Exhibit

0263-EX-PL-2000 Text Documents

COMSAT Corporation/COMSAT Mobile Communications

2000-12-06ELS_43231

ID : DEC 0500 11:37 No .001 P .02 FCC Form 442 Exhibit 1: CMC Page 1/3 EXLLLBIT 1 EQUJPMENT DESCRIPTION PROGRAM DESCRIPTION Comsat Mobile Communications (CMC) will be operating one fixed Satcom pallet equipped with Honeywell Electronics Avionics at their INMARSAT ground earth station at Santa Paula, CA. The equipment will be operated for the purpose of, a) Test and demonstrate operation of an INMARSAT aircraft earth station (AES) with terrestrial public switched telephone and data systems (PSTN and PSIDN) inter{aces for voice/data/fax applications. b) Provide capability to monitor vendor changes, training capability for the commissioning and Maintenance Terminal (CMT), monitoring ofLand Earth Station (LES)/AES interface and confirm AES preference programming specifications. The equipment shall opcrate in the Marine and Acronautical Mobile Satceilite band of frequencies. Demonstration of the operational capability of this equipment requires transmitting. No "FOR JJIRE" communications are to be provided during any use of this equipment. DIGITAL VOICE AND DATA The equipment shall transmit on channel of digital voice or high speed data using 21 Kb/sec (10.5) A—QPSK modulation. The system shall use a high gain stationary helix test antenna, In addition, low speed data will be transmitted using an A—BPSK modulation, All modulation complies with aviation standards, Ground communication services shall be provided by CMC and other INMARSAT land earth station operators (LESOs) as required. OPERATING DETAILS The bands comprising 1626.5 to 1660,.5 MHz will be used. Specific frequencies and operating schedules will be coordinated with Inmarsat, in cooperation with CMC and other INMARSAT LESOs. RF Power Output The maximum RF power output of the equipment will be 60 Watts per carrier (17.8 dBW peak).

ID: DEC O5 °00 11:38 No .001 P .03 FCC Form 442 Exhibit 1: CMC Page 2/3 Antenna Gwain A high gain helix antenna shall be used to provide a gain of 12 dBic and half power beam width of 28 degrees. EIRP The maximum equivalent isotropic radiated power (KIRP) shall be 27.6 dBW (peak) {17.8 19.8). Emission Types Rate 1/2 !mission Modulation Symbol Convolutionally Type Type Rate Encoded Rate 840HGID A—BPSK 600 baud (600 b/sec) 1K68GID A—BPSK 1200 baud (1200 b/sec) 3K36GID A—BPSK 2400 baud (2400 b/sec) 4K80G)L) A—QPSK 2400 baud (4800 b/sec) 6K72GIW A—QPSK 4.2 kbaud {(8400 b/sec) 10KSGID A—QPSK 5.25 kbaud {(10.5 kb/sec) 21KOGIW A—QPSK 10.5 kbaud (21.0 kb/sec) Modulation Methods Type Description A—QPSK Aviation Quadrature Phase Shift Keying uses a specific form of Offset QPSK where the modulationfiltering is optimized for satellite communications with aviation applications (Reference: "Quaternary Transmission Over Satellite Channels with Cascaded Non—Linear Elements and Adjacent Channel Interference" by Russel Fang in TIEEE Transactions on Communications, May 1981, Vol. COM—29, No. 5, pp. 567—581.} A—BPSK Aviation Binary Phase Shift Keying uses a specific form of differentially encoded BPSK where in—phase and quadrature channels are usedto transmit alternate symbols. (Referenced: "Differential Detection With Intersymbol Interference and Frequency Uncertainty" by J.H. Wintore in 1EEE Transactions on Communications, January 1984, Vol. Comin— 32, No. 1, pp. 25—33.)

ID : DEC 0500 11:38 No .001 P .04 FCC Form 442 Exhibit 1: CMC Page 3/3 NECESSARY BANDWIDT!HL Radiated bandwidth from the equipment is controlled by the use of raised cosine filters in the transmitter. ‘The A—QPSK are signals subjected to either a 60% or 100% raised cosine filter. A 40% raised cosine filter is used for the A—l3PSK signals. The associated necessary bandwidth calculation is: BW=—L/T (1+1) Where 1/7T is the symbel transmission rate in symbols per second and r is the roiloff factor. Symbol Rate Modulation Rolloff Bandwidth (Baud) _ Type Lr (BWw) 600 A—BPSK 0.4 0.840 KHz 1200 A—BPSK 0.4 1.680 KHz 2400 A—BPSK 0.4 3.300 Kl1z 2400 A—QPSK 1.0 4.800 KHz 4200 A—QPSK 0.6 6.720 KHz 5250 A—QPSK 1.0 10.5 KHz 10. 5k A—QPSK 1.0 21.00 K1z


Document Created: 2000-12-06 09:36:03
Document Modified: 2000-12-06 09:36:03
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