequency (GHz) 6.98 Tx Power ({dBW) —~11.33 Transmit Line Loss {dB) —2.1 Satellite Antenna Gain (dBi) 6 EIRP {dBW) —7.43 Gateway Antenna Elevation Angle (degrees) 5 Range (km) . 3959.44 Free Space Loss (dB) —181.27 _|Polarization and Tracking Loss (dB) —0.1 Pointing Loss (dB) 1 Rx Signal Level (dBW) —189.80 Gateway Antenna Gain (incl. Line Loss) (dBi) 49.5 Rx Signal at Antenna Output (dBW) —140.30 System Noise Temperature (K) 127.7 Thermal Noise Density (dBW/Hz) —207.5 Adjacent Channel Interference Density (dBW/Hz) —999 Downlink C/N (dB) 32.46 Overall C/N (dB) 29.51 Required Measurement Dynamic Range (dB) 30 Worst Case Measurement C/N (dB) —0.49 Constants Earth Radius (km) 6398 c (m/S) 3.00E+08 degrees—to—radians 57.29577951


Document Created: 2006-01-31 11:25:56
Document Modified: 2006-01-31 11:25:56
© 2024 FCC.report
This site is not affiliated with or endorsed by the FCC