Attachment Technical Data exhib

This document pretains to SES-LIC-19960116-01967 for License on a Satellite Earth Station filing.

IBFS_SESLIC1996011601967_1117183

U.S. Leo Services, Inc. FCC Form 493 EXHIBIT 1 TECHNICAL DATA AND ANSWERS TO FCC FORM 493 QUESTIONS

EXHIBIT 1: ANSWERS TO FCC FORM 493 QUESTIONS Responses to Questions 11—26 of FCC Form 493 (as necessary). Question 11. Points of communication These transceivers will operate in conjunction with the constellation of IRIDIUM System satellites. Question 13. Transmitting equipment a) Number of high power amplifiers (HPAs). Each unit will be equipped with an HPA supplied by one of three vendors. There are no model numbers associated with this equipment to date. The manufacturers are: Texas Instruments Raytheon Motorola Inc.. The maximum power developed by the HPA is 10 W averaged over the time slot and the maximum power delivered into the antennas after circuit losses is 7W average during a time slot. The frame timing is described in the figure below. QM me _ 2222220 D________. TINE uL1 w2 UL3 UL4 o1 o2 DL3 DL4 20.48 ms 8.28 ms Question 14. Antenna facilities 1 na designs are currently under development by Motorola and may be built by a third party manufacturer. These antennas are essentially hemispherical antennas with omni Cl cllccc—~ guUA , one antenna per radio. Antenna patterns are not precisely defined. Since the system is a TDD ( time domain duplex ) system, the receiver zd tran U > antennas will have the following general parameters. Polgsy ce ae ns be eeesre ns | Polarization Right Hand Circular Peak Ga ... <3.5dBic Elevatio= ««».— «—anve horizon coverage 8.2 to 90 degrees Azimuth angie coverage 360 degrees 1

EXHIBIT 1: ANSWERS TO FCC FORM 493 QUESTIONS Gain over coverage angles <3.5dBic Gain at 0 degrees elevation angle above <O0 dBic horizon Size < 1 inch diameter by <7 inches length Question 15. Antenna heights The antenna heights above the local ground are dictated by the radio under consideration. The portable radio antenna height will be roughly just above the head of the user and at approximately 6 ft. above ground level. Question 16. Particulars of operation a) Frequency of operation 1616 to 1626.5 MHz (See note to question 14) b) Polarization RHCP c) Emission designator aamg wor ons C., . ~, Maximum EIRP and EIRP density The maximum EIRP is determined by the maximum powerinto the antenna, the antenna gain and the time averaging due to the TDM/TDD frame structure. The antenna gain E——.~... .— __~. PT 2 it this time so the maximum EIRP limit applies to all elevation and azimuth angles (see Question 14). However, the antennas will have less gain a U d e y ee C 1. L , U ae As oc oggoee o0 en ene 22 e .22 o. _._.S generates the average interference levels. The EIRP density is defined as the EIRP divided by the noise bandwidth which is 25 kHz. 1.. o [A 2l Gain Ant dBic [EIRP dBW (EIRP dBwW/4 | kHz 1slot (bu ~ 11.95 3.99 frame 1 slot__|_______ —1.91 3.5 1.59 —6.37 |f | — 1.09 3.5 4.6 —3.36

EXHIBIT 1: ANSWERS TO FCC FORM 493 QUESTIONS £f) Modulation description The modulation is described by the following parameters: Parameter Description Multiplex Method TDMA/FDMA Duplex method Time Domain Duplex Modulation format QPSK Data rate 50 kbps Symbol rate 25 ksps Modulation Prefiltering square root raised cos filtering synthesized in the spectral domain; roll off factor = 0.4 Occupied BW per channel 31.5 kHz Channel Spacing 41.6666 kHz Question 17. Receiving system noise temperature. 2 i}z\ C e . 600. — . &,.0 4E The receiving system noise temperature is 321 degrees K. at all elevation angles and over the entire frequency range. Question 19. _..._.cl.2 cclcl2lcl cpllc2ll.. The radios are individually operated by subscribers using the transceivers and are not in gha mirintant aamana mamatn ao—~k— ol facilities. However, each transceiver is controlled by both its home gateway and the visiting gateway, which serves and manages the area the grbas—Lao— is ja Dash af thaca faifisisa ~~4 t———oh— ———<bility to allow or disallow service to any subscriber in its jurisdiction. The first U.S. gateway will be located near Ta~—~ *—izona. (mestimn —, (see Attachment 1) Guesuun 20. Loce Section G of Narrative Appuumu)n) (/u\.vul.autl ds . pazvew i rddrqudabidvadt i j

EXHIBIT 1: ANSWERS TO FCC FORM 493 QUESTIONS Additional Technical Information a. FREQUENCY STABILITY The fundamental frequency stability of the reference oscillator used in the transceivers is 1.5 ppm. b. OUT OF BAND SPURIOUS EMISSIONS The subscriber radios will adhere to all relevant regulatory standards regarding unwanted emissions established by the FCC, ITU and other government organizations, including 25.202(f) of the Rules. 1. Protection of Radio Astronomy (RAS) Section 25.213(a) of the Rules establishes protection criteria for the radio astronony service. The MSS system will be capable of determining the position of the user transceivers through radiodetermination calculations. Each subscriber radio under this license will be capable of radiodetermination through the IRIDIUM System design. The design supports both passive location determination measured on down links only and active determination through special up—link and down—link channel configurations, messaging anrl anlaalasiaaas The subscriber equipment operated under this license will be capable of transmitting in the 1616 to 1626.5 MHz band. Section 25.213(a)(1)(iii) of the Rules indicates that there are no spe lios when operating in this band for the Radio Astronomy Service. Furthermore, the NRAO (National Radio Astronomy Organization) has agreed to study th 22 e beacon C : to determine if it hasvalueinprov1dmg further protection to RAS sites. If adopted, each subscriber radio would be required to first monitor for an RAS t Cb —— <—o———— —~— —~——ess the satellite system. The subscriber radios will be designed and manufactured with the ability to utilize the beacon concept. Section 25.213(b) of the Rules mandates that out of band emissions into the 1574.397— 1576.443 MHz L2z y —— .. .___. below. These levels will be achieved in the subscriber units. E__ welce.}, itnt

EXHIBIT 1: ANSWERS TO FCC FORM 493 QUESTIONS 3. Protection of Radio Navigation{( GLONASS) Section 25.213(c) of the Rules mandates that the transceivers limit e.i.r.p. levels to no greater than —15 dB (W/4kHz) on frequencies being used by systems operating in conformance with RR 732 and —3 dB (W/4kHz) on frequencies that are not being so used." The e.i.r.p. density levels set out in response to question 16 d) & e) above indicate that the transceivers will meet these e.i.r.p. levels. The FCC has not issued any specific regulations regarding protection of GLONASS. In the RTCA special committee 159 WG6, there is an on—going study of emission levels required to protect this service. The subscriber radios will be designed to conform to any _ reasonable levels established by the FCC. 4, European Requirements The European community also does not have any current out—of—band emission standards that apply to mobile satellite terminals. However, in ETSI SES—5 on S—PCN the issue has been worked vigorously for several years and there is a current agreement within SES—5. These levels are described in terms of absolute power limits. The document that defines these levels is Draft ETS 05009, Version 1.0.0. The emission limits for frequency offsets close to the band edge are given below. Frequency Oftset Carrier on EIRP dBW Carrier on Cartier off EIRP from edge of band measurement bw ( Measurement bw= (kHz) _ kHz 100 kHz) 0 to 166 [ (avees oviks w aveyy py —77 166 to 575 | —55 |3 77 Dh a w a un a 1 us £00 £o e d 1~ €o8 2 5 6oc6 vrrmm a db d d y s sb k k a aek £o2a4 1""‘O|h\lnl £o2m%~ 10 «i3 1 n 1 (Where t is the oftset in kHz and the power measurements are averaged during the on or (\m imA \ (;A.-‘A-nll.. kae atéonka aaacng D RALIS kx klka JA LPl kA LLTL K RALbG RAWCUEC\ L asad iLha amenrmns Jm—wmia amn en conangearite sceth aaon~ ~~ceptions. A full copy of the draft E1 S U5U0UY 1s attached for reterence. The above table can be converted to ottset—from—channel—center—frequency by adding 24 1‘-1'1.... aa ala Puan.rrase slah iss aa Jasaciha aha a22 c cccfaa c o2 c uicccl Bosial{ l2 dih _2 Peanisanaae.

EXHIBIT 1: ANSWERS TO FCC FORM 493 QUESTIONS offset in order to access the close—to—carrier performance limits. These emissions are primarily due to the modulation. Frequency Offset Carrier on EIRP dBW Carrier on Carrier off EIRP from channel measurement ( Measurement bw= center (kHz) bw kHz 100 kHz) 24 to 190 —(16.25+38.75*(£—24)/166) 3 —77 190 to 599 —55 3 —77 599 to 1199 —60 3 —77 1199 to 1549 —(50+5*(£—1199)/3 50) 30 —77 >1549 —55 30 —77 The subscriber radios will meet these levels. In addition to the emissions caused by the modulation process, there are limits placed on narrow band spurious signals by ETSI. The limits can be simply described by the table below. Spurious Emissions Limits Frequency in MHz Carrier on EIRP dBW Carrier off EIRP ( Measurement bw= 100kH2) _ 0.1 to 1000 o u 1000 to 1608 —60 —77 [> — — frmn t ons ~~ | —77

EXHIBIT 1: ATTACHMENT 1 Form 493 Questions 22, 26 Nature of the Application and Services to be Provided This application is for a blanket license for portable handheld subscriber earth terminals ("transceivers") that are part of the IRIDIUM® System‘s world—wide non—geostationary mobile sateltite service (MSS). The Applicant is seeking a license to construct and operate these transceivers in the U.S. A. Consistency With MSS Spectrum Allocation and Assignment On January 31, 1995, the FCC‘s International Bureau authorized Motorola Satellite Communications, Inc. to construct, launch and operate a low—Earth orbit satellite system called the IRIDIUM System.* Specifically, Motorola was authorized to construct the IRIDIUM System over the 1616—1626.5 MHz band and to operate initially in the 1621.35—1626.5 MHz portion of the band. The system was authoriized to utilize the 23.18—23.38 GHz band for inter—satellite links. Motorola was also given conditional authority to construct, at its own risk, feeder links in the 19.4—19.6 GHz (space—to—Earth) and 29.1—29.3 GHz (Earth—to—space) bands.* The Commission explicitly stated that this authorization did not cover the MSS earth terminals or gateway earth terminals required to complete the IRIDIUM System.* In its Big LEO MSS Allocation Order of 1994, the Commission recognized that the low power requirements of MSS LEO space stations and their associated [ round units would result in a host of new communications services such as @0 1 T _ _lelephone (offering voice, data and facsimile), radiolocation and radionavigation made available at a relatively low cost.* In its subsequent Big LEO Licensing Order, the Commission adopted a blanket licensi O 1 se on ce iee en mam ie i. scoremme e ermmmentCatons, 1NG. TOt AUWNOHLY 10 Cunsu uui, Launict ariu wpelale a Low eartn uroiu satellite System in the 1616—1626.5 MHz Brjqd’ Qrrlaor and Arithnrizatinn 4N FEMM DBad N0RA 4 o0R\ Id. at [ #17 & >7 Jn 1t rval vds gp «l d . Pa Mc rvice, k ( To

would hold the authorization and be responsible for a specified number of similar transceiver units. The license term would be for ten (10) years and requests to add additional user transceivers would be treated as minor modifications. End users who wish to use the satellite system must first obtain authorization from the space station operator. Once that authorization is obtained, the end user‘s operation of a transceiver would fall under the blanket license of the service vendor.? B. The IRIDIUM System Portable Handheld Transceivers The Applicant is seeking authority to license up to 200,000 portable handheld transceivers. The transceivers will be full duplex, L—band transceivers capable of communicating with the IRIDIUM System satellites and through them with other transceivers in the system or the public switched telephone network (via the IRIDIUM System gateway earth stations). The transceivers transmit voice and data at a channel rate of 50 kilobits per second using QPSK modulation with nyquist filtering to minimize spectral occupany. The transceivers are capable of tuning in channel steps of 41.66 kHz across the 1616—1626.5 GHz range and nominally provide 11.45 dBW of effective isotropic radiated power (EIRP). Reliable reception of the downlink signal is required before the transceiver‘s transmitter is enabled. This is done via the software that controls the transceiver. The gateway earth station facility can also remotely disable transmissions from the transceivers. The transceivers can tune to any assigned channel which is defined by an FDM frequency and TDM time stlot. The transceivers will provide services such as two—way voice and data communications to other transceivers anywhere in the world and between the 1 so .I ( Jon f=m I 1=m


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Document Modified: 2015-12-03 17:09:28
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