Technical Description

0117-EX-PL-2005 Text Documents

HNS License Sub, LLC

2005-04-19ELS_70253

ATTACHMENT 1 1. TECHNICAL DESCRIPTION OFKA—BAND ANTENNA TEST FACILITY Purpose The following sections describe a test facility for testing Spaceway prototype . antenna systems from various vendors. The purpose of this test facility is to validate antenna system performance under various conditions, including clear sky, pointing degradation, rain simulation, etc. A. _ Test Facility Description The test facility will be constructed on the property of Hughes Network Systems at its Germantown, Maryland headquarters location near the existing VSAT hub location. This test facility (see Figure 1.0) will consist of a 1.0 meter source antenna which will be located on . the ground behind the D building ofHNS. The geographical coordinates of this antenna location will be 39° 10° 50" North Latitude and 77° 14° 56" West Longitude. The test equipment for this antenna will be protected in the shelter located next to the antenna. This antenna will be used for transmitting a CW signalusing a signal generator HP $3650B with a maximum power of+5 dBm. The frequency of this signal will vary from 29.5 to 30.0 GHz for transmit tests and 19.7 to 20.2 GHz for receive tests. The maximum transmit EIRP will be approximately 23.0 dBW. The unit under test (UUT) will be located on the roof ofD building having a geographical coordinates of 39° 10‘ 47" North Latitude and 77° 14‘ 58" West Longitude. The antenna will be posmoned to enable a clear line of sight from the source antenna. The test equipmenitfor the receiving station (spectrum analyzerand power meter) will be protected in the building near the antenna. The distance between the source antenna and UUT antennawill beat least 657 feet in order tomake farfieldmeasurementsatthe highest test frequency of 30.0 GHz for antenna sizes up to 1.0 meter. Various antenna sizes from different vendors will be tested. P B. Interference to Other Services/Systems The requested test facility should not cause any interference to any services or systems. The particular Ka band frequencies requested are not allocated or licensed to terrestrial systems, so the earth station transmissions will not cause interference to any licensed terrestrial system. In addition, Hughes is not aware of any commercial or government satellite systems currently operating in this portion ofthe Ka band. In any event, the transmit earth station will be radiating at a very low EIRP of 23 dBW and at a very low elevation angle ofless than five degrees. This low transmit power should ensure that no interference is received by any unknown satellite systems that are operating in this portion Ka band. DC_DOCS\332333.3 [W97]

t5..sT eee —N oew msee ue on Puae drnes : bew stveremrmee cme td en wedke use me l s y ns C. RF Radiation Compliance The operation of this Ka BandTest Facility will be in full compliance with the Commission‘s radio frequency (RF) exposure guidelines, pursuant to Section 1.1307 (b) (1) through (b) (3) of the Commission‘s rules. Attachment 2 provides the radiation calculations, which demonstrate this compliance.

ATTACHMANT 2 . RADIATION CALCYULATNONS For 1.00 meter EARTH STATION t Nomenciature Formula VYalue Unit JNPUT PARAMETERS Ds Antennia Diameter 1.00 meters d — Diameter of Feed Mouth 0.051 meters p — Max Power into Antenna 9.010 Wwatts n = Apperture Effeciency 65% k = Wavelength @ 30 GHz 98.0100 meters ~ CALCULATED VALUES A = Area of Reflector [PDDO*214 0.78$ meters*2 } =Length of Near Field D*JAk 25 meters L = Beginning of Far Field 0.6D0*I/k 60 meters °G = Antenns Gain @30 GHtz n{PFPDk)*2 64.181 (48.1)¢0Bi a = Area of Feed Mouth P1°d"*24 1©.0020 meters*2 . POWER DENSITY CALCULATIONS Manrwm Power Densily in Region Region Hazard Assesamerft Formuta Value (Wim*2) (FCC MPE Limit = 1?_‘1:![:11‘2) 1 Near Field 4nPIA ©.03 <FCC MPE Limit 2 Far Field SPria{P)L2) 1.01 <FCC MPE Limit 3 Transition <= Nr Fid Region s.os <FCC MPE Limit 4 Near Refiector Suriace 4PIA ©.05 <FCC MPE Limit $ Between Refliector & Ground PIA 0.03 <FCC MPE Limit 6 Between Reflector and Faed 4Pla 19.6 Potential Hazard

| . | Sheltéer —p I uUi l | ;' & | Transm{t Antenna * 0C 1 ,= 1.0 meters | _‘ / 1,' . 88>, 5>foey ’ ; . m | > 1 Fix Antonna {UUT) D—Building Figure 1. Ka BandTest.Facility §


Document Created: 2004-07-30 19:05:02
Document Modified: 2004-07-30 19:05:02
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