Attachment Exhibit C

This document pretains to SES-LIC-20100126-00120 for License on a Satellite Earth Station filing.

IBFS_SESLIC2010012600120_796389

Exhibit C Galaxy Broadband Communications, Inc. Form 312 Application January 2010 Radiation Hazard Exhibit Galaxy Broadband Communications, Inc. (“Galaxy”) hereby applies to the Commission for authority to deploy via blanket licensing two types of VSAT remote terminals in the United States. This exhibit contains Galaxy’s radiation hazard exhibits in response to Question 28 on the FCC Form 312 application. Prodelin 1134 Antenna (1.2 meter) A radiation hazard analysis was done for a Prodelin 1.2 meter antenna and 2 Watts of power applied at the flange, using the methodology from OET Bulletin 65. The results of this analysis, which can be seen in Attachment 1 hereto, show that the maximum permissible 2 exposure limit (MPE) for protection of the general public of 1 mW/cm is met both in the far field, near field, transition zone and in the region between the reflector and the ground. 2 However, as is typical for all satellite antennas, the value of 1 mW/cm is exceeded in the volume of space between the feed horn and the reflector. This region is not usually accessible to the general public because the units are typically installed on rooftops. As a further protection mechanism, all VSAT terminals are equipped with an automatic shut-off mechanism which disables the transmitter should the receive signal be lost. This mechanism shuts the transmitter off within milliseconds should the receive carrier be blocked. This mechanism also ensures that a dish which has been accidentally re-pointed (e.g. during a storm) does not accidentally transmit towards an area occupied by the general public.

Prodelin 3981-226 Antenna (98 cm) A radiation hazard analysis was done for a Prodelin 98 cm antenna and 2 Watts of power applied at the flange, using the methodology from OET Bulletin 65. The results of this analysis, which can be seen in Attachment 2 hereto, show that the terminals meet the OET Bulletin 65 MPE levels in all regions except for the region between the feed horn and the reflector. This region will not be accessible to the general public because units are either installed on rooftops or elevated positions. The calculations from OET bulletin 65 estimate that the MPE level may also be exceeded near the reflector surface. This region also would not be accessible to the general public because units are installed on rooftops or elevated positions and positioned in order that clear full time line-of-site access to the spacecraft is ensured. In addition, Galaxy does not believe that it would be possible for a human obstruction, outside the region between the feed horn and the reflector, to cause sufficient blockage to result in significant increased transmit power from the terminal. Also, it is highly improbable that any terminal will transmit sufficient power to exceed the MPE in the near field and transition field area continuously for a 30 minute period, which is the time associated with the MPE of OET Bulletin 65. Therefore, there is no issue associated with human exposure to radiation from this terminal. Nonetheless, as a further protection mechanism, all VSAT terminals are equipped with an automatic shut-off mechanism which disables the transmitter should the receive signal be lost. This mechanism shuts the transmitter off within milliseconds should the receive carrier be blocked. This mechanism also ensures that a dish which has been accidentally re-pointed (e.g. during a storm) does not accidentally transmit towards an area occupied by the general public 2

Exhibit C, Attachment 1 Galaxy Broadband Communications, Inc. January 2010 RADIATION CALCULATIONS FOR 1.20 meter EARTH STATION Nomenclature Formula Value Unit INPUT PARAMETERS M = Antenna Aperture Major Axis 1.20 meters m = Antenna Aperture Minor Axis 1.20 meters d = Diameter of Feed Mouth 0.133 Meters f = frequency 14.25 GHz P = Max Power into Antenna 2.0 Watts n = Aperture Efficiency 63% k = Wavelength @ 14.25 GHz 0.0210 meters CALCULATED VALUES A = Area of Reflector PIxMxm/4 1.131 meters^2 l = Length of Near Field M^2/4k 17 meters L = Beginning of Far Field 0.6M^2/k 41 meters G = Antenna Gain @ 14.25 GHz n(4xPIxA)/k^2 20,230 (43.1) dBi a = Area of Feed Mouth PI*d^2/4 0.0139 meters^2 POWER DENSITY CALCULATIONS Maximum Power Density in Region Region Hazard Assessment (FCC MPE Limit = 1 Formula Value (mW/cm^2) mW/cm^2) 1 Near Field 4nP/A 0.45 < FCC MPE Limit 2 Far Field GP/(4(PI)L^2) 0.19 < FCC MPE Limit <= Nr Fld 3 Transition Region 0.45 < FCC MPE Limit 4 Near Reflector Surface 4P/A 0.71 < FCC MPE Limit 5 Between Reflector & Ground P/A 0.18 < FCC MPE Limit 6 Between Reflector and > FCC MPE Limit (See Feed 4P/a 57.6 Exhibit C)

Exhibit C, Attachment 2 Galaxy Broadband Communications, Inc. January 2010 RADIATION CALCULATIONS FOR 0.98 meter EARTH STATION Nomenclature Formula Value Unit INPUT PARAMETERS M = Antenna Aperture Major Axis 0.98 meters m = Antenna Aperture Minor Axis 0.98 meters d = Diameter of Feed Mouth 0.133 Meters f = frequency 14.25 GHz P = Max Power into Antenna 2.0 Watts n = Aperture Efficiency 63% k = Wavelength @ 14.25 GHz 0.0210 meters CALCULATED VALUES A = Area of Reflector PIxMxm/4 .754 meters^2 l = Length of Near Field M^2/4k 11 Meters L = Beginning of Far Field 0.6M^2/k 27 Meters G = Antenna Gain @ 14.25 GHz n(4xPIxA)/k^2 13,492 (43.1) dBi a = Area of Feed Mouth PI*d^2/4 0.0139 meters^2 POWER DENSITY CALCULATIONS Maximum Power Density in Region Region Hazard Assessment Value Formula (mW/cm^2) (FCC MPE Limit = 1 mW/cm^2) 1 Near Field 4nP/A 0.67 < FCC MPE Limit 2 Far Field GP/(4(PI)L^2) 0.29 < FCC MPE Limit <= Nr Fld 3 Transition Region 0.67 < FCC MPE Limit 4 Near Reflector Surface 4P/A 1.06 > FCC MPE Limit (See Exhibit C) 5 Between Reflector & Ground P/A 0.27 < FCC MPE Limit 6 Between Reflector and Feed 4P/a 57.6 > FCC MPE Limit (See Exhibit C)


Document Created: 2010-01-26 14:13:31
Document Modified: 2010-01-26 14:13:31
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