Compliance Letter

0263-EX-ST-2005 Text Documents

Globecomm Systems, Inc.

2005-05-16ELS_70822

May 10, 2005 GLOBECOMM Federal Communications Commission — International Bureau 445 12"" Street, S.W. Washington, D.C. 20554 Subject: GSI 0.75m Transportable Earth Station To Whom It May Concern: The Globecomm Systems Inc. Ku—band terminal will use one AvL Model 9066, temporary fixed antenna with a dimension of 90 x 66 cm (an equivalent aperture of 0.75 meter). The antenna pattern of the GSI 75cm Small Earth Station is non—compliant with the 29 — 25 log{O} specification between 1.25 degrees and 1.73 degrees angle off bore—sight. The 1.25 degree point is within the main beam of the 75cm antenna. Consequently, it will not be possible to reduce the power density enough so that the terminal will radiate an EIRP density of 15 dBW/4 kHz at the 1.25 degrees angle off bore—sight that would be the equivalent to a terminal using a compliant antenna. Our application to the FCC for an STA will be based on the calculation of the maximum EIRP density at the actual minimum angle off bore—sight (plus pointing error) to the next adjacent satellites. The antenna pattern is compliant with the 29 — 25 log{O} specification beyond 1.73 degrees angle off bore—sight. With the worst case pointing error is 0.3 degrees, this means the emissions would be within the implied limits beyond 2.03 degrees off bore—sight. Since the angle between adjacent satellites is always greater than the geocentric angle (see Attachment), the terminal will radiate an EIRP density in the direction of adjacent satellites that is equal to or less than the EIRP density radiated by a fully compliant antenna when both terminals limit the power density into the antenna to —14 dBW/4 kHz. By this analysis, the 75cm terminal will not cause interference to the adjacent satellite. Thus, we need only limit the power density to: —14 dBW / 4 kHz .Pointing angle difference between adjacent satellites with 2 degree spacing 'ery truly yours GLOBECOMM SYSTEMS INC. f,v'Donald G. Woodrmg . Viee.Presldent GLOBECOMM SYSTEMS INC. : ’ ISO 9001 CERTIFIED CORPORATE HEADQUARTERS: 45 OSER AVENUE ® HAUPPAUGE, NY 11788—3816 USA « TEL: +1 631 2319800 FAX: +1 631 23141557 email: info@globecommsystems.com « hitp://www.globecommsystems.com Offices: Hong Kong * United Kingdom

FCC—International Bureau May 10, 2005 Page 2 Pointing angle difference between adjacent satellites with 2 degree spacing Tampa 277.73 27.56 2.30 2.44 2.29 2.35 Washington 282.98 38.53 2.26 2.20 2.24 2.30 New York 285.99 40.43 2.25 2.19 2.23 2.28 ‘Atlanta 275.77 33.44 2.27 2.22 2.27 2.33 Washington 282.98 38.53 2.26 2.20 2.24 2.25 Minneapolis 266.85 44.58 2.21 2.16 2.23 2.27 Seattle 237.68 47.6 2.12 2.06 2.18 2.23 Los Angeles 241.86 34.03 2.17 2.11 2.24 2.30


Document Created: 2005-05-16 16:00:41
Document Modified: 2005-05-16 16:00:41
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